ASTM A815 WPS 32760
ASTM A815 WPS 32760 Super Duplex Stainless Steel Pipe Fittings
ASTM A815 WPS 32760 refers to wrought super duplex stainless steel pipe fittings manufactured according to ASTM A815 Standards, with the material grade UNS S32760. These fittings are engineered for high-pressure, highly corrosive, and chloride-rich environments, offering exceptional strength, superior corrosion resistance, and excellent resistance to stress corrosion cracking.
UNS S32760 contains 25% Cr, 7% Ni, 3.5% Mo, and added copper & tungsten, providing a balanced microstructure of austenite + ferrite, making it one of the strongest materials for industrial piping applications.
Key Features
Super duplex stainless steel with superior strength
High resistance to pitting, crevice corrosion & chloride stress corrosion cracking
Excellent performance in seawater & marine applications
Twice the strength of conventional stainless steels (304 / 316)
High impact toughness even at sub-zero temperatures
Excellent weldability and fatigue resistance
Long service life in extreme environments
Technical Specification
| Specification | Details |
|---|---|
| Standard | ASTM A815 / A815M |
| Grade | WPS 32760 |
| Material | Super Duplex Stainless Steel |
| UNS | S32760 |
| Manufacturing Class | WPS – Welded, Pickled, Solution Annealed |
| Form | Butt Weld Pipe Fittings |
| Standards | ANSI / ASME B16.9, B16.28, MSS SP-43 / SP-75 |
| Type | Wrought Fittings |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S32760 |
| EN | 1.4501 |
| ASTM | A182 F55 / A276 S32760 |
| DIN | X2CrNiMoCuWN25-7-4 |
| ISO | 25Cr super duplex |
| Common Trade Name | Zeron® 100 |
Available Sizes
NPS: ½” to 24”
Schedules: SCH 10S to SCH 160 / XXS
Forms Available: Seamless / Welded / Fabricated
Chemical Composition
| Element | % |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Tungsten (W) | 0.5 – 1.0 |
| Copper (Cu) | 0.5 – 1.0 |
| Nitrogen (N) | 0.2 – 0.3 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.02 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 750 MPa |
| Yield Strength | ≥ 550 MPa |
| Elongation | ≥ 25% |
| Impact Toughness | Excellent, even at -50°C |
| Hardness | ≤ 310 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Melting Range | ~1450°C |
| Thermal Conductivity | 14.0 W/m-K |
| Modulus of Elasticity | ~200 GPa |
Types of ASTM A815 WPS 32760 Fittings
ASTM A815 WPS 32760 Elbow
ASTM A815 WPS 32760 Tee
ASTM A815 WPS 32760 Reducers
ASTM A815 WPS 32760 Caps
ASTM A815 WPS 32760 Cross Fittings
ASTM A815 WPS 32760 Nipples
ASTM A815 WPS 32760 Couplings
ASTM A815 WPS 32760 Stub Ends
Corrosion Resistance
Seawater corrosion
Chloride stress cracking
Pitting & crevice corrosion (PREN > 40)
Sulfide stress cracking in sour service (NACE MR0175)
Acidic & alkaline chemical exposure
Heat Resistance
Suitable up to 300°C continuous service
Better thermal fatigue resistance than austenitic steel
Retains strength at elevated temperatures
Heat Treatment
| Treatment | Description |
|---|---|
| Solution Annealing | 1020°C – 1120°C |
| Cooling | Rapid water quench |
| Hardening | Not hardenable by heat treatment (work hardened only) |
Welding
Good weldability with proper procedures
Recommended filler metals: ER2594, E2594
Preheat not required; interpass ≤ 150°C
Post-weld solution annealing recommended for critical service
Fabrication
Good machinability with high-speed tools
Avoid excessive cold working without subsequent heat treatment
Bending & forming possible with proper technique
Applications
Offshore oil & gas platforms
Subsea equipment & pipelines
Chemical & petrochemical plants
Desalination & seawater intake systems
Pulp & paper industry
Heat exchangers & pressure vessels
Marine engineering components