长期服役12Cr1MoVG钢补焊粗晶区SH-CCT曲线的测定

doi:10.13251/j.issn.0254-6051.2025.07.030

金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 212-217.DOI: 10.13251/j.issn.0254-6051.2025.07.030

长期服役12Cr1MoVG钢补焊粗晶区SH-CCT曲线的测定

罗建科¹, 杜佼伟^1,2, 李霄², 吕品正¹, 薛海洋², 张正华², 肖世俊²

1.陕西君创智盈能源科技有限公司, 陕西西安 710016;
2.西安石油大学材料科学与工程学院, 陕西西安 710065

收稿日期:2024-12-23 修回日期:2025-04-23 出版日期:2025-07-25 发布日期:2025-07-28
通讯作者: 杜佼伟,工程师,硕士,E-mail:dujiaowei01@163.com
作者简介:罗建科(1969—),男,高级工程师,硕士,主要研究方向为电力工程,E-mail:ljk2387@163.com。

Determination of SH-CCT curve in welded coarse-grained zone of 12Cr1MoVG steel after long-term service

Luo Jianke¹, Du Jiaowei^1,2, Li Xiao², Lü Pinzheng¹, Xue Haiyang², Zhang Zhenghua², Xiao Shijun²

1. Shaanxi Junchuang Zhiying Energy Technology Co., Ltd., Xi'an, Shaanxi 710016, China;
2. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

Received:2024-12-23 Revised:2025-04-23 Online:2025-07-25 Published:2025-07-28

摘要/Abstract

摘要： 对某电厂运行约1.8×10⁵ h的12Cr1MoVG钢主蒸汽管道进行焊接热模拟试验。通过对其焊接粗晶区微观组织与硬度的研究,绘制了SH-CCT曲线。结果表明:当冷却速度为0.1~0.3 ℃/s时,12Cr1MoVG钢的显微组织为铁素体+珠光体+少量贝氏体;当冷却速率上升至0.5 ℃/s时,组织为较多的贝氏体和较少量的铁素体;当冷却速率为1~5 ℃/s时,组织主要为粒状贝氏体;当冷却速率达到7 ℃/s以上时,组织多为板条贝氏体;当冷却速率为60 ℃/s时,组织为板条马氏体和少量的贝氏体。随着冷却速率的不断增加,12Cr1MoVG钢的显微硬度不断上升,在冷却速率为60 ℃/s时最高,为406.5 HV0.2。

关键词: 12Cr1MoVG钢, 粗晶区, 硬度, SH-CCT曲线

Abstract: A welding thermal simulation test was conducted on a 12Cr1MoVG reheated steam pipeline running for approximately 1.8×10⁵ h in a power plant. The SH-CCT curve was drawn by studying the microstructure and hardness of the welded coarse-grained zone. The results indicate that when the cooling rate is in the range of 0.1-0.3 ℃/s, the microstructure of the 12Cr1MoVG steel mainly consists of ferrite, pearlite and a small amount of bainite. When the cooling rate rises to 0.5 ℃/s, the microstructure consists of more bainite and less ferrite. When the cooling rate is in the range of 1-5 ℃/s, the microstructure is mainly composed of granular bainite. When the cooling rate is above 7 ℃/s, the microstructure is mostly lamellar bainite. When the cooling rate is 60 ℃/s, the microstructure is lath martensite and a small amount of bainite. With the continuous increase of cooling rate, the microhardness of the 12Cr1MoVG steel continues to rise, reaching the maximum value of 406.5 HV0.2 at the cooling rate of 60 ℃/s.

Key words: 12Cr1MoVG steel, coarse-grained region, hardness, SH-CCT curve

中图分类号:

TG156

罗建科, 杜佼伟, 李霄, 吕品正, 薛海洋, 张正华, 肖世俊. 长期服役12Cr1MoVG钢补焊粗晶区SH-CCT曲线的测定[J]. 金属热处理, 2025, 50(7): 212-217.

Luo Jianke, Du Jiaowei, Li Xiao, Lü Pinzheng, Xue Haiyang, Zhang Zhenghua, Xiao Shijun. Determination of SH-CCT curve in welded coarse-grained zone of 12Cr1MoVG steel after long-term service[J]. Heat Treatment of Metals, 2025, 50(7): 212-217.

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长期服役12Cr1MoVG钢补焊粗晶区SH-CCT曲线的测定

Determination of SH-CCT curve in welded coarse-grained zone of 12Cr1MoVG steel after long-term service

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