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EN DIN 12.7-610mm seamless alloy steel tube with Low temperature Specifications Seamless Boiler Tube Standard:ASTM,JIS,EN,DIN Sortation:High-Medium-Low temperature boiler tube High quality,Good service Common standard of boiler tube: ASTM A53 Seamless tube for boiler ASTM A106 Carbon steel tube for High-Temperature Service ASTM A178 Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tube ASTM A192 Seamless Cold-Drawn Low-Carbon Steel