ASTM A815 / ASME SA815 WP S32750 Butt Weld Fittings Specification
Super Duplex Stainless Steel S32750 Butt Weld Pipe Fittings | Technical Specification PDF Download
The ASTM A815 / ASME SA815 WP S32750 Butt Weld Fittings Specification PDF provides a detailed technical reference for super duplex stainless steel S32750 butt weld pipe fittings. This specification covers chemical composition, mechanical properties, manufacturing requirements, dimensions and tolerances, testing and inspection, and typical applications in highly corrosive and high-pressure environments.
ASTM A815 & ASME SA815 Standard Overview:
ASTM A815 is the standard specification for wrought ferritic, ferritic/austenitic (duplex and super duplex), and martensitic stainless steel piping fittings for pressure service.
ASME SA815 is the ASME-adopted equivalent of ASTM A815 and is widely specified for piping systems designed in accordance with the ASME Boiler and Pressure Vessel Code (BPVC).
Both standards are technically equivalent.
Material Grade: WP S32750 (Super Duplex Stainless Steel)
- Grade Designation: WP S32750
- UNS Number: S32750
- Material Type: Super Duplex Stainless Steel
- Structure: Ferritic–Austenitic
- Product Form: Butt Weld Pipe Fittings
Super duplex stainless steel S32750 offers significantly higher strength and superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking compared with standard duplex grades.
Typical Chemical Composition (%, UNS S32750)
| Material | UNS | C max (%) | Mn max (%) | P max (%) | S max (%) | Si max (%) | Ni (%) | Cr (%) | Mo (%) | Cu (%) | N (%) | Other |
| Super Duplex Stainless Steel | S32750 | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 6.0–8.0 | 24.0–26.0 | 3.0–5.0 | 0.5 | 0.24–0.32 |
Mechanical Properties (Minimum Requirements)
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ASTM A815 WP S32750
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Tensile Strength: ≥ 800 MPa
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Yield Strength (0.2%): ≥ 550 MPa
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Elongation: ≥ 15%
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Hardness: ≤ 310 HB
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PREN (Pitting Resistance Equivalent Number): ≥ 40
PREN is commonly calculated as:
PREN = %Cr + 3.3 × %Mo + 16 × %NA PREN value above 40 indicates excellent resistance to localized corrosion in chloride environments.
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Manufacturing Requirements
ASTM A815 / ASME SA815 WP S32750 butt weld fittings are manufactured by:
- Hot forming or cold forming
- Solution annealing followed by rapid quenching
- Pickling and passivation
- Final machining and dimensional inspection
Manufacturing must ensure correct phase balance and corrosion resistance.
Available Butt Weld Fittings
- Elbows (45°, 90°, 180° – Long Radius / Short Radius)
- Tees (Equal & Reducing)
- Reducers (Concentric & Eccentric)
- Caps
- Stub Ends
- Custom Fabricated Super Duplex Fittings
Dimensional standards commonly applied: ASME B16.9, ASME B16.28, MSS SP-43.
Size Range, Wall Thickness & Dimensional Standards
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Size Range: 1/2″ NB – 48″ NB (DN15 – DN1200)
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Wall Thickness: SCH 10 / SCH 20 / SCH 40 / STD / XS / SCH 80 / SCH 160
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Dimensional Standards: ASME B16.9, ASME B16.28, MSS SP-43
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Manufacturing Process: hot forming, cold forming, welding, solution annealing
Fitting dimensions are governed by the applicable ASME or MSS dimensional standards.
Key dimensional controls include:
- End-to-end and center-to-end dimensions
- Outside diameter and wall thickness matching
- Bevel angle and end preparation for butt welding
- Ovality and alignment for proper fit-up
Testing & Inspection
Each ASTM A815 / ASME SA815 WP S32750 fitting may undergo:
- Chemical analysis
- Mechanical testing
- Impact testing (when required)
- Non-destructive testing (PT / UT / RT as specified)
- Dimensional and visual inspection
Mill Test Certificates (EN 10204 3.1) are normally supplied.
Applications
- Offshore Oil & Gas Platforms
- Subsea Pipelines
- Chemical & Petrochemical Processing
- Desalination Plants
- Marine & Shipbuilding
- High-Pressure & Highly Corrosive Piping Systems
WP S32750 butt weld fittings are used where maximum strength and corrosion resistance are required.
Download ASTM A815 / ASME SA815 WP S32750 Specification PDF
Click below to download the complete ASTM A815 / ASME SA815 WP S32750 Butt Weld Fittings Specification PDF, including detailed grade data, dimensions, and testing requirements.
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