Seamless 20G

20 # (20 # steel) high-pressure seamless steel pipe seamless steel pipe and 20g What is the difference
20 # steel, there are 20g. They like the carbon content in addition to outside, 20g is more suitable for some trace elements using the characteristics of boiler and pressure vessel. Also 20g also focus on testing its physical properties. Such as bending, impact and tensile properties.
20 steel pipe standard description of the detailed parameters and
Unified numbering U20252
GB/T--20 (GB)
ISO - Steel Code no such standard (international standard)
ГОСТ ------ 20 (the former Soviet Union)
ASTM - 1020 (U.S.)
JIS - S20C (Japan)
DIN - C22 (the former Federal Republic of Germany)
BS - 1C22 (UK)
NF - C22 (France)
Note: Some grades of steel in China is no ISO code.
20 components:
C - (0.17 ~ 0.24)%
Si - (0.17 ~ 0.37)%
Mn - (0.35 ~ 0.65)%
P - ≤ 0.040%
S - ≤ 0.040%
Yield point σ ^ s - not less than 250MPa
Tensile strength σ ^ b - not less than 420MPa
Elongation of not less than 25% of δ ----
Reduction of area ψ ---- no less than 55%
Impact toughness a ^ K - no
Hardness HBS - hot-rolled steel 156
Seamless weight formula: [(OD - Wall Thickness) * Thickness] * 0.02466 = kg / m (weight per meter)

20G seamless pipe (GB5310-2008)
Specifications Specifications Specifications Specifications
10 * 2 38 * 4.5 60 * 7108 * 4
14 * 2 38 * 560 * 8108 * 4.5
14 * 3 38 * 6 63.5 * 3108 * 5
18 * 3 40 * 2 108 63.5 * 3.5 * 6
19 * 2 40 * 3.5 63.5 * 4 108 * 7
19 * 2.75 42 * 3 63.5 * 4.5 108 * 8
19 * 3 42 * 3.5 63.5 * 5108 * 9
20 * 2 42 * 4 63.5 * 6 108 * 10
22 * 2 42 * 4.5 12.5 63.5 * 9108 *
22 * 2.5 42 * 5 63.5 * 10 114 * 4
22 * 3 45 * 68 * 4114 * 2.5 4.5
22 * 3.5 45 * 368 * 6114 * 5
22 * 4 45 * 3.5 70 * 3 114 * 6
25 * 2 45 * 4 70 * 3.5 114 * 9
2.5 45 * 25 * 70 * 4133 * 4.5 4.5
25 * 345 * 570 * 133 * 5 4.5
25 * 3.5 45 * 670 * 5133 * 6
25 * 448 * 370 * 6133 * 6.5
25.4 * 4.5 48 * 3.5 70 * 8133 * 7
27 * 2.5 48 * 470 * 9133 * 8
4.5 2.5 48 * 28 * 70 * 10 133 * 9
28 * 351 * 373 * 133 * 10 3.5
3.5 51 * 28 * 73 * 4133 * 3.2 12.5
28 * 4 51 * 3.5 73 * 4.5 140 * 6
28 * 4.5 51 * 473 * 5140 * 8
30 * 3 51 * 4.5 73 * 5.5 140 * 10
32 * 2 51 * 573 * 7159 * 4.5
32 * 2.5 51 * 676 * 159 * 5 3.5
32 * 3 54 * 76 * 4159 * 3.5 5.5
32 * 3.5 54.5 * 3.5 76 * 4.5 159 * 6
32 * 454 * 576 * 5159 * 7
32 * 4.5 57 * 376 * 6159 * 8
32 * 5 57 * 3.5 76 * 7159 * 10
34 * 357 * 489 * 4159 * 12
34 * 3.5 * 4.5 57 * 589 168 * 5
34 * 457 * 689 * 5168 * 6
34 * 4.5 57 * 10 89 * 6168 * 7
34 * 5 57 * 12 89 * 7168 * 8
34 * 860 * 389 * 8168 * 9
36 * 4 60 * 3.5 89 * 10 168 * 10
38 * 2.5 60 * 4102 * 4194 * 6
38 * 3 60 * 4.5 4.5 194 * 102 * 7
38 * 3.5 60 * 5102 * 5194 * 9
38 * 460 * 6102 * 6194 * 10
Specifications Specifications Specifications Specifications
194 * 11 245 * 18325 * 12426 * 12
219 * 6245 * 20 325 * 13 426 * 13
6.5 219 * 273 * 7325 * 14 426 * 14
219 * 7273 * 8325 * 15 426 * 16
219 * 8273 * 9325 * 16 426 * 17
9.5 219 * 9273 * 325 * 18 426 * 18
219 * 10 273 * 10 325 * 20 426 * 19
219 * 11 273 * 11 325 * 25 426 * 20
219 * 12 273 * 12 351 * 10 426 * 25
219 * 13 273 * 13377 * 9457 * 14
219 * 14 273 * 14 377 * 10 480 * 10
219 * 15 273 * 15 377 * 11 480 * 11
219 * 16 273 * 16 377 * 12 480 * 12
219 * 18 273 * 18 377 * 13 480 * 14
219 * 20 273 * 20 377 * 14 480 * 16
219 * 25 273 * 25 377 * 15 530 * 9
245 * 7273 * 30 377 * 16 530 * 10
245 * 8273 * 36 377 * 17 530 * 13
245 * 9299 * 12 377 * 25 530 * 14
245 * 10 325 * 8426 * 8530 * 20
245 * 12 325 * 9426 * 9
245 * 14 325 * 10 426 * 10
245 * 16 325 * 11426 * 1
Seamless 20G tolerance
Standard deviation OD tolerance level
D1 ± 1.5%, minimum ± 0.75 mm
D2 ± 1.0%. Minimum ± 0.50 mm
D3 ± 0.75%. Minimum ± 0.30 mm
D4 ± 0.50%. ± 0.10 mm minimum