| 高强度汽车紧固件用钢SCr440连续冷却和等温冷却组织转变研究及应用 |
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| 引用本文： | 李战卫,于学森,沈奎,张宇,刘卫.高强度汽车紧固件用钢SCr440连续冷却和等温冷却组织转变研究及应用[J].特殊钢,2022,43(2):90-94. |
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| 作者姓名： | 李战卫 于学森 沈奎 张宇 刘卫 |
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| 作者单位： | 1江苏省(沙钢)钢铁研究院,张家港215625 ；
2江苏沙钢集团有限公司棒线厂,张家港215625 |
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| 摘 要： | 通过热模拟试验研究了高强度汽车紧固件用钢SCr440(0.40％C,1.00％Cr)的组织转变行为.从850℃连续冷却时,当冷速≤1℃/s时,转变后的组织为铁素体和珠光体;当冷速达到2℃/s时,组织中开始出现贝氏体和马氏体;当冷速≥7℃/s时,组织主要以马氏体和贝氏体为主.等温转变时,珠光体转变的温度为550～700℃...
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| 关 键 词： | 汽车紧固件用钢 SCr440 连续冷却 等温转变 |
| 收稿时间： | 2021-08-06 |
Study on Continuous Cooling and Isothermal Cooling Microstructure Transformation of High Strength Steel SCr440 for Automotive Fasteners and Application |
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| Li Zhanwei,Yu Xuesen,Shen Kui,Zhang Yu,Liu Wei.Study on Continuous Cooling and Isothermal Cooling Microstructure Transformation of High Strength Steel SCr440 for Automotive Fasteners and Application[J].Special Steel,2022,43(2):90-94. |
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| Authors: | Li Zhanwei Yu Xuesen Shen Kui Zhang Yu Liu Wei |
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| Affiliation: | 1 The Institute of Research of Iron & Steel, Jiangsu Province Sha-steel, Zhangjiagang, 215625 ；
2 Bar and Wire Rod Plant of Jiangsu Shagang Group Co Ltd, Zhangjiagang, 215625 ) |
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| Abstract: | The phase transformation characteristics of high strength steel SCr440 ( 0.40% C, 1.00% Cr) for automotive fasteners are studied by thermal simulation. From 850 °C by cooling rate ≤ 1℃ /s continuous cooling, the transformed structure is ferrite and pearlite, and bainite and martensite occur in structure with cooling rate reached 2 ℃/s, by cooling rate ≥7 °C/s the main structure in steel is martensite and bainite. The pearlitic transformation temperature is 550 ~700 °C during isothermal conditions, and bainitic transformation occurs when the transformation temperature decreased below 550 °C. Based on thermal simulation results, the Φ 18 mm SCr440 steel rod has been successfully rolled, and can be used to manufacture 10.9 grade automobile flange bolts by cold drawing to Φ 17 mm rod, then spheroidizing annealing at 700 ~ 760 °C and cold drawing to Φ15.7 mm rod. |
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