ASTM A335 P9 Chrome Moly Pipe

Seamless Ferritic Alloy-Steel P9 Pipe description

‌P9‌ is a ferritic chromium-molybdenum alloy steel containing specific alloying elements that impart excellent high-temperature performance and stability, commonly used in high-temperature and high-pressure environments.

The primary alloying elements of ‌A335 P9 alloy steel pipes‌ include chromium (typically 8% to 10%) and molybdenum (approximately 0.9% to 1.1%). It also contains small amounts of carbon, silicon, manganese, phosphorus, and sulfur. This combination provides the material with good high-temperature resistance and corrosion resistance. In high-temperature environments, A335 P9 alloy steel pipes maintain high strength, resisting deformation or failure. The microstructure is primarily ferritic, ensuring stability even under prolonged high-temperature service.

 

ASTM A335 P9 Pipe Specification

End	Plain End, Beveled End, Treaded
Standard	ASTM A335 P9, SA335 P9 (with IBR Test Certificate)
Tolerance	Cold drawn pipe: +/-0.1mm Cold rolled pipe: +/-0.05mm
Thickness	3-12mm
Size	1/2" NB to 36" NB
Application	Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
Craft	Cold rolled and Cold drawn
Type	Seamless / ERW / Welded / Fabricated
available in Form of	Round, Square, Rectangular, Hydraulic Etc.
Length	Standard Double & In Cut length also.
Specialized in	Large Diameter ASTM A335 P9 Pipe
Additional Testing	NACE MR 0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc.
Schedules	SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules

 

ASTM A335 Gr P9 Composition

C, %	Mn, %	P, %	S, %	Si, %	Cr, %	Mo, %
0.015 max	0.30-0.60	0.025 max	0.025 max	0.50 max	4.00-6.00	0.45-0.65

 

ASTM A335 P9 Properties

Tensile Strength, MPa	Yield Strength, MPa	Elongation, %
415 min	205 min	30 min

 

A335 P9 Alloy Seamless Pipe Production Process‌

‌Hot-Rolled (Extruded) Seamless Pipe‌

‌Billet Heating‌: Round billet is heated to forging temperature (~1200°C).

‌Piercing‌: A mandrel is used to create a hollow shell.

‌Rolling/Extrusion‌: The shell undergoes three-roll cross-rolling, continuous rolling, or extrusion to form a seamless pipe.

‌Sizing/Reducing‌: The pipe is calibrated to final dimensions.

‌Cooling & Straightening‌: Air or water cooling followed by straightening.

‌Testing‌: Hydrostatic pressure or non-destructive testing (NDT) for defects.

‌Marking & Storage‌: Final inspection, marking, and storage.

‌

Cold-Drawn (Cold-Rolled) Seamless Pipe‌

‌Billet Heating & Piercing‌: Similar to hot-rolled process.

‌Heading & Annealing‌: The billet is headed and annealed for ductility.

‌Pickling & Coating‌: Acid cleaning and copper plating for lubrication.

‌Cold Drawing/Rolling‌: Multiple passes to achieve precise dimensions.

‌Heat Treatment‌: Normalizing or tempering to refine microstructure.

‌Straightening & Testing‌: Final straightening and NDT.

‌Marking & Storage‌: Compliance marking and storage.

 

Packaging and shipping