JIS G4304 standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications. JIS G4305 standard specification Cold-rolled stainless steel plate, sheet and strip delivery conditions.JIS G4304 or JIS G4305 standard Martensite stianless steel main steel grade:SUS440A,SUS410S, SUS420J2and so on.