金属热处理 ›› 2021, Vol. 46 ›› Issue (7): 182-186.DOI: 10.13251/j.issn.0254-6051.2021.07.035

• 工艺研究 • 上一篇    下一篇

高强高韧钢Q960E的生产工艺

李灿明   

  1. 山东钢铁集团日照有限公司, 山东 日照 276800
  • 收稿日期:2021-02-14 出版日期:2021-07-25 发布日期:2021-12-10
  • 作者简介:李灿明(1979—),男,高级工程师,硕士,主要研究方向为钢铁产品和工艺开发,E-mail:axian9024@126.com。

Production process of Q960E high strength and high toughness steel

Li Canming   

  1. Shandong Iron and Steel Group Rizhao Co., Ltd., Rizhao Shandong 276800, China
  • Received:2021-02-14 Online:2021-07-25 Published:2021-12-10

摘要: 采用中低碳微量添加Nb、V、Cr、Mo、Cu、Ni等合金元素成分设计思路,通过对Q960E钢板相变点、静态CCT曲线测定,详细研究钢板淬火后经不同回火工艺的微观组织和力学性能。结果表明:当冷速为0.1~1 ℃/s时,组织主要为铁素体+粒状贝氏体,随冷却速度增加,铁素体转变受到抑制,逐渐向贝氏体和马氏体转变,当冷速大于10 ℃/s时,组织全部为马氏体。淬火钢板经150、180、210 ℃回火后,随回火温度升高,强度不断下降,塑性增加,韧性呈先升后降,180 ℃回火时综合性能最佳匹配,屈服强度1050 MPa、抗拉强度1140 MPa、断后伸长率11.0%、-40 ℃KV2单值60 J以上。

关键词: Q960E钢, 高强钢, 高韧钢

Abstract: Microstructure and mechanical properties of the Q960E steel plate after quenching and different tempering processes were studied in detail through the determination of phase transformation point and static CCT curve by using the design idea of low and medium carbon,multi-alloyed by Nb, V, Cr, Mo, Cu, Ni and other trace elements alloying composition. The results show that when the cooling rate is 0.1-1 ℃/s, the microstructure is mainly ferrite + granular bainite. With the increase of cooling rate, the transformation of ferrite is restrained and gradually transforms to bainite and martensite. When cooling rate is greater than 10 ℃/s, microstructure is all martensite. After tempering at 150 ℃, 180 ℃ and 210 ℃,respectively, the strength of quenched steel plate increases with the tempering temperature, strength decreases continuously, the plasticity increases, the toughness increases first and then decreases. The comprehensive performance of the steel plate tempered at 180 ℃ is the best match, with yield strength of 1050 MPa, tensile strength of 1140 MPa, elongation after fracture of 11.0%, and KV2 at -40 ℃ above 60 J.

Key words: Q960E steel, high strength steel, high toughness steel

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