ASTM A815 WP430
ASTM A815 WP430 Wrought Stainless Steel Pipe Fittings
ASTM A815 WP430 refers to wrought ferritic stainless steel pipe fittings manufactured under ASTM A815 specification. These fittings are produced from UNS S43000 (Grade 430) stainless steel, a corrosion-resistant ferritic alloy containing about 16% chromium, offering strong resistance to mild corrosive environments, oxidation, and heat scaling.
ASTM A815 WP430 fittings are used in applications where moderate corrosion resistance, thermal stability, and cost-effectiveness are required. They are suitable for industrial exhaust systems, flue gas systems, heat exchangers, food industry piping, and decorative architectural applications.
With excellent resistance to stress corrosion cracking and oxidation at elevated temperatures, WP430 is a preferred choice in chemical plants, refinery systems, food processing equipment, and thermal processing units.
Key Features
Made from UNS S43000 ferritic stainless steel
Good resistance to oxidation & scaling at high temperatures
Better stress-corrosion cracking resistance vs. austenitic grades
Excellent formability & moderate toughness
Cost-effective alternative to 304 stainless steel
Magnetic ferritic stainless structure
Stable microstructure with low expansion under heat
Specification
| Property | Details |
|---|---|
| Standard | ASTM A815 / A815M |
| Grade | WP430 |
| Material Type | Ferritic Stainless Steel |
| UNS | S43000 |
| Equivalent | AISI 430 Stainless Steel |
| Manufacturing Process | Welded / Seamless |
| Form | Butt-Weld Pipe Fittings |
| Sizes | ½” to 48” (DN15 – DN1200) |
| Thickness | SCH 10 to SCH XXS |
| End Finish | Bevelled (BW) |
| Surface Finish | Mill Finish / Pickled & Passivated |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S43000 |
| ASTM | A815 WP430 |
| AISI | 430 |
| EN / W.Nr | 1.4016 |
| JIS | SUS430 |
Available Sizes
Pipe Size: ½” to 48”
Wall Thickness: SCH 10 – SCH XXS
Configurations: Elbows, tees, reducers, caps, stub ends, crosses
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 16.0 – 18.0 |
| Carbon (C) | ≤ 0.12 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Nickel (Ni) | ≤ 0.5 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 450 MPa |
| Yield Strength | ≥ 280 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 202 HBW |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.7 – 7.8 g/cm³ |
| Melting Range | 1500°C – 1510°C |
| Modulus of Elasticity | ~200 GPa |
| Thermal Conductivity | Higher than 300-series stainless steels |
| Coefficient of Thermal Expansion | Lower than austenitic grades |
Types of ASTM A815 WP430 Fittings
ASTM A815 WP430 Elbow
ASTM A815 WP430 Tee
ASTM A815 WP430 Reducers
ASTM A815 WP430 Caps
ASTM A815 WP430 Cross Fittings
ASTM A815 WP430 Nipples
ASTM A815 WP430 Couplings
ASTM A815 WP430 Stub Ends
Corrosion Resistance
WP430 provides excellent resistance to:
Atmospheric corrosion
Freshwater & mildly corrosive chemicals
Food processing & mild alkali environments
Organic acids and industrial gases
Not recommended for high-chloride or acidic environments.
Heat Resistance
Good oxidation & scale resistance up to ~815°C
Suitable for exhaust systems, heat exchangers & furnace parts
Low thermal expansion reduces thermal fatigue cracking
Heat Treatment
Annealing: 760°C – 815°C followed by air cooling
Stress-relief recommended after heavy forming
Avoid rapid quenching to minimize brittleness
Welding
Can be welded by standard processes (GTAW, GMAW, SMAW)
Recommended filler metal: matching ferritic grade
Post-weld annealing advised in critical service to restore toughness
Avoid rapid cooling after welding
Fabrication
Good formability & machinability
Can be roll-formed & press-braked
Avoid severe cold-work without annealing
Magnetic — aids in handling & automation
Applications
Chemical processing lines & equipment
Food & beverage industry piping
Architectural handrails & piping systems
Industrial exhaust & furnace components
Heat exchangers & heater elements
Decorative stainless steel systems
Automotive & industrial muffler equipment
Flue gas & chimney systems