forged steel tube 1)C45,42CrMo, 40CrNiMo, 20CrNiMo 2)Size :O.D130-800mm ... thickness 60mm max. Length up to 4500mm forged steel tubeQuality GB 45,Q345B,16Mn,42CrMo, 40CrNiMo, 20CrNiMo EN C45, S355J2G3, 16MnCr5 ... turned Tolerance of O.D. -0/+5mm Heat treatment Normalized, Q+T, Annealed UT Sep 1921-84, Group 3, Class C ... your request Other qualities could also be supplied forged steel tube