CSN 42 0285-1969 Instructions for treatment of alloy steel grades 13, 15 and casting of alloy steel grades 27 and 28 for constructions of steam boilers and other pressure vessels and steam piping
1969CSN 42 0285-1969 Instructions for treatment of alloy steel grades 13, 15 and casting of alloy steel grades 27 and 28 for constructions of steam boilers and other pressure vessels and steam piping