Study on Continuous Cooling and Isothermal Cooling Microstructure Transformation of High Strength Steel SCr440 for Automotive Fasteners and Application

李战卫; 于学森; 沈奎; 张宇; 刘卫

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Study on Continuous Cooling and Isothermal Cooling Microstructure Transformation of High Strength Steel SCr440 for Automotive Fasteners and Application

更新时间：2026-01-21

- Study on Continuous Cooling and Isothermal Cooling Microstructure Transformation of High Strength Steel SCr440 for Automotive Fasteners and Application
- Special Steel Vol. 43, Issue 2, Pages: 90-94(2022)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：06 August 2021，
  
  Online First：10 June 2022，
  
  Published：10 June 2022
- 稿件说明：
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李战卫, 于学森, 沈奎, et al. 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.
DOI：

李战卫, 于学森, 沈奎, et al. 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. DOI：

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℃;当转变温度降低到550℃以下

组织中出现贝氏体。依据热模拟试验结果

进行工业轧制Φ18 mm SCr440钢盘条

冷拔至Φ17 mm

再经球化退火700～760℃及冷拔成Φ15.7 mm线材

可用于制造10.9级汽车用法兰面螺栓。

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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