Alloy Steel A335 P1 Pipe
Carbon-Molybdenum Seamless Alloy Steel Pipe
ASTM A335 P1 is a seamless ferritic alloy-steel pipe designed for high-temperature service. As a Carbon-Molybdenum grade, the addition of Molybdenum increases the strength of the steel as well as its resistance to creep at elevated temperatures. It is commonly used in the power industry and petrochemical plants for steam lines and heat exchangers operating at moderate high-temperature conditions.
Technical Specifications
| Feature | Details |
|---|---|
| Standard | ASTM A335 / ASME SA335 |
| Grade | P1 (Carbon-Molybdenum) |
| Size Range | 1/4" NB to 36" NB |
| Schedule | SCH 40, SCH 80, SCH 160, SCH XXS |
| Manufacturing | Seamless (Hot Finished or Cold Drawn) |
| Heat Treatment | Full or Isothermal Anneal / Normalized & Tempered |
Mechanical Properties
| Property | ASTM A335 P1 Value (Min) |
|---|---|
| Tensile Strength | 55,000 psi (380 MPa) |
| Yield Strength | 30,000 psi (205 MPa) |
| Elongation (in 2 in.) | 30% |
Chemical Composition (%)
| Element | Percentage |
|---|---|
| Carbon (C) | 0.10 - 0.20% |
| Manganese (Mn) | 0.30 - 0.80% |
| Molybdenum (Mo) | 0.44 - 0.65% |
| Silicon (Si) | 0.10 - 0.50% |
Features and Benefits of A335 P1
- High creep strength at temperatures up to 450°C
- Enhanced elasticity and durability under moderate thermal stress
- Cost-effective alloy choice for mid-range high-temperature systems
- Excellent weldability using standard pre-heating procedures
Applications & Uses
Steam Lines
Ideal for conveying high-pressure steam in power plant boiler systems.
Oil Refineries
Applied in thermal cracking units and heat exchanger components.
Power Gen
Crucial for auxiliary piping in thermal power generation facilities.