Seamless steel tube ASTM A179(ASME SA179) Application For tubular beat exchangers,condensers,and similar heat transfer apparatus. Details Size O.D.: 6.0-820.0mm W.T.: 1.0-80.0mm Length: Max.12000mm Grade and Chemical Composition(%) C 0.06-0.18 Mn 0.27-0.63 P d0.035 S d0.035 SA-450: Diamention Tolerence O.D. Inch (mm) + - 1.1/2" (38.1) 22% 0 KWK Steel Co.,Ltd Tel/Fax:+86-574-82050027 Email:culture007@gmail.com Address:Haishu District,Ningbo,China