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ASTM A335 P9 Pipe

ASTM A335 P9 Alloy Steel Seamless Pipes – High-Quality Solutions by Kwality Steelage Pvt. Ltd., Mumbai, India

ASTM A335 P9 Alloy Steel Seamless Pipes, widely known as “9 Chrome” with the UNS designation S50400, are manufactured by Kwality Steelage Pvt. Ltd. to meet the exacting demands of high-temperature applications. Renowned for their performance in oil, gas, and power generation industries, these pipes are formulated with high chromium (8.00-10.00%) and molybdenum (0.90-1.10%) content, which grants them exceptional strength and corrosion resistance. They are ideally suited for applications such as hydrocrackers, reheat lines, and refinery heater tubes, ensuring durability in extreme environments.

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The chemical composition of ASTM A335 P9 pipes includes carbon (up to 0.15%), manganese (0.30-0.60%), silicon (0.25-1.00%), phosphorus (0.025% max), and sulfur (0.025% max), enhancing their durability and performance under high stress. Their robust mechanical properties include a minimum tensile strength of 415 MPa and yield strength of 205 MPa, with a hardness limit set at 250 HB. This specification guarantees that the alloy can handle rigorous industrial conditions without compromising on performance.

Available in a broad range of sizes, Kwality Steelage’s P9 pipes span from ½” to 24” NPS, with various wall thickness options, including SCH 40, SCH STD, SCH 80, SCH XS, and SCH 160. These pipes come in seamless hot-rolled forms and are offered in 6-meter and 12-meter standard lengths, with custom lengths available upon request. Surface treatments such as phosphating, passivation, shot blasting, oil dipping, and varnishing are also available. Coatings like 3LPE and FBE add additional protection, while end finishes include plain ends (PE), beveled ends (BE), and threaded ends, making them highly adaptable to different welding and installation needs.

Kwality Steelage adheres to industry standards including ASTM A999/A999M and ASME SA335, ensuring that their P9 pipes are made to the highest quality benchmarks. They also offer corresponding ASTM A234 WP9 pipe fittings, ASTM A182 F9 flanges, and ASTM A387 Grade 9 plates, making it easy to source all related materials for your project from a single trusted supplier. This comprehensive inventory supports applications that require seamless integration in high-temperature and high-stress environments, especially in refinery and power generation industries where safety and longevity are paramount.

With an extensive selection and commitment to quality, Kwality Steelage Pvt. Ltd. stands out as a reliable supplier of ASTM A335 P9 pipes. Their products are well-suited for industries ranging from petrochemicals and gas processing to machine building and fertilizer production, providing versatility and high performance for critical applications.

Specification Chart for ASTM A335 P9 Alloy Steel Pipes for High-Temperature Services

Specification	Details
Size Range	1/8 to 30 inch NB
Schedule Thickness Range	SCH 40, SCH 80, SCH 160, XS, XXS, All Schedules
Applications	Oil Refineries, Petrochemical Industries, Power Plants, Boilers, Chemical Industries, Marine and Shipbuilding, Fluid and Gas Transmission
Pipe Type	Seamless
Pipe & Tube Form	Round, Square, Rectangular, Hydraulic Pipes
Manufacturing Process	Hot-Finished, Cold Drawn, Heat Treated (Annealed, Normalized, Quenched, and Tempered)
Material Composition	Alloy Steel with Chromium (8.0-10.0%), Molybdenum (0.90-1.10%)
End Type	Plain, Beveled, Threaded
Length Options	Single, Double Random, Custom Lengths (up to 12 meters)
End Protection	Plastic Caps
Outside Coating	Anti-Corrosion Oil, Black Painting

Dimensional Tolerances for ASTM A335 P9 Pipes

Tolerance Type	Outside Diameter (OD)	Wall Thickness (WT)
Size Tolerance	+1% / -1% of specified OD	+12.5% / -10% of specified WT

Size and Weight Chart for ASTM A335 P9 Seamless Alloy Steel Pipes

Outside Diameter (mm)	Wall Thickness (mm)	Nominal Size (in.)	Schedule	Weight (Kg/m)
13.72	1.65	1/4	SCH 40	0.52
21.34	3.73	1/2	SCH 80	1.70
60.33	7.11	2	SCH 160	9.58
88.90	11.13	3	SCH 160	21.80
168.28	18.26	6	SCH 160	69.00

Note: Additional sizes and weights are available upon request.

Mechanical Properties of ASTM A335 P9 Pipes

Grade	Yield Strength (Min)	Tensile Strength (Min)	Elongation (%)
P9	205 MPa	415 MPa	20-30

Chemical Composition of ASTM A335 P9 Pipes

Element	% Composition
Carbon (C)	0.15% max
Manganese (Mn)	0.30 – 0.60%
Phosphorus (P)	0.025% max
Sulfur (S)	0.025% max
Silicon (Si)	0.25 – 1.00%
Chromium (Cr)	8.0 – 10.0%
Molybdenum (Mo)	0.90 – 1.10%

Price Range (per Metric Ton)

Pipe Type	Price Range (USD)
ASTM A335 P9 Seamless Pipes	$700 – $1,800

Welding and Heat Treatment for ASTM A335 P9 Pipes

For welding ASTM A335 P9 pipes, precise handling is crucial to avoid excess hardness and residual stress. Post-Weld Heat Treatment (PWHT) is advised for pipes with thicknesses over 13 mm, while preheating to around 120°C may be sufficient for thinner sections. This process reduces the risk of stress cracking and ensures reliable, durable joints suitable for high-temperature environments.

Differences Between ASTM A335 P9 and P11 Pipes

Feature	P5	P9
Carbon Content	0.05-0.15%	0.05-0.15%
Yield Strength (Min)	205 MPa	310 MPa
Applications	High-Temperature, Low Pressure	High-Temperature, High Pressure