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发明授权
CN108441779B 一种高强度高屈强比核电站机械模块用钢及其制造方法 有权

一种高强度高屈强比核电站机械模块用钢及其制造方法
摘要：
本发明公开一种高强度高屈强比核电站机械模块用钢及其制造方法。钢中含有，C:0.09％～0.12％，Si:0.30％～0.40％，Mn:0.50％～0.70％，P≤0.010％，S≤0.002％，Cr:0.60％～0.90％，Ni:0.30％～0.50％，Mo:0.26％～0.45％，V:0.005％～0.030％，B:0.001％～0.005％，Ti≤0.015％，Al:0.010％～0.025％，其余为Fe和不可避免的杂质；1565～1575℃真空脱气；钢坯加热温度1200～1250℃，开轧温度1100～1150℃，终轧温度≥1000℃，总变形量≥60％，淬火温度900～920℃，保温时间2～3.5min/mm；回火温度625～660℃，保温时间4～6min/mm。钢板厚度20～110mm，抗拉强度≥700MPa，屈强比≥0.9。
摘要（英）：

The invention discloses high-strength and high-yield-ratio nuclear power station mechanical module steel and a manufacturing method thereof. The steel comprises 0.09%-0.12% of C, 0.30%-0.40% of Si, 0.50%-0.70% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.002% of S, 0.60%-0.90% of Cr, 0.30%-0.50% of Ni, 0.26%-0.45% of Mo, 0.005%-0.030% of V, 0.001%-0.005% of B, smaller than or equal to 0.015% of Ti, 0.010%-0.025% of Al and the balance Fe and inevitable impurities. Vacuum degassing is conducted at the temperature ranging from 1,565 DEG C to 1,575 DEG C; the steel blankheating temperature ranges from 1,200 DEG C to 1,250 DEG C, the initial rolling temperature ranges from 1,100 DEG C to 1,150 DEG C, the finish rolling temperature is larger than or equal to 1,000 DEGC, total deformation is larger than or equal to 60%, the quenching temperature ranges from 900 DEG C to 920 DEG C, and the heat preservation time ranges from 2 min/mm to 3.5 min/mm; the tempering temperature ranges from 625 DEG C to 660 DEG C, and the heat preservation time ranges from 4 min/mm to 6 min/mm; and the steel plate thickness ranges from 20 mm to 110 mm, the tensile strength is largerthan or equal to 700 MPa, and the yield ratio is larger than or equal to 0.9.

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