Grade A335 P22 is a specification for seamless ferritic alloy-steel pipe intended for high-temperature service. It is particularly suitable for applications involving high-pressure and high-temperature environments, such as in power plants and petrochemical plants.

ASTM A335 P22 seamless boiler tubes are particularly effective in the power generation, petrochemical, chemical processing, industrial boiler, oil and gas, and marine industries. Their ability to withstand high temperatures and corrosive environments ensures long-term reliability and efficiency in demanding applications.

Chemical Composition:

Grade	C	Mn	P	S	Si	Cr	Mo
A335 P22	0.05–0.15%	0.30-0.60%	≤ 0.25%	≤ 0.25%	0.50% maximum	1.90–2.60%	0.87–1.13%

Mechanical Properties:

Grade

Tensile Strength

Yield Strength

Elongation

Hardness

A335 P22

Minimum 415 MPa (60,200 psi)

Minimum 205 MPa (30,000 psi)

20% minimum

in 50 mm

≤ 220 HB

(Brinell Hardness)

Key Features:

High-Temperature Strength: Ensures reliable performance in high-temperature applications.
Oxidation Resistance: Provides excellent resistance to oxidation in demanding environments.
Creep Resistance: High resistance to creep, ensuring long-term reliability under continuous high-temperature exposure.
Durability: High tensile strength and toughness provide long service life in demanding conditions.
Weldability: Good weldability allows for easy fabrication and repair of boiler tubes.
Versatility: Suitable for a wide range of high-temperature and high-pressure applications across various industries.

Applications:

1. Petrochemical Industry

Refinery Equipment: Critical for refinery equipment that processes high-temperature and high-pressure steam.
Cracking Units: Suitable for catalytic cracking units where high temperatures and corrosion resistance are essential.
Heat Exchangers: Employed in high-temperature heat exchangers in petrochemical plants.

2. Marine Applications

Marine Boilers: Used in marine boilers for steam generation on ships and submarines.
Heat Exchangers: Suitable for marine heat exchangers exposed to high-pressure steam.
Engine Systems: Used in high-pressure steam systems in marine engine rooms.

3. Oil and Gas Industry

Offshore Platforms: Suitable for components in offshore platforms exposed to high temperatures and corrosive environments.
Downhole Tubing: Used in downhole tubing for oil and gas extraction where high-temperature strength is required.
Refinery Equipment: Ideal for refinery equipment processing sour gas and other corrosive substances at high temperatures.