ASME SA335 P5 Seamless Alloy Steel Pipe Material
ASME SA335 P5 Seamless Alloy Steel Pipe for High-Temperature Service
Complete material data for ASME SA335 Grade P5 seamless ferritic alloy-steel pipe used in high-temperature applications such as power plants and refineries.
Hot-finished or cold-drawn; followed by heat treatment (typically normalizing and tempering); welding, bending, and forming possible after appropriate heat treatment.
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ASME SA335 P5 Seamless Alloy Steel Pipe Introduction
ASME SA335 P5 is a seamless ferritic alloy steel pipe designed for high-temperature service, containing nominally 5% chromium and 0.5% molybdenum. It offers excellent creep resistance and oxidation resistance at elevated temperatures up to approximately 600 °C (1112 °F). The material is widely used in power generation, petrochemical, and refinery industries for superheater tubes, reheaters, and high-pressure steam piping. It is typically supplied in the normalized and tempered condition, ensuring a homogeneous microstructure and reliable mechanical properties. The pipe is manufactured in accordance with the ASME Boiler and Pressure Vessel Code, Section II, Part A specification SA335/SA335M, which covers nominal wall and minimum wall seamless ferritic alloy-steel pipe for high-temperature service.
ASME SA335 P5 Seamless Alloy Steel Pipe Chemical Composition
The following chemical composition limits are prescribed by ASME SA335/SA335M for Grade P5. The alloy is a 5Cr-0.5Mo ferritic steel with controlled levels of carbon, manganese, silicon, phosphorus, and sulfur. Trace elements are not specified but may be adjusted to enhance high-temperature properties.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.15 max | Maximum permissible |
| Manganese (Mn) | 0.30 - 0.60 | Range |
| Phosphorus (P) | 0.025 max | Maximum; for product analysis slightly higher limit may apply |
| Sulfur (S) | 0.025 max | Maximum |
| Silicon (Si) | 0.50 max | Maximum |
| Chromium (Cr) | 4.00 - 6.00 | Key alloying element for oxidation resistance |
| Molybdenum (Mo) | 0.45 - 0.65 | Key alloying element for creep strength |
ASME SA335 P5 Seamless Alloy Steel Pipe Thermal and Electrical Physical Properties
The following physical properties are typical for 5Cr-0.5Mo (P5) alloy steel in the heat-treated condition. Values are representative for engineering calculations and may vary slightly with exact composition, heat treatment, and temperature. Thermal expansion and conductivity data are given at selected temperatures.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.75 - 7.80 | g/cm³ | At room temperature |
| Elastic Modulus (E) | 200 | GPa | At room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.29 | - | At room temperature |
| Thermal Expansion Coefficient (α) | 11.2 | 10⁻⁶/K | 20 °C to 100 °C |
| Thermal Expansion Coefficient (α) | 11.9 | 10⁻⁶/K | 20 °C to 200 °C |
| Thermal Expansion Coefficient (α) | 12.4 | 10⁻⁶/K | 20 °C to 300 °C |
| Thermal Expansion Coefficient (α) | 12.8 | 10⁻⁶/K | 20 °C to 400 °C |
| Thermal Expansion Coefficient (α) | 13.2 | 10⁻⁶/K | 20 °C to 500 °C |
| Thermal Conductivity (λ) | 36.4 | W/m·K | At 100 °C |
| Thermal Conductivity (λ) | 36.4 | W/m·K | At 200 °C |
| Thermal Conductivity (λ) | 35.6 | W/m·K | At 300 °C |
| Thermal Conductivity (λ) | 34.0 | W/m·K | At 400 °C |
| Thermal Conductivity (λ) | 32.6 | W/m·K | At 500 °C |
| Specific Heat Capacity (cp) | 460 - 500 | J/kg·K | At room temperature to 500 °C |
| Electrical Resistivity (ρ_e) | 0.45 | µΩ·m | At room temperature |
ASME SA335 P5 Seamless Alloy Steel Pipe Mechanical Properties
The mechanical properties listed below are the minimum requirements per ASME SA335/SA335M for Grade P5 seamless pipe. Tensile testing is performed on longitudinal or transverse specimens at room temperature. The standard does not specify hardness, impact, or bend test requirements for this grade; however, typical hardness values are provided as a supplementary reference.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Tensile Strength (Rm) | 415 - 585 | MPa (60 - 85 ksi) | Room temperature, transverse or longitudinal specimen |
| Yield Strength (ReH, min) | 205 | MPa (30 ksi) | 0.2% offset method, room temperature |
| Elongation (A, min, longitudinal) | 26 | % | In 2 in. (50 mm) gauge length; applies for wall thickness ≥ 5/16 in. (7.94 mm); for thinner walls use formula per standard |
| Elongation (A, min, transverse) | 19 | % | In 2 in. (50 mm) gauge length; for strip tests or transverse specimens |
ASME SA335 P5 Seamless Alloy Steel Pipe Completely Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASME SA335 / ASTM A335 | P5 | Original specification; identical chemistry and properties |
| Europe | EN 10216-2 | X11CrMo5 (1.7362) | Seamless steel tubes for pressure purposes; equivalent high-temperature properties |
| Japan | JIS G3458 | STPA25 | Alloy steel pipes for high-temperature service; similar 5Cr-0.5Mo composition |
| China | GB/T 5310 | 12Cr5Mo (1Cr5Mo) | Seamless steel tubes and pipes for high-pressure boiler |
ASME SA335 P5 Seamless Alloy Steel Pipe Application Introduction
ASME SA335 P5 pipe is specifically designed for high-temperature, high-pressure applications requiring good creep strength and resistance to oxidation and corrosion in steam and flue-gas atmospheres. Typical operating temperatures range from 450 °C to 600 °C. The material can be easily formed, welded, and bent, but welding procedures must include preheating and post-weld heat treatment (PWHT) to avoid cracking and to restore toughness. Common end uses span power generation, oil refining, and petrochemical processing.
Product Applications: Superheater and reheater tubes in utility boilers, Main steam lines and high-pressure steam piping, Furnace tubes and convection section tubes in refineries, Heat exchanger tubes in high-temperature service, Piping assemblies in chemical plants
Processed into products: Seamless pipes and tubes, Pipe bends and elbows (hot or cold formed), Headers and manifolds, Tube-to-tubesheet welded joints, Piping spools, Nozzles and fittings for high-temperature pressure vessels
Application industries: Power generation (fossil fuel and nuclear), Oil and gas refining, Petrochemical and chemical processing, Boiler and heat exchanger manufacturing, Pipeline systems for high-temperature fluids
ASME SA335 P5 Seamless Alloy Steel Pipe Similar or Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASME SA335 / ASTM A335 | P11 (1.25Cr-0.5Mo-Si) | Lower chromium but similar high-temperature behavior; commonly used for moderate-temperature steam lines |
| USA | ASME SA335 / ASTM A335 | P22 (2.25Cr-1Mo) | Higher molybdenum for improved creep strength; widely used in power plants |
| USA | ASME SA335 / ASTM A335 | P9 (9Cr-1Mo) | Higher chromium content for better oxidation resistance; used in higher temperature corrosive environments |
| Europe | EN 10216-2 | 13CrMo4-5 (1.7335) | 1Cr-0.5Mo grade; economical alternative for lower temperatures |
Notes:
Welding of P5 steel requires careful control of preheat (200-300 °C), interpass temperature, and post-weld heat treatment (typically 700-750 °C) to avoid martensite formation and stress-corrosion cracking. The material is not recommended for applications involving hydrogenattack at elevated temperatures without additional design considerations. For sour service or wet H₂S environments, compliance with NACE MR0175/ISO 15156 may be required. When ordering, the supplementary requirements of the specification, such as product analysis, non-destructive testing, or marking, should be specified.
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