... , S355J2HJIS G3444:2004:STK400 ,STK500ASTM A53: GR. A , GR. B, GR. C , GR. DSize: Outer DiameterWall ThicknessLengthInchmmmmmeter1/2"21.3mm0.6mm-3 ... Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test. Third party inspection:SGS, BV, Lloyds et Hot Dipped ...