ASTM A335 Alloy Steel Seamless Pipe-SHANDONG MULTISTEEL CO.,LTD

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Descriptions of ASTM A335 Pipe

ASTM A335 refers to a specification for seamless ferritic alloy steel pipes designed for high-temperature service. This standard outlines the requirements for materials used in environments where extreme heat and pressure are common. The pipe are often called chrome moly pipes due to their high chromium and molybdenum content. These elements enhance the material’s strength, corrosion resistance, and ability to withstand elevated temperatures. The specification covers multiple grades such as P5, P9, P11, P22, P91, each tailored to specific applications.

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Specifications of A335 Alloy Steel Pipe

Outer diameter (OD): 20mm to 1000mm

Wall thickness (WT): 2mm to 100mm

Length: 6m, 12m,custom length or standard length

Material options: P5, P9, P11, P22, P91

A335 Material Composition & Mechanical Properties

Grade	Chemical composition(%)
Grade	C	Si	Mn	Cr	Mo	P	S	Al	Cu	V
P5	0.05-0.15	0.50-0.80	0.30-0.60	4.50-6.00	0.90-1.20	≤ 0.025	≤ 0.025	≤ 0.030	≤ 0.25	≤ 0.10
P9	0.05-0.15	0.50-0.80	0.30-0.60	4.00-6.00	0.90-1.20	≤ 0.025	≤ 0.025	≤ 0.030	≤ 0.25	≤ 0.10
P22	0.05-0.15	0.50-0.80	0.30-0.60	2.25-2.75	0.90-1.10	≤ 0.025	≤ 0.025	≤ 0.020	≤ 0.25
P91	0.05-0.15	0.20-0.50	0.30-0.60	8.00-9.50	0.85-1.05	≤ 0.020	≤ 0.010	≤ 0.050	≤ 0.25	0.18 – 0.25

Grade	Mechanical properties
Grade	Tensile Strength	Yield strength	Elongation	Hardness	Impact toughness
P5	485 – 620 MPa	≥ 205 MPa	≥ 20% (on a 50 mm long specimen)	HB : ≤ 250 HRC : ≤ 25	Meets the requirements of the Charpy impact test, usually a minimum requirement at -20°C.
P9	485 – 620 MPa	≥ 205 MPa
P22	415 – 585 MPa	≥ 205 MPa
P91	585 – 725 MPa	≥ 415 MPa

Applications Of ASTM A335 Alloy Steel Pipe

Oil and gas industry: Used in oil pipelines, high-temperature oil and gas transmission pipelines.
Chemical industry: high temperature pipeline system for chemical fertilizer and chemical plant.
Power industry: Used in boilers, steam pipelines, heat exchangers and other equipment.
Other high temperature applications: suitable for steel, ships, aviation and other fields.

FAQs

1. What is A335 material?

ASTM A335 is a specification for seamless ferritic alloy-steel pipe intended for high-temperature service. These pipes are made from alloy steel with elements like chromium and molybdenum to enhance their strength, resistance to heat, and corrosion resistance. ASTM A335 pipes are primarily used in applications such as boilers, superheaters, and heat exchangers in power plants, oil refineries, and chemical industries, where high pressure and temperature are involved.

2. What is the difference between ASTM A333 and A335?

ASTM A333 is a standard specification for seamless and welded carbon and alloy steel pipes for low-temperature service, typically used in environments where temperatures drop below -45.5°C.
ASTM A335 is a specification for high-temperature service, designed to withstand temperatures up to 600°C and is often used in power generation and high-pressure applications like boilers and steam lines.

3. What are the grades of ASTM A335?

ASTM A335 includes several grades, each designed for different applications and temperature resistance. The most common grades are:

P5: Chromium-molybdenum alloy steel for high-temperature service.
P9: Higher chromium-molybdenum alloy steel for steam boilers and superheaters.
P11: Contains 1% chromium and 0.5% molybdenum, commonly used for power plants and refineries.
P22: Higher chromium and molybdenum content, used for higher pressure and temperature applications.
P91: High-strength alloy with 9% chromium, used in ultra-high-temperature and pressure applications.