压力容器用12Cr2Mo1R钢150 mm超厚板热处理对组织和性能的影响

试验用12Cr2Mo1R钢(/%:0.08C,0.07Si,0.45Mn,2.16Cr,0.95Mo,0.18Ni,0.14Cu,0.015Al,0.015Sn)经电弧炉-300 mm×2 000 mm电渣重熔扁坯轧制成150 mm厚板(开轧1145℃,终轧850℃)。通过热模拟试验和温度场的有限元仿真得出12Cr2Mo1R钢的静态连续冷却转变(CCT)曲线和超厚板表面、厚度1/4处和1/2处(心部)的冷却温度曲线。热轧板经916℃ 226 min正火,698℃ 240 min回火后,钢板1/4厚度处为贝氏体+少量铁素体,1/2厚度处为贝氏体+铁素体,其力学性能-屈服强度464 MPa,抗拉强度585 MPa,伸长率22%,符合供货要求。

Effect of Heat Treatment on Structure and Properties of 150 mm Ultra-Heavy Plate of Steel 12Cr2Mo1R for Pressure Vessel

The tested steel 12Cr2Mo1R (/% : 0. 08C, 0. 07Si, 0.45Mn, 2.16Cr, 0.95Mo, 0.18Ni, 0. 14Cu, 0. 015Al, 0.015Sn) is melted by EAF then electro-slag remelted to 300 mm x 2 000 mm slab and rolled to 150 mm heavy plate (Opening rolling 1145℃, final rolling 850℃). The static continuous cooling transformation ( CCT) curves and the cooling temperature curves of surface, 1/4 thickness and 1/2 thickness ( center) of ultra-heavy plate of steel 12Ci2Mo1R are obtained by thermal simulation test and finite element simulation of temperature field. With normalized at 916 °C for 226 min and tempered at 698 °C for 240 min the structure of hot rolled plate at 1/4 thickness is bainite + minor ferrite, and that at 1/2 thickness is bainite + ferrite, its mechanical properties are yield strength 464 MPa, tensile strength 585 MPa and elongation 22% to meet the requirement of user.