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发明公开
CN107675091A 一种高强高韧低温服役铸钢材料及热处理方法 有权

一种高强高韧低温服役铸钢材料及热处理方法
摘要：
本发明涉及材料成分设计与热处理领域，具体为一种高强高韧低温服役铸钢材料(IMR-LS)及热处理方法。按重量百分比计，铸钢材料的化学成分范围如下：C 0.13～0.24％、Mn 0.80～1.20％、Si 0.17～0.37％、P≤0.015％、S≤0.01％、Ni 1.40～2.50％、Cr 0.8～1.2％、Mo 0.2～0.4％、V 0.01～0.05％、Ti 0.01～0.04％、B+RE+Nb≤0.05％，余量为Fe。根据钢的化学成分制定均匀化及超细化热处理工艺，并选取合适温度进行回火，满足材料性能。本发明通过优选钢种成分范围及进行特有热处理，最终使制备的低温服役铸钢材料具有高强高韧属性，其中屈服强度≥655MPa，抗拉强度≥795MPa，延伸率≥14％，断口收缩率大于30％，并且材料V口冲击在-45℃低温冲击值大于27J。
摘要（英）：

The invention relates to the field of material component design and heat treatment, in particular to a high-strength and high-toughness low-temperature serving cast steel material (IMR-LS) and a heattreatment method. The cast steel material comprises the following chemical components in percentage by weight: 0.13-0.24% of C, 0.80-1.20% of Mn, 0.17-0.37% of Si, P not more than 0.015%, S not more than 0.01%, 1.40-2.50% of Ni, 0.8-1.2% of Cr, 0.2-0.4% of Mo, 0.01-0.05% of V, 0.01-0.04% of Ti, B+RE+Nb not more than 0.05%, and the balance of Fe. The uniform and ultrafine heat treatment process isformulated according to the chemical components of steel; and a proper temperature is selected for tempering to satisfy the material performances. Through optimization of steel component ranges and special heat treatment, the prepared low-temperature serving cast steel material achieves high-strength and high-toughness attributes, wherein the yield strength is not less than 655 MPa, the tensile strength is not less than 795 MPa, the ductility is not less than 14%, the reduction of area at fracture is more than 30%, and the low-temperature material V port impact value at -45 DEG C is more than27 J.

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