... and stable quality. Product Name Seamless Steel Tubes for Boiler, Pressure Vessel & Heat ExchangerAmerican Standard ASTM A53,ASTM A106,ASTM A333,ASTM ... St 37.0,St 44.0,St 52.0,St35.8,St45.8,17Mn4,15Mo3,13CrMo44British standard BS 3059-1,BS 3059 ... -1, EN 10216-2Grade P235TR1, P235GH, P265GH etc.Size OD1/8"-6"or 8-168.3mm WT 1-18 mmLength 0-12m