GB13296 Stainless Seamless Steel Tubes

2021-12-09
GB13296 stainless steel seamless steel tubes for boilers and heat exchangers

 
Scope
Classification, code, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of stainless steel seamless tubes for boilers and heat exchangers.
 
This standard applies to austenitic and ferritic stainless steel seamless tubes for boilers and heat exchangers.
 
 
 
Manufacture
Steel tubes shall be manufactured by hot rolling or cold drawing.
a) Hot rolled steel pipe - WH
b) Cold drawn steel pipe - WC


Main Grade: 0Cr18Ni9, 1Cr18Ni9, 1Cr19Ni9, 00Cr19Ni10, 0Cr18Ni10Ti, 1Cr18Ni11Ti, 0Cr18Ni11Nb, 1Cr19Ni11Nb, 0Cr17Ni14Mo2, 1Cr17Ni12Mo2, 00Cr17Ni14Mo2, 0Cr18Ni12Mo2Ti, 0Cr18Ni12Mo2Ti, 0Cr18Ni12Mo3Ti, 1Cr18Ni12Mo2Ti, 1Cr18Ni9Ti, 0Cr19Ni13Mo3, 00Cr18Ni10N, 00Cr18Ni10N, 0Cr18Ni9N, 0Cr19Ni13, 2Cr23Ni13, 0Cr25Ni20, 2Cr25Ni20, 0Cr18Ni13Si4, 00Cr17Ni13Mo2N, 0Cr17Ni12Mo2N, 0Cr18Ni12Mo2Cu2, 00Cr18Ni14Mo2Cu2, 1Cr17, 00Cr27Mo.

 
The size of steel tube,OD: 6 mm~159 mm, wall thickness: 1.0 mm~14mm,
 





 
Dimension tolerance of GB13296 stainless steel tube

Type Size Tolerance
Hot rolled steel tube - WH OD ≤140 ±1.25% OD
＞140 ±1% OD
WT ≤3 +4%WT
＞3～4 +3.5%WT
＞4～5 +3.3%WT
＞5 +2.8%WT
Cold drawn steel tube - WC OD 6～30 +0.15
-0.20
＞30～50 ±0.30
>50 ±0.75%OD
WT ≤3 ±0.75%OD
OD≤38 +2.0%WT
OD＞38 +2.2%WT
a. After consultation between the supplier and the buyer, the wall thickness tolerance of the steel tube for cold drawn heat exchangers with an outer diameter of not more than 38 mm can be delivered at ±10%S under the condition of constant tolerance; cold drawn heat exchange with outer diameter greater than 38mm The allowable deviation of the wall thickness of the steel tube for the machine can be delivered at ±11%S.





Length
Boiler steel tubes usually have a length of 4 000 mm to 12 000 mm.
Other steel tubes for heat exchangers usually have a length of 3 000 mm to 12 000 mm.
 
 
The bending degree per meter of hot-rolled steel tubes should be ≤2.0mm/m.
The bending degree per meter of cold drawn steel tube should be ≤1.5mm/m.
 

 
 
Chemical composition of GB13296 stainless steel tube
 
    Grade chemical composition (%)
C Si≤ Mn≤ P≤ S≤ Ni Cr Mo Ti≥ 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 1Cr19Ni9 0.04~0.10 1.00 2.00 0.035 0.030 8.00~11.00 18.00~20.00 - - -
4 00Cr19Ni10 0.030 1.00 2.00 0.035 0.030 8.00~12.00 18.00~20.00 - - -
5 0Cr18Ni10Ti 0.08 1.00 2.00 0.035 0.030 9.00~12.00 17.00~19.00 - 5C -
6 1Cr18Ni11Ti 0.04~0.10 0.75 2.00 0.030 0.030 9.00~13.00 17.00~20.00 - 4C~0.60 -
7 0Cr18Ni11Nb 0.08 1.00 2.00 0.035 0.030 9.00~13.00 17.00~19.00 - - N b+Ta:10C~1.00
8 1Cr19Ni11Nb 0.04~0.10 1.00 2.00 0.035 0.030 9.00~13.00 17.00~20.00 - - N b+Ta:8C~1.00
9 0Cr17Ni14Mo2 0.08 1.00 2.00 0.035 0.030 11.00~14.00 16.00~18.00 2.00~3.00 - -
10 1Cr17Ni12Mo2 0.04~0.10 0.75 2.00 0.030 0.030 11.00~14.00 16.00~18.00 2.00~3.00 - -
11 00Cr17Ni14Mo2 0.030 1.00 2.00 0.035 0.030 12.00~15.00 16.00~18.00 2.00~3.00 - -
12 0Cr18Ni12Mo2Ti 0.08 1.00 2.00 0.035 0.030 11.00~14.00 16.00~19.00 1.80~2.50 5C~0.70 -
13 0Cr18Ni12Mo2Ti 0.12 1.00 2.00 0.035 0.030 11.00~14.00 16.00~19.00 1.80~2.50 5(C-0.2)~0.70 -
14 0Cr18Ni12Mo3Ti 0.08 1.00 2.00 0.035 0.030 11.00~14.00 16.00~19.00 2.50~3.50 5C~0.70 -
15 1Cr18Ni12Mo2Ti 0.12 1.00 2.00 0.035 0.030 11.00~14.00 16.00~19.00 2.50~3.50 5(C-0.2)~0.80 -
16 1Cr18Ni9Ti 0.12 1.00 2.00 0.035 0.030 8.00~11.00 17.00~19.00 - 5(C-0.2)~0.80 -
17 0Cr19Ni13Mo3 0.08 1.00 2.00 0.035 0.030 11.00~15.00 18.00~20.00 3.00~4.00 - -
18 00Cr18Ni10 0.030 1.00 2.00 0.035 0.030 11.00~15.00 18.00~20.00 3.00~4.00 - -
19 00Cr18Ni10N 0.030 1.00 2.00 0.035 0.030 8.50~11.50 17.00~19.00 - - N:0.10~0.16
20 0Cr18Ni9N 0.08 1.00 2.00 0.035 0.030 7.00~10.50 18.00~20.00 - - N:0.10~0.16
21 0Cr19Ni13 0.08 1.00 2.00 0.035 0.030 12.00~15.00 22.00~24.00 - - -
22 2Cr23Ni13 0.20 1.00 2.00 0.035 0.030 12.00~15.00 22.00~24.00 - - -
23 0Cr25Ni20 0.08 1.00 2.00 0.035 0.030 19.00~22.00 24.00~26.00 - - -
24 2Cr25Ni20 0.25 1.50 2.00 0.035 0.030 19.00~22.00 24.00~26.00 - - -
25 0Cr18Ni13Si4 0.08 3~5 2.00 0.035 0.030 11.50~15.00 15.00~20.00 - - -
26 00Cr17Ni13Mo2N 0.030 1.00 2.00 0.035 0.030 10.50~14.50 16.00~18.50 2.0~3.0 - N:0.12~0.22
27 0Cr17Ni12Mo2N 0.08 1.00 2.00 0.035 0.030 10.00~14.00 16.00~18.00 2.0~3.0 - N:0.10~0.22
28 0Cr18Ni12Mo2Cu2 0.08 1.00 2.00 0.035 0.030 10.00~14.50 17.00~19.00 1.20~2.75 — Cu:1.00~2.50
29 00Cr18Ni14Mo2Cu2 0.030 1.00 2.00 0.035 0.030 12.00~16.00 17.00~19.00 1.20~2.75 — Cu:1.00~2.50
Ferrite 30 1Cr17a 0.12 0.75 1.00 0.035 0.030 — 16.00~18.00 — —  
31 00Cr27Mob 0.010 0.40 0.40 0.030 0.020 — 25.00~27.50 0.75~1.50 — N≤0.015
Note: 1Cr19Ni9Ti is not recommended for steel grades.
a :allowed to contain not more than 0.60% of Ni;
b :Allows not more than 0.50% of Ni; not more than 0.0% of Cu, but Ni+Cu should be no more than 0.50%.
 



Heat treatment and mechanical properties of steel tubes
 
    Grade Heat treatment temperature（℃） Tensile strength Yield Strength HB Elongation Density
Kg/cm3

 
 
 
 
 

 
 
 
 

 
 
 Austenitic
 
 		 1 0Cr18Ni9 1010-1150 520 205 ≤187 35 7.93
2 1Cr18Ni9 1010-1150 520 205 ≤187 35 7.90
3 1Cr19Ni9 1010-1150 520 205 ≤187 35 7.93
4 00Cr19Ni10 1010-1150 480 175 ≤187 35 7.93
5 0Cr18Ni10Ti 920-1150 520 205 ≤187 35 7.95
6 1Cr18Ni11Ti Cold drawn ≥1095
Hot rolled ≥1050		 520 205 ≤187 35 7.93
7 0Cr18Ni11Nb 980-1150 520 205 ≤187 35 7.98
8 1Cr19Ni11Nb Cold drawn≥1095
Hot rolled ≥1050		 520 205 ≤187 35 8.00
9 0Cr17Ni14Mo2 1010-1150 520 205 ≤187 35 7.98
10 1Cr17Ni12Mo2 ≥1040 520 205 ≤187 35 7.98
11 00Cr17Ni14Mo2 1010-1150 480 175 ≤187 40 7.98
12 0Cr18Ni12Mo2Ti 1000-1100 530 205 ≤187 35 8.00
13 0Cr18Ni12Mo2Ti 1000-1100 540 215 ≤187 35 8.00
14 0Cr18Ni12Mo3Ti 1000-1100 530 205 ≤187 35 8.10
15 1Cr18Ni12Mo2Ti 1000-1100 540 215 ≤187 35 8.10
16 1Cr18Ni9Ti 920-1150 520 205 ≤187 40 7.90
17 0Cr19Ni13Mo3 1010-1150 520 205 ≤187 35 7.98
18 00Cr18Ni10 1010-1150 480 175 ≤217 35 7.98
19 00Cr18Ni10N 1010-1150 515 205 ≤187 35 7.90
20 0Cr18Ni9N 1010-1150 550 240 ≤217 35 7.90
21 0Cr19Ni13 1030-1150 520 205 ≤187 35 7.98
22 2Cr23Ni13 1030-1150 520 205 ≤187 35 7.98
23 0Cr25Ni20 1030-1180 520 05 ≤187 35 7.98
24 2Cr25Ni20 1030-1180 520 205 ≤187 35 7.98
25 0Cr18Ni13Si4 1010-1150 520 205 ≤207 35 7.98
26 00Cr17Ni13Mo2N 1010-1150 515 205 ≤217 35 8.00
27 0Cr17Ni12Mo2N 1010-1150 550 240 ≤217 35 7.80
28 0Cr18Ni12Mo2Cu2 1010-1150 520 205 ≤187 35 7.98
29 00Cr18Ni14Mo2Cu2 1010-1150 480 180 ≤187 35 7.98
Ferrite 30 1Cr17 780-850 410 245 ≤183 20 7.70
31 00Cr27Mo 900-1050 410 245 ≤219 20 7.70
 





Items of testing
 
Hydraulic test
Steel tubes should be hydraulically tested one by one
 
 
Flattening test
Steel tubes with a wall thickness of not more than 10 mm shall be subjected to a flattening test, and cracks and cracks shall not be allowed after the sample is flattened.
 
 
Flaring experiment
Steel tubes with a wall thickness of not more than 10 mm shall be tested for flare. The top core taper of the flaring test is 60°, and the outer diameter flaring rate of the sample after flaring should be 15% for ferritic steel tubes and 18% for austenitic steel tubes. Specimens are not allowed to crack or crack after flaring.

 
Corrosion test
Non-corrosive steel tubes with materials of 2Cr23Ni13 and 2Cr25Ni20 shall not be tested for intergranular corrosion. Other corrosion-resistant austenitic steel tubes shall be tested for intergranular corrosion.
 
 
Grain size
The average grain size of the 1Cr19Ni9, 1Cr17Ni12Mo2, 1Cr18Ni11Ti, and 1Cr19Ni11Nb steel pipes is 4-7.
 
 
Ultrasonic inspection
Steel tubes shall be ultrasonically tested in accordance with the provisions of GB/5777.
 

 
 
Surface Quality
The inner and outer surfaces of the steel tube are not allowed to have cracks, folds, rolling, separation and crusting. These defects shall be completely removed. The surface of the steel tube at the defect removal shall be smooth and angular, and the actual wall thickness at the cleaning site shall not be less than the minimum allowable wall thickness. On the inner and outer surfaces of the steel tube, the allowable depth of the straight road shall comply with the following requirements:

 
a) cold drawn steel tube: not more than 4% of the wall thickness, and the maximum depth is 0.2mm;
b) Hot-rolled steel tube: not more than 5% of the wall thickness, and the maximum depth is 0.4 mm.
 
 

 
 
Packaging, sign and quality certificate
The packaging, marking and quality certificate of steel tubes shall comply with the provisions of GB/T 2102.



Keywords:Stainless steel tube, boiler tube, heat exchanger tube
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