MSS SP 75 WPHY 80
MSS SP 75 WPHY 80 Pipe Fittings
Emirerri Steel is a trusted manufacturer, exporter, and supplier of MSS SP 75 WPHY 80 Pipe Fittings, engineered for the most demanding high-pressure pipeline applications. The WPHY 80 (Wrought Pipe High Yield) fittings offer exceptional mechanical strength, toughness, and reliability under extreme operating conditions.
These fittings are widely used in oil, gas, refinery, petrochemical, and offshore industries where durability, precision, and strength are critical for safe and efficient pipeline performance.
Key Features
High yield strength of 80,000 psi (552 MPa) for superior pressure handling
Excellent toughness and impact strength even at low temperatures
Superior weldability and formability
Resistant to corrosion, erosion, and mechanical stress
Complies with MSS SP 75, ASTM A860, and ASME B16.9 standards
Available in seamless, welded, and fabricated constructions
Ideal for both onshore and offshore pipeline systems
Specification
| Standard | MSS SP 75 / ASME B16.9 / ASME B16.28 |
|---|---|
| Grade | WPHY 80 |
| Material | High Yield Carbon Steel |
| Manufacturing Type | Seamless / Welded / Fabricated |
| Size Range | ½” to 48” (DN15 – DN1200) |
| Pressure Rating | SCH 10S to SCH XXS / STD / XS / 160 |
| Testing | Hydrostatic, NDT, UT, RT, and PMI as per MSS SP 75 |
| Surface Finish | Black Painted, Anti-Rust Oil Coated, Hot-Dip Galvanized |
| Ends | Beveled / Plain / Threaded / Flanged |
| Certification | EN 10204 3.1 / 3.2 |
Equivalent Grade
| Standard | Equivalent Grade |
|---|---|
| ASTM | A860 WPHY 80 |
| ASME | SA860 WPHY 80 |
| API | 5L X80 |
| EN | P500QH |
| DIN | StE 550.7 |
Available Sizes
Seamless Fittings: Up to 24” NB
Welded Fittings: 24” NB to 48” NB
Wall Thickness: SCH 10 to SCH XXS (Custom thickness available)
Chemical Composition
| Element | % Composition (Max/Min) |
|---|---|
| Carbon (C) | 0.26 Max |
| Manganese (Mn) | 1.15–1.60 |
| Phosphorus (P) | 0.035 Max |
| Sulphur (S) | 0.035 Max |
| Silicon (Si) | 0.13–0.37 |
| Vanadium (V) | 0.03–0.08 |
| Niobium (Nb) | 0.02–0.05 |
| Titanium (Ti) | 0.02–0.05 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (Min) | 552 MPa (80,000 psi) |
| Tensile Strength (Min) | 620 MPa (90,000 psi) |
| Elongation | 20% Min |
| Hardness (HB) | 235 Max |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1425–1540°C |
| Thermal Conductivity | 50 W/m·K |
| Modulus of Elasticity | 200 GPa |
| Specific Heat | 486 J/kg·K |
Types of MSS SP 75 WPHY 80 Fittings
Elbows: 45°, 90°, and 180° (Long & Short Radius)
Tees: Equal & Reducing
Reducers: Concentric & Eccentric
Caps and Stub Ends
Cross Fittings
Laterals and Pipe Nipples
Corrosion Resistance
MSS SP 75 WPHY 80 Pipe Fittings exhibit moderate to good corrosion resistance in standard atmospheric and industrial conditions. To enhance service life, fittings are black painted, epoxy coated, or galvanized to resist oxidation, scaling, and corrosion. They are well-suited for pipelines where external protection is essential.
Heat Resistance
These fittings can operate effectively in elevated temperature environments up to 600°F (315°C) without significant loss of mechanical properties. For continuous high-temperature service, post-weld heat treatment (PWHT) is recommended to ensure structural stability and toughness.
Heat Treatment
WPHY 80 fittings are subjected to heat treatment processes such as:
Normalizing – Refines grain structure and enhances ductility
Quenching and Tempering – Improves hardness and mechanical strength
Stress Relieving – Reduces residual stresses post fabrication or welding
All fittings are heat-treated as per MSS SP 75 / ASTM A860 requirements.
Welding
MSS SP 75 WPHY 80 fittings exhibit excellent weldability using conventional welding methods such as MIG, TIG, or SMAW. For optimal results:
Preheat between 150–200°C before welding
Post-Weld Heat Treatment (PWHT) after welding to relieve stress and enhance grain uniformity
Fabrication
These fittings are manufactured using hot or cold forming techniques to ensure precise dimensions and high strength. During fabrication, proper heat treatment restores mechanical integrity. Emirerri Steel ensures stringent dimensional control and surface finishing for each product.
Applications
High-Pressure Oil & Gas Transmission Pipelines
Petrochemical & Refinery Plants
Offshore Drilling Platforms
Power Generation Facilities
Chemical Processing Units
Marine & Shipbuilding Projects
Water and Steam Conveyance Systems