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 ›› 2010, Vol. 31 ›› Issue (3): 50-53.

• 组织和性能 • 上一篇    下一篇

含铜管线钢X70针状铁素体组织的产生及影响因素

杨瑞成,张安明   

  1. 兰州理工大学甘肃先进有色金属新材料国家重点实验室,兰州730050
  • 收稿日期:2009-12-13 出版日期:2010-06-01 发布日期:2022-11-07
  • 作者简介:杨瑞成(1946-),男,教授,博士导师,材料微观结构性能研究和新材料开发。

Formation of Acicular Ferrite Structure of Pipeline Steel X70 Containing Niobium and Affecting Factors

Yang Ruicheng , Zhang Anming   

  1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050
  • Received:2009-12-13 Published:2010-06-01 Online:2022-11-07

摘要: 测试和分析了由150 mm铸坯连轧成14.6 mm微合金化管线钢X70(%:0.04C、1.54Mn、0.05Nb、0.04V、0.01Ti、0.003 9N)的力学性能和显微组织。结果表明,通过加入微量Nb与开坯后≤950℃进行变形量≥70%的控制轧制,终轧800℃并以20~30℃/s冷至500~550℃,管线钢X70的室温组织为典型的针状铁素体,晶粒尺寸2~5μm,具有良好的综合力学性能,即σ0.5≥565 MPa,σb≥655 MPa,Cv(-20℃)≥212 J。

关键词: X70, 控制轧制, 针状铁素体, 金属强化

Abstract: The mechanical properties and micro structure of microalloying pipeline steel X70 ( % :0. 04C, 1. 54Mn, 0. 05Nb, 0. 04V, 0. 01Ti, 0.003 9N) of 14. 6 mm sheet continuous rolled from 150 mm casting slab have been tested and analyzed. Results show that with adding micro niobium and after breakdown with control rolling by deformation N70% at ≤950 °C , finishing rolling at 800 ℃ , then cooling to 500 -550 °C with 20 ~30 ℃/s, the structure of X70 pipeline steel at ambient temperature is typical acicular ferrite with grain size 2 ~ 5 μm, which has excellent comprehensive mechanical properties i. e. σ0.5≥565 MPa, σb≥655 MPa and Cv at -20℃≥212 J.

Key words: X70, Control-Rolling, Acicular Ferrite, Metal Strengthening