1. We can meet standard GB/T, DIN, ISO, ASTM. 2. Materials: Carbon, stainless steel and alloy steel. 1. ... We can meet standard GB/T, DIN, ISO, ASTM.2. Materials: Carbon, stainless steel and alloy steel.3 ... customer drawing & specification! Cylinder Sleeves used for railway&transport&railway tank,hopper,flat,wagon&train&freight transport