In the recent years,the apparent consumption of stainless steels has been increasing year byyear in China. In 2}Oi,China increased by 3D% and reached 2.37 million
Stainless steels have been variously used nawadays,owing to their many superiorproperties such as formability,strength and corrosion resistance. It has been as sh
17%-1l9% Cr ferritic stainless steels,as durable material,have been used widely. In view ofcorrosion resistance. pitting e}rrasian,rusting and stress corrosion etc.