... competitive price, high and stable quality. Product Name Seamless Steel Tubes for Boiler, Pressure Vessel & Heat ExchangerAmerican Standard ASTM ... GRA,B, C; GR1,GR6; GR.A-1,GR.CChinese Standard GB 3087,GB 5310,GB 6479 ... St 52.0,St35.8,St45.8,17Mn4,15Mo3,13CrMo44British standard BS 3059-1,BS 3059-2,Grade 320,360, ... 10216-1, EN 10216-2Grade P235TR1, P235GH, P265GH etc.Size OD1/8"-6"or 8-168.3mm WT 1-18 ...