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发明授权
CN105401075B 一种420MPa级H型钢及其制备方法 有权

一种420MPa级H型钢及其制备方法
摘要：
本发明提供了一种420MPa级高强度低屈强比H型钢及其制备方法，所述H型钢的化学成分按重量百分数计为：C 0.11～0.15％、Si 0.20～0.35％、Mn 1.35～1.50％、P≤0.035％、S≤0.025％，Cu 0.25‑0.30％，Cr 0.40‑0.45，Ni 0.20‑0.30％，Nb 0.20‑0.30％，其余为铁和微量杂质。本发明通过优化成分设计，结合控制加热，使高终轧温度工艺条件下生产420MPa级低屈强比H型钢成为可能，并实现了该类产品的批量生产。本发明的力学性能良好，屈服强度大于427MPa，抗拉强度大于641MPa，屈强比0.64～0.67。
摘要（英）：

The invention provides 420 MPa-grade high-strength low-yield-ratio H-shaped steel and a preparation method thereof. The H-shaped steel is prepared from, by weight, 0.11%-0.15% of C, 0.20-0.35% of Si, 1.35%-1.50% of Mn, 0%-0.035% of P, 0%-0.025% of S, 0.25%-0.30% of Cu, 0.40%-0.45% of Cr, 0.20%-0.30% of Ni, 0.20%-0.30% of Nb and the balance iron and a micro quantity of impurities. According to the 420 MPa-grade high-strength low-yield-ratio H-shaped steel and the preparation method thereof, by combining the optimized component design with heating control, it becomes possible to produce the 420 MPa-grade high-strength low-yield-ratio H-shaped steel under the high finish rolling temperature technological condition, and mass production of the 420 MPa-grade high-strength low-yield-ratio H-shaped steel is achieved. The 420 MPa-grade high-strength low-yield-ratio H-shaped steel is good in mechanical property, the yield strength of the H-shaped steel is higher than 427 MPa, the tensile strength of the H-shaped steel is higher than 641 MPa, and the yield ratio of the H-shaped steel is 0.64-0.67.

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