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ASTM A335 P9 Pipes & Tubes

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ASTM A335 P9 Pipe & Tubes Supplier

ASTM A335 P9 Pipes & Tubes

Sachin Steel is a leading manufacturer, supplier, stockist, and exporter of high-quality ASTM A335 P9 pipe. Designed with chromium-molybdenum alloy, these pipes are well-suited for high-temperature and high-pressure applications across industries such as refineries, petrochemical plants, and power generation units. With excellent strength, durability, and resistance to wear, our P9 alloy steel pipes are engineered to deliver reliable performance in demanding environments.

As a trusted name in the steel industry, we offer ASTM A335 P9 pipe that comply with international quality standards, ensuring consistent performance and long service life. Our wide product range includes different sizes, wall thicknesses, and specifications, meeting the diverse requirements of projects both in India and abroad. We maintain a large inventory of P9 chrome moly alloy steel pipes, enabling us to provide quick delivery and bulk supplies to clients worldwide. Every pipe is thoroughly inspected and tested to guarantee superior quality and durability, making us one of the most reliable sources for ASTM A335 P9 pipes.

With our strong commitment to quality, timely delivery, and customer satisfaction, Sachin Steel continues to be a trusted partner for industries looking for dependable alloy steel piping solutions.

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About ASTM A335 P9 Pipes & Tubes

ASTM A335 P9 Pipes, also known as Chrome Moly P9 pipes (UNS S50400), are seamless ferritic alloy steel pipes designed for high-temperature and high-pressure applications. With a chemical composition containing chromium and molybdenum, these pipes offer excellent strength, oxidation resistance, and durability in demanding environments.The P9 alloy steel pipes are widely used in industries for conveying oil, water, steam, natural gas, and process fluids. 

They are also suitable for boilers, heat exchangers, and pressure vessels where carbon steel pipes may not perform efficiently. Available in different sizes and dimensions, ASTM A335 P9 seamless pipes ensure uniform strength, reliable performance, and adaptability to specific project requirements, making them a preferred choice for critical applications.

Key Features of ASTM A335 Grade P9 Pipes

  • Superior High-Temperature Strength: The chrome-moly composition ensures excellent mechanical strength and stability at elevated temperatures.
  • Oxidation Resistance: High chromium content provides strong protection against scaling and oxidation in harsh thermal conditions.
  • Enhanced Corrosion Resistance: Offers greater resistance compared to carbon steel and lower chrome alloys, especially against sulfidation and aggressive environments.
  • Wide Application Range: Ideal for boilers, heat exchangers, pressure vessels, and other high-temperature industrial uses.
  • Excellent Workability: ASTM A335 P9 pipes can be bent, flanged, welded, and shaped easily while maintaining structural integrity.

Long-Term Dependability: The seamless design combined with a robust alloy composition ensures consistent performance and durability under demanding conditions.

ASTM A335 P9 Pipe Chrome Moly Pipes

ASTM A335 / ASME SA335 P9 pipes are widely recognised as chrome moly pipes because of their significant chromium and molybdenum content. These alloying elements enhance the mechanical properties and make the pipes suitable for high-temperature and high-pressure applications.

Chromium plays a vital role in improving oxidation resistance, tensile strength, and hardness at room temperature, while also providing excellent stability at elevated temperatures. When chromium content exceeds 12%, the alloy can even be categorised as stainless steel.

Molybdenum, on the other hand, enhances toughness, elasticity, and resistance to softening. It minimises grain growth, reduces embrittlement, and significantly boosts high-temperature performance in the range of 540–750°C. Additionally, molybdenum improves corrosion resistance, making P9 pipes durable and reliable for critical applications.

Types of ASTM A335 P9 pipe

seamless-pipes

ASTM A335 P9 Seamless Pipe

seamless-tubes

ASTM A335 P9 Welded Pipe

erw

ASTM A335 P9 ERW Pipe

Rectangular Pipe

SA335 P9 Rectangular Tube

Welded Tube

SA335 P9 High Pressure Pipe

Square Pipe

ASTM A335 P9 Square Pipe

Request Quote on Types of ASTM A335 P9 Pipe
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ASTM A335 P9 Pipe Specification

ASME SA335 Grade P9 Pipes Standard ASTM A335 P9, SA335 P9 (with IBR Test Certificate)
ASTM A335 Grade P9 Pipes Size 1/2” NB to 36” NB
P9 Grade Steel Pipes Thickness 3-12mm
ASME SA335 Grade P9 Pipes Schedules SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS, All Schedules
ASTM A335 Grade P9 Pipes Tolerance Cold drawn pipe: +/-0.1mm
Cold rolled pipe: +/-0.05mm
Craft Cold rolled and Cold drawn
ASME SA335 Grade P9 Pipes Type Seamless / ERW / Welded / Fabricated
P9 Grade Steel Pipes available in Form of Round, Square, Rectangular, Hydraulic Etc.
ASTM A335 Grade P9 Pipes Length Standard
Double &
In Cut length also.
ASME SA335 Grade P9 Pipes End Plain End, Beveled End, Treaded
Specialized in Large Diameter P9 Grade Steel Pipe
Additional Testing NACE TM0284, NACE MR 0175, NACE TM0177, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc.
Application Seamless Ferritic Alloy-Steel Pipes for High-Temperature Service

ASTM A335 Alloy Steel Grade P9 Pipes Chemical Composition

C Cr Mn Mo P S Si
0.05 – 0.15 0.90 – 1.10 0.30 – 0.60 0.90 – 1.10 0.025 max 0.025 max 0.25 – 1.00

ASTM A335 P9 Pipe Equivalent Materials

Standard/Type Equivalent Grade
ASME Pipe Standard SA335 P9
Fittings (Forging Grade) ASTM A182 F9
Fittings (Wrought Grade) ASTM A234 WP9
Plate Equivalent ASTM A387 Grade 9
JIS (Japanese Standard) STPA 26
BS (British Standard) 3604 P1 629-470 (historical reference)
DIN / EN (European Equivalent) X11CrMo9-1 or X12CrMo9-1 (e.g., EN 10216-2)

ASTM A335 P9 Pipe Size Chart

O.D (mm) Thickness (mm) O.D (mm) Thickness (mm) O.D (mm) Thickness (mm)
38.1 3.2 42.4 3.2 50.8 4.5
38.1 4.0 42.4 4.0 51.0 3.2
38.1 6.3 44.5 3.2 51.0 3.6
44.5 6.3 48.3 3.2 51.0 6.3
48.3 3.6 57.0 3.2 57.0 3.6
57.0 4.9 57.0 6.3 57.0 7.9
60.3 3.2 60.3 3.6 60.3 5.0
63.5 3.2 63.5 3.6 63.5 4.0
63.5 6.3 63.5 7.9 70.0 3.2
70.0 3.6 70.0 6.3 76.2 3.6
76.2 4.0 76.2 5.0 76.2 6.3
82.5 4.5 88.9 3.2 88.9 3.6
88.9 4.0 101.6 3.6 101.6 4.5
101.6 6.3 114.3 3.6 114.3 5.0
139.7 4.0 139.7 5.0 139.7 6.3

ASTM A335 P9 Seamless Pipes Mechanical Properties

Element Tensilee Strength, MPa Yield Strength, MPa Elongation, %
P9 380 min 205 min 30 min

Dimension Tolerance of ASTM A335 Gr P9 Pipe

ASTM A450 Hot rolled Outside Diameter, mm Tolerance, mm
OD≤101.6 +0.4/-0.8
101.6＜OD≤190.5 +0.4/-1.2
190.5＜OD≤228.6 +0.4/-1.6
Cold Drawn Outside Diameter, mm Tolerance, mm
OD＜25.4 ±0.10
25.4≤OD≤38.1 ±0.15
38.1＜OD＜50.8 ±0.20
50.8≤OD＜63.5 ±0.25
63.5≤OD＜76.2 ±0.30
76.2≤OD≤101.6 ±0.38
101.6＜OD≤190.5 +0.38/-0.64
190.5＜OD≤228.6 +0.38/-1.14
ASTM A530 & ASTM A335 NPS Outside Diameter, inch Tolerance, mm
1/8≤OD≤1-1/2 ±0.40
1-1/2＜OD≤4 ±0.79
4＜OD≤8 +1.59/-0.79
8＜OD≤12 +2.38/-0.79
OD>12 ±1%

SA335 Gr P9 Material Weight Chart

Size O.D I.D WT Weight/ft
3 / 4 1.06 0.824 0.113 1.13
6 6.625 6.407 0.109 7.59
1/2 0.84 0.622 0.109 0.85
1 1.316 1.049 0.134 1.68
1 1/2 1.90 1.610 0.145 2.72
5 5.563 5.187 0.188 10.80
1-1/4 1.67 1.380 0.140 2.27
2 2.375 2.157 0.109 2.64
2 1/2 2.875 2.635 0.120 3.53
4 4.5 4.260 0.120 5.62
3 1/2 4.0 3.760 0.120 4.98
3 3.50 3.260 0.120 4.34

SA335 Grade P9 Pipe Wall Thickness

NPS [DN] Designator Tolerance, % from Specified
  Over Under
1/8 to 2 1/2 [6 to 65] incl., all t/D ratios 20.0% 12.5%
Above 2 1/2 [65], t/D < or = 5% 22.5% 12.5%
Above 2 1/2 [65], t/D > 5% 15.0% 12.5%
(D = Specified Outside Diameter, t = Specified Wall Thickness)

Application of ASTM A335 GR P9 Pipes & Tubes

    • Petrochemical Industry
    • Chemical Industry
    • Oil and Gas Industry
    • Pulp & Paper Indusry
    • Power Plant Industry
    • Food Processing Industry
    • Pharmaceuticals Industry
    • Energy Industry
    • Aerospace Industry
Application Industries

FAQs About ASTM A335 P9 pipe

ASTM A335 Grade P9 is a chromium-molybdenum (chrome-moly) alloy steel material designed for seamless pipes used in high-temperature and high-pressure applications. It contains around 8–10% chromium and 0.9–1.1% molybdenum, which provide excellent strength, oxidation resistance, and durability. P9 material is commonly used in boilers, heat exchangers, refineries, and power generation systems.

The equivalent material for ASTM A335 Grade P9 includes ASME SA335 P9 (the ASME standard) and international equivalents such as DIN 1.7385, UNS S50400, and EN 10216-2 9CrMo. These materials share similar chemical composition and mechanical properties, making them interchangeable for critical high-temperature service applications.

Typical treatments include normalizing and tempering. For instance, ASTM A335 P9 pipes are normalized and tempered at approx. 1250°F (675°C).

Used in boilers, pressure vessels, high-pressure and high-temperature service in petrochemical, oil & gas, power generation, and other industrial sectors.

They must comply with the ASTM A335 / ASME SA335 standard, undergo nondestructive testing (NDE), hydrostatic testing, and meet specified tolerances and marking requirements.

  • Welding: SMAW, GTAW, or GMAW with P9-compatible filler (e.g., ER90S-B9).
  • Interpass Temp: 250–300°C for multi-pass welding.
  • Post-Weld Heat Treatment: 730–780°C for stress relief.
  • Inspection: Visual, radiography, or ultrasonic testing.
  • Preheat: 200–250°C to reduce stress.
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