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 ›› 2015, Vol. 36 ›› Issue (1): 52-55.

• 组织和性能 • 上一篇    下一篇

高压锅炉用12Cr2Mo高强韧406 mmx40.5 mm钢管的热处理、组织和性能

张志成1, 李永灯1, 阮玲慧2, 吴开明2   

  1. 1湖北新冶钢有限公司产品研究所,黄石435001;
    2武汉科技大学国际钢铁研究院,武汉430081
  • 收稿日期:2014-08-11 出版日期:2015-02-01 发布日期:2022-08-30
  • 作者简介:张志成(1970-),男,高级工程师,1992年武汉科技大学(本科)毕业,特殊钢新品种新材料研发、技术质量研究及管理。
  • 基金资助:
    湖北省重点新产品新工艺研究开发项目资助 (2012BAA14005)

Heat Treatment, Structure and Properties of High-Strength-Toughness Steel 12Cr2Mo 406 mm x 40.5 nun Tube for High Pressure Boiler

Zhang Zhicheng1,  Li Yongdeng1,  Ruan Linghui1,  Wu Kaiming2   

  1. 1 Products R&D Institute, Hubei Xinyegang Steel Co Ltd, Huangshi 435001;
    2 International Research Institute for Iron and Steel, Wuhan University of Science and Technology, Wuhan 430081
  • Received:2014-08-11 Published:2015-02-01 Online:2022-08-30

摘要: 试验用12Cr2Mo(/%:0.09C,0.30Si,0.34Mn,0.007P,0.006S,2.10Cr,0.93Mo,0.014Al)406 mm×40.5 mm钢管的生产流程为120tBOF-LF-RH-410mm×530mm连铸-锻制∞90mm管坯-460mmASSEL机组轧制成管。采用JMatPro软件计算实验用钢平衡相转变图,得出12Cr2Mo钢相变点Ac3为862℃,Ac1为781℃,并对910℃正火,700℃回火处理的试验钢进行组织和力学性能检验。结果表明,试验12Cr2Mo钢正火-回火后的基体组织为贝氏体+少量铁素体,同时大量不规则的M23C6碳化物在晶界和晶内析出,少量颗粒状的M6C碳化物沿晶界析出,大量细小针状的Mo2C碳化物在晶内析出,该钢力学性能优良-强度Rel515~520 MPa,Rm640~650 MPa,塑性A 22%~25%,Z 76%~80%,以及-60℃冲击功AKv 268~293 J。

关键词: 高压锅炉用钢12Cr2Mo, 热处理, 组织, 合金碳化物, 力学性能

Abstract: The production flow sheet for test steel 12Cr2Mo (/%: 0.09C, 0. 30Si, 0. 34Mn, 0.007P, 0. 006S, 2, 10Cr, 0. 93Mo, 0. 014A1) 406 mm x 40.5 mm tube is 120 t BOF-LF-RH-410 mm x 530 mm bloom casting-forging to 0390 mm tube stock-460 mm ASSEL mill rolling to tube. With using JMatPro software to calculate phase equilibrium diagram of test steel, it is obtained that the steel 12Cr2Mo phase transition point Ac3 is 862 ℃; and the Ac1 is 781 °C, and the examination on structure and mechanical properties of test steel normalizing-heat-treated at 910 °C and tempered at 700 ℃ has been carried out. Results show that the matrix structure of normalized-tempered test steel 12Cr2Mo is bainite + minor ferrite, and a large amount of irregular M23Cprecipitate at grain boundary and in intragranular, a small amount granular M6C carbides precipitate along grain boundary and a large amount fine pin-like Mo2C carbides precipitate in intragranular, and the mechanical properties of steel is excellent- strength /Rel 515 ~520 MPa and Rm 640 ~650 MPa, plasticity A 22% ~ 25% and Z 76% 80% , and impact energy at -60 TJ AKV 268 ~293 J.