At present, posco has been intensify development of 400 series stainless steel products, developed the series of products for a variety of specifications of auto parts. Think posco, 400 series stainless steel products in the domestic market demand, mainly concentrated in the auto and home appliance industry in order to meet the recent automobile exhaust system on the properties of corrosion resistance and high temperature strength requirements, the more it is necessary to speed up the development of 400 series stainless steel products. Also, on the other hand, modern BNG steel company in the vehicle with the development of stainless steel products. The company is mainly decorated with 400 series stainless steel products, once this kind of high quality and low cost products mass production, is expected to be applied to the compact car. Auto outer decoration steel 430 cun compared with the existing 430 j1l, high gloss surface, no defects, the current domestic output of 200 tons per month in Korea. As demand continues to grow at home and abroad, this kind of high value-added products will generate considerable economic benefits.