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发明授权
CN108251737B 一种屈服强度550MPa级高强度耐候钢的制造方法 有权

一种屈服强度550MPa级高强度耐候钢的制造方法
摘要：
本发明提供了一种屈服强度550MPa级高强度耐候钢的制造方法。所述屈服强度550MPa级高强度耐候钢化学成分重量百分比为C：0.03～0.08wt％，Si≤0.15wt％，Mn：0.70～1.40wt％，P≤0.020wt％，S≤0.008wt％，Alt：0.020～0.050wt％，N≤0.006wt％，Cu：0.20～0.55wt％，Cr：0.30～0.60wt％，Ni：0.04～0.20wt％，Ti：0.05～0.09wt％；余量为Fe和不可避免的微量元素。所述高强度耐候钢的制造方法，包括以下依次进行的工艺步骤：高炉铁水冶炼、铁水脱硫预处理、转炉钢水冶炼、LF钢水精炼处理、RH钢水精炼处理、板坯连铸、热连轧、平整。
摘要（英）：

The invention provides a manufacturing method of high strength weathering steel with yield strength of 550 MPa grade. The high strength weathering steel with the yield strength of 550 MPa grade comprises, by weight, 0.03-0.08% of C, no more than 0.15% of Si, 0.70-1.40% of Mn, no more than 0.020% of P, no more than 0.008% of S, 0.020-0.050% of Alt, no more than 0.006% of N, 0.20-0.55% of Cu, 0.30-0.60% of Cr, 0.04-0.20% of Ni, 0.05-0.09% of Ti, and the balance Fe and inevitable trace elements. The manufacturing method of the high strength weathering steel comprises the following process steps of blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF molten steel refining treatment, RH molten steel refining treatment, slab continuouscasting, hot continuous rolling and leveling which are carried out in sequence.

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