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 (2): 33-36.DOI: 10.20057/j.1003-8620.2022-00075

• 工艺技术 • 上一篇    下一篇

高强度螺栓用35CrMo免退火冷镦钢热轧盘条的研制

王海华,郑晓伟,张剑锋,林再勇,孔祥伟   

  1. 江阴兴澄特种钢铁有限公司线材研究所,江阴 214429
  • 收稿日期:2022-06-29 出版日期:2023-04-01 发布日期:2023-03-27
  • 作者简介:王海华(1988-),男,硕士,工程师;E-mail:wanghaihua@citicsteel.com

Development of Hot-Rolled Wire Rods of 35CrMo Annealing-Free Cold Heading Steel for High-Strength Bolts

Wang Haihua , Zheng Xiaowei , Zhang Jianfeng , Lin Zaiyong , Kong Xiangwei   

  1. Wire Rod Research Institute,Jiangyin Xingcheng Special Steel Co.,Ltd., Jiangyin 214429
  • Received:2022-06-29 Published:2023-04-01 Online:2023-03-27

摘要: 通过入减定径温度780℃,入减定径减面率42%(φ18.4 mm→ φ14 mm),冷却速度0.42℃/s,35CrMo钢热轧材显微组织为F+P, 铁素体含量≥40%,实际晶粒度10~11级,抗拉强度≤750 MPa,断面收缩率≥60%,硬度值214~225HV, 实现免退火直接进行大减面率拉拔。

关键词: 35CrMo冷镦钢, 热轧盘条, 控轧控冷, 免退火

Abstract: By controlling billet temperature 780 ℃ as entering sizing mill,sizing reducing rate 42% (φ18.4 mm→ φ14 mm),cooling rate 0.42 ℃/s,the microstructure of 35CrMo steel hot-rolled rod is F+P,with ferrite content more than 40%,actual grain size 10- 11,tensile strength 750 MPa,reduction of area≥60%,and hardness value 214-225HV, to realize annealing-free large reduction of cross-sectional area cold drawing.

Key words: 35CrMo Cold Heading Steel , Hot Rolled Wire Rods , Controlled Rolling and Controlled Cooling , Annealing-Free