1.min OD30mm, max 2020mm 2.Min thickness 6mm, max 80mm 3. CE/API/ISO CERT 4.Annealing,straigten, bevel 5.prescise inspection Good corrosion resistance, heat resistance, oxygen resistanceChemical Composition CSiMnPSNiCrMo≤0.08≤1.002.000.0350.0310.0-14.016.0-18.52.0-3.0Mechanical Properties:Yield Strength: ≥205Tensile Strength: ≥450Elongation: ≥22% thick-wall larger-diameter welded tubes