核电站用特宽特厚SA-516Gr.70钢板的开发
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摘要
通过镍、钒和铌的微合金化以及采用控制轧制、正火处理等工艺方法,鞍钢成功开发出了80 mm厚、5 000 mm宽的SA-516Gr. 70钢板,并对钢板进行了力学性能检测和显微组织分析。结果表明,试制的特宽特厚SA-516Gr. 70钢板的显微组织为均匀细小的块状铁素体和条带状珠光体,晶粒度为9级,具有良好的强韧性。在经过605℃保温15 h的模拟焊后热处理后,钢板的室温抗拉强度为501 MPa,屈服强度为310 MPa,断后伸长率为40%,0℃冲击吸收能量大于200 J,力学性能达到了技术要求。
SA-516 Gr. 70 plate 80 mm thick by 5 000 mm wide was successfully developed by microalloying with nickel, vanadium and niobium as well as by use of controlled rolling and normalizing in Ansteel. The mechanical properties were tested,and the microstructure was examined for the plate. The results showed that the trial-produced extra-wide extra-thick SA-516 Gr. 70 plate exhibited microstructure consisting of fine and uniform ferrite and banded pearlite,and grain size No. 9 as well as had satisfactory mechanical properties. After simulating post-welded heat treatment at 605 ℃ for 15 h,the plate had tensile strength of 501 MPa,yield strength of 310 MPa,elongation of40%,and impact absorbing energy above 200 J at 0 ℃,which all came up to the requirements.
SA-516 Gr. 70 plate 80 mm thick by 5 000 mm wide was successfully developed by microalloying with nickel, vanadium and niobium as well as by use of controlled rolling and normalizing in Ansteel. The mechanical properties were tested,and the microstructure was examined for the plate. The results showed that the trial-produced extra-wide extra-thick SA-516 Gr. 70 plate exhibited microstructure consisting of fine and uniform ferrite and banded pearlite,and grain size No. 9 as well as had satisfactory mechanical properties. After simulating post-welded heat treatment at 605 ℃ for 15 h,the plate had tensile strength of 501 MPa,yield strength of 310 MPa,elongation of40%,and impact absorbing energy above 200 J at 0 ℃,which all came up to the requirements.
引文
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[9]樊艳秋,马长文,隋鹤龙.模拟焊后热处理对800 MPa级水电用钢组织和性能的影响[J].金属热处理,2016,41(6):42-47.
[10]胡海洋,王永才,孙殿东,等.核电站安全壳钢衬里用20HRB钢的试制[J].轧钢,2017,34(2):67-70.
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[2]沈继刚,李宏图,王勇.浅论我国大单重特厚钢板的轧制生产技术[J].宽厚板,2011,17(2):23-26.
[3]李德发,王世森,熊玉彰,等.低碳贝氏体工程机械用Q460级厚钢板的研制[J].钢铁研究,2011,39(4):27-29.
[4]刘金泉,邵正伟,成小龙.调质高强度压力容器钢板A517GrB的研制[J].宽厚板,2011,17(6):5-8.
[5]张军,李肃龙,朱晓丽,等.高强度Q550D钢板的研制及热处理工艺优化[J].上海金属,2017,39(5):32-41.
[6]李婧,赵德文,刘相华,等. Q345E-Z35高强度特厚钢板的研制[J].轧钢,2009,26(1):14-17.
[7]苏大雄,牛长胜,陈超,等.改进型特厚正火低温容器钢板SA516 Gr. 70的开发[J].宝钢技术,2010(4):76-80.
[8]马耿魏,其其格. 610 MPa级压力容器用钢回火工艺参数的研究[J].上海金属,2011,33(2):14-17.
[9]樊艳秋,马长文,隋鹤龙.模拟焊后热处理对800 MPa级水电用钢组织和性能的影响[J].金属热处理,2016,41(6):42-47.
[10]胡海洋,王永才,孙殿东,等.核电站安全壳钢衬里用20HRB钢的试制[J].轧钢,2017,34(2):67-70.
[11]王有铭,李曼云,韦光.钢材的控制轧制和控制冷却[M].北京:冶金工业出版社,2009.