有限公司發(fā)布：Q345B無縫鋼管技術(shù)要求
1．Q345B無縫鋼管鋼的熔煉成分應(yīng)符合下表的規(guī)定
|
牌號 |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
|
10 |
0.07~0.13 |
0.17~0.37 |
0.35~0.65 |
≤0.035 |
≤0.035 |
≤0.15 |
≤0.30 |
≤0.25 |
|
20 |
0.17~0.23 |
0.17~0.37 |
0.35~0.65 |
≤0.035 |
≤0.035 |
≤0.25 |
≤0.30 |
≤0.25 |
|
45 |
0.42~0.50 |
0.17~0.37 |
0.50~0.80 |
≤0.035 |
≤0.035 |
≤0.25 |
≤0.30 |
≤0.25 |
|
Q235 |
A |
≤0.22 |
≤0.35 |
≤1.40 |
≤0.030 |
≤0.030 |
≤0.30 |
≤0.30 |
≤0.20 |
|
B |
≤0.20 |
|
C |
≤0.17 |
≤0.030 |
≤0.030 |
|
D |
≤0.025 |
≤0.025 |
|
Q275 |
A |
≤0.24 |
≤0.35 |
≤1.50 |
≤0.030 |
≤0.030 |
≤0.30 |
≤0.30 |
≤0.20 |
|
B |
≤0.21 |
|
C |
≤0.20 |
≤0.030 |
≤0.030 |
|
D |
≤0.025 |
≤0.025 |
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