Research Development of Ultra-high Strength Low Alloy Steels

Ultra-high strength low alloy(UHSLA) steels have been widely recognised for their ultra-high strength,good hot formability and low cost of manufacture,but their poor fracture toughness is a key factor to limit their commercial use.The development of UHSLA steels is briefly reviewed.The effects of chemical composition,metallurgical methods and heat treatment process on the strength and toughness of UHSLA steels are summarized.Methods of improving the toughness,which will be important topics for future research,are pointed out.