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 ›› 2017, Vol. 38 ›› Issue (5): 31-33.

所属专题: 汽车用微合金钢

• 工艺技术 • 上一篇    下一篇

高碳微合金非调质钢C70S6的开发和工艺实践

万长杰,申丽娟,刘梅,赵天力   

  1. 河南济源钢铁集团有限公司科技质量处,济源 459000
  • 出版日期:2017-10-01 发布日期:2022-07-13
  • 作者简介:万长杰(1964-),男,高级工程师,1987年北京科技大学(本科)毕业,特殊钢品种开发与工艺技术研究。

Development of High Carbon Microalloying Non-Quenched-Tempered Steel C70S6 and Process Practice

Wan Changjie , Shen Lijuan , Liu Mei , Zhao Tianli   

  1. Technology and Quality Department, Henan Jiyuan Iron and Steel Group Co Ltd, Jiyuan 459000
  • Published:2017-10-01 Online:2022-07-13

摘要: 开发的高碳微合金非调质钢C70S6(/%:0.68~0.73C,0.15~0.25Si,0.45~0.55Mn,≤0.030P,0.055~0.070S,0.10~0.15Cr,0.04~0.08Ni,0.03~0.04V,0.012~00.0140N)的生产流程为120t顶底复吹转炉-LF-RH-240mm×240mm方坯连铸-Φ39mm棒材轧制。生产结果表明,通过控制Mn/S≥3,采用碱度[(CaO)/(SiO2)]4.32的LF精炼渣(/%:59.87CaO,13.86SiO2,5.55MgO,16.34Al2O3,0.64S,0.072MnO),钢水过热度1530℃连铸拉速0.65m/min,弱二冷比水量0.5L/t;二冷Ⅲ段采用气雾冷却,终轧温度≤880℃等工艺措施,高碳微合金非调质钢C70S6抗拉强度≥950 MPa,屈服强度≥550 MPa,伸长率≥10%,断面收缩率≥20%,硬度HB值为240~290,其各项指标均满足胀断连杆要求。

关键词: 120t BOF-LF-RH-CC流程, 高碳微合金非调质钢, 胀断连杆, C70S6, 开发, 工艺实践

Abstract: The production flowsheet of developed high carbon microalloying non-quenched-tempered steel C70S6 (/% : 0. 68~0.73C, 0.15~0.25Si, 0.45~0.55Mn, ≤0.030P, 0.055~0.070S, 0.10~0.15Cr, 0.04~0.08Ni, 0.03~0.04V, 0.0120~0.0140N) is 120 t top and bottom combined blowing converter-LF-RH-240mmx240mm bloom casting-φ39 mm bar rolling. Production results show that with process measures including controlling Mn/S≥3, using basicity [(CaO )/( SiO2 ) ] 4.32LF refining slag (/% : 59.87CaO, 13.86SiO2, 5.55MgO, 16.34A12O3, 0.64S, 0.072MnO) , liquid superheating extent 15~30℃,casting speed 0.65 m/min, weak secondary water rate 0.5 L/t, using air mist spray cooling at M section of secondary water cooling and finishing rolling temperature at ≤880°C , the mechanical properties of high carbon microalloying non-quenched-tempered steel C70S6 are tensile strength ≥950 MPa, yield strength ≥550 MPa, elongation ≥10% , reduction of area ≥20% and HB hardness value 240~290, and each index all meets the requirement for fracture splitting connecting rod.