Improvement of -20℃ Transverse Impact of 26CrMoV Steel Quenched and Tempered φ195 mm Bars by Normalizing Pretreatment

Special Steel ›› 2021, Vol. 42 ›› Issue (5): 75-77.

Improvement of -20℃ Transverse Impact of 26CrMoV Steel Quenched and Tempered φ195 mm Bars by Normalizing Pretreatment

Zeng Yun¹'², Zhang Yue¹'², Li Bopeng^{1 2}, Peng Feng^1,2 , Hu Ruihai^1,2,Zheng Jinfeng^1,2 ,Duan Song^1,2 and Liao Kai³

1. Technology Center, Daye Special Steel Co.,Ltd., Huangshi 435001；
2. Hubei Key Laboratory of High Quality Special Steel, Huangshi 435001；
3. Huangshi Product Quality Supervision and Inspection Instition, Huangshi 435000

Received:2021-02-08 Online:2021-10-01 Published:2023-02-03

正火预处理对调质26CrMoV钢φ195mm棒材横向-20℃冲击功的改善

曾云^1,2, 张越^1,2 , 李博鹏^1,2 , 彭峰^1，2 , 胡瑞海^1,2 , 郑锦锋^1,2 , 段松^1,2 , 廖凯³

1. 大冶特殊钢有限公司技术中心，黄石 435001 ；
2. 髙品质特殊钢湖北省重点实验室，黄石 435001 ；
3. 黄石市产品质量监督检验所，黄石 435000 ;

作者简介:曾云(1988-)，男，工程师，2012年重庆科技学院(本科)毕业，材料热处理研究。

Abstract

Abstract: The Ti-V microalloying 26CrMoV steel (/%：0.27C,0.45Mn,0.25Si,0.006P,0.004S,0.97Cr,0.78Mo, 0.002Ti,0.043V) ϕ195 mm hot-rolled bar is treated at laboratory by two processes：880°C quenching +645°C tempering and 925 °C normalizing + 880 °C quenching + 645 °C tempering. It is found that at the subsurface 25.4 mm of bar the yield and tensile strength of the bar by the two heat treatment processes are similar,the -20°C transverse impact energy of the bar treated by quenching + tempering is 46 ~47 J,but that treated by normalizing + quenching + tempering is 79 ~86J, the improvement effect is obvious. It is found that the microstructure of tempered sorbite and ferrite in steel with normalizing pretreatment is more uniform and smaller than that with out normalizing pretreatment.

摘要： 对直径为 φ195 mm 的Ti-V微合金化26CrMoV 钢(/% ：0.27C,0.45Mn,0.25Si,0.006P,;0.004S, 0.97Cr,0.78Mo,0.002Ti,0.043V)热轧棒材取样后在热处理试验室分别按880 ℃淬火+645℃回火和925℃正火+880℃淬火+645℃回火两种工艺进行热处理。通过检测其皮下25.4 mm处力学性能，发现两种热处理工艺试样的屈服及抗拉强度相近，淬火+回火处理的-20 ℃横向冲击为46 ~47 J 而正火+淬火+回火处理的-20 ℃横向冲击功为79~86 J,改善效果明显。对比观察发现经正火预处理后钢的回火索氏体及铁素体组织更加均匀、细小。

关键词: 正火预处理, 调质棒材, 横向低温冲击

Zeng Yun, Zhang Yue, Li Bopeng, Peng Feng , Hu Ruihai, Zheng Jinfeng , Duan Song and Liao Kai. Improvement of -20℃ Transverse Impact of 26CrMoV Steel Quenched and Tempered φ195 mm Bars by Normalizing Pretreatment[J]. Special Steel, 2021, 42(5): 75-77.

曾云, 张越, 李博鹏, 彭峰, 胡瑞海, 郑锦锋, 段松, 廖凯. 正火预处理对调质26CrMoV钢φ195mm棒材横向-20℃冲击功的改善[J]. 特殊钢, 2021, 42(5): 75-77.