ISSN：1003-8620

CN：42-1243/TF

Governed by: CITIC Pacific Special Steel Group Co., LTD

Sponsored by: Daye Special Steel Co., LTD.

Special Steel ›› 2012, Vol. 33 ›› Issue (3): 44-46.

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Continuous Cooling Transformation Curves of Steel 30CrMo Produced by Thin Slab Casting and Rolling Process and Its Application

Mao Xinping1,2 ， Xie Liqun3   

  1. 1 Guangzhou Zhujiang Iron and Steel Co Ltd, Guangzhou 510730；
    2 Faculty of Materials Science and Metallurgy, Wuhan University of Science and Technology, 430081;
    3 Thin Slab Casting and Rolling Research Institute, Technology Center, Guangzhou Iron and Steel Group, Guangzhou 510730
  • Received:2011-11-26 Online:2012-06-01 Published:2022-10-13

薄板坯连铸连轧30CrMo钢的连续冷却转变(CCT)曲线和应用

毛新平1,2，谢利群3   

  1. 1广州珠江钢铁有限责任公司，广州510730；
    2武汉科技大学材料科学与冶金工程学院，武汉430081 ；
    3广钢集团技术中心薄板坯连铸连轧技术研究所，广州510730
  • 作者简介:毛新平(1965-),男，博士，教授级高级工程师，钢铁材料研究。
  • 基金资助:
    2010年广东省重大专项：先进汽车结构用钢共性技 术研究及产业化(2010A080407003)

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Abstract: The continuous cooling transformation ( CCT) curves with cooling rate 0. 03 ~ 15. 60 T/s of Steel 30CrMo (/% : 0. 32C, 0. 20Si, 0. 60Mn, 0. 20Ni, 0. 97Cr, 0. 18Mo) 6 mm plate continuous-rolled by 56 mm thin slab are measured by using dilatation method and the microstructure of steel with different cooling rate is observed to get the phase transformation point of steel 30CrMo- Ac3 = 800 ℃ , Act =735 °C , Bs =510 ℃, Ms = 340 °C and Mf = 220 ℃. Application results show that the cooling rate of 6 mm plate after coiling is ≤0. 06 ℃ , as coiling temperature is 610 ~640 ℃，the structure of steel 30CrMo is ferrite + pearlite, it is available to avoid forming bainite structure that leads to obvious increase of strength of steel and deterioration of plasticity of steel.

Key words: Steel 30CrMo, Thin Slab Casting and Rolling, CCT Curves, Coiling Temperature

摘要： 采用膨胀法测定了56 mm薄板坯连轧成6 mm板的30CrMo钢(/%:0.32C、0.20Si、0.60Mn、0.20Ni、0.97Cr、0.18Mo)在0.03～15.60℃/s冷却速率下的连续冷却转变(CCT)曲线并观察了各冷却速率下的显微组织。得出30CrMo钢的相变临界点Ac3=800℃,Ac1=735℃,Bs=510℃,Ms=340℃,Mf=220℃。应用结果表明,30CrMo钢6 mm板卷取后的空冷的冷却速率≤0.06℃/s,当卷取温度为610～640℃时获得铁素体+珠光体组织,避免贝氏体形成导致强度显著升高和塑性变差。

关键词: 30CrMo钢, 薄板坯连铸连轧, CCT曲线, 卷取温度

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