Experiment on effect of nitrogen content in steel on sulfide of sulfur-containing gear steel
YIN Chuan-lei1,2, LIN Peng1,2, ZHANG Hong-cai1,2, ZHAI Wan-li1,2, YANG Li-mei1,2
1. Technology Center, Huaigang Special Steel Co. , Ltd. , Jiangsu Shagang Group, Huai′an 223002, Jiangsu, China;
2. Key Laboratory of Special Steel New Materials for Rail Traffic of Jiangsu Province, Huai′an 223002, Jiangsu, China
The production process of 20CrMnTi ( mass fraction/%: 0.17~0.23C, 0.17~0.37Si, 0.80~1.00Mn, 0.025~0.035S, 0.004~0.08Ti, 1.10~1.25Cr) is 90 t LD-LF-RH-CCM-150 mm×150 mm billet continuous casting in a steel plant. Through thermodynamic calculation, MnS and TiN in gear steel 20CrMnTi steel are precipitated between liquidus and solidus. Experiment study on the combined denaturation effect of sulfide and titanium nitride in steel is studied on the condition of the steel with different nitrogen content. The results show that when the nitrogen content in the steel is at about 0.005 5%, TiN is preferentially precipitated as to MnS. More of the sulfide inclusions in the steel are nucleated with titanium nitride to form composite inclusions of manganese sulfide and titanium nitride, thereby improving the size and morphology of class A inclusions. Class A inclusions become short and uniformly dispersed. According to the GB/T 10561, the grade 1.5 is achieved.
印传磊, 林鹏, 张洪才, 翟万里, 杨丽梅. 钢中氮含量对含硫齿轮钢硫化物影响的试验[J]. 中国冶金, 2020, 30(7): 61-67.
YIN Chuan-lei, LIN Peng, ZHANG Hong-cai, ZHAI Wan-li, YANG Li-mei. Experiment on effect of nitrogen content in steel on sulfide of sulfur-containing gear steel[J]. China Metallurgy, 2020, 30(7): 61-67.
2020, Vol. 30 
