... A106 Gr.B 4: ASME B36.10 Standard: JIS, GB, DIN, ASTM, APIStandard: JIS G3454-2007, JIS G3455-2005, GB/T ... ,SAE1045 JIS G4051, S20C ,S45C, JIS G3454, JIS 3454 ,STPG42 DIN 17175 ST 45-8, ST 52 (5) Tolerate: OD :+1 ... quality products with the most competitive prices. weldable pipe fittings DIN 2615