金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 36-40.DOI: 10.13251/j.issn.0254-6051.2021.06.008

• 工艺研究 • 上一篇    下一篇

原始组织和退火工艺对高碳精冲钢SK85球化效果的影响

刘坚锋1,2, 喻建林2, 葛启录1, 仇圣桃1, 唐小勇2   

  1. 1.钢铁研究总院 连铸技术国家工程技术中心, 北京 100081;
    2.新余钢铁股份有限公司, 江西 新余 338001
  • 收稿日期:2021-02-01 出版日期:2021-06-25 发布日期:2021-07-21
  • 通讯作者: 喻建林,高级工程师,硕士,E-mail: yujianlin0612@163.com
  • 作者简介:刘坚锋(1985—),男,高级工程师,主要研究方向为轧钢工艺,E-mail:ljf@xinsteel.com.cn。
  • 基金资助:
    2019年江西省“双千计划”项目

Effect of original microstructure and annealing process on spheroidizing effect of high carbon fine blanking steel SK85

Liu Jianfeng1,2, Yu Jianlin2, Ge Qilu1, Qiu Shengtao1, Tang Xiaoyong2   

  1. 1. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China;
    2. Xinyu Iron and Steel Group Co., Ltd., Xinyu Jiangxi 338001, China
  • Received:2021-02-01 Online:2021-06-25 Published:2021-07-21

摘要: 针对终端市场提出高碳精冲钢SK85球化率控制在90%以上的质量需求,开展了试验检测分析,找出了影响SK85球化效果的重要因素。结果表明:原始组织和球化退火工艺均是影响球化效果的重要因素,热轧采用低温卷取,退火前原始组织片层间距更短,组织更细小,球化倾向性更好;当球化温度在Ac1~Ac3之间,碳原子充分扩散,片状渗碳体溶解成粒状,球化效果最佳。通过分析获得了高碳精冲钢SK85合适的工艺参数,保证了工业生产线上试用所得球化率在90%以上,精冲性能良好,得到用户认可。

关键词: SK85钢, 原始组织, 球化退火, 球化率, 精冲性能

Abstract: Aiming at the quality requirement of controlling the spheroidization rate of high carbon fine blanking steel SK85 above 90% in the end market, the important factors affecting the spheroidization effect of SK85 were found out through test and analysis. The results show that both of the original microstructure and the spheroidizing annealing process are the important factors affecting spheroidizing effect. Adopting hot rolling by low temperature coiling can result in finer microstructure with smaller lamellar spacing before annealing, and the spheroidizing tendency is better. When the spheroidizing annealing temperature is between Ac1-Ac3, the carbon atoms are fully diffused, and the lamellar cementite dissolves into spherules, so the spheroidizing effect is the best. The suitable process parameters for high carbon fine blanking steel SK85 so obtained ensures on the industrial production line the spheroidization rate of over 90% and good fine blanking property, which has been already recognized by users.

Key words: SK85 steel, original microstructure, spheroidization annealing, spheroidizing rate, fine blanking property

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