金属热处理 ›› 2023, Vol. 48 ›› Issue (8): 42-46.DOI: 10.13251/j.issn.0254-6051.2023.08.007

• 材料研究 • 上一篇    下一篇

4330-Nb抽油杆用钢的连续冷却转变特性分析

孙晓冉1,2, 王程明2, 赵楠2, 白丽娟2, 郑文跃1   

  1. 1.北京科技大学 国家材料服役安全科学中心, 北京 100083;
    2.河钢材料技术研究院, 河北 石家庄 050000
  • 收稿日期:2023-03-25 修回日期:2023-06-30 出版日期:2023-08-25 发布日期:2023-10-10
  • 通讯作者: 郑文跃,教授,E-mail: zheng_wenyueHB@163. com
  • 作者简介:孙晓冉(1983—),女,高级工程师,硕士,主要研究方向为金属材料物理检测,E-mail: ragyy@126.com。
  • 基金资助:
    河钢-北科大平台项目

Analysis of continuous cooling transformation characteristics of 4330-Nb steel for sucker rod

Sun Xiaoran1,2, Wang Chengming2, Zhao Nan2, Bai Lijuan2, Zheng Wenyue1   

  1. 1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
    2. HBIS Material Technology Research Institute, Shijiazhuang Hebei 050000, China
  • Received:2023-03-25 Revised:2023-06-30 Online:2023-08-25 Published:2023-10-10

摘要: 采用静态CCT曲线,结合金相、硬度表征方法,研究了4330-Nb抽油杆用钢过冷奥氏体连续冷却转变特性。结果表明,4330-Nb抽油杆用钢在连续冷却过程中,CCT曲线呈现3个转变区,各自独立、互不连接,高温转变区较小,主要是Nb、Cr、Ni、Mn等多种合金元素综合作用的结果。硬度随冷速增加呈现上升段至平稳段的变化趋势,与微观组织变化趋势相吻合。当冷速<0.2 ℃/s时,微观组织呈现带状分布,主要跟缓冷和C、Si、Mn、Cr、Ni等元素的带状偏聚有关。因此,4330-Nb抽油杆用钢想要获取均匀的微观组织,热轧后冷却阶段宜选择快冷方式,生产上可采用调质工艺来获取优良的性能。

关键词: 4330-Nb抽油杆用钢, CCT曲线, 硬度, 微观组织

Abstract: Continuous cooling characteristics of undercooled austenite for 4330-Nb steel for sucker rod were studied by using static CCT curves, microstructure and hardness tests. The results show that the CCT curves of the steel presents three transformation zones independent and unconnected to each other during the continuous cooling process. The high temperature transformation zone is small, which is the result of the comprehensive action of Nb, Cr, Ni, Mn and other alloying elements. With the increase of cooling rate, the change of hardness shows a trend of raising segment to stable segment, which is consistent with the trend of microstructure. The important reason for the formation of banded structure when the cooling rate is less than 0.2 ℃/s is the low cooling rate and the banded segregation of C, Si, Mn, Cr, Ni and other elements. Therefore, in order to obtain a uniform microstructure for the 4330-Nb sucker rod steel, the fast cooling method should be selected during the cooling stage after hot rolling. In production, the quenching and tempering process can be used to obtain excellent performance.

Key words: 4330-Nb steel for sucker rod, CCT curves, hardness, microstructure

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