ASTM A815 WP27
ASTM A815 WP27 Stainless Steel Fittings
ASTM A815 WP27 is a high-performance wrought ferritic stainless steel alloy designed for demanding industrial applications, especially where corrosion resistance and heat resistance are essential. It offers excellent mechanical properties, weldability, and compatibility with various fabrication processes, making it ideal for piping and fitting assemblies in harsh environments.
Key Features:
High corrosion and oxidation resistance
Excellent weldability and formability
Suitable for high-temperature applications
Meets strict industry standards
Technical Specification
| Specification | Details |
|---|---|
| Standard | ASTM A815 / ASME SA815 |
| Grade | WP27 Duplex Stainless Steel |
| Product Type | Seamless / Welded / Fabricated Fittings |
| Size Range | ½” to 48” |
| Thickness | SCH 5S to XXS |
| Pressure Rating | Class 150 to 2500 |
| Forms | Buttweld Pipe Fittings |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S32750 / S32760 (Depending on variant)* |
| WNR | 1.4410 / 1.4501 |
| EN | X2CrNiMoN25-7-4 / X2CrNiMoCuWN25-7-4 |
| Trade Names | Super Duplex / Duplex 27Cr Series |
Chemical Composition (Typical)
| Element | Content (%) |
|---|---|
| C | ≤ 0.03 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.00 |
| P | ≤ 0.035 |
| S | ≤ 0.020 |
| Cr | 24 – 27 |
| Ni | 6 – 8 |
| Mo | 3 – 4 |
| N | 0.20 – 0.30 |
| Fe | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 750 MPa |
| Yield Strength | ≥ 550 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 32 HRC |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Melting Point | ~1350°C |
| Thermal Conductivity | 14 W/m-K |
| Electrical Resistivity | 0.85 µΩ-m |
| Modulus of Elasticity | 200 GPa |
Types of ASTM A815 WP27 Fittings
ASTM A815 WP27 Elbow
ASTM A815 WP27 Tee
ASTM A815 WP27 Reducers
ASTM A815 WP27 Caps
ASTM A815 WP27 Cross Fittings
ASTM A815 WP27 Nipples
ASTM A815 WP27 Couplings
ASTM A815 WP27 Stub Ends
Corrosion Resistance
Superior resistance to chloride and seawater environments
Excellent pitting & crevice corrosion resistance
Highly resistant to stress-corrosion cracking
Suitable for acidic & saline applications
Heat Resistance
Good strength and oxidation resistance up to 300–350°C
Maintains stability and toughness at moderate elevated temperatures
Heat Treatment
Solution annealing: 1040–1120°C
Rapid quenching recommended to maintain duplex structure
Welding
Excellent weldability using TIG / MIG / SMAW
Recommended Filler Metals: ER2594 / E2594
Avoid heat input that may lead to phase imbalance
Fabrication
Good formability and machinability
Higher strength may require stronger forming tools
Recommended to machine in solution-annealed condition
Applications
Offshore oil & gas platforms
Marine & seawater piping systems
Heat exchangers & pressure vessels
Chemical & petrochemical industries
Desalination plants
Pulp & paper industry
Mining & mineral processing
Power generation equipment