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 ›› 2024, Vol. 45 ›› Issue (6): 8-11.DOI: 10.20057/j.1003-8620.2024-00075

• • 上一篇    下一篇

紧固件用10.9级32CrB4调质圆钢的开发

彭峰1,2, 李旭1, 李博鹏1,2, 张越1,2, 王占忠1,2, 郭士北1,2   

  1. (1 大冶特殊钢有限公司,黄石 435001;2 高品质特殊钢湖北省重点实验室,黄石 435001)
  • 收稿日期:2024-03-29 出版日期:2024-11-30 发布日期:2024-12-01
  • 作者简介:彭峰(1984—),男,硕士,工程师

Development of 10.9 Grade 32CrB4 Quenched and Tempered Round Steel for Fasteners

Peng Feng1,2, Li Xu1, Li Bopeng1,2, Zhang Yue1,2, Wang Zhanzhong1,2, Guo Shibei1,2   

  1. (1 Daye Special Steel Co.,Ltd., Huangshi 435001,China;2 Hubei Provincial Key Laboratory of High-quality Special Steel, Huangshi 435001,China)
  • Received:2024-03-29 Published:2024-11-30 Online:2024-12-01

摘要: 通过冶炼过程控制残余w[P]≤0.015%、w[S]≤0.010%,低氧操作稳定控制w[T.O]<10×10-6,采用两阶段低温轧制且单道次压下率控制为8%~12%,成功开发出38.8 mm规格具有良好-40 ℃低温冲击韧性的10.9级32CrB4螺栓钢。力学性能检验和金相组织观察结果表明,所开发的钢材具有良好的拉伸性能和优良的低温冲击性能,研究出较优热处理工艺为820 ℃保温水淬后510 ℃保温回火,室温抗拉强度可达1 075 MPa,-40 ℃ KV2低温冲击平均值可达到53 J,组织以回火索氏体为主,综合力学性能优良,组织均匀性较好。

关键词: 紧固件用钢, 热轧棒材, 热处理工艺, 低温冲击, 32CrB4钢

Abstract: There is an urgent need to develop low-cost, high-strength, and toughness grades of steel for domestic wind power fasteners in order to enhance the competitiveness of the industrial chain and fully participate in market competition. Through the control of smelting process to assure residual w [P]≤0.015% and w[S]≤ 0.010% and the total oxygen content w[T.O] stably controlled to be less than 10 × 10-6 during low oxygen operation practice. Two stage low-temperature rolling is adopted and the single pass reduction rate is controlled between 8% to 12%. A 10.9-grade 32CrB4 bolt steel with good impact toughness at -40 ℃ low-temperature for 38.8 mm specification has been successfully developed. The results of mechanical property inspection and metallographic observation indicate that the developed steel has good tensile properties and excellent low-temperature impact properties. The optimal heat treatment process has been studied, which is 820 ℃ soaking water quenching and 510 ℃ soaking tempering. The room temperature tensile strength can reach 1 075 MPa, and the average low-temperature impact value of -40 ℃ KV2 can be 53 J. The microstructure is mainly tempered martensite, with excellent and comprehensive mechanical properties and good uniformity.

Key words:  , Steel for Fasteners; Hot Rolled Bars; Heat Treatment Process; Low-temperature Impact; 32CrB4

中图分类号: