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 ›› 2015, Vol. 36 ›› Issue (5): 64-66.

• 组织和性能 • 上一篇    

热轧线材中心偏析对油淬回火55SiCrA弹簧钢力学性能的影响

孟耀青1,2，郑永瑞1,2，李拥军3，赵昊乾1,2，王伟1,2   

  1. 1. 邢台钢铁有限责任公司技术中心，邢台054027 ；
    2. 河北省线材工程技术研究中心，邢台054027；
    3. 邢台钢铁有限责任公司炼钢厂，邢台054027；
  • 收稿日期:2015-05-13 出版日期:2015-10-01 发布日期:2022-08-16
  • 作者简介:孟耀青(1986-)，男，硕士(2012年北京科技大学)，工程师，2008年武汉科技大学(本科)毕业，弹簧钢产品研发、工艺研 究和技术管理。

Effect of Center Segregation of Hot-Rolled Rod on Mechanical Properties of Oil-Quenched and Tempered Spring Steel 55SiCrA

Meng Yaoqing1,2 , Zheng Yongrui1,2 , Li Yongjun3 , Zhao Haoqian1,2 , Wang Wei1,2   

  1. 1. Technology Center, Xingtai Iron and Steel Co Ltd, Xingtai 054027 ；
    2. Hebei Engineering Research Center for Wire Rod, Xingtai 054027 ；
    3. Steelmaking Plant, Xingtai Iron and Steel Co Ltd, Xingtai 054027；
  • Received:2015-05-13 Published:2015-10-01 Online:2022-08-16

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摘要： Φ22 mm油淬回火（890℃ 300 s油淬,530℃ 1200 S回火）55SiCrA弹簧钢丝（/%:0.55C,1.45Si,0.67Mn,0.010P,0.005S,0.68Cr）的生产流程为铁水脱硫-80 t顶底复吹转炉-LF-RH-280 mm×325 mm方坯连铸-Φ22 mm轧材。试验结果表明,55SiCrA钢Φ22 mm轧材的中心偏析为3级,中心处碳含量不均匀为0.50%~0.60%C,半径1/2处的碳含量为0.54%;中心处试样抗拉强度1430~1455 MPa,断面收缩率39%~40%,半径1/2处抗拉强度1470~1480 MPa,断面收缩率43.0%~45.5%,严重的中心碳偏析（3级）使油淬回火55SiCrA弹簧钢的力学性能明显降低。

关键词: 弹簧钢55SiCrA, 中心碳偏析, 油淬回火, 力学性能

Abstract: The production flowsheet of oil-quenched at 890 ℃ for 300 s and tempered at 530℃ for 1200 s Φ22 mm rod of spring steel 55SiCrA (/% : 0.55C, 1.45Si, 0.67Mn, 0.010P, 0.005S, 0.68Cr) is hot metal desulphurization- 80 t top and bottom combined blowing converter- LF- RH- 280 mm x 325 mm bloom casting-Φ22 mm rolling products. Examination results show that the center segregation rating of Φ22 mm rolled products of steel 55SiCrA is 3 , the carbon content at center of rod is non-homogeneous i. e. 0.50%-0.60% C, and the carbon content at 1/2 radius of rod is 0.54% ; of steel specimen at center the tensile strength is 1430-1455 MPa and the reduction o£ area is 39%-40% , while of steel specimen at 1/2 radius of rod the tensile strength is 1470-1480 MPa and the reduction of area is 43.0%-45.5% , the serious center segregation ( rating 3) leads to obvious decrease of mechanical properties of oil-quenched and tempered spring steel 55SiCrA.

Key words: Spring Steel 55SiCrA, Center Carbon Segregation, Oil-Quenching and Tempering, Mechanical Properties

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