Effects of Nb on oxidation weight gain of 65SiCrV6 spring steel
HOU Qing-yu1, DING Jing2, LIAO Zhen-cheng1, WANG Kai-zhong2, XI Bo3, HUANG Zhen-yi1
1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243000, Anhui, China; 2. Ma'anshan Iron and Steel Co., Ltd., Ma'anshan 243000, Anhui, China; 3. Special Steel Division, Nanjing Iron and Steel Co., Ltd., Nanjing 211500, Jiangsu, China
Abstract：The influence of Nb on the strength and decarbonization characteristics of Si-Cr-V series spring steels has received more attention,but less study has been focused on effect of Nb on the oxidation weight gain of the series spring steels. One of the Si-Cr-V series spring steels being 65SiCrV6 steel was selected as the research object,in which the mass percent of about 0.017%Nb was added(65SiCrV6 Nb). Using a combination of SEM+EDS,XRD,TEM,FactSage chemical thermodynamics software,diffusion theory,and mathematical statistics,it would be evaluated whether the addition of Nb in 65SiCrV6 steel would affect the ease of high-pressure water descaling of the steel from the perspective of researching whether the addition of Nb would have an obvious influence on oxidation weight gain and phase composition of iron oxide scales. The results show that the addition of Nb increased the relative content of pearlite and undissolved M(C,N) in 65SiCrV6 steel,reduced the relative content of ferrite,refined the as-forged microstructure of the steel. Under experimental conditions such as the oxygen concentration of 2%-7%(volume percent),the heating rate of 8-20 ℃/min,the holding temperature of 1 050-1 150 ℃,and the holding time of 60-90 min,the addition of Nb increased the oxidation weight gain of 65SiCrV6 steel obviously,and the increase range was about 2.54%-27.82%,which was statistically significant. The main and second effects that affect in-furnace oxidation weight gain of the experimental steels were holding temperature>holding time>heating rate>oxygen concentration. The effects of holding temperature and holding time on in-furnace oxidation weight gain of the experimental steels were positively correlated;the effects of oxygen concentration and heating rate on in-furnace oxidation weight gain of the experimental steels were negatively correlated. The process for 65SiCrV6 steel to reach the minimum in-furnace oxidation weight gain was oxygen concentration of 7%,heating rate of 14 ℃/min,holding temperature of 1 050 ℃,and holding time of 60 min;the process for 65SiCrV6 Nb steel to reach the minimum in-furnace oxidation weight gain was oxygen concentration of 7%,heating rate of 8 ℃/min,holding temperature of 1 050 ℃,and holding time of 60 min. The main and second effects of Nb on the increasing magnitude of in-furnace oxidation weight gain of 65SiCrV6 steel were holding time>holding temperature>heating rate>oxygen concentration. The process with the smallest increase in the in-furnace oxidation weight gain of 65SiCrV6 steel by the addition of Nb was oxygen concentration of 2%,heating rate of 8 ℃/min,holding temperature of 1 050 ℃,and holding time of 75 min. The oxidation-solid phase transformation controlled by reaction-diffusion was the main reason for the different effects of the holding temperature,the holding time,the heating rate,and the oxygen concentration on in-furnace oxidation weight gain of experimental steels. The addition of Nb did not change the three-layer structure of iron oxide scale on the surface of 65SiCrV6 steel. The iron oxide scale was Fe2O3,Fe3O4 and FeO(or FeO+Fe2SiO4) in turn from the outward to the steel matrix. The addition of Nb reduced the relative content of Fe2SiO4,in the iron oxide scale of 65SiCrV6 steel,which was beneficial to high-pressure water descaling.
侯清宇, 丁敬, 廖振成, 汪开忠, 席波, 黄贞益. 铌对65SiCrV6弹簧钢氧化增重的影响[J]. 钢铁, 2022, 57(11): 144-156.
HOU Qing-yu, DING Jing, LIAO Zhen-cheng, WANG Kai-zhong, XI Bo, HUANG Zhen-yi. Effects of Nb on oxidation weight gain of 65SiCrV6 spring steel[J]. Iron and Steel, 2022, 57(11): 144-156.
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2022, Vol. 57 
