Astm A335 Chrome Moly Pipe

Standard & Product Type

• Standard: ASTM A335 / ASTM A335M
• ASME Equivalent: SA335
• Product: Seamless ferritic alloy steel pipe (Chrome-Moly / CrMo)
• Service: High-temperature and high-pressure applications

Common P-Grades

• Main grades: P5, P9, P11, P22, P91
• Additional grades: P1, P2, P12, P15, P92, P122

Size Range

• Nominal Pipe Size (NPS): 1/4" to 24"
• Wall thickness: Schedules 40 to 160
• Available forms: STD, XS, XXS
• Unscheduled heavy wall thicknesses available up to 4 inches

Material Characteristics

• Alloyed with Chromium (Cr) and Molybdenum (Mo)
• Chromium improves oxidation and corrosion resistance
• Molybdenum enhances strength and high-temperature performance

Typical Industry Applications

• Power plants (boilers, superheaters, steam lines)
• Petrochemical plants
• Oil refineries
• Oil & gas and oil-field services

Application Guidance by Grade

• Power industry: P1, P2, P11, P12, P15, P22, P91, P92, P122
• Petrochemical and refinery services: P5, P9

Performance Characteristics

• Strong resistance to rupture at high temperatures and pressures
• Excellent creep-rupture performance
• Resistant to hydrogen attack and embrittlement
• Resistant to hot sulfide corrosion cracking
• Suitable for hydrogen sulfide and sour service environments
• Low elasticity at elevated temperatures

Forming & Welding

• Suitable for bending, flanging (vanstoning), and similar forming operations
• Suitable for fusion welding

Certification & Compliance

• DIN 50049 3.1
• EN 10204 3.1 / 3.2
• NACE MR-0175
• NACE MR-0103

Related Piping Component Specifications

• Flanges & forged fittings: A/SA 182 F1, F2, F5, F9, F11, F12, F15, F22, F91, F92, F122
• Butt-weld fittings: A/SA 234 P1, P2, P5, P9, P11, P12, P15, P22, P91, P92, P122