正火温度对低温压力容器钢板组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.09.019

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 110-115.DOI: 10.13251/j.issn.0254-6051.2023.09.019

正火温度对低温压力容器钢板组织与力学性能的影响

谢章龙¹, 陈家辉², 张丙军¹, 陈锋²

1.南京钢铁股份有限公司, 江苏南京 210035;
2.东南大学材料科学与工程学院, 江苏南京 211189

收稿日期:2023-05-02 修回日期:2023-08-02 出版日期:2023-09-25 发布日期:2023-10-25
作者简介:谢章龙(1980—),男,高级工程师,博士,主要研究方向为低温容器用钢铁材料研发,E-mail:xzldsy@163.com

Effect of normalizing temperature on microstructure and mechanical properties of cryogenic pressure vessel steel plate

Xie Zhanglong¹, Chen Jiahui², Zhang Bingjun¹, Chen Feng²

1. Nanjing Iron & Steel United Co., Ltd., Nanjing Jiangsu 210035, China;
2. School of Materials Science and Engineering, Southeast University, Nanjing Jiangsu 211189, China

Received:2023-05-02 Revised:2023-08-02 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 研究了正火温度对10 mm厚低温压力容器P355NL2钢板组织和力学性能的影响。结果表明,相较于热轧态,正火后铁素体晶粒细化,带状组织改善,心部贝氏体组织无明显变化,强度降低,伸长率提高,-60 ℃冲击性能大幅提高。随正火温度升高,铁素体的晶粒逐渐粗化和等轴化、体积分数减小,强度、伸长率无明显变化,低温冲击性能先升后降。综合考虑正火温度对组织性能影响规律,正火温度选择880~910 ℃可获得优异综合力学性能。

关键词: 低温容器, P355NL2钢板, 正火温度, 铁素体尺寸, 低温韧性

Abstract: Effect of normalizing temperature on microstructure and mechanical properties of a cryogenic pressure vessel P355NL2 steel plate with the thickness of 10 mm was studied. The results show that compared with that of hot-rolled, after normalizing, the ferrite grain is refined, the banded structure is improved, the bainite structure in the core has no obvious change, the strength reduces, the elongation increases, and the impact property at -60 ℃ greatly improves. With the normalizing temperature increases, the ferrite grains become coarsened and equiaxed gradually, and the volume fraction of ferrite decreases, while there is no significant change in strength and elongation, though the low-temperature impact property first increases and then decreases. Taking into account the influence of normalizing temperature on the microstructure and properties, the P355NL2 steel plate can achieve excellent comprehensive mechanical properties by selecting a normalizing temperature of 880-910 ℃.

Key words: cryogenic vessel, P355NL2 steel plate, normalizing temperature, ferrite grain size, low temperature toughness

中图分类号:

TG142.1

谢章龙, 陈家辉, 张丙军, 陈锋. 正火温度对低温压力容器钢板组织与力学性能的影响[J]. 金属热处理, 2023, 48(9): 110-115.

Xie Zhanglong, Chen Jiahui, Zhang Bingjun, Chen Feng. Effect of normalizing temperature on microstructure and mechanical properties of cryogenic pressure vessel steel plate[J]. Heat Treatment of Metals, 2023, 48(9): 110-115.

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正火温度对低温压力容器钢板组织与力学性能的影响

Effect of normalizing temperature on microstructure and mechanical properties of cryogenic pressure vessel steel plate

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