ASTM A815 WP S31803 Butt Weld Fittings Specification
Duplex Stainless Steel S31803 Butt Weld Fittings | Technical Specification PDF Download
The ASTM A815 WP S31803 Butt Weld Fittings Specification PDF provides a comprehensive technical overview of duplex stainless steel S31803 (UNS S31803 / Duplex 2205) butt weld fittings. It covers chemical composition, mechanical properties, manufacturing process, dimensional tolerances, testing requirements, and applicable industries such as oil & gas, petrochemical, offshore, shipbuilding, and pressure piping systems.
ASTM A815 WP S31803 Overview
ASTM A815 is an internationally recognized specification for wrought austenitic, ferritic, and duplex stainless steel butt weld pipe fittings.
WP S31803 refers to duplex stainless steel grade S31803, offering an excellent combination of high strength, corrosion resistance, and resistance to stress corrosion cracking, making it ideal for demanding service environments.
Material Grade: Duplex Stainless Steel S31803
- UNS Number: S31803
- Common Name: Duplex 2205
- Material Type: Duplex Stainless Steel
- Product Form: Butt Weld Pipe Fittings
Duplex S31803 combines approximately equal proportions of austenite and ferrite, providing superior mechanical strength compared to standard austenitic stainless steels while maintaining excellent corrosion resistance.
Chemical Composition (Typical, %)
- Chromium (Cr): 21.0 – 23.0
- Nickel (Ni): 4.5 – 6.5
- Molybdenum (Mo): 2.5 – 3.5
- Nitrogen (N): 0.08 – 0.20
- Carbon (C): ≤ 0.03
- Manganese (Mn): ≤ 2.00
- Silicon (Si): ≤ 1.00
- Phosphorus (P): ≤ 0.030
- Sulfur (S): ≤ 0.020
Mechanical Properties (Minimum Requirements)
- Tensile Strength: ≥ 620 MPa
- Yield Strength (0.2% Offset): ≥ 450 MPa
- Elongation: ≥ 25%
- Impact Test: As specified by ASTM A815
These properties ensure excellent performance under high pressure and corrosive environments.
Manufacturing Process
ASTM A815 WP S31803 butt weld fittings are typically manufactured by:
- Hot forming or cold forming
- Solution heat treatment
- Pickling and passivation
- Final machining and dimensional inspection
All fittings are produced in accordance with ASTM A815 and relevant ASME dimensional standards.
Available Butt Weld Fittings
- Elbows (45°, 90°, 180° – LR / SR)
- Tees (Equal & Reducing)
- Reducers (Concentric & Eccentric)
- Caps
- Stub Ends
- Custom Fabricated Fittings
Testing & Inspection
Each ASTM A815 WP S31803 fitting may undergo:
- Chemical analysis
- Mechanical testing
- Non-destructive testing (NDT)
- Dimensional inspection
- Hydrostatic or pressure-related testing (if required)
Mill Test Certificates (EN 10204 3.1) are typically supplied.
Applications
- Oil & Gas Pipelines
- Petrochemical Processing
- Offshore Platforms
- Marine & Shipbuilding
- Chemical Plants
- Pressure Vessels and Heat Exchangers
Duplex S31803 butt weld fittings are widely used where both strength and corrosion resistance are critical.
Download ASTM A815 WP S31803 Specification PDF
Click below to download the complete ASTM A815 WP S31803 Butt Weld Fittings Specification PDF, including detailed tables, tolerances, and inspection requirements.
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