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 ›› 2022, Vol. 43 ›› Issue (6): 89-94.DOI: 10.20057/j.1003-8620.2022-00109

• 工艺技术 • 上一篇    下一篇

紧固件用SA-540合金钢的强韧化工艺研究

王兆英1,2,3,吴畏1,2,3,赵振1,2,3,罗文韬1,3,宋金辉1,3,喻峰1,3   

  1. 1重庆材料研究院有限公司,重庆400707;
    2国家仪表功能材料工程技术研究中心, 重庆400707;
    3耐腐蚀合金重庆市重点实验室,重庆400707
  • 收稿日期:2022-09-03 出版日期:2022-12-01 发布日期:2022-11-21
  • 作者简介:王兆英(1975-),女,工程师

Strengthening and Toughening of SA-540 Alloy Steel for Fasteners

Wang Zhaoying1,2,3,Wu Weil1,2,3,ZhaoZhen1,2,3,Luo Wentao1,3,Song Jinhui1,3,Yu Feng1,3   

  1. 1 Chongqing Materials Research Institute Co.,Ltd.,Chongqing 400707;
    2 National Engineering Research Center for Instrument Functional Materials,Chongqing 400707;
    3 Chongqing Key Laboratory of Corrosion-resistant Alloys, Chongqing 400707
  • Received:2022-09-03 Published:2022-12-01 Online:2022-11-21

摘要: 通过成分优化(/%:0.35~0.46C,0.6~1.0Cr, 1.50~2.05Ni, 0.18~0.32Mo, 0.1V)、冶炼工艺(3 t VIM+ESR)以及热处理工艺(再次热处理工艺:850℃2 h水冷+590℃5 h水冷)的合理制定,获得了满足指标要求的紧固件用高强高韧SA-540合金钢材料。结果表明,为确保SA-540合金钢高温300℃规定塑性延伸强度Rp0.2≥860 MPa,室温抗拉强度应控制在1150~1170 MPa,仅有20 MPa的强度范围。对于经850℃2 h淬火/水冷+560℃5 h回火/水冷调质处理后室温抗拉强度超标的紧固件,可再次通过重新淬火并提高回火热处理温度(850℃2 h淬火/水冷+590℃5 h回火/水冷)使合金钢拉伸性能满足指标要求。SA-540合金钢淬火后随回火的温度升高,呈现抗拉强度和屈服强度下降、伸长率和断面收缩率增加的变化趋势。添加0.1%V的SA-540合金钢,可明显提高合金钢的强度和塑性指标,但低温冲击性能降低明显。

关键词: SA-540合金钢, 紧固件, 热处理, 拉伸性能

Abstract: In this paper,the SA-540 high strength and high toughness steel for fasteners is obtained by the optimization of composition(/%:0.35-0.46C,0.6-1.0Cr,1.50-2.05Ni,0. 18-0.32Mo,0. 1V),the reasonable formulation of smelting process(3t VIM+ ESR)and heat treatment process(re-heat treated at 850 ℃ for2 h water cooling+590 ℃ for 5 h water cooling). The results show that in order to ensure the specified plastic elongation strength Rp0.2≥860 MPa of SA-540 steel at 300 ℃,the tensile strength at room temperature should be controlled in the range of 1150- 1170 MPa, with only a strength window of 20 MPa. For the materials whose tensile strength at room temperature exceeds the standard after quenching at 850℃ for 2 h/water cooling +tempering at 560℃ for 5h/water cooling, the tensile properties of the alloy steel can meet the index requirements by reheating and quenching at 850 ℃ for2 h/water cooling + tempering at 590 ℃5 h/water cooling. With the increase of tempering temperature after quenching, the tensile strength and yield strength of SA- 540 steel decrease, and the elongation and reduction of area of steel increase. Adding 0. 1% vanadium to SA-540 steel can obviously improve the strength and plasticity of steel, but the low-temperature impact property decreases significantly.

Key words: SA-540 Alloy Steel, Fastener, Heat Treatment, Tensile Properties