Effect of Nitrogen on the Vanadium Precipitation Behavior of Higher Yield Strength Weathering Steels

The separate addition or combined addition of microalloy elements based on common weathering steel is usually applied in producing higher yield strength weathering steels.The target-oriented researches on the vanadium-containing weathering steels were conducted in this paper that combined with the advantage of vanadium resource at Panzhihua Iron & Steel(Group) Co..Methods such as Glbeele-3500 thermal simulated test machine,phase analyzing,and so on were used to investigate the vanadium precipitation amount-temperature-time(PTT) of test samples with different deformation degree and nitrogen content.The relationship between the amount of vanadium precipitates,temperature and precipitate time was analyzed.It has been found that the PTT curves of test samples with the same austenite amount are C curve shape,a shortest time of precipitation along with the vanadium precipitation process is also been found.Increase the nitrogen content will make PTT curve move to the left obviously.Additionally,increasing deformation degree can accelerate the rate of V(C,N) particle precipitation in the austenite,make PTT curve move to the left obviously.It has been also found that the more deformation degree,the shorter start time of the V(C,N) particle precipitation.The study offers the essential technical support for the further development of products.