Alloy Steel A335 P5 Pipe
High-Temperature 5% Chromium Ferritic Alloy Steel Pipes
ASTM A335 P5 is a seamless ferritic alloy-steel pipe designed specifically for high-temperature service. With a 5% Chromium and 0.5% Molybdenum content, it provides significantly better resistance to oxidation and corrosion than standard carbon steel. This grade is a staple in the petrochemical and power industries, offering excellent creep strength and durability in high-pressure steam and refinery process environments.
Technical Specifications
| Feature | Details |
|---|---|
| Standards | ASTM A335 / ASME SA335 |
| Grade | P5 (5% Cr, 1/2% Mo) |
| Size Range | 1/8" NB to 24" NB (Seamless Only) |
| Schedules | SCH 40, SCH 80, SCH 160, SCH XXS |
| Manufacturing | Hot Rolled / Cold Drawn / Heat Treated |
| Heat Treatment | Annealed, Normalized and Tempered |
Mechanical Properties
| Property | Value (Min) |
|---|---|
| Yield Strength (0.2% Offset) | 205 MPa (30,000 psi) |
| Tensile Strength | 415 MPa (60,000 psi) |
| Elongation | 30% |
| Hardness (Brinell) | Max 163 HBW |
Chemical Composition (%)
| Element | A335 P5 Percentage |
|---|---|
| Carbon (C) | 0.15 max |
| Chromium (Cr) | 4.00 - 6.00 |
| Molybdenum (Mo) | 0.45 - 0.65 |
| Manganese (Mn) | 0.30 - 0.60 |
| Silicon (Si) | 0.50 max |
| Phosphorus (P) | 0.025 max |
| Sulphur (S) | 0.025 max |
Features and Benefits of Alloy Steel P5 Pipe
- Enhanced resistance to oxidation at temperatures up to 600°C
- Superior corrosion resistance against sulfur-containing fluids in refineries
- High creep-rupture strength for long-term safety in thermal plants
- Excellent structural stability under continuous high-pressure cycles
- Highly effective in resisting hydrogen-induced cracking in process units
- Precision seamless manufacturing ensuring uniform wall thickness
- Compatible with specialized high-temperature welding procedures
- Cost-effective balance between carbon steel and high-chrome grades
Applications & Uses
Process Heaters
Standard material for heater tubes and furnace piping in chemical processing.
Refinery Units
Applied in delayed coker, hydro-processing, and catalytic cracking units.
Power Plants
Essential for steam transport lines and high-temperature boiler accessories.