流體用無縫鋼管(GB/T8163-2008) 中國標準:GB/T8163-2008 鋼 級:20#,Q345B,Q345C,Q345D 交貨狀態:熱軋 規格范圍:外徑73MM-630MM ,壁厚4MM-35MM 公 差:按照GB/T8163-2008標準 長 度:根據客戶要求 證 書:GB/T19001-2008 ● 化學成分(熔煉分析)% 鋼級 | 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 | / | / | / | / | / | ≤0.25 | ≤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 | ≤0.07 | ≤0.15 | ≤0.20 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.012 | ≤0.10 | / | ≥0.015 |
機械性能
鋼級 | 屈服強度 min Mpa | 抗拉強度 Mpa | 伸長率 | 沖擊試驗 | T in
mm | ≤16 | >16 ≤30 | >30 | 溫度/℃ | 沖擊功/J | ≥ | 20# | 245 | 235 | 225 | ≥410 | ≥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 | 備注: |
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