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发明公开
CN105385955A 一种屈服强度500MPa级焊接结构钢及制备方法 无效 - 驳回

一种屈服强度500MPa级焊接结构钢及制备方法
摘要：
一种屈服强度500MPa级焊接结构钢及制备方法，属于低合金结构钢控制轧制技术领域。焊接结构钢化学成分按质量百分比为：C：0.05～0.07％、Si≤0.3％、Mn：1.5～1.6％、P≤0.012％、S≤0.005％、Cu：0.3～0.35％、Ni：0.40～0.50％、Cr：0.30～0.4％、Mo：0.25～0.30％、Nb：0.03～0.04％、Ti≤0.02％、Alt≤0.04％，余量为Fe及杂质。步骤主要通过钢坯加热，两阶段控轧工艺，轧后待温，钢板堆冷≥24小时后，450～550℃回火处理。优点在于：具有低Pcm，保证了具有优良的焊接性能。
摘要（英）：

The invention discloses welded structural steel with yield strength of 500 MPa and a preparation method and belongs to the technical field of low-alloy structural steel control and rolling. The welded structural steel is prepared from, by mass, 0.05%-0.07% of C, 0.3% of Si or less, 1.5%-1.6% of Mn, 0.012% of P or less, 0.005% of S or less, 0.3%-0.35% of Cu, 0.40%-0.50% of Ni, 0.30%-0.4% of Cr, 0.25%-0.30% of Mo, 0.03%-0.04% of Nb, 0.02% of Ti or less, 0.04% of Alt or less and the balance F and impurities. The method mainly comprises the steps that billet heating and a two-stage control and rolling process are carried out, the billet is cooled to be warm after being rolled, and after steel plate stack cooling is carried out for 24 hours or more, tempering is carried out at the temperature of 450 DEG C to 550 DEG C. The welded structural steel and the preparation method have the advantages that low Pcm is achieved, and the excellent welding performance is guaranteed.

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