Development of high strength ferrite-martensite stainless steels （FMSSs） for railway cargo transportation
摘要
Two ferrite-martensite stainless steels(FMSSs)were developed by Baosteel based on the T4003 composition,through optimizing the manganese and nickel contents,reducing silicon,carbon and nitrogen contents,controlling remnant niobium and molybdenum,adding sufficient titanium and controlling the processing.In this study,the physical metallurgy of such FMSSs was investigated with the emphasis on the alloying effect on the phase balance during processing and the transformation behavior during welding for different microstructures.In addition,the mechanical behavior and the weldability were investigated.The results indicate that such steels have a good combination of strength and toughness and better weldability compared with the traditional 1.4003 steel.Such high strength steels are highly suitable for railway cargo transportation where the wall thickness of the wagons can be reduced,resulting in weight savings.