Table 4 Chemical constituents of pipe materials (Wt%)
From: Failure analysis of weld cracking of gas gathering pipeline in dewatering station
Numbering element | Maximum content (wt%) | ||
|---|---|---|---|
A pipe section | B pipe section | GB/T9711-2017 standard requires | |
C | 0.134 | 0.13 | ≤0.24 |
Si | 0.25 | 0.255 | ≤0.45 |
Mn | 1.363 | 1.327 | ≤1.4 |
P | 0.011 | 0.015 | ≤0.025 |
S | 0.003 | 0.004 | ≤0.015 |
Cr | 0.071 | 0.062 | ≤0.3 |
Mo | 0.013 | 0.01 | ≤0.15 |
Ni | 0.032 | 0.032 | ≤0.3 |
Nb | 0.025 | 0.037 | ≤ 0.05 |
V | 0.075 | 0.062 | ≤ 0.1 |
Ti | 0.002 | 0.015 | ≤ 0.04 |
Cu | 0.032 | 0.044 | ≤0.5 |
B | <0.0001 | <0.0001 | ≤0.001 |
V+Ti+Nb | 0.102 | 0.054 | ≤0.15 |
Carbon equivalent (CEIIW) | 0.397 | 0.383 | ≤0.43 |