ASTM A815 WP410
ASTM A815 WP410 Martensitic Stainless Steel Pipe Fittings
ASTM A815 WP410 pipe fittings are manufactured from martensitic stainless steel Grade 410, conforming to the ASTM A815 standard for wrought ferritic, austenitic, and martensitic stainless steel fittings used in pressure and high-temperature applications.
Grade WP410 (UNS S41000) is a hardenable martensitic stainless steel known for its high strength, wear resistance, and good corrosion resistance after proper heat treatment. It contains 11.5–13.5% chromium, providing moderate corrosion protection in mild environments and excellent mechanical properties under elevated temperatures.
Key Features
High tensile and yield strength.
Excellent resistance to scaling and oxidation up to 650°C.
Good corrosion resistance in mildly corrosive environments.
Can be hardened through heat treatment for improved wear resistance.
Magnetic in all conditions.
Cost-effective and versatile for mechanical and pressure service.
Specification
| Standard | ASTM A815 / ASME SA815 |
|---|---|
| Grade | WP410 |
| Material Type | Martensitic Stainless Steel |
| UNS Number | S41000 |
| W.Nr. | 1.4006 |
| Form | Elbows, Tees, Reducers, Caps, Stub Ends, Crosses |
| Manufacturing Process | Seamless / Welded / Fabricated |
| Size Range | ½” NB to 48” NB |
| Schedule | SCH 10S to SCH 160 / XXS |
| End Connection | Beveled, Plain, or Custom Ends |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM / ASME | WP410 |
| UNS | S41000 |
| EN | X12Cr13 |
| W.Nr | 1.4006 |
| JIS | SUS410 |
| BS | 410S21 |
Available Sizes
Seamless Fittings: ½” to 24” NB
Welded Fittings: ½” to 48” NB
Wall Thickness: SCH 10S, SCH 40S, SCH 80S, SCH 160, XXS
Custom Dimensions: Available upon request
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.08 – 0.15 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 11.5 – 13.5 |
| Nickel (Ni) | ≤ 0.75 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 480 MPa (min) |
| Yield Strength (0.2% Proof) | 275 MPa (min) |
| Elongation | 20% (min) |
| Hardness (Brinell) | ≤ 223 HB |
| Impact Toughness | Good (improves after tempering) |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1450°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 24.9 W/m·K at 100°C |
| Electrical Resistivity | 0.57 µΩ·m at 20°C |
Types of ASTM A815 WP410 Fittings
ASTM A815 WP410 Elbow
ASTM A815 WP410 Tee
ASTM A815 WP410 Reducers
ASTM A815 WP410 Caps
ASTM A815 WP410 Cross Fittings
ASTM A815 WP410 Nipples
ASTM A815 WP410 Couplings
ASTM A815 WP410 Stub Ends
Corrosion Resistance
ASTM A815 WP410 offers moderate corrosion resistance in:
Freshwater and Mild Industrial Atmospheres
Steam and Mild Acids
Oil and Petroleum Environments
However, it is not recommended for highly corrosive or chloride-rich environments. The corrosion resistance can be enhanced through polishing, hardening, and tempering treatments.
Heat Resistance
Resists oxidation and scaling up to 650°C (1200°F) in continuous service.
Maintains strength and hardness at moderately high temperatures.
Prolonged exposure between 400–600°C should be avoided to prevent embrittlement.
Heat Treatment
Annealing: 815–900°C followed by slow furnace cooling.
Hardening: 925–1010°C, followed by air or oil quenching.
Tempering: 150–370°C depending on required mechanical properties.
Heat treatment enhances both hardness and corrosion resistance.
Welding
Readily weldable using standard methods such as GTAW (TIG) or GMAW (MIG), though preheating and post-weld heat treatment are recommended.
Preheat: 200–300°C
Post-weld Tempering: 650–750°C to restore ductility and corrosion resistance.
Filler metals such as AWS E410 or E309 are recommended.
Fabrication
Easily machinable in the annealed condition.
Forming and bending operations require preheating to avoid cracking.
Post-forming annealing is recommended to relieve stresses.
Magnetic in all conditions and readily polishable.
Applications
Steam Turbine Components
Oil & Gas Refining Equipment
Power Generation Plants
Heat Exchangers
Pump & Valve Parts
Automotive Exhaust Systems
Mechanical and Structural Components