Abstract: TRIP steel is less popular in automobile industry as compared with DP steel although the latter has much lower strength and ductility. Reasons for this are listed. By careful calculation based on thermodynamics and kinetics, a new type of TRIP steel with good weldability and galvanizing property is successfully developed both in the university laboratory and on a modern production line of steel plant. In order to make the steel suitable for domestic metallurgy processing, phosphorus is used to substitute silicon instead of aluminum.

Key words: galvanizing property, kinetics, thermodynamics, weldability, TRIP steel