Determination and Application of High Temperature Thermoplasticity and Continuous Cooling Transition（CCT） Curve of 16MnCr 5

doi:10.20057/j.1003-8620.2023-00007

Special Steel ›› 2023, Vol. 44 ›› Issue (4): 120-124.DOI: 10.20057/j.1003-8620.2023-00007

• Forming and Phase Transition • Previous Articles Next Articles

Determination and Application of High Temperature Thermoplasticity and Continuous Cooling Transition（CCT） Curve of 16MnCr 5

Wang　Ningtao^1，2， Wang　Lijun^1，2， Guo　Juncheng^1，3， Han　Guangyang^1，4

1 Hebei Engineering Innovation Center for Wire Rod， Xingtai 054027， China；
2 Technical Centre， Xingtai Iron & Steel Co.，Ltd.， Xingtai 054027， China；
3 Wire Rod Plant of Xingtai Iron & Steel Co.，Ltd.， Xingtai 054027， China；
4 Sales department of Xingtai Iron & Steel Co.， Ltd.， Xingtai 054027， China

Received:2023-02-06 Online:2023-08-01 Published:2023-07-14

16MnCr5高温热塑性及连续冷却转变曲线测定及应用

王宁涛^1，2，王利军^1，2，郭俊成^1，3，韩光洋^1，4

1 河北省线材工程技术创新中心，邢台 054027；
2 邢台钢铁有限责任公司技术中心，邢台 054027；
3 邢台钢铁有限责任公司线材厂，邢台 054027；
4 邢台钢铁有限责任公司销售公司，邢台 054027

作者简介:王宁涛（1987-），男，硕士，高级工程师

Abstract

Abstract: The dynamic high temperature ductility test shows that 16MnCr5 steel does not appear brittleness in the second brittle zone （900-1 200 ℃）， and the optimum deformation temperature is 800-1 050 ℃. The plasticity decreases between 600 and 750 ℃， corresponding to the third brittle zone.The continuous cooling transformation experiment shows that when 16MnCr5 steel is cooled at speed between 0.5-3 ℃/s， uniform ferrite and pearlite structure can be obtained； When the cooling speed is more than 5 ℃/s， bainite appears. The structure transformation of 16MnCr5 steel continuous casting billet cooled to 600 ℃ has just been completed or has not yet been completed， therefore the temperature of hot charging should be lower than 600 ℃ as far as possible. After 16MnCr5 wire rod is rolled， close the insulation cover for slow cooling， which is conducive to subsequent processing. After rolling 16 MnCr5 steel wire rods， the insulation cover is closed for slow cooling， which is used in the production of Φ30 mm large size 16 MnCr5 steel wire rod. The microstructure is F + P with grain size about 7.5， hardness about 80HRB， and uniform microstructure， which can meet the requirements of downstream customers for drawing and cold heading.

Key words: 16MnCr5 Steel, High Temperature Thermoplasticity, CCT, Hot Charging

摘要： 动态高温热塑性实验表明16MnCr5钢在第II脆性区（900～1 200 ℃）未出现脆性，最佳变形温度为800～1 050 ℃。在600～750 ℃之间塑性变差，对应于第Ⅲ脆性区。连续冷却转变实验表明16MnCr5钢在0.5～3 ℃/s之间冷却时，得到均匀的铁素体和珠光体组织；超过5 ℃/s冷却时，出现贝氏体组织。16MnCr5钢连铸坯冷却到600 ℃组织转变刚完成或尚未完成，因此，热装的温度应尽量低于600 ℃。16MnCr5钢盘条轧制后关闭保温罩缓冷，运用于生产Φ30 mm大规格16MnCr5钢线材，组织为F+P，晶粒度约7.5级，硬度达到80HRB，组织均匀，可以满足下游客户拉拔、冷镦使用要求。

关键词: 16MnCr5钢, 高温热塑性, CCT, 热装

CLC Number:

TG142.1

Wang　Ningtao, Wang　Lijun, Guo　Juncheng, Han　Guangyang. Determination and Application of High Temperature Thermoplasticity and Continuous Cooling Transition（CCT） Curve of 16MnCr 5[J]. Special Steel, 2023, 44(4): 120-124.

王宁涛, 王利军, 郭俊成, 韩光洋. 16MnCr5高温热塑性及连续冷却转变曲线测定及应用[J]. 特殊钢, 2023, 44(4): 120-124.

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Determination and Application of High Temperature Thermoplasticity and Continuous Cooling Transition（CCT） Curve of 16MnCr 5

16MnCr5高温热塑性及连续冷却转变曲线测定及应用

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