材料期刊网

CCT curves of Mn-Si steels with different Mn content or carbon content were tested and on this basis, water cooled baintic steels with non-expensive alloy element were developed. The results show that transformation of bainite can be separated from that of ferrite when Mn content approach certain content; relative length of incubation time of ferrite and bainite transformation can be controlled by changing carbon content in Mn-Si; granular bainite was obtained when Ф300mm bar cooled by water, mix structure of fine widmanstatten ferrite, granular bainite and martensite was obtained as plate of 40mm thickness cooled by water; water cooled baintic steels developed with non-expensive alloy shows good combination of strength and toughness and tensile strength, yield strength and toughness (AKU -20 oC ) of Ф300m bar after water cooled is higher than 850MPa, 620MPa, 65 J respectively, and tensile strength, yield strength and toughness (AKU -20 oC ) of plate of 40mm thickness after water cooled is higher than 1000 MPa, 800MPa, 50 J respectively