ASTM A335 Grade P9 Alloy Steel Seamless Pipe | U.S. Metals

Seamless Ferritic Alloy-Steel Pipe for High Temperature Service. This specification covers both nominal and minimum wall thickness.

U.S. Metals will supply all the Chrome Moly Alloy A335/SA335 Seamless P9 Piping that your company needs. Economic growth in the United States has led to an increased demand for P9 in recent years. We are not only capable of meeting the demand for this P9 high pressure steel pipe, also known as boiler steel pipe, but US Metals can also meet different needs for customized sizes and shapes.

U.S. Metals has an experienced and knowledgeable staff that can assist you with all your specialty alloy requirements, no matter how difficult the situation. Ideal for use in the oil and gas industries, P9 is suitable for bending, flanging, and similar forming operations, and for fusion welding.

U. S. Metals stocks P9 material to a 0.03% to 0.06% max vanadium. Our inventory is gradually being changed over to a 0.03% max Vanadium to meet the refinery industry tighter limits. Industry has discovered that Creep Cracking has the potential to form with the presence of Vanadium above 0.06%

U. S. Metals stocks ASTM /ASME A/SA P9 Pipe, Heater Tubes, Fittings, Flanges and Valves from ½” NPS through 30” NPS with wall thickness ranging from STD through XXH. Emphasis on our P9 inventory is our strength in the Heater Tube market. We are considered to have the largest inventory of P9 Heater Tubes. Heater Tubes typically range in sixes 4" NPS through 8” NPS from STD Wall Thickness through XXH. USM stock also consists of Minimum Wall Thickness pipe as well as material certified to ASTM/ASME A/SA 213 which is required by some heater designs. Go to the U. S. Metals comparison chart titled The Difference Between ASTM A213 and ASTM A335 for more information on the difference between P9 and T9.

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About ASTM A335 P9 Pipe

Trade Name: 9 Chrome
Grade: P9
UNS #: S
Pipe: A335/SA335
Forged/Bored Pipe: A369/SA369

A335/SA335 P9 is a seamless ferritic alloy-steel pipe used for high-temperature applications. These pipes are versatile and can be used to transmit water, oil and natural gas.

Key to the composition of chrome moly alloy P9 is the addition of chromium and molybdenum. Chromium, or chrome, improves high-temperature strength, increases oxidation resistance and raises the tensile, yield and hardness at room temperatures. Molybdenum increases the strength, elastic limit, resistance to wear, impact qualities and hardenability. It increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is also the most effective additive for increasing high temperature creep strength, or creep resistance. It also enhances the corrosion resistance of steel and inhibits pitting.

P9 Pipe Chemical Requirements

• Carbon - 0.15% max
• Manganese - 0.30% - 0.60%
• Phosphorus, max - 0.025%
• Sulfur, max - 0.025%
• Silicon, max – 0.25% - 1.00%
• Chromium - 8.00% - 10.00%
• Molybdenum - 0.90% - 1.10%

P9 Pipe Specifications

• Tensile strength, min, PSI, (MPa) – 60,000 (415)
• Yield Strength, min, (MPa) – 30,000 (205)

P9 Pipe Applications

A335/SA335 Seamless P9 pipe is often used in the oil and natural gas industry due to its high strength. P9’s great performance properties make it suitable for energy-related applications. P5 is suitable for:

• Refinery
• Machine building
• Oil and gas
• Power generation
• Petrochemicals
• Gas processing
• Fertilizer
• Sugar

Call U.S. Metals today to learn more about our Chrome Moly Alloy Seamless P9 Pipe inventory today.

Introduction: Seamless alloy steel pipes are critical components in the boiler industry, providing high temperature and pressure-resistant solutions for various applications. These pipes conform to the rigorous standards set by the ASTM A335, with grades such as P5, P9, and P11, ensuring superior performance, durability, and reliability in boiler operations.

The company is the world’s best A335 P9 Alloy Seamless Steel Pipe supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

ASTM A335 Standards: The ASTM A335 is a specification that covers seamless ferritic alloy-steel pipe for high-temperature service. It is widely recognized and adopted in the boiler industry due to its stringent requirements for mechanical properties, chemical composition, and testing procedures. These standards are essential in ensuring the quality and safety of the alloy steel pipes used in high-pressure and high-temperature boiler systems.

Materials and Grades: The alloy steel pipes are available in various grades, including P5, P9, and P11, each designed to meet specific temperature and pressure requirements. P5 offers excellent resistance to corrosion, making it suitable for moderate to high-temperature applications. P9 is known for its exceptional strength and toughness, making it ideal for demanding boiler environments. P11 boasts increased tensile strength and temperature resistance, making it suitable for even higher temperature applications.

Advantages: Seamless alloy steel pipes possess several advantages that make them a preferred choice in the boiler industry. First and foremost, their seamless construction eliminates the risk of leaks, ensuring a safe and efficient boiler operation. The alloying elements in these pipes enhance their resistance to oxidation and scaling, maintaining their structural integrity even in extreme conditions. The pipes' ability to withstand high pressure and temperature fluctuations without deformation or failure contributes to their long service life and low maintenance requirements.

Applications: Seamless alloy steel pipes, meeting ASTM A335 standards, find widespread usage in various boiler applications. They are commonly employed in power generation plants, where they serve as critical components for superheaters, reheaters, and waterwalls. The oil and gas industry also relies on these pipes for steam pipelines and high-temperature processing units. Additionally, they are used in refineries and petrochemical plants for applications that demand elevated temperature and pressure resistance.

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