After quenching, 420J1 stainless steel has high hardness and good corrosion resistance. After quenching, 420J2 stainless steel has higher hardness than 420J1 steel.

1.4404 stainless steel is an ultra-low carbon austenitic stainless steel. 1.4404 stainless steel has better intergranular corrosion resistance than 1.4401.

The surface treatment processes of stainless steel plates mainly include embossing, brushing, mirror treatment, frosting, sand blasting, etc.

400 series stainless steel, also known as martensitic or ferritic stainless steel, is an alloy containing chromium but no nickel. These

400 series stainless steel, also known as martensitic or ferritic stainless steel, is an alloy containing chromium but no nickel. These types of stainless steel are magnetic and generally offer good mechanical properties and high thermal conductivity.

1.4401 and 1.4404 are equivalent to 316L stainless steel‌. 1.4404 is the German DIN standard stainless steel, equivalent to the national standard 316L stainless steel.