ASME SA335 P2 Alloy Steel Boiler Pipe
ASME SA335 P2 Alloy Steel Boiler Pipe - Properties and Equivalents
Complete material data for ASME SA335 P2 boiler pipe including chemical composition, mechanical properties, physical properties, and international equivalents.
Hot-rolled, cold-drawn, normalized, tempered
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ASME SA335 P2 Alloy Steel Boiler Pipe Introduction
ASME SA335 P2 is a ferritic alloy steel seamless pipe intended for high-temperature service in boilers and superheaters. It contains 0.5% chromium and 0.5% molybdenum, providing improved creep resistance and strength at elevated temperatures compared to carbon steel. The grade is governed by the ASME SA-335 specification, which is identical to ASTM A335 Grade P2. This steel is known for good weldability and moderate corrosion resistance. It is typically supplied in normalized and tempered condition, offering a balance of strength and ductility up to about 500°C (930°F).
ASME SA335 P2 Alloy Steel Boiler Pipe Chemical Composition
The chemical composition limits for ASME SA335 P2 pipe as per ASME SA335/SA335M. These values ensure the required high-temperature properties and weldability. Trace elements are controlled for optimal performance.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | 0.10–0.20 | |
| Manganese (Mn) | 0.30–0.61 | |
| Phosphorus (P) | ≤0.025 | |
| Sulfur (S) | ≤0.025 | |
| Silicon (Si) | 0.10–0.30 | |
| Chromium (Cr) | 0.50–0.81 | |
| Molybdenum (Mo) | 0.44–0.65 |
ASME SA335 P2 Alloy Steel Boiler Pipe Thermal and Electrical Physical Properties
Physical constants for 0.5Cr-0.5Mo steel (Grade P2). Values are typical and may vary with temperature and heat treatment. They are not part of the specification but useful for design.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 205 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | At 20°C (approximate) |
| Poisson's Ratio (ν) | 0.29 | — | At 20°C |
| Thermal Expansion (α) | 12.0 | µm/(m·°C) | 20–100°C, mean coefficient |
| Thermal Expansion (α) | 13.5 | µm/(m·°C) | 20–300°C, mean coefficient |
| Thermal Expansion (α) | 14.5 | µm/(m·°C) | 20–500°C, mean coefficient |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 100°C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρe) | 0.20 | µΩ·m | At 20°C |
ASME SA335 P2 Alloy Steel Boiler Pipe Mechanical Properties
Tensile and yield strength, elongation, and hardness based on ASME SA335 requirements at room temperature. These properties are for longitudinal specimen unless noted. Elevated-temperature properties are given in ASME BPVC Section II Part D.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 380–550 | MPa | At room temperature |
| Yield Strength (ReH) | ≥205 | MPa | 0.2% offset, room temperature |
| Elongation (A) | ≥30 (longitudinal) / ≥20 (transverse) | % | Gauge length 50 mm or 2 in. |
| Hardness | Not specified, typically ≤170 HBW | HBW | For reference |
ASME SA335 P2 Alloy Steel Boiler Pipe Direct Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A335/A335M | P2 | Identical to ASME SA335 P2 |
| USA | UNS | K11547 | Same chemical composition |
ASME SA335 P2 Alloy Steel Boiler Pipe Application Introduction
ASME SA335 P2 pipe is widely used in power plants and industrial boilers for high-temperature service up to about 500°C (930°F). It can be fabricated into various components requiring elevated temperature strength and oxidation resistance.
Product Applications: Superheater tubes, Reheater tubes, Steam piping, Heat exchanger tubes, Header pipes
Processed into products: Boiler tube panels, Steam pipe bends, High-temperature flanges, Pressure vessel nozzles
Application industries: Power Generation, Petrochemical, Oil & Gas, Chemical Processing, Industrial Boilers
ASME SA335 P2 Alloy Steel Boiler Pipe Similar/Alternate Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3458 | STPA 20 | 0.5Cr-0.5Mo steel, similar composition and properties |
| EU | EN 10216-2 | 13CrMo4-5 | Higher Cr (0.70–1.15%) and similar Mo, greater high-temperature strength |
| China | GB/T 5310 | 12CrMoG | Cr: 0.40–0.70, Mo: 0.40–0.55, very close match |
| Germany | DIN 17175 | 15Mo3 | Only Mo alloyed, no Cr; lower temperature capability |
Notes:
For welded construction, post-weld heat treatment (PWHT) is recommended per ASME B31.1 or relevant code. The material is not recommended for applications above 540°C (1000°F) due to graphitization susceptibility.
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