| 汽车曲轴用含硫易切削钢C38N2硫化物控制的工艺实践 |
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| 引用本文： | 郑文超,夏旺苟,何浪,陈国生,张念. 汽车曲轴用含硫易切削钢C38N2硫化物控制的工艺实践[J]. 特殊钢, 2019, 40(1): 43-46 |
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| 作者姓名： | 郑文超 夏旺苟 何浪 陈国生 张念 |
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| 作者单位： | 湖北新冶钢有限公司1棒材研究所;2炼钢事业部，黄石435001；3大冶特殊钢股份有限公司高品质特殊钢湖北重点实验室，黄石435001 |
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| 基金项目： | 国家重点研发计划项目资助(2016YFB0300100) |
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| 摘 要： | C38N2钢(/%:0. 36～0.40C,0. 50～0.65Si,1. 40～1. 55Mn,≤0. 025P,0. 010～0.040S,0.10～0.25Cr,≤0.01Al,0. 015～0.020N)的生产工艺流程为120 t BOF-LF-RH-410 mm×530 mm连铸坯-连轧成Φ170 mm材。统计分析了精炼渣碱度(2. 0～5. 5)、成品钢中Ca含量(0～0. 075%)、中间包覆盖剂碱度(5. 94和1.70)、二冷水(0. 14～0. 24 L/kg)和结晶器搅拌电流(250 A和100 A)对钢中硫化物的影响,通过采用2～3低碱度精炼渣,控制[Ca]/[S]>0.03,使用1.70碱度中间包覆盖剂,二冷水0.24 L/kg,结晶器搅拌电流100 A等工艺措施,使钢中A类细系硫化物≤2.5级的比率从工艺改进前80%提高至95%,钢中小尺寸、弥散分布的球形或纺锤形硫化物明显增多。
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| 关 键 词： | 含硫易切削钢C38N2 MnS 钙处理 形态控制 二冷水 结晶器电磁搅拌 |
| 收稿时间： | 2018-08-12 |
Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft |
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| Zheng Wenchao,Xia Wanggou,He Lang,Chen Guosheng,Zhang Nian. Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft[J]. Special Steel, 2019, 40(1): 43-46 |
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| Authors: | Zheng Wenchao Xia Wanggou He Lang Chen Guosheng Zhang Nian |
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| Affiliation: | 1 Steel Bar R&D Department; 2 Steelmaking Plant,Hubei Xinyegang Steel Co Ltd, Huangshi 435001;3 Hubei Key Laboratory of High Quality Special Steel,Daye Special Steel Co Ltd, Huangshi 435001 |
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| Abstract: | The production process flowsheet of steel C38N2 (/% : 0. 36 〜0.40C, 0. 50 ~0. 65Si, 1.40 ~ 1. 55Mn, ≤ 0.025P, 0.010 ~0.040S, 0. 10 ~0,25Cr, ≤ 0.01A1, 0.015 ~0.020N) is 120 t-BOF-LF-RH-410 mm x 530 mm bloom casting-continuous rolling to Φ170 mm products. The statistics of effect of refining slag basicity (2. 0 ~ 2. 5 ) , Ca content in finished steel (0 ~ 0.075%), tundish shielding agent basicity (5. 94 and 1.70), secondary cooling water (0. 14 ~0. 24 L/kg) and mould electromagnetic stirring current (250 A and 100 A) on sulfide in steel has been analyzed. With process measures including using 2 ~3 low basicity slag .in refining, controlling [ Ca]/[ S]>0. 03 , using tundish shielding agent basicity 1. 70, secondary cooling water rate 0. 24 L/kg and mould electromagnetic stirring current 100 A, the ratio of rating ≤2. 5 of A-thin series sulfide in steel increases from 80% before process improvement to 95% , and the fine, dispersed distributed spheroidal and spindle-shaped sulfide in steel increases markedly. |
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