GB/T14975 Stainless Seamless Steel Pipe For Structure

2021-12-09
GB/T14975 stainless seamless steel pipe for structure
 
This standard specifies the classification, code, size, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of stainless steel seamless steel pipes for structure.


GB/T14975 Stainless Steel Seamless Steel Pipe Quick Details
Company Name: beite steel pipe( China)
Product Name：Stainless Seamless Steel Pipe
FOB Price: US $1521-3600 / Ton | 1 Ton/Tons (Min. Order)
Port of Shipment：Tianjin,China
Payment：L/C or T/T
Outside Diameter：21mm——219mm
Wall thickness：3mm——15mm
Length：6000mm、or specified length as required. 
Delivery: 7-15 days after payment
Package：Standard export package,suit for all kinds of transport, or as required
Certificate：ISO 9001-2000,PED 97/23/EC,ASME,DNV


Manufacture
Steel tubes shall be manufactured by hot rolling or cold drawing.
a) Hot rolled steel pipe - WH
b) Cold drawn steel pipe - WC
 
 
Usual length
Hot rolled stainless steel tube: 2m - 12m
Hot rolled stainless steel tube: 1m - 8m
 
 
The bending of the steel pipe shall not be greater than the following:
Wall thickness <15mm, 1.5mm/m
Wall thickness ≥ 15mm, 2.0mm/m
Thermal expansion tube, 3.0mm/m
 

 
Grades and chemical compositions of stainless steel seamless pipes for structure

Table 1 Chemical compositions of GB/T14975

     Grade Chemical compositions (%)
C Si Mn P S Ni Cr Mo other
 
 
 
Austenitic 		 1 0Cr18Ni9 ≤ 0.07 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 8.00~11.00 17.00~19.00 - -
2 1Cr18Ni9 ≤ 0.15 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 8.00~10.00 17.00~19.00 - -
3 00Cr19Ni10 ≤ 0.030 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 8.00~12.00 18.00~20.00 - -
4 0Cr18Ni10Ti ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 9.00~12.00 17.00~19.00 - Ti ≥ 5C%
5 0Cr18Ni11Nb ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 9.00~13.00 17.00~19.00 - Nb ≥ 10C%
6 0Cr17Ni12Mo2 ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 10.00~14.00 16.00~18.50 2.00~3.00 -
7 00Cr17Ni14Mo2 ≤ 0.030 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 12.00~15.00 16.00~18.00 2.00~3.00 -
8 0Cr18Ni12Mo2Ti ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 11.00~14.00 16.00~19.00 1.80~2.50 Ti 5C% ~ 0.70
9 1Cr18Ni12Mo2Ti ≤ 0.12 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 11.00~14.00 16.00~19.00 1.80~2.50 Ti 5 (C%-0.02)~0.80
10 0Cr18Ni12Mo3Ti ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 11.00~14.00 16.00~19.00 2.50~3.50 Ti 5C% ~ 0.70
11 1Cr18Ni12Mo3Ti ≤ 0.12 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 11.00~14.00 16.00~19.00 2.50~3.50 Ti 5 (C%-0.02)~0.80
12 1Cr18Ni9Ti ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 8.00~11.00 17.00~19.00 - Ti 5 (C%-0.02)~0.80
13 0Cr19Ni13Mo3 ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 11.00~15.00 18.00~20.00 3.00~4.00 -
14 00Cr19Ni13Mo3 ≤ 0.030 ≤ 1.00 ≤ 2.00 ≤ 0.035 ≤ 0.030 11.00~15.00 18.00~20.00 3.00~4.00 -
Ferritic type 15 0Cr13 ≤ 0.08 ≤ 0.60 ≤ 0.80 ≤ 0.035 ≤ 0.030 * 12.00~14.00 - -
16 1Cr17 ≤ 0.12 ≤ 0.75 ≤ 1.00 ≤ 0.035 ≤ 0.030 * 16.00~18.00 - -
Martensite 
 		 17 1Cr13 ≤ 0.15 ≤ 1.00 ≤ 1.00 ≤ 0.035 ≤ 0.030 * 11.50~13.50 - -
18 2Cr13  0.16~0.25 ≤ 1.00 ≤ 1.00 ≤ 0.035 ≤ 0.030 * 12.00~14.00 - -

Note: * Residual element Ni ≤ 0.60.



Mechanical properties of GB/T14975 stainless steel seamless steel for structure

Table 2 Mechanical properties of GB/T14975

    Grade Heat treatment Mechanical properties Density (g/c m ( 3 ) )
Tensile Strength MPa Yield Strength 
MPa		 Elongation(%)
Min  
Austenitic 1 0Cr18Ni9 1010~1150 ℃ , 520 205 35 7.93
2 1Cr18Ni9 1010~1150 ℃ , 520 205 35 7.90
3 00Cr19Ni10 1010~1150 ℃ , 480 175 35 7.93
4 0Cr18Ni10Ti 920~1150 ℃ , 520 205 35 7.95
5 0Cr18Ni11Nb 980~1150 ℃ , 520 205 35 7.98
6 0Cr17Ni14Mo2 1010~1150 ℃ , 520 205 35 7.98
7 00Cr17Ni14Mo2 1010~1150 ℃ , 480 175 35 7.98
8 0Cr18Ni12Mo2Ti 1000~1100 ℃ , 530 205 35 8.00
9 1Cr18Ni12Mo2Ti 1000~1100 ℃ , 530 205 35 8.00
10 0Cr18Ni12Mo3Ti 1000~1100 ℃ , 530 205 35 8.10
11 1Cr18Ni12Mo3Ti 1000~1100 ℃ , 530 205 35 8.10
12 1Cr18Ni9Ti 1000~1100 ℃ , 520 205 35 7.90
13 0Cr19Ni13Mo3 1010~1150 ℃ , 520 205 35 7.98
14 00Cr19Ni13Mo3 1010~1150 ℃ , 480 175 35 7.98
Ferritic type 15 0Cr13 780~830 ℃ , 370 180 22 7.70
16 1Cr17 780~850 ℃ , 410 245 20 7.70
Martensite  17 1Cr13 800~900 ℃ , 410 205 20 7.70
18 2Cr13 800~900 ℃ , 470 215 19 7.70

Note: 1. The tensile strength of the heat accumulator can be reduced by 20 MPa.
2 . The steel pipe is heat treated and pickled for delivery. Steel pipes that have been heat treated by integral fire and fire protection atmosphere can be delivered without pickling.
3 . Steel pipes for machining can be delivered without pickling.


Dimension tolerance for GB/T14975
Table 3 Dimension tolerance of GB/T14975

 Hot rolled steel pipe  Cold drawn steel pipe
 
Size/mm		  
 Tolerance /mm
 		  
Size /mm		  
 Tolerance  /mm
 
 
Ordinary level		  
Higher level		  
Ordinary level		  
Higher level
OD 68 ≤ OD ≤ 159 ± 1.25  
± 1		  
OD		 10 ≤ OD ≤ 30 ± 0.30 ± 0.20
159<OD ≤ 426 ± 1.5 30<OD ≤ 50 ± 0.40 ± 0.30
OD>5 ± 0.9% 0.8%
±WT  
<15		 +15
-12.5		  
± 12.5		 ≤ 3 ≤ 3 ± 14%
 		 +12%
-10%
≥ 15 +20
-15		 WT >3 +12%
-10%		 ± 10%


Note: The steel pipe for machining should be indicated in the contract. According to the requirements of the purchaser, the machining allowance can be specified by agreement between the supplier and the buyer.



Items of Testing
 
Flaring test
A steel pipe having a wall thickness of less than or equal to 10 mm can be subjected to a flare test. The top taper of the flare test is 30', 45. Or 60. One of them, the expansion of the outer diameter after the flare is 100,.. After the flare, the specimen shall not have cracks or cracks.
 
Hydraulic test
The steel pipe shall be hydraulically tested one by one. Under the test pressure, the pressure resistance time shall be not less than 5 s, and the steel pipe shall not leak or leak.
The supplier may use ultrasonic testing or eddy current testing instead of hydraulic testing. Ultrasonic inspection is carried out according to GB/T5. The depth of the comparison sample is 1.0 of the nominal wall thickness of the steel pipe. The eddy current test comparison tube adopts Class A of G/595.
 
Intergranular corrosion test
Austenitic and austenitic-ferritic steel tubes can be tested for intergranular corrosion.
The intergranular corrosion test method is in accordance with the provisions of GB/T 434.1-43. The specific corrosion test method is agreed by the supplier and the buyer and stated in the contract. If it is not clear, it shall be carried out in accordance with the test of GB/T434.5.
 
 
Surface Quality
The inner and outer surfaces of the steel pipe shall be free of cracks, folds, rolling, separation and crusting. These defects shall be completely removed and the depth of removal shall not exceed the negative deviation of the nominal wall thickness. The actual wall thickness at the cleaning site shall not be less than the minimum allowed by the wall thickness.
 
On the inner and outer surfaces of the steel pipe, the allowable depth of the straight road is as follows:
Hot-rolled (extruded, expanded) steel pipe: not more than 5% of the nominal wall thickness, the diameter of the steel pipe less than or equal to 140mm, the maximum allowable depth is not more than 0.5mm; the diameter of the steel pipe larger than 140mm, the maximum allowable depth is not more than 0.8mm.
Cold drawn (rolled) steel pipe: 4% of the nominal wall thickness of the sub-size (the allowable depth of the straight pipe with a wall thickness of less than 1.4 mm is .05), and the maximum depth is not greater than. .30mm.
 
Other defects that do not exceed the negative deviation of the wall thickness are allowed to exist.
The steel pipe for machining shall be agreed by the supplier and the buyer. The contract shall state that the supplier shall be able to ensure that the above defect depth is within the machining allowance range.



The packaging, marking and quality certificate of steel pipes shall comply with the relevant provisions of GB/T2102.
 
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