KS D ISO 9328-4-2003(2013) 承压用钢板和钢带交货技术条件第4部分:正火或淬火回火条件下提供的高保证应力可焊细晶粒钢
Steel plates and strips for pressure purposes-Technical delivery conditions-Part 4:Weldable fine grain steels with high proof stress supplied in the normalized or quenched and tempered condition