| 结构用无缝钢管(GB/T8162) 中国标准：GB/T8162-2008 钢 级：20，45，20Mn，Q345B，Q345C,Q345D,45Mn2, 27SiMn 交货状态：热轧 规格范围：外径73MM-630MM ,壁厚4MM-35MM 公 差：按照GB/T8162-2008标准 长 度：根据客户要求 证 书：GB/T19001-2008 ● 化学成分（熔炼分析）％ 钢级 | C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | B | Als | 20 | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.030 | / | / | / | ≤0.25 | ≤0.30 | ≤0.25 | / | / | / | / | 45 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.030 | / | / | / | ≤0.25 | ≤0.30 | ≤0.25 | / | / | / | / | 20Mn | 0.17-0.23 | 0.07-0.37 | 0.70-1.00 | ≤0.035 | ≤0.030 | / | / | / | ≤0.25 | ≤0.30 | ≤0.25 | / | / | / | / | Q345B | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 | ≤0.07 | ≤0.15 | ≤0.20 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.012 | ≤0.10 | / | / | Q345C | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.030 | ≤0.07 | ≤0.15 | ≤0.20 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.012 | ≤0.10 | / | ≥0.015 | Q345D | ≤0.18 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.025 | ≤0.025 | ≤0.15 | ≤0.20 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.012 | ≤0.10 | / | ≥0.015 | 45Mn2 | 0.42-0.49 | 0.17-0.37 | 1.40-1.80 | ≤0.035 | ≤0.035 | / | / | / | ≤0.25 | / | ≤0.25 | / | ≤0.25 | / | / | 27SiMn | 0.24-0.32 | 1.10-1.40 | 1.10-1.40 | ≤0.035 | ≤0.035 | / | / | / | ≤0.30 | / | ≤0.20 | / | ≤0.30 | / | / |
● 机械性能 钢级 | 屈服强度 min
Mpa | 抗拉强度 Mpa | 伸长率 | 冲击试验 | T in
mm | ≤16 | ＞16
≤30 | ＞30 | 温度/℃ | 冲击功/J | ≥ | 20 | 245 | 235 | 225 | ≥410 | ≥20 | - | - | 45 | 335 | 325 | 315 | ≥590 | ≥14 | - | - | 20Mn | 275 | 265 | 255 | ≥450 | ≥20 | - | - | Q345B | 345 | 325 | 295 | 470-630 | ≥20 | 20 | 34 | Q345C | 345 | 325 | 295 | 470-630 | ≥21 | 0 | 34 | Q345D | 345 | 325 | 295 | 470-630 | ≥21 | -20 | 34 | 45Mn2 | 885 | ≥735 | ≥10 | - | - | 27SiMn | 980 | ≥835 | ≥12 | - | - |
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