Product Description
ASTM A335 P22 pipe
ASTM A335 P22 pipe is a seamless ferritic chrome-moly alloy steel pipe engineered for extreme high-temperature and high-pressure service. Crafted from 2.25% chromium and 1% molybdenum steel, it delivers unmatched creep resistance, thermal stability, and oxidation resistance, outperforming standard carbon steel in harsh industrial environments. As a top-tier solution for critical heat-intensive systems, our ASTM A335 P22 pipe ensures long-term reliability and safety for your high-stakes projects.
About Jiangsu Cunrui Metal Products Co., Ltd.
Founded in 2006 and based in Wuxi, Jiangsu, Jiangsu Cunrui Metal Products Co., Ltd. is a professional manufacturer and exporter specializing in high-grade steel products. Our main products include alloy steel pipes, stainless steel pipes, carbon steel pipes, and custom metal components. With over 19 years of industry experience, a 180-million-CNY investment, and annual sales exceeding 2 billion CNY, we operate a modern, integrated factory with advanced production and testing equipmentJiangsu Cunrui Metal Products Co., Ltd..
What Is ASTM A335 P22 Pipe?
ASTM A335 P22 pipe is a seamless ferritic chrome-moly alloy steel pipe engineered for reliable performance in high-temperature, high-pressure environments. Its carefully balanced composition delivers the critical properties required for long-term service in power generation and petrochemical systems:
✅ Chromium (Cr 2.0–2.6%) – provides oxidation resistance and high-temperature corrosion protection
✅ Molybdenum (Mo 0.9–1.1%) – enhances creep strength and long-term stability under sustained heat and pressure
✅ Carbon (C ≤0.15%) – maintains optimal strength without compromising weldability
Unlike austenitic stainless steels, ASTM A335 P22 relies on its normalized and tempered ferritic structure, offering excellent thermal stability and consistent mechanical properties at elevated temperatures without the risk of sigma-phase embrittlement.
From our supply experience, customers choose this grade when they need reliable creep resistance rather than maximum room-temperature strength – making it ideal for boiler tubes, steam lines, and high-temperature process piping.
At Jiangsu Cunrui Metal Products Co., Ltd., we supply ASTM A335/ASME SA335-compliant P22 seamless pipes in standard and custom sizes, backed by full mill traceability, PMI verification, and precision cutting services.
Whether you're fabricating boiler systems, petrochemical heaters, or power plant piping, our ASTM A335 P22 pipe delivers the reliable high-temperature strength and long-term dimensional stability your project demands.
Chemical Composition (wt%, ASTM A335 P22)
| Element | Specification (wt%) |
|---|---|
| C | 0.05–0.15 |
| Cr | 2.00–2.60 |
| Mo | 0.90–1.10 |
| Mn | 0.30–0.60 |
| Si | ≤0.50 |
| S | ≤0.030 |
| P | ≤0.030 |
Physical & Mechanical Properties (Room Temperature, Normalized + Tempered Condition)
| Property | Value |
|---|---|
| Density | ~7.8 g/cm³ |
| Melting Range | ~1,425–1,510 °C |
| Thermal Conductivity | ~35 W/m·K (20°C) |
| Coefficient of Thermal Expansion | ~12.3 µm/m·°C (20–500°C) |
| Tensile Strength | ≥415 MPa (60 ksi) |
| Yield Strength (0.2% Offset) | ≥205 MPa (30 ksi) |
| Elongation (50mm gauge) | ≥30% |
| Hardness | ≤163 HBW / ≤170 HV |
| Modulus of Elasticity | ~200 GPa |
Properties Of ASTM A335 P22 Pipe
- Outstanding High-Temperature Creep & Rupture Strength
ASTM A335 P22 pipe is alloyed with 2.25% chromium and 1% molybdenum, forming a stable ferritic structure after normalization and tempering. This gives it exceptional resistance to creep deformation and long-term rupture at continuous operating temperatures up to 600°C, far outperforming standard carbon steel pipes that degrade rapidly above 425°C. It is purpose-built for sustained high-pressure service in boiler and power plant systems.
- Excellent Oxidation & Corrosion Resistance
The chromium content forms a protective, self-healing oxide layer on the pipe's surface, significantly reducing oxidation and scaling at elevated temperatures. This makes it highly resistant to high-temperature corrosion in steam, flue gas, and mildly acidic environments, extending service life in harsh industrial settings where carbon steel would fail prematurely.
- Balanced Weldability & Fabrication Performance
With a controlled carbon content (≤0.15%) and optimized alloy composition, ASTM A335 P22 offers good weldability with standard procedures, provided post-weld heat treatment is applied to restore mechanical properties. It also exhibits excellent ductility and toughness, supporting common fabrication processes like bending, forming, and machining without cracking or brittleness issues.
- Stable Thermal & Mechanical Consistency
Thanks to its carefully balanced microstructure, this pipe maintains consistent mechanical properties across a wide temperature range, from cryogenic conditions up to its maximum service temperature. It also features a low coefficient of thermal expansion and high thermal conductivity, minimizing thermal stress and fatigue failure in systems subject to frequent temperature cycling.
Applications of ASTM A335 P22 Pipe
Engineered for the most demanding high-temperature, high-pressure environments, ASTM A335 P22 pipe is the go-to choice across industries where reliability is non-negotiable. It is widely used in power generation plants for main steam lines, boiler superheaters, reheaters, and header systems, where it withstands continuous thermal cycling and extreme pressure. In petrochemical and refining facilities, it serves as critical process piping for furnaces, heaters, and reactor feed lines, resisting oxidation and corrosion from hot hydrocarbons and process fluids. Additionally, it is the preferred material for high-temperature pipelines in oil and gas surface operations, industrial heat exchangers, and chemical processing plants, offering long-term dimensional stability and safety for mission-critical systems.
Why Choose ASTM A335 P22 Pipe Over Other Materials?
A common question we hear is: "Why not use carbon steel or another alloy pipe?"
From practical experience, ASTM A335 P22 pipe is typically selected when:
✅ Operating temperatures exceed 425°C and remain consistently high
✅ Creep strength and long-term pressure resistance are critical
✅ Oxidation and high-temperature scaling must be prevented
✅ Weldability and post-weld stability are required for field fabrication
We've seen customers initially use lower-cost carbon steel or standard alloy pipes, only to face:
❌ Rapid material degradation and scaling under continuous heat
❌ Reduced service life and unexpected failures in high-pressure systems
❌ Increased maintenance costs and unplanned downtime
❌ Risk of weld cracking or brittleness in thermal cycling conditions
Switching to ASTM A335 P22 pipe often improves system reliability, extends component lifespan, and reduces long-term operational costs.
Why Our Clients Stay with Us
Over the years, our ASTM A335 P22 pipe has earned consistent praise from customers worldwide for its reliable performance, strict quality control, and on-time delivery. Many of them have grown into long-term partners, returning to us for repeat orders and new projects year after year.
We believe great partnerships are built on trust and transparency, so we always welcome you to visit our factory and inspect our production processes, testing facilities, and finished products firsthand. Our doors are always open, and we'd be happy to walk you through our quality management system and discuss how we can support your next project.
If you'd like to schedule a visit or learn more about how we can meet your alloy steel pipe needs, feel free to reach out to our team anytime.
