DEVELOPING OF NON-QUENCHED AND TEMPERED BAINITIC STEEL

In order to decrease the product cost, a newly high strength bainitic steel have been developed. This steel is a plain carbon structural steel, its advantage is using cheap V, Mn, Cr instead of expensive Ni, Mo, B and other elements for alloying. The heat treatment of steel is not needed, so the production process is simply. The heating and rolling schedule are similar with other steels, but adopting controlled rolling and air cooling increase the strength and toughness. The tensile strength of experimental steel plates is higher than 860 MPa, and the impact toughness is improved with the decreasing of end rolling temperature.