ASTM A335 - Seamless steel pipe

• Detailed introduction:

  Use: Pipeline systems in high temperature and high pressure environments.

• Steel type: Ferritic alloy steel.

• Standard content: This standard is mainly applicable to seamless pipes in high temperature and high pressure working environments, especially in power plants, fertilizer plants and other industries. It is suitable for use in places with high temperatures and high pressures.

• Main uses:

• Power plants, high temperature industrial equipment.

• High temperature pipelines in fertilizer plants, petrochemical plants, etc.

• Heat exchangers, high pressure steam pipelines.

• ASTM A335 includes P11, P22, and P91 grades, which are mainly used for high temperature and high pressure. The sizes range from 1/8 inch to 24 inches in outer diameter, and the wall thickness can be selected from Schedule 40 to XXS. The chemical composition of P11 is C 0.05–0.15%, Mn 0.30–0.60%, Si 0.50–1.00%, P, S≤0.025%, Cr 1.00–1.50%, Mo 0.44–0.65%; P22 increases Cr to 1.90–2.60%; P91 is a high chromium and high vanadium grade: C 0.08–0.12%, Cr 8.00–9.50%, Mo 0.85–1.05%, V 0.18–0.25%, Nb 0.06–0.12%. Physical properties include density of about 7.80g/cm³, Young's modulus of about 205GPa, thermal expansion coefficient of 11–12×10⁻⁶/°C, thermal conductivity of 46–48W/(m·K). Heat treatment requires normalizing + tempering, mechanical properties after normalizing tensile strength ≥415MPa, yield strength ≥205MPa, elongation ≥22%, and excellent high temperature creep resistance.

• End Finish/Coating

  • Black Plain End

  • Galvanized Plain End

  • Threaded and Coupled (Black & Galvanized)

  • Victaulic Grooved

  • Coated and Wrapped

  • Blasted and Primed (O.D. & I.D.)

  • Cement Lined

  • Concrete Coated

  • Fusion Bond Epoxy

  • Pickled and Oiled

  • Zap-Lok

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• Welding Services

• Professional welding ensures structural strength and sealing

• Sandblasting Services

• An efficient surface treatment process that uses high-speed sand flow to remove rust and impurities on the steel pipe surface and improve paint adhesion.

• A key process to evenly cover the surface of steel pipes with anti-corrosion coatings to improve their weather resistance, aesthetics and service life

• Painting services