... Coating :Polished with Lightly oiled,varnish paint ASTM A 213 T12 STEEL PIPES Packing:Metal protecting ring ... waterproof paper and sackcloth with several steel stripsASTM A 213 T12 STEEL PIPES Mill Test Certificate:EN ... P23,P5,P9,P91DIN 1775 Gr.St35.8/III、St45.8/III、15Mo3、10CrMo910 etcEN 10210, EN 10219, BS ... deformed tubes made of corrosion resistant steel.ASTM A 213 T12 STEEL PIPES USAGE:super-heaters, ...