DIN 17175 Seamless Steel Tubes

DIN 17175-79 Seamless Steel Tubes For Elevated Temperatures
 
 
Standard
DIN 17175 - German Industrial Standard
DIN: Deutsche Industrie Normen
 
DIN 17175 (boiler tubes made of heat-resisting steel).
DIN 17175 seamless steel pipes are used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices.
 
DIN 17175 seamless boiler pipe can also be used as heating surface pipe, economizer, superheater, reheater and petrochemical industrial pipe for high-pressure boilers (The working pressure is above hunting for.8 Mpa in general and the working temperature is between 450℃ to 650℃. ).


The same effective standards and reference materials
DIN 2391, part 1 , cold drawn or cold rolled precision seamless steel: size.
DIN 2413, Steel tube: Wall thickness resistance to internal pressure.
DIN 2448, seamless steel pipe: size and weight.
DIN 2915, seamless and welded steel tubes for water tube boilers.
DIN 2917 , Non-stitched steel tubes for hot steam pipes and headers : Dimensions
DIN 17007 Part 2
DIN 50049, material test certificate
DIN 50115, Metal Materials Experiment: Notch Impact Toughness Test
DIN 50125, Metallic Materials Experiment: Tensile Test, Preparation Principles
DIN 50136, Metallic Materials Experiment: Ring-shaped flattening test of pipe
DIN 50137, steel test: ring flaring test of pipe
DIN 50138, steel test: ring tensile test of pipe
DIN 50140, Metallic Materials Test: Tube and Tube Tension Tests for Incompetent Adjustability Meters
DIN 50145, Metal Materials Experiment: Tensile Test
 
 
 
Concept
As far as this standard is concerned, steels that have a good mechanical properties at a higher temperature, up to 6 00 °C, and even under long-term load, are called heat-strength steels.
 
 
Marking and ordering
The steel grade or material number should be written to the abbreviation of the product as shown in the following example:
Example 1:
A DIN 17175 outer diameter 3 8mm, wall thickness 2.5 mm mm steel grade ST35.8 material, number 1.03 0 5 seamless steel pipe whose name is written: steel pipe DIN 17175-ST35.8 - 38 × 2.5 or steel pipe DIN 17175 -1.0305 - 3 8 × 2.5
 
When ordering goods, except for the above-mentioned requirements, the total length required and the required acceptance test certificate should be stated. If it is a non-incorporated steel pipe, the quality level should be stated.
 
 
Requirements
Production method
The steel pipe to which this standard relates may be produced by hot rolling, cold rolling, hot pressing, hot drawing or cold drawing.
The tube steel can be smelted in a flat furnace or an electric furnace according to the oxygen blowing method, and all steels should be cast in a static manner.
 
 
Process performance
The tube should meet the requirements of the ring test. For the expansion rate (diameter change) of the ring-shaped flaring experiment, no impermissible defects (such as cracks, crepe, folding, and delamination) shall occur during the test.
 
 
 
Main steel grades
St35.8, St45.8, 15mo3, 13CrMo44, 10CrMo910 and the like.
After consultation, but also supply other brands of steel pipe.
 
 
 
Dimensions Tolerance of DIN 17175
 
 

Project	Standard		Size range		Tolerance
Outer diameter	DIN17175		Hot rolled steel pipe	OD ≤ 100mm	± 0.75%( Min ± 0.5mm )
				OD＞ 100~ 320mm	± 0.9%
			Cold drawn steel pipe OD ≤ 120mm		± 0.6%( Min ± 0.25mm )
Wall thickness	DIN17175	OD ≤ 130mm	WT ≤ 2Sn		+15%~-10%
			WT ＞ 2Sn~4Sn		+12.5%~-10%
			WT ＞ 4Sn		± 9%
		130 ＜ OD ≤ 320mm	WT ≤ 0.05OD		+17.5%~-12.5%
			0.05OD ＜ WT ≤ 0.11OD		± 12.5%
			WT ＞ 0.11OD		± 10%

 
 
 
 
DIN 17175 St35.8 seamless steel pipe Chemical Composition
 

Standard	grade	Chemical composition
		C	Si	Mn	P、S	Cr	Mo
DIN 17175	St35.8	≤0.17	0.10-0.35	0.40-0.80	≤0.030	/	/
	St45.8	≤0.21	0.10-0.35	0.40-1.20	≤0.030	/	/
	15mo3	0.12-0.20	0.10-0.35	0.40-0.80	≤0.030	/	0.25-0.35
	13CrMo44	0.10-0.18	0.10-0.35	0.40-0.70	≤0.030	0.70-1.10	0.45-0.65
	10CrMo910	0.08-0.15	≤0.50	0.40-0.70	≤0.030	2.00-2.50	0.90-1.20

 

DIN 17175 St35.8 seamless steel pipe Mechanical property(%)
 

Standard	grade	Tensile Strength(MPa)	Yield Strength(MPa)	Elongation(%)
DIN 17175	St35.8	360-480	≥235	≥25
	St45.8	410-530	≥255	≥21
	15mo3	450-600	≥270	≥20
	13CrMo44	440-590	≥290	≥20
	10CrMo910	450-600	≥280	≥18

Supply status
The full length of the steel pipe shall be delivered through a suitable heat treatment. According to each steel type, heat treatment includes:
- normal fire
- Retirement
- tempering; from the quenching temperature, it is not cold, but then tempered
as well as
- Adjust the mass by the isothermal transformation method.
If a satisfactory uniform crystal structure is produced after hot work, the appropriate heat treatment for St35.8, St45.8, 17Mn4, 19Mn5, and 15 Mn3 steels is considered to have been met. Under the same premise, the 13CrMo44 and 10CrMo910 steels will be tempered to replace the complete quenching and tempering treatment. In any case, 14MoV63 and 20XcrMoV121 steels are supplied after tempering treatment.
 
 

HR:hot rolled	CW:cold worked	SR:stress relieved
A:annealed	N:normalized	HF

Surface condition
The tube must have a manufacturing method that achieves a relatively smooth inner and outer surface, so that it is possible to use either a hot rolling method or a cold rolling method. Tubes should not have unacceptable cracks, creases and folds. As long as the wall thickness of the steel pipe does not exceed the allowable dimensional deviation, and does not affect the performance of the steel pipe, it is permissible to create some uneven and shallow longitudinal scratches during the manufacturing process. Mechanical machining (such as buffing) can be used to remove the slight subsidence of the surface, but not to reduce the minimum allowable wall thickness.


Heat treatment and processing
Reference data for heat treatment temperature
Hot working is possible from 1100 to 80 ° °C, and the temperature can be reduced to 750 °C during processing.
In the matching-correction work of the local department, attention should be paid to the effective specification of hot work; there should be a supervisory temperature system. In the higher temperature range, ie 1100 to 900 °C, it is suitable for forging and pier thickening, about 85 °C, and the temperature can be lowered to above 75 °C during the processing.
For example, before the last process, or during the same hot working process, if the heating temperature of the workpiece is above the normalizing temperature but not more than 1000 ° C, and the deformation process is above 75 ° C, or ———— In the last process, the degree of deformation does not exceed 5% - at the end of 7 00 °C, then the normalizing of the St35.8, St45.8, 17Mn4, 19Mn5, and 15Mo3 steels is superfluous. The 13CrMo44 and 10CrMo910 only need to be tempered.
For multiple times and/or long time heat treatments at temperatures around 1000 to 1000 °C, the workpiece should be cooled to around 350 °C before the last deformation process. If the normalizing or quenching and tempering treatment is more than enough, then the temperature at which the steel is hot-worked should not exceed 1 000 °C.
Conversely, if the molding end temperature is above 10 °C, then the St35.8, St45.8, 17Mn4, 19Mn5, and 15Mo3 steels must be normalized, while the 13CrMo44 and 10CrMo910 should be tempered.
14MoV63 and X20CrMoV121 steels should be reconditioned after hot work.
 
Pipes made of steel according to this standard may be cold-worked, such as pipe bending, flaring, drawing and pipe cutting; for X20CrMoV121 and 14CrV63 steels, the high yield point and tensile strength shall be noted. After bending, expanding, and cold drawing with normal deformation, there is no need to supplement the heat treatment.
 
 
Original material test
A thin sheet should be taken at the top end of each round or square bar ingot for a pickling test to determine if the top end is adequately cut. Ultrasonic testing can also be performed on the shrinkage hole as selected by the supplier.
 
 
Test:
Chemical composition verification test
hydrostatic test
Tensile test
Notched impact test
Yield strength test
Ring test
Nondestructive testing
 
 
Tube flag
All steel pipes submitted for testing and acceptance shall be marked on the left and right sides of the pipe end at 300 mm. The mark is usually a number. Thin-walled tubes can also be used in other forms.
 
 
 
   

Steel grade		C		Si		Mn		P	S
Steel name	Steel number	min.	max.	min.	max.	min.	max.	max.	max.
C22E	1 .1 1 51	0,1 7	0,24	-	0,40	0,40	0,70	0,035	0,035
C35E	1 .1 1 81	0,32	0,39	-	0,40	0,50	0,80	0,035	0,035
C45E	1 .1 1 91	0,42	0,50	-	0,40	0,50	0,80	0,035	0,035
C60E	1 .1 221	0,57	0,65	-	0,40	0,60	0,90	0,035	0,035
38Mn6	1 .1 1 27	0,34	0,42	0,1 5	0,35	1 ,40	1 ,65	0,035	0,035
a  See also 7.1. b  C r max. 0,40%, Mo max. 0,1 0%, Ni max 0,40%, Cr + Mo + Ni max. 0,63%.

 
 
 
Table 6 — Chemical composition (cast analysis) for tubes made from alloy special steels in % by mass a
 

Steel grade		C		Si	Mn		P	S	Cr		Mo		Ni
Steel name	Steel number	min.	max.	max.	min.	max.	max.	max.	min.	max.	min.	max.	min.	max.
41 Cr4	1 .7035	0,38	0,45	0,40	0,60	0,90	0,035	0,035	0,90	1 ,20	-	-	-	-
25CrMo4	1 .721 8	0,22	0,29	0,40	0,60	0,90	0,035	0,035	0,90	1 ,20	0,1 5	0,30	-	-
30CrMo4	1 .721 6	0,27	0,34	0,35	0,35	0,60	0,035	0,035	0,80	1 ,1 5	0,1 5	0,30	-	-
34CrMo4	1 .7220	0,30	0,37	0,40	0,60	0,90	0,035	0,035	0,90	1 ,20	0,1 5	0,30	-	-
42CrMo4	1 .7225	0,38	0,45	0,40	0,60	0,90	0,035	0,035	0,90	1 ,20	0,1 5	0,30	-	-
36CrNiMo4	1 .651 1	0,32	0,40	0,40	0,50	0,80	0,035	0,035	0,90	1 ,20	0,1 5	0,30	0,90	1 ,20
30CrNiMo8	1 .6580	0,26	0,34	0,40	0,30	0,60	0,035	0,035	1 ,80	2,20	0,30	0,50	1 ,80	2,20
41 NiCrMo7-3-2 b	1 .6563	0,38	0,44	0,30	0,60	0,90	0,025	0,025	0,70	0,90	0,1 5	0,30	1 ,65	2,00
a   See also 7.1. b   ≤ 0,25% Cu.

 
 
 
Table 7 — Permissible deviations of the product analysis from the specified limits on cast analysis
 

Element	Limiting values for the specified analysis % by mass	Permissible deviation on the product analysis % by mass
C	≤ 0,55	± 0,02
	> 0,55 ≤ 0,65	± 0,03
Si	≤ 0,60	± 0,05
Mn	≤ 1 ,70	- 0,05 / + 0,1 0
P	≤ 0,035	+ 0,005
S	≤ 0,040	+ 0,005
Cr	≤ 2,00	± 0,05
	> 2,00 ≤ 2,20	± 0,1 0
Mo	≤ 0,30	± 0,03
	> 0,30 ≤ 0,50	± 0,04
Ni	≤ 2,00	± 0,05
	> 2,00 ≤ 2,20	± 0,07
Al total	≥ 0,01 0	- 0,005
Cu	≤ 0,35	+ 0,04
	> 0,35 ≤ 0,70	+ 0,07
N	≤ 0,025	+ 0,002
Nb	≤ 0,07	+ 0,01
Ti	≤ 0,050	+ 0,01
V	≤ 0,20	± 0,02

 
 
8.3 Mechanical properties
8.3.1 For tubes made of steels covered by Tables 3, 4, 5, and 6 the mechanical properties for the relevant delivery condition in Tables 8, 9, 1 0,1 1 and 1 2 apply.
8.3.2 When specified, for tubes supplied as rolled or annealed in grades of Table 5 the mechanical properties in Table 1 0 shall apply for a sample submitted to a simulated normalizing treatment (see Option 2).
Option 2 A tensile test shall be carried out on a sample test piece from a sample heat treated to the condition +N and the results reported.
8.3.3 When specified, for tubes supplied normalized in grades of Table 5 and for tubes supplied as rolled or annealed in grades of Table 5 and 6 the mechanical properties in Table 1 2 shall apply for a sample submitted to a simulated quenched and tempered treatment (see Option 3).
Option 3 A tensile test shall be carried out on a sample test piece from a sample heat treated to the condition +QT and the results reported.
8.3.4 When specified for tubes supplied annealed in grades of Tables 5, 6, and Table A.1 or for tubes supplied in delivery condition +N, +TH or +FP in grades of Table A1 a tensile test shall be carried out and the results reported (see Option 4).
Option 4 A tensile test shall be carried out and the results reported.
8.3.5 When specified for tubes supplied quenched and tempered in grades of Table 5 or 6 except C60E the impact properties, shown in Table 1 3 shall apply (see Option 5).
Option 5 The impact energy values of Table 1 3 shall be verified and the results reported.
 
 
Table 8 — Mechanical properties for tubes made of steels in accordance with Table 3
 

Steel grade		Delivery condition	Minimum tensile properties
Steel name	Steel number		Yield strength (R eH ) Mpa  b					Tensile strength (R m ) MPa				Elongation A %
			For T in mm					For T in mm				l	t
			≤ 1 6	> 1 6 ≤ 40	> 40 ≤ 65	> 65 ≤ 80	> 80 ≤ 1 00	≤ 1 6	> 1 6 ≤ 40	> 40 ≤ 65	> 65 ≤ 1 00
E 235	1 .0308	+AR or a +N	235	225	21 5	205	1 95	360	360	360	340	25	23
E275	1 .0225	+AR or a +N	275	265	255	245	235	41 0	41 0	41 0	380	22	20
E31 5	1 .0236	+AR or a +N	31 5	305	295	280	270	450	450	450	420	21	19
E355	1 .0580	+AR or a +N	355	345	335	31 5	295	490	490	490	470	20	18
E470	1 .0536	+AR	470	430	-	-	-	650	600	-	-	17	15
NOTE l = longitudinal, t = transverse.
a   At the manufacturers discretion as rolled or normalized. b   1 MPa = 1 N/mm 2 .

 
 
 
Table 9 — Mechanical properties for tubes made of steels in accordance with Table 4
 
 

Steel grade		Delivery condition	Minimum tensile properties											Impact properties
Steel name	Steel number		Yield strength (R eH ) MPa					Tensile strength (R m ) MPa				Elongation A %		Minimum average absorbed energy, KV min., J at a test temperature of – 20 °C
			For T in mm					For T in mm				l	t	l	t
			≤ 1 6	> 1 6 ≤ 40	> 40 ≤ 65	> 65 ≤ 80	> 80 ≤ 1 00	≤ 1 6	> 1 6 ≤ 40	> 40 ≤ 65	> 65 ≤ 1 00
E275K2	1 .0456	+N	275	265	255	245	235	41 0	41 0	41 0	380	22	20	40	27
E355K2	1 .0920	+N	355	345	335	31 5	295	490	490	470	470	20	18	40	27
E420J2	1 .0599	+N	420	400	390	370	360	600	560	530	500	19	17	27	20
E460K2	1 .8891	+N	460	440	430	41 0	390	550	550	550	520	19	17	40	27
E590K2	1 .0644	+QT	590	540	480	455	420	700	650	570	520	16	14	40	27
E730K2	1 .8893	+QT	730	670	620	580	540	790	750	700	680	15	13	40	27
NOTE l = longitudinal, t = transverse.

 
 
Table 10 — Mechanical properties for tubes made of steels in accordance with Table 5 in delivery condition +N
 

Steel grade		Minimum tensile properties
Steel name	Steel number	Yield strength ( R eH ) MPa			Tensile strength ( R m ) MPa			Elongation A %
		For T in mm			For T in mm			For T in mm
		≤ 1 6	> 1 6 ≤ 40	> 40 ≤ 80	≤ 1 6	> 1 6 ≤ 40	> 40 ≤ 80	≤ 1 6		> 1 6 ≤ 40		> 40 ≤ 80
								l	t	l	t	l	t
C22E	1 .1 1 51	240	21 0	21 0	430	41 0	41 0	24	22	25	23	25	23
C35E	1 .1 1 81	300	270	270	550	520	520	18	1 6	19	17	19	17
C45E	1 .1 1 91	340	305	305	620	580	580	14	1 2	16	14	16	14
C60E	1 .1 221	390	350	340	71 0	670	670	10	8	1 1	9	1 1	9
38 Mn 6	1 .1 1 27	400	380	360	670	620	570	14	12	15	13	16	14
NOTE l = longitudinal, t = transverse.

 
 
 
Table 11 — Mechanical properties for tubes made of steels in accordance with Table 5 in delivery condition +QT
 

Steel grade		Minimum tensile properties
Steel name	Steel number	Yield strength (R eH ) MPa				Tensile strength (R m ) MPa				Elongation A %
		For T in mm				For T in mm				For T in mm
		≤ 8	> 8 ≤ 20	> 20 ≤ 50	> 50 ≤ 80	≤ 8	> 8 ≤ 20	> 20 ≤ 50	> 50 ≤ 80	≤ 8		> 8 ≤ 20		> 20 ≤ 50		> 50 ≤ 80
										l	t	l	t	l	t	l	t
C22E	1 .1 1 51	340	290	270	260	500	470	440	420	20	18	22	20	22	20	22	20
C35E	1 .1 1 81	430	380	320	290	630	600	550	500	17	15	19	17	20	18	20	18
C45E	1 .1 1 91	490	430	370	340	700	650	630	600	14	12	16	14	17	15	17	15
C60E	1 .1 221	580	520	450	420	850	800	750	71 0	11	9	13	11	14	12	14	12
38Mn 6	1 .1 1 27	620	570	470	400	850	750	650	550	13	11	14	12	15	13	16	14
NOTE l = longitudinal, t = transverse.

 

Table 12 — Mechanical properties for tubes made of steels in accordance with Table 6 in delivery condition +QT
 

Steel grade		Minimum tensile properties
Steel name	Steel number	Yield strength (R eH ) MPa				Tensile strength (R m ) MPa				Elongation A %
		For T in mm				For T in mm				For T in mm
		≤ 8	> 8 ≤ 20	> 20 ≤ 50	> 50 ≤ 80	≤ 8	> 8 ≤ 20	> 20 ≤ 50	> 50 ≤ 80	≤ 8		> 8 ≤ 20		> 20 ≤ 50		> 50 ≤ 80
										l	t	l	t	l	t	l	t
41 Cr 4	1 .7035	800	660	560	-	1 000	900	800	-	11	9	12	10	14	12	-	-
25 Cr Mo 4	1 .721 8	700	600	450	400	900	800	700	650	12	10	14	12	15	13	16	14
30 Cr Mo 4	1 .721 6	750	630	520	480	950	850	750	700	12	10	13	11	14	12	15	13
34 Cr Mo 4	1 .7220	800	650	550	500	1 000	900	800	750	11	9	12	10	14	12	15	13
42 Cr Mo 4	1 .7225	900	750	650	550	1 1 00	1 000	900	800	10	8	11	9	12	10	13	11
36 Cr Ni Mo 4	1 .651 1	900	800	700	600	1 1 00	1 000	900	800	10	8	11	9	12	10	13	11
30 Cr Ni Mo 8	1 .6580	1 050	1 050	900	800	1 250	1 250	1 1 00	1 000	9	7	9	7	10	8	11	9
41 Ni Cr Mo 7-3-2	1 .6563	950	870	800	750	1 1 50	1 050	1 000	900	9	7	10	8	11	9	12	10
NOTE l = longitudinal, t = transverse.

 
 
 
Table 13 — Impact properties a for tubes made of steels, in accordance with Tables 5 and 6 in delivery condition +QT
 

Steel grade		Minimum average absorbed energy KVmin, J, at a test temperature of 20 °C
Steel name	Steel number	T ≤ 8	8 < T ≤ 20		20 < T ≤ 60		60 < T ≤ 1 00
		l	l	t	l	t	l	t
C22E	1 .1 1 51	50	50	32	40	27	40	27
C35E	1 .1 1 81	35	35	22	35	22	35	22
C45E	1 .1 1 91	25	25	1 4	25	14	25	1 4
38Mn6	1 .1 1 27	36	40	25	40	25	-	-
41 Cr4	1 .7035	30	35	22	35	22	-	-
25CrMo4	1 .7218	45	50	32	50	32	45	27
30CrMo4	1 .7216	40	45	27	45	27	45	27
34CrMo4	1 .7220	35	40	25	45	27	45	27
42CrMo4	1 .7225	30	35	22	35	22	35	22
36CrNiMo4	1 .6511	35	40	25	45	27	45	27
30CrNiMo8	1 .6580	30	30	20	35	22	45	27
41 NiCrMo7-3-2	1 .6563	35	40	25	45	27	45	27
NOTE l = longitudinal, t = transverse. a only applicable when option 5 is specified (see 8.3.5).

 
 
 
8.4 Hardness requirements
8.4.1 For tubes made of steel grades in Tables 5, 6 and Table A.1 and supplied in the annealed condition and for tube made of steel grades in Table A.1 and supplied in the +TH or +FP condition the hardness requirements in Table C.1 apply.
8.4.2 When Option 6 is specified, for grades of Table 5 and 6 in +QT condition, an agreed hardness range shall apply.
Option 6 An agreed hardness range shall apply and be verified and the results reported (see 1 1 .4).
8.4.3 When Option 7 is specified, for steel grades of Table A1 in +N condition, a hardness test shall be carried out and the results reported.
Option 7 A hardness test shall be carried out and the results reported.
8.5 Hardenability
When Option 8 is specified for steel grades in Tables 5, 6 and for the alloy special steels in Table A.1 , the hardenability requirements in Annex D shall apply, except for the +QT condition.
Option 8 Hardenability requirements of Annex D shall apply.
When Option 9 or Option 1 0 is specified the hardenability shall be verified.
 
 
Table 14 — Preferred dimensions of seamless steel tubes
 
Dimensions in mm

D Outside diameter	T Wall thickness
	2,3	2,6	2,9	3,2	3,6	4	4,5	5	5,4	5,6	6,3	7,1	8	8,8	1 0	1 1	1 2,5	1 4,2	1 6	1 7,5	20	22,2	25	28	30	32	36	40	45	50	55	60	65	70	80	90	1 00	D
26,9
33,7
35
38
40
42,4
44,5
48,3
51
54
57
60,3
63,5
70
73
76,1
82,5
88,9
1 01 ,6
1 08
1 1 4,3
121
1 27
1 33
1 39,7
1 41 ,3
1 52,4
159
1 68,3
1 77,8
1 93,7
203
21 9,1
229
244,5
273
298,5
323,9
355,6
368
406,4
41 9
457
508
521
559
61 0

 
 
 
Table 15 — Tolerances on outside diameter and on thickness
 
 

Outside diameter D mm	Tolerances on D	Tolerances on T for a T/D ratio
		≤ 0,025	> 0,025 ≤ 0,050	> 0,050
D ≤ 21 9,1	±1 % or ± 0,5 mm whichever is the greater	± 1 2,5% or ± 0,4 mm whichever is the greater
D > 21 9,1	±1 %	±20%	±1 5%	±1 2,5%

 
8.9.3.2 Tolerances on exact length
The limit deviations shall be as given in Table 1 6.
 
Table 16 — Tolerances on Exact Lengths
Dimensions in mm
 

Length L mm	Tolerance mm
≤ 6 000	+1 0 0
6 000 < L ≤ 1 2 000	+1 5 0
> 1 2 000	0/+ by agreement

 
 
8.9.4 Sectional properties
The nominal sectional properties shall be calculated in accordance with Annex E.
 
 
9 Inspection
9.1 Types of inspection
The conformity to the requirements of the order for tubes supplied in accordance with this Part of this European Standard shall be checked by:
 non-specific inspection and testing (see EN 1 0021 ) for tubes made of steels available in Table 3 except grade E470, unless Option 1 4 is specified ;
Option 14 Tubes made of steels in accordance with Table 3 shall be supplied with specific inspection and testing.
 specific inspection and testing (see EN 1 0021 ) for tubes made of steel grade E470 and steels in accordance with Tables 4, 5, 6 and Table A.1 .
9.2 Inspection documents
9.2.1 Types of inspection documents
The following inspection documents, in accordance with EN 1 0204, shall be issued :
 certificate of compliance with order 2.1 for tubes supplied with non-specific inspection and testing unless Option 1 5 is specified ;
Option 15 Inspection document type 2.2 shall be supplied.
 inspection certificate 3.1 .B, for tubes supplied with specific inspection and testing unless Option 1 6 is specified.
Option 16 Inspection document 3.1 .A, 3.1 .C or 3.2 shall be supplied, the type of document to be specified by the purchaser.
If an inspection document 3.1 .A, 3.1 .C or 3.2 is specified the purchaser shall notify the manufacturer of the name and address of the organisation or person who is to carry out the inspection and produce the inspection document.
In the case of inspection report 3.2 it shall be agreed which party issue the certificate.
9.2.2 Content of inspection documents
The content of the inspection document shall be in accordance with prEN 1 01 68 as shown in 9.2.2.1 , 9.2.2.2 and 9.2.2.3.
9.2.2.1 For tubes supplied with non-specified inspection and testing the certificate of compliance with the order shall contain the following codes and information:
A   commercial transactions and parties involved;
B   description of products to which the inspection document applies;
Z   validation.
9.2.2.2 For tubes supplied with non-specific inspection and testing and a test report type 2.2 it shall contain the following codes and information :
A   commercial transactions and parties involved;
B   description of products to which the inspection document applies;
C02   direction of test pieces;
C1 0 to C1 3  tensile test;
C71 to C92  chemical composition;
D01  marking and identification, surface appearance, shape and dimensional properties;
Z  validation.
9.2.2.3 For tubes supplied with specific inspection and testing the inspection documents 3.1 .A, 3.1 .B, 3.1 .C,3.2 shall contain the following codes and information :
A  commercial transactions and parties involved ;
B  description of products to which the inspection document applies ;
C02 to C03  direction of test pieces and test temperature where applicable ;
C1 0 to C1 3  tensile test, if applicable ;
C40 to C43  impact test, if applicable ;
C60 to C69  other tests (e.g. options invoked which require test pieces) ;
C71 to C92  chemical composition ;
D01  marking and identification, surface appearance, shape and dimensional properties ;
D02 to D99  for other tests (e.g. options invoked which do not require test (pieces) ;
Z  validation.
9.3 Summary of inspection and testing
Inspection and testing shall be carried out as stated in Table 1 7.
 
 
Table 17 — Summary of inspection and testing
 

Type of inspection and testing		Non-specific inspection and testing	Specific inspection and testing	Reference paragraph
Mandatory	Cast Analysis	Manufacturers procedure	1 /cast	8.2
	Tensile test a	Manufacturers procedure	1 /test unit	8.3, 1 1 .1
	Impact test b	Not applicable	1 set/test unit	8.3, 1 1 .2
	Dimensional inspection	See 1 1 .7
	Visual examination	See 1 1 .8
	Material identification of alloy steel tubes	Not applicable	Individual	1 1 .9
Optional	Tensile test on heat treated sample c	Not applicable	1 /cast	8.3.2, 8.3.3
	Tensile test d	Not applicable	1 /test unit	8.3.4, 1 1 .1
	Impact test e	Not applicable	1 set/test unit	8.3.5, 1 1 .2
	Verification of hardness range	Not applicable	According to documented procedure	8.4.2
	Hardness test	Not applicable	1 /test unit	8.4.3, 1 1 .4
	Hardenability test	Not applicable	1 /cast	8.5, 1 1 .3
	Non-destructive test for imperfections	Not applicable	individual	8.6.2, 1 1 .6
	Leak tightness test	Not applicable	individual	8.6.2, 1 1 .5
a   tensile test is not mandatory for steel grades of tables 5 and 6 in the delivery conditions +A and +AR and for steel grades of Table A.1 (see table 2) b   Only for steel grades J2 and K2 in Table 4. c   See Options 2 and 3 and 4 in 8.3. d   See Option 4 in 8.3. e   Only for steel grades under the delivery conditions +QT shown in Table 1 3.

 
 
10 Sampling
10.1 Frequency of tests
10.1.1 Test Unit
In the case of specific inspection a test unit shall comprise tubes of the same steel grade the same specified dimensions, the same cast, the same manufacturing process and the same delivery condition.
The quantity of tubes per test unit shall conform to Table 1 8.
 
10.1.2 Number of sample tubes per test unit
One sample tube shall be taken from each test unit.
Table 18 — Quantity of tubes per test unit
 

Outside diameter (D)mm	Maximum number of tubes per test unit
D ≤ 1 1 4,3	400
1 1 4,3 < D ≤ 323,9	200
D > 323,9	100

 
 
10.2 Preparation of samples and test pieces
10.2.1 General
Samples and test pieces shall be taken at the tube ends and in accordance with the requirements of EN ISO 377.
10.2.2 Test piece for the tensile test
The test piece shall be taken in accordance with the requirements of EN 1 0002-1 .
 For tubes with D less than or equal to 21 9,1 mm, the test piece shall be either a full tube section or a strip section and be taken in a direction longitudinal to the axis of the tube;
 For tubes with D greater than 21 9,1 the test piece is either a machined test piece of circular cross-section from an unflattened sample or a flattened strip section, and shall be taken in a direction either longitudinal or transverse to the axis of the tube.
10.2.3 Test piece for the impact test
The direction of testing is at the discretion of the manufacturer. Flattening of samples is not permitted. Three standard Charpy V-notch test pieces in accordance with EN 1 0045-1 shall be taken. If the nominal product thickness is such that standard test pieces cannot be produced, the test shall be carried out using test pieces of width less than 1 0 mm but not less than 5 mm. In all cases, the largest obtainable width shall be used.
Tubes shall not be subject to impact testing where longitudinal test pieces of width 5 mm or greater cannot be obtained.
Test pieces shall be taken and prepared such that the axis of the notch is perpendicular to the surface of the tube.
10.2.4 Test piece for hardenability test (Jominy)
Test pieces shall be prepared in accordance with EN ISO 642.
When a test piece from a thick wall sample tube is used (see Option 1 7) the axis of the test piece shall be located at a distance of not more than 20 mm from the outside surface.
10.2.5 Test piece for hardness test (Brinell)
Test pieces shall be prepared in accordance with EN ISO 6506-1 .
 
11 Test methods
11.1 Tensile test
The test shall be carried out at room temperature in accordance with EN 1 0002-1 and the following determined:
 the tensile strength (R m );
 the upper yield strength (R eH );
If a yield phenomenon is not present the 0,2 % proof strength (R p 0,2 ) or the 0,5 % proof strength, total extension (R t 0,5 ) shall be determined. In case of dispute the 0,2% proof strength (R p 0,2 ) shall apply.
 the percentage elongation after fracture with reference to a gauge length of 5,65√S o .
If a non-proportional test piece is used, the percentage elongation value shall be converted to the value for a gauge length L o = 5,65√ S o using the conversion Tables given in EN ISO 2566-1 .
11.2 Impact test
11.2.1 The test shall be carried out in accordance with EN 1 0045-1 . The test temperature shall be - 20°C for mandatory tests and 20 °C for optional tests (see Table 1 7).
11.2.2 The mean value of the three test pieces shall meet the specified minimum average value given in Tables 9 and 1 3. One individual value may be below the specified value, provided that it is not less than 70 % of that value.
11.2.3 If the width (W) of the test piece is less than 1 0 mm, the measured impact energy (KV p ) shall be converted to impact energy (KV c ) using the following equation.
 
 


where
KV c is the calculated impact energy, in joules;
KV p is the measured impact energy in joules;
W is the width of the test piece in millimetres.
 
The calculated impact energy KV c shall conform to the requirements given in 1 1 .2.2.
11.2.4 If the requirements of 1 1 .2.2 are not met, then an additional set of three test pieces may be taken at the discretion of the manufacturer from the same sample and tested. To consider the test unit as conforming , after testing the second set, the following conditions shall be satisfied simultaneously:
 the average value of six tests shall be equal to or greater than the specified minimum value;
 not more than two of six individual values may be lower than the specified minimum value;
 not more than one of the six individual values may be lower than 70 % of the specified value.
11.2.5 The dimensions in millimetres of test pieces, the measured energy values and the average value shall be reported.
 
 
11.3 Hardenability test
The test shall be carried out in accordance with EN ISO 642 and EN ISO 6508-1 :1 999 scale C. The test results reported by the steel producer shall apply unless Option 1 7 is specified for tubes with wall thickness equal or greater than 35 mm.
Option 17 A hardenability test shall be performed on a test piece taken from a sample tube.
11.4 Hardness test
The test shall be carried out in accordance with EN ISO 6506-1 , and HB 1 0/3 000 be determined.
Except for Option 6 (see 8.4.2), where a documented procedure shall be applied, two hardness indentations shall be made and the average shall constitute the test result.
The indentations shall be :
 on either the adequately prepared outside surface at one end of the sample tube;
 or on any appropriate surface of a sample from the test unit intentionally taken or available from tests.
It is permitted to supply tubes that have been used for a hardness test unless Option 1 8 is specified.
Option 18 Supplied tubes shall not contain areas that have been prepared and used for hardness tests.
11.5 Leak tightness test
11.5.1 General
The test shall be carried out in accordance with 1 1 .5.2 or 1 1 .5.3. The choice of test method is at the discretion of the manufacturer, unless Option 1 9 is specified.
Option 19 The test method for verification of leak tightness according to 1 1 .5.2 or 1 1 .5.3 is chosen by the purchaser.
11.5.2 Hydrostatic test
The hydrostatic test shall be carried out at a test pressure of 70 bar or P, calculated from the following equation,whichever is the lower.
 

 
where
P is the test pressure in bar;
D is the specified outside diameter (in mm);
T is the specified wall thickness (in mm);
S is the stress in MPa corresponding to 70 % of the specified minimum yield strength (see Tables 8, 9, 1 0,1 1 and 1 2) for the steel grade concerned.
 
The test pressure shall be held for not less than 5 s for tubes with specified outside diameter less than or equal to 457 mm and for not less than 1 0s for tubes with specified outside diameter greater than 457 mm.
The tube shall withstand the test without leakage or visible deformation.
 
NOTE This hydrostatic leak tightness test is not a strength test.
11.5.3 Electromagnetic test
The test shall be carried out in accordance with EN 1 0246-1 .
11.6 Non-destructive testing
Testing shall be carried out in accordance with one of the following non-destructive testing standards to the acceptance level indicated:
 EN 1 0246-3 - acceptance level E4;
 EN 1 0246-5 - acceptance level F4;
 EN 1 0246-7 - acceptance level U4 sub-category C for T ≤ 4 mm and sub-category D for T > 4 mm.
The choice of method is at the discretion of the manufacturer.
11.7 Dimensional inspection
Specified dimensions shall be verified.
A gauge is used normally for measuring the outside diameter, however for tubes with D equal to or greater than 406,4 mm this may be measured using a circumference tape. The wall thickness shall be measured at the tube ends.
11.8 Visual examination
Tubes shall be visually examined for compliance with the requirement of 8.6.1 .
11.9 Material identification
Each tube from alloy steel in the Tables 6 and Table A.1 shall be tested to assure that the correct grade is being supplied.
11.10 Retests, sorting and reprocessing
For retests, sorting an reprocessing the requirements of EN 1 0021 shall apply.
12 Marking
12.1 Except as provided for in 1 2.2, each tube shall be marked by suitable and durable methods such as painting,stamping, adhesive labels or attached tags with the following:
 the manufacturers name or trademark;
 the number of this Part of this European Standard (EN 1 0297-1 );
 the steel name, e.g. E275;
 the symbol for the delivery condition, see Table 2, except for the condition +AR for grades in Table 3;
 the symbol +H and the cast number for tubes supplied against a hardenability requirement (see 8.5);
 
 
 in the case of specific inspection, the mark of the inspection representative and an identification number (e.g.order or item number) which permits the correlation of the product or delivery unit to the related document.
Example of marking :
X-EN 1 0297-1 - C1 5R+FP - Y - Z
X is the manufacturers name or trademark
Y is the mark of inspection representative
Z is the identification number (e.g. order or item number)
12.2 Where the products are supplied bundled, the marking required in 1 2.1 may be on a label which shall be securely attached to the bundle. Additionally the label or tags shall identify the diameter, wall thickness and type of length of the tube.
 
13 Protection
The tubes shall be delivered without temporary corrosion protection unless Option 20 is specified.
Option 20 Tubes shall be specially protected for transit and storage. The type of coating shall be agreed at the time of enquiry and order.
 
 
 
 
 
Annex A
(normative)
Steels for case hardening
 
 

Steel grade		C		Si	Mn		P	S		Cr		Mo		Ni
Steel name	Steel number	min.	max.	max.	min.	max.	max.	min.	max.	min.	max.	min.	max.	min.	max.
C1 0E	1 .1 1 21	0,07	0,1 3	0,40	0,30	0,60	0,035	-	0,035	-	-	-	-	-	-
C1 5E	1 .1 1 41	0,1 2	0,1 8	0,40	0,30	0,60	0,035	-	0,035	-	-	-	-	-	-
C1 5R	1 .1 1 40	0,1 2	0,1 8	0,40	0,30	0,60	0,035	0,020	0,040	-	-	-	-	-	-
1 6 Mn Cr 5	1 .71 31	0,1 4	0,1 9	0,40	1 ,00	1 ,30	0,035	-	0,035	0,80	1 ,1 0	-	-	-	-
1 6 Mn Cr S 5	1 .71 39	0,1 4	0,1 9	0,40	1 ,00	1 ,30	0,035	0,020	0,040	0,80	1 ,1 0	-	-	-	-
20 Ni Cr Mo 2-2	1 .6523	0,1 7	0,23	0,40	0,65	0,95	0,035	-	0,035	0,35	0,70	0,1 5	0,25	0,40	0,70
20 Ni Cr Mo S 2-2	1 .6526	0,1 7	0,23	0,40	0,65	0,95	0,035	0,020	0,040	0,35	0,70	0,1 5	0,25	0,40	0,70

 
 
 
Annex B
(informative)
Recommended heat treatment temperatures
 
Table B.1 — Recommended heat treatment temperatures in °C for steels in Table A.1
 
 

Steel grade		Heat Treatment for the delivery condition
Steel name	Steel number	+A	+TH	+FP	+N
C1 0E	1 .1 1 21	650 to 700	-	-	900 to 920
C1 5E	1 .1 1 41	650 to 700	-	-	890 to 920
C1 5R	1 .1 1 40	650 to 700	-	-	890 to 920
1 6 Mn Cr 5	1 .71 31	650 to 700	850 to 950	900 to –1 000	840 to 870
1 6 Mn Cr S 5	1 .71 39	650 to 700	850 to 950	900 to –1 000	840 to 870
20 Ni Cr Mo 2-2	1 .6523	650 to 700	850 to 950	900 to –1 000	850 to 880
20 Ni Cr Mo S 2-2	1 .6526	650 to 700	850 to 950	900 to –1 000	850 to 880

 
 
Table B.2 — Recommended heat treatment temperatures °C for steels in Tables 3, 4, 5 and 6
 

Steel grade		Heat treatment
Steel name	Steel number	Anneal	Normalize	Austenitize a	Temper
E235	1 .0308	-	880 to 940	-	-
E275	1 .0225	-	880 to 940	-	-
E31 5	1 .0236	-	890 to 950	-	-
E355	1 .0580	-	900 to 960	-	-
E275K2	1 .0456	-	880 to 940	-	-
E355K2	1 .0920	-	900 to 960	-	-
E420J2	1 .0599		900 to 960
E460K2	1 .8891	-	880 to 950	-	-
E590K2	1 .0644			900 to 960	580 to 680
E730K2	1 .8893	-	-	91 0 to 950	550 to 680
C22E	1 .1 1 51	650 to 700	880 to 920	860 to 900 b	550 to 680
C35E	1 .1 1 81	650 to 700	860 to 900	840 to 880	550 to 680
C45E	1 .1 1 91	650 to 700	840 to 880	820 to 860	550 to 680
C60E	1 .1 221	650 to 700	820 to 860	800 to 840	550 to 680
38Mn6	1 .1 1 27	650 to 700	850 to 880	820 to 850	540 to 680
41 Cr4	1 .7035	650 to 700	840 to –880 c	820 to 860	540 to 680
25CrMo4	1 .721 8	650 to 700	860 to –900 c	840 to 880	540 to 680
30CrMo4	1 .721 6	650 to 700	860 to –900 c	840 to 870	540 to 680
34CrMo4	1 .7220	650 to 700	850 to –890 c	830 to 870	540 to 680
42CrMo4	1 .7225	650 to 700	840 to –880 c	820 to 860	540 to 680
36CrNiMo4	1 .6511	650 to 700	850 to –880 c	820 to 850	540 to 680
30CrNiMo8	1 .6580	650 to 700	850 to –880 c	830 to –860 d	540 to 680
41NiCrMo7-3-2	1 .6563	650 to 700	860 to –890 c	840 to 870	530 to 680
a   Unless otherwise stated temperatures are for water quenching and have to be increased by 1 0 °C for oil quenching. b   Only water quenching. c  These temperatures apply when normalizing is carried out prior to quenching and tempering . d   Only oil quenching.

 
 
 
Annex C
(normative)
Hardness requirements for heat treated tubes
Table C.1 — Brinell hardness requirements for tubes in delivery condition +A, +TH or +FP
 
 

Steel grade		Brinell hardness in delivery condition
Steel name	Steel number	+A	+TH		+FP
			min.	max.	min.	max.
C22E	1 .1 1 51	1 56	-	-	-	-
C35E	1 .1 1 81	1 83	-	-	-	-
C45E	1 .1 1 91	207	-	-	-	-
C60E	1 .1 221	241	-	-	-	-
38Mn6	1 .1 1 27	223	-	-	-	-
41 Cr4	1 .7035	241	-	-	-	-
25CrMo4	1 .721 8	21 2	-	-	-	-
30CrMo4	1 .721 6	223	-	-	-	-
34CrMo4	1 .7220	223	-	-	-	-
42CrMo4	1 .7225	241	-	-	-	-
36CrNiMo4	1 .651 1	241	-	-	-	-
30CrNiMo8	1 .6580	245	-	-	-	-
41NiCrMo7-3-2	1 .6563	248	-	-	-	-
C1 0E	1 .1 1 21	1 31	-	-	-	-
C1 5E	1 .1 1 41	1 43	-	-	-	-
C1 5R	1 .1 1 40	1 43	-	-	-	-
1 6MnCr5	1 .71 31	207	1 56	207	1 40	1 87
1 6MnCrS5	1 .71 39	207	1 56	207	1 40	1 87
20NiCrMo2-2	1 .6523	21 2	1 61	21 2	1 49	1 94
20NiCrMoS2-2	1 .6526	21 2	1 61	21 2	1 49	1 94