The use of stainless steel

expanding the application of ferritic stainless steel
In recent years, Japan's stainless steel output and consumption of about 3 million t/a ~ 3.5 million t/a, about half of whom were of austenitic stainless steel SUS304. But SUS304 the low corrosion resistance to local corrosion, so in a harsh environment, use the steel SUS316 (increase of Ni content and add Mo). But due to the high price of Ni, so develop the prices are lower and the corrosion resistance and processability and austenitic stainless steel the same ferritic stainless steel, make no Ni or less Ni ferritic stainless steel is widely used. Such as Japan to ferritic stainless steel roof material, for large buildings built lots of stainless steel half globular arched roof pitch.
17 cr - Ti steel and 21 cr 0.2-0.4 - Cu - 0.3 C and N content of Ti steel is greatly reduced the ferritic stainless steel, its mechanical performance than traditional SUS430 ?