Alloy Steel ASME SA335 P22 Seamless Pipe For Thermal Power Plant
Alloy Steel ASME SA335 P22 Seamless Pipe For Thermal Power Plant
ASTM A335 P22 alloy steel pipe (also designated ASME SA335 P22, UNS K21590) is a ferritic chromium-molybdenum alloy steel seamless pipe, manufactured per ASTM A335/A335M standard for high-temperature service. It is commonly called “2-1/4 Chrome” in industry. This seamless pipe is produced by hot-finished or cold-drawn processes, specially designed for long-term operation under elevated temperature and high-pressure conditions, widely used in power, petrochemical and coal-chemical industries.
Chemical Composition(%):
| Element | Content Range (wt %) |
| Carbon (C) | 0.05- 0.15 |
| Manganese (Mn) | 0.30-0.60 |
| Silicon (Si) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Chromium (Cr) | 1.90-2.60 |
| Molybdenum (Mo) | 0.87-1.13 |
| Nickel (Ni) | ≤ 0.50 |
Mechanical Properties:
| Tensile Strength (Ultimate) | ≥ 415 MPa (≥ 60,000 psi) |
| Yield Strength (0.2% Offset) | ≥ 205 MPa (≥ 30,000 psi) |
| Elongation (in 2" / 50mm) | ≥ 30% |
| Hardness (Brinell HB) | ≤ 163 HB (or ≤ 85 HRB) |
Main Features of ASTM A335 P22 Alloy Steel Seamless Pipes:
- Good Weldability
- Superior Creep Rupture Strength
- High-Temperature Oxidation Resistance
- Excellent Hardenability
- Resistance to Hydrogen Attack
Different Surface Finishes:
- Black / As-Rolled (Mill Scale)
- Pickled and Passivated (Bright / Bare)
- Shot-Blasted / Sand-Blasted
- Coated with Anti-Rust Oil/Varnish
Main Applications:
- Power Generation Industry
- thermal power & combined-cycle plants
- Petrochemical & Refinery Industry
- Coal-Chemical Industry
- Oil & Gas Industry
- Industrial Processing Plants
- Pressure vessels
- Hydrocracking and hydrotreating reactors
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