Wang Chunyang,Yin Qing,Yu Feng,et al.Analysis of Metallurgical Quality and Contact Fatigue Life of Vacuum-Degassed Continuously Cast G20CrNi2Mo Steel[J].Special Steel,2026,47(04):137-144.
Wang Chunyang,Yin Qing,Yu Feng,et al.Analysis of Metallurgical Quality and Contact Fatigue Life of Vacuum-Degassed Continuously Cast G20CrNi2Mo Steel[J].Special Steel,2026,47(04):137-144.DOI:.
Analysis of Metallurgical Quality and Contact Fatigue Life of Vacuum-Degassed Continuously Cast G20CrNi2Mo Steel
G20CrNi2Mo steel exhibits high surface hardness, excellent wear resistance and superior core toughness after carburizing, quenching and tempering. It is widely used for railway freight car bearings, large rolling mill components and other parts serving under heavy load, severe impact and intense abrasive wear conditions, which impose extremely stringent requirements on the metallurgical quality and contact fatigue life of the material. This study conducts the metallurgical quality evaluation and contact fatigue life analysis on
60 mm G20CrNi2Mo steel bars produced via vacuum degassing combined with continuous casting. The results show that the vacuum-degassed continuously cast G20CrNi2Mo steel exhibits reasonable composition control, with statistical uniformity exceeding 97% for key elements such as C, Cr, Ni, and Mo, ensuring consistency in microstructure and hardness. The oxygen content in the steel is 0.000 6%, and the proportion of Al-based inclusions larger than 5 μm is less than 10%. The general porosity, center porosity, and ingot-type segregation are all rated as grade 0.5, with no other macrostructure defects observed. Both the non-metallic inclusion ratings and the macrostructure meet the qualification requirements for high-quality premium steel specified in GB/T 3203—2016. After carburizing heat treatment, the steel develops a proper hardness gradient and hardened layer, demonstrating good hardenability. The excellent metallurgical quality control enables the steel to achieve ultra-high contact fatigue life and stability. The contact fatigue life test data were analyzed using the Weibull distribution, the rated fatigue life
MONNOT J H B , COGNE J Y . Relationship of melting practice, inclusion type, and size with fatigue resistance of bearing steel: [J]. ASTM Special Technical Publication: Effect of steel manufacturing processes on the quality of bearing steels , 1988 , 1 ( 1 ): 149 - 165 .
Cao Z X , Shi Z Y , Yu F , et al . A new proposed Weibull distribution of inclusion size and its correlation with rolling contact fatigue life of an extra clean bearing steel [J]. International Journal of Fatigue , 2019 , 126 : 1 - 5 .