ASTM A335 P22 Alloy Seamless Steel Tube in Power Generation, Petrochemical, High-temperature

ASTM A335 P22 is a premium ferritic alloy seamless steel pipe formulated with 2.25Cr-1Mo alloy composition, strictly manufactured in accordance with ASTM A335/SA335 standard for high-temperature and high-pressure service conditions. As a widely recognized heat-resistant alloy steel pipe, it features excellent high-temperature creep resistance, outstanding thermal stability, superior pressure-bearing capacity and ideal oxidation resistance. This seamless pipe is produced via hot rolling and cold drawing processes with no welding seam, ensuring uniform material structure, high dimensional accuracy and exceptional structural stability. It is the preferred material for critical piping systems in power generation, petrochemical, and industrial high-temperature equipment fields, adapting to long-term continuous operation under extreme high-temperature and high-pressure working environments.

1 Basic Information:

2.Chemical Composition (Weight %) 

3 Mechanical Properties (Room Temperature) 

4.Size & Tolerance

Outer Diameter Range: 21.3mm - 610mm (Customizable)

Wall Thickness Range: 2.0mm - 100mm (Customizable)

Standard Length: 5-7 meters per random length, fixed length customizable

OD Tolerance: ±1% (Compliant with ASME SA530)

Wall Thickness Tolerance: ±12.5%

Surface Condition: Pickled, polished, black finish as required

5.Testing Standards

All pipes undergo strict factory tests including hydrostatic testing, ultrasonic nondestructive testing (NDT), chemical composition analysis, mechanical property testing, dimensional inspection and surface quality inspection to ensure full compliance with ASTM A335 standard requirements.

Benefiting from its superior high-temperature and high-pressure resistance, ASTM A335 P22 seamless steel pipe is widely applied in core industrial high-temperature piping systems, mainly covering the following fields:

• Power Generation Industry: Superheater tubes, reheater tubes, boiler water wall tubes, main steam pipelines and high-pressure feedwater pipelines for thermal power plants and nuclear power auxiliary systems.
• Petrochemical Industry: High-temperature reaction furnace tubes, heat exchanger tubes, high-pressure oil and gas transmission pipelines, hydrogenation unit pipelines and refining equipment piping systems.
• Chemical Industry: High-temperature and high-pressure medium delivery pipelines for chemical reactors, steam transmission systems and corrosive medium conveying equipment.
• Industrial Furnace & Heat Exchange Equipment: High-temperature furnace piping, boiler auxiliary pipelines, heat exchanger and condenser high-pressure tubes.
• Energy & Heavy Industry: High-temperature pressure pipelines for metallurgical heating furnaces, cement kiln auxiliary systems and new energy thermal equipment.

Q1: What is the difference between ASTM A335 P22 and ordinary carbon steel pipes?

ASTM A335 P22 is a 2.25Cr-1Mo alloy steel pipe, while ordinary carbon steel pipes have no chromium and molybdenum alloy elements. P22 pipe has far better high-temperature creep resistance, oxidation resistance and pressure-bearing performance, stably working under 500-600°C high temperature and high pressure for a long time. Ordinary carbon steel pipes are only suitable for low-temperature and low-pressure conventional environments and cannot adapt to extreme industrial working conditions.

Q2: What heat treatment is adopted for A335 P22 pipes?

Standard A335 P22 seamless pipes adopt normalizing and tempering composite heat treatment. This process optimizes the internal metal structure, eliminates internal stress, significantly improves the toughness and high-temperature stability of the steel pipe, and avoids structural deformation and performance attenuation during long-term high-temperature operation.

Q3: Can you provide customized sizes and processing services?

Yes. We support customized outer diameter, wall thickness, fixed length cutting, bending, threading, surface treatment and deep processing services. All customized products strictly follow ASTM A335 standard specifications to ensure consistent performance and quality with standard products.

Q4: What quality certificates can you provide?

We can provide official factory test reports (MTC), ASTM standard compliance certificates, third-party inspection certificates (SGS, BV, TUV), and full set of shipping documents. All products are 100% tested before delivery to meet global engineering and procurement certification requirements.

Q5: What is the delivery time and packaging method?

Conventional standard sizes are in stock with 3-7 days fast delivery. Customized sizes take 10-20 working days. Products are packed with waterproof plastic film, woven bag and wooden pallet to prevent rust, collision and deformation during long-distance transportation, ensuring intact product delivery.

Q6: Is A335 P22 suitable for hydrogen environment service?

Absolutely yes. The 2.25Cr-1Mo alloy structure of P22 steel has excellent hydrogen embrittlement resistance and high-temperature hydrogen corrosion resistance, which is the preferred material for hydrogenation units and high-pressure hydrogen transmission pipelines in petrochemical industry, with stable service performance in long-term hydrogen environment.

How To Cooperate With Us?

Our address

Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China

Phone Number(WhatsApp/Wechat)

+8616622033809

E-mail

alisa@tjshenzhoutong.com

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