ASTM A335 Alloy Steel Seamless Pipe – P11 / P22 / P91 / P92 / P5 / P9

ASTM A335 P-Grade Alloy Steel Seamless Pipe

QY Pipe supplies the full range of ASTM A335 P-series chrome-molybdenum alloy steel seamless pipes for high-temperature, high-pressure piping systems in power plants, refineries, and petrochemical facilities.

Available Grades

• P11 (1.25Cr-0.5Mo) – Equivalent to 15CrMoG; boiler and superheater piping up to 550°C
• P22 (2.25Cr-1Mo) – Equivalent to 12Cr2MoG; high-pressure steam lines up to 580°C
• P5 (5Cr-0.5Mo) – Corrosion-resistant refinery piping
• P9 (9Cr-1Mo) – High-temperature oxidation resistance
• P91 (9Cr-1Mo-V) – Supercritical power plant main steam lines up to 620°C
• P92 (9Cr-2W) – Ultra-supercritical power stations, highest creep resistance

Specifications

• Standard: ASTM A335 / ASME SA335
• Type: Hot-rolled or cold-drawn seamless
• Outer Diameter: 1/2" – 24" (DN15 – DN600)
• Wall Thickness: SCH 10 – SCH XXS
• Heat Treatment: Normalized & Tempered (N+T) or Annealed
• End Finish: Plain End (PE), Beveled End (BE)

Typical Applications

• Supercritical & ultra-supercritical power plant steam lines
• High-temperature refinery process piping
• Petrochemical reactor piping
• Boiler headers and manifolds

Certifications

EN 10204 3.1 / 3.2 Mill Test Report. NACE MR0175 compliance available for P5/P9. Third-party inspection accepted (SGS, BV, TÜV).

MOQ: 1 Ton | Lead Time: 20–45 days | Origin: China

📧 Please specify grade, OD, wall thickness, and quantity when inquiring.