Heat treatment process of 30CrMo hot rolled steel produced by CSP process

HUANG Hui- hui,YANG Geng- wei,ZHAO Gang,DA Chuan- li,HE Xian- ling,CAI Zhen,

Journal of Iron and Steel Research ›› 2018, Vol. 30 ›› Issue (3) : 236-243.

Journal of Iron and Steel Research ›› 2018, Vol. 30 ›› Issue (3) : 236-243. DOI: 10. 13228/j.boyuan.issn1001- 0963. 20170057

Heat treatment process of 30CrMo hot rolled steel produced by CSP process

  • HUANG Hui- hui1,YANG Geng- wei1,ZHAO Gang1,DA Chuan- li1,HE Xian- ling1,CAI Zhen1,2
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Abstract

The effect of heat treatment processes on microstructure and mechanical properties of 30CrMo hot rolled steel produced by CSP (compact strip production) process were investigated. The results show that the martensite is obtained in the experimental steels by oil quenched from 900℃ after holding for 15min and 60min. And the samples which oil quenched from 900℃ after holding for 15min have the better mechanical properties after tempering at different temperatures. With the increase of tempering temperature, the decomposition of martensite accelerated that resulted in the lath character of martensite gradually disappeared and the precipitation of cementite in matrix. When the tempering temperature increased from 200℃ to 600℃, the tensile strength decreased from 1744MPa to 949MPa and the hardness of the experimental steel decreased from 50. 8HRC to 35. 3HRC.While the elongation first decreased and then increased, the yield strength first increased and then decreased. When the tempering temperature is 300℃, the experimental steel has the maximum yield strength and theminimum elongation which are 1421MPa and 7. 5%, respectively. Moreover, the model was developed to predict the hardness of experimental steel after tempered at different temperatures for 120min. The calculated results were in good agreement with the experimental results.

Key words

CSP process / 30CrMo steel / heat treatment process / martensite / mathematical model

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HUANG Hui- hui,YANG Geng- wei,ZHAO Gang,DA Chuan- li,HE Xian- ling,CAI Zhen,. Heat treatment process of 30CrMo hot rolled steel produced by CSP process[J]. Journal of Iron and Steel Research, 2018, 30(3): 236-243 https://doi.org/10. 13228/j.boyuan.issn1001- 0963. 20170057

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