ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2023, Vol. 44 ›› Issue (4): 102-107.DOI: 10.20057/j.1003-8620.2023-00043

所属专题: 无缝钢管

• 成型与相变 • 上一篇    下一篇

12Cr1MoVG厚壁钢管高温正火+回火的组织和性能

张银桥1,2, 孔繁革1,2, 张继宏1,2, 王煜3, 朱志宝1,2, 李勇1,2, 李海松1,2   

  1. 1 大冶特殊钢有限公司钢管研究所,黄石435001;
    2 高品质特殊钢湖北省重点实验室,黄石435001;
    3 上海锅炉厂有限公司,上海200245
  • 收稿日期:2023-03-21 出版日期:2023-08-01 发布日期:2023-07-14
  • 作者简介:张银桥(1984-),男,工程师

Microstructure and Properties of 12Cr1MoVG Thick-wall Steel Pipe with High Temperature Normalizing + Tempering

Zhang Yinqiao1,2, Kong Fange1,2, Zhang Jihong1,2, Wang Yu3, Zhu Zhibao1,2, Li Yong1,2, Li Haisong1,2   

  1. 1 Steel Pipe Products Institute , Daye Special steel Co., Ltd., Huangshi 435001, China;
    2 Hubei Province Key Laboratory for High Quality Special Steel , Huangshi 435001, China;
    3 Shanghai Boiler Works Co.,Ltd., Shanghai 200245, China
  • Received:2023-03-21 Published:2023-08-01 Online:2023-07-14

摘要: 通过显微组织观察和室温拉伸试验、室温冲击试验、硬度试验和高温持久性能试验,研究了Φ457 mm×70 mm 12Cr1MoVG(/%:0.13C,0.21Si,0.56Mn,1.07Cr,0.31Mo,0.20V,0.008P,0.004S,0.02Ni,0.004Cu,0.012 4Al)钢管在1 000 ℃正火后采用水雾加速冷却和740 ℃回火的组织和性能。结果表明:显微组织为铁素体+贝氏体,贝氏体量约占65%,晶粒度7~5级;屈服强度为416 MPa,抗拉强度为575 MPa,室温冲击功为206~244 J,布氏硬度187HBW;575 ℃×105 h持久强度为86 MPa;575 ℃/100 MPa持久51 480 h未断;575 ℃/120 MPa持久27 198 h断裂,试样开裂起源于晶界蠕变孔洞,周边贝氏体基体没有发现严重的球化等现象,组织稳定性优异。

关键词: 12Cr1MoVG厚壁钢管, 组织与性能控制, 贝氏体, 高温持久强度

Abstract: Microstructure and properties of Φ457 mm×70 mm 12Cr1MoVG steel pipe (/% : 0.13C, 0.21Si, 0.56Mn, 1.07Cr, 0.31Mo, 0.20V, 0.008P, 0.004S, 0.02Ni, 0.004Cu, 0.012 4Al) after 1 000 ℃ normalizing plus using water mist accelerated cooling and 740 ℃ tempering were studied by means of microstructure observation, tensile test , impact test at room temperature, hardness test and high temperature durability test. The results showed that the microstructure consisted of ferrite and bainite, with the volume of bainite accounting for 65%, and the grain size of 7-5 grade. Yield strength was 416 MPa, tensile strength was 575 MPa, impact energy at room temperature was 206-244 J, brinell hardness was 187HBW. The endurance strength under 575 ℃×105 h was 86 MPa. It lasted 51 480 hours at 575 ℃/100 MPa unbroken. After 27 198 hours, it cracked under 575 ℃/120 MPa, and the crack originated from grain boundary creep pores, no serious spheroidization was found in the bainite matrix surrounding. The structure stability was excellent.

Key words: 12Cr1MoVG Steel Pipe with Thick-wall, Microstructure and Properties Control, Bainite, High Temperature Endurance Strength

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