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

万长杰; 申丽娟; 刘梅; 赵天力

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

更新时间：2026-01-21

- Development of High Carbon Microalloying Non-Quenched-Tempered Steel C70S6 and Process Practice
- Special Steel Vol. 38, Issue 5, Pages: 31-33(2017)
- 作者机构：
  
  河南济源钢铁集团有限公司科技质量处,济源,459000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：13 July 2022，
  
  Published：13 July 2017
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万长杰, 申丽娟, 刘梅, et al. Development of High Carbon Microalloying Non-Quenched-Tempered Steel C70S6 and Process Practice[J]. Special Steel, 2017, 38(5): 31-33.
DOI：

万长杰, 申丽娟, 刘梅, et al. Development of High Carbon Microalloying Non-Quenched-Tempered Steel C70S6 and Process Practice[J]. Special Steel, 2017, 38(5): 31-33. DOI：

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）/（SiO

）

]

4.32的LF精炼渣（/%:59.87CaO，13.86SiO

5.55MgO，16.34Al

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。

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 )/( SiO

)

]

4.32LF refining slag (/% : 59.87CaO

13.86SiO

5.55MgO

16.34A1

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.

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