A Study on Heat Simulation of Surface Longitudinal Crack of
Gear Steel 20CrMnTiH Concasting Billet

Special Steel ›› 2007, Vol. 28 ›› Issue (6): 1-3.

A Study on Heat Simulation of Surface Longitudinal Crack of Gear Steel 20CrMnTiH Concasting Billet

Liu Shihong^1,2, Wu Shoufang^1，3, Li Hong¹, Wang Gongliang², Liang Mei² ， Wang Xinhua¹

1 Metallurgical and Ecological Engineering School, University of Science and Technology, Beijing 100083 ；
2 Shijiazhuang Iron & Steel Co Ltd, Shijiazhuang 050031 ；
3 Tianjin Pipe Group Co Ltd, Tianjin 30030

Received:2007-06-05 Online:2007-12-01 Published:2022-12-26

20CrMnTiH齿轮钢连铸坯表层纵裂的热模拟研究

刘石虹^1,2，武守防^1,3,李宏¹，王恭亮²，梁玫²，王新华¹

1北京科技大学冶金与生态工程学院，北京100083 ；
2石家庄钢铁有限责任公司，石家庄050031:
3天津钢管集团有限公司，天津300301

通讯作者: 李宏
作者简介:刘石虹(1959-)，男，石家庄钢铁有限公司总工程师,《特殊钢》编委,1982年河北矿冶学院毕业，从事特殊钢冶炼、非调质钢工艺研究。

Abstract

Abstract: The strength and plasticity of (mm) 150 x 150, 180 x 220 and 220 x 300 concasting billet of gear steel 20CrMnTiH at 600 ~ 1 300 °C have been studied by Gleeble-1500 thermal simulation machine. Test results showed that the actual strength at fracture S_k of three size of billet at 650 ~ 950 °C was very low, at 950 ~ 1 200 ℃ the S_k increased with increasing temperature, then the S_k decreased at temperature higher than 1 200 °C ； the second brittle zone of steel was at 950 ~ 700 ℃. It is available to prevent crack source evolving into longitudinal crack by increasing the shell thickness of billet out of mold and decreasing holding time at 950 ~ 700 °C zone.

Key words: Gear Steel 20CrMnTiH, Concasting Billet, Longitudinal Crack, Mechanical Properties, Thermal Simulation

摘要： 通过Gleeble-1500热模拟机研究了20CrMnTiH齿轮钢(mm):150×150、180×220、220×300连铸坯600～1300℃的强度和塑性。试验结果表明,3种铸坯在650～950℃真实断裂强度S_k很低,在950～1200℃随温度升高S_k增加,超过1200℃时S_k降低;该钢的第2脆性区为950～700℃,增加连铸坯出结晶器坯壳厚度,降低950～700℃区间停留时间,有利于防止裂纹源扩展成纵裂纹。

关键词: 20CrMnTiH齿轮钢, 铸坯, 纵裂纹, 力学性能, 热模拟

Liu Shihong, Wu Shoufang , Li Hong, Wang Gongliang, Liang Mei , Wang Xinhua. A Study on Heat Simulation of Surface Longitudinal Crack of Gear Steel 20CrMnTiH Concasting Billet[J]. Special Steel, 2007, 28(6): 1-3.

刘石虹, 武守防, 李宏, 王恭亮, 梁玫, 王新华. 20CrMnTiH齿轮钢连铸坯表层纵裂的热模拟研究[J]. 特殊钢, 2007, 28(6): 1-3.