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| 質(zhì)量等級 | 化學(xué)元素含量（%） | ||||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | AL | Ti | |
| 200 | ≤0.15 | ≤0.35 | 0.60~1.70 | ≤0.30 | ≤0.30 | ≤0.25 | ≤0.50 | ≤0.40 | ≤0.10 | ≤0.100 | ≤0.040 |
| 250 | ≤0.22 | ≤0.55 | 0.70~1.70 | ≤0.40 | ≤0.30 | ≤0.25 | ≤0.50 | ≤0.40 | ≤0.10 | ≤0.100 | ≤0.040 |
| 300 | ≤0.22 | ≤0.55 | 0.70~1.70 | ≤0.40 | ≤0.30 | ≤0.25 | ≤0.50 | ≤0.40 | ≤0.10 | ≤0.100 | ≤0.040 |
| 350 | ≤0.22 | ≤0.55 | 0.70~1.70 | ≤0.40 | ≤0.30 | ≤0.25 | ≤0.50 | ≤0.40 | ≤0.35 | ≤0.100 | ≤0.040 |
| 400 | ≤0.22 | ≤0.55 | 0.70~1.70 | ≤0.40 | ≤0.30 | ≤0.25 | ≤0.50 | ≤0.40 | ≤0.35 | ≤0.100 | ≤0.040 |
| 450 | ≤0.22 | ≤0.55 | 0.80~1.70 | ≤0.40 | ≤0.30 | ≤0.25 | ≤0.50 | ≤0.60 | ≤0.35 | ≤0.100 | ≤0.040 |
| WR350 | ≤0.14 | ≤0.15 | 0.75~1.70 | ≤0.160 | ≤0.30 | 0.35~1.05 | ≤0.55 | 0.15~0.50 | ≤0.10 | ≤0.100 | ≤0.040 |
| 質(zhì)量等級 | 屈服強(qiáng)度 | 抗拉強(qiáng)度 | 伸長率 | ||||||
| 厚度（mm） | |||||||||
| ≤8 | ＞8≤12 | ＞12≤20 | ＞20≤32 | ＞32≤50 | ＞50≤80 | ＞80≤150 | 300 | 24 | |
| 200 | 200 | 200 | - | - | - | - | - | 300 | 24 |
| 250 | 280 | 260 | 250 | 250 | 250 | 240 | 230 | 410 | 22 |
| 21300 | 320 | 310 | 300 | 280 | 280 | 270 | 260 | 430 | 21 |
| 350 | 360 | 360 | 350 | 340 | 340 | 340 | 330 | 450 | 20 |
| 400 | 400 | 380 | 360 | 360 | 360 | 360 | 480 | 18 | |
| 450 | 450 | 450 | 420 | 400 | - | - | 520 500 | 16 18 | |
| WR350 | 340 | 340 | 340 | 340 | - | - | 450 | 20 | |
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