MSS SP 75 WPHY 70
MSS SP 75 WPHY 70 Pipe Fittings
Emirerri Steel is a leading manufacturer, stockist, and supplier of MSS SP 75 WPHY 70 Pipe Fittings, designed for high-pressure pipeline applications where superior strength and performance are essential. The term WPHY (Wrought Pipe High Yield) refers to fittings that are made from wrought carbon steel with enhanced yield strength.
MSS SP 75 WPHY 70 grade fittings exhibit outstanding tensile strength, toughness, and weldability, making them ideal for oil, gas, petrochemical, refinery, and offshore pipeline systems.
Key Features
High yield strength of 70,000 psi for superior pressure performance
Excellent resistance to impact and stress corrosion
Suitable for high-pressure and high-temperature services
Available in seamless, welded, and fabricated constructions
Conforms to MSS SP 75, ASTM A860, and ASME B16.9 standards
Excellent dimensional accuracy and leak-proof connection
Specification
| Standard | MSS SP 75 / ASME B16.9 / ASME B16.28 |
|---|---|
| Grade | WPHY 70 |
| 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 Test Certificates |
Equivalent Grade
| Standard | Equivalent Grade |
|---|---|
| ASTM | A860 WPHY 70 |
| ASME | SA860 WPHY 70 |
| API | 5L X70 |
| EN | P500QL2 |
| DIN | StE 500.7 |
Available Sizes
Seamless fittings: Up to 24” NB
Welded fittings: 24” NB to 48” NB
Wall Thickness: SCH 10 to SCH XXS and 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) | 483 MPa (70,000 psi) |
| Tensile Strength (Min) | 565 MPa (82,000 psi) |
| Elongation | 21% 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 70 Fittings
Elbows: 45°, 90°, and 180° (Long and Short Radius)
Tees: Equal and Reducing Types
Reducers: Concentric and Eccentric
Caps & Stub Ends
Cross Fittings
Laterals and Nipples
Corrosion Resistance
MSS SP 75 WPHY 70 Pipe Fittings exhibit good corrosion resistance in mild atmospheric and industrial environments. For aggressive conditions, protective coatings such as black paint, epoxy, or galvanization are applied. These coatings enhance the longevity of the fittings by preventing oxidation and rust formation.
Heat Resistance
These fittings can withstand elevated temperatures up to 600°F (315°C) without loss of mechanical strength. However, for long-term high-temperature exposure, post-weld heat treatment is advised to preserve toughness and avoid brittleness.
Heat Treatment
Normalized: Refines the microstructure and improves ductility.
Quenched and Tempered: Enhances mechanical strength and toughness.
Stress Relieving: Reduces residual stress after forming and welding operations.
All fittings are heat-treated in compliance with MSS SP 75 and ASTM A860 requirements.
Welding
MSS SP 75 WPHY 70 fittings possess excellent weldability with all conventional methods like MIG, TIG, and SMAW. Preheating (150–200°C) before welding and Post-Weld Heat Treatment (PWHT) after welding are recommended to ensure weld integrity and minimize internal stresses.
Fabrication
These fittings can be hot-formed or cold-formed and are easily machinable. After fabrication, the fittings undergo required heat treatment to restore strength and grain structure. Emirerri Steel ensures precision manufacturing for leak-proof and high-strength assemblies.
Applications
Oil & Gas Transmission Pipelines
Offshore and Onshore Drilling Platforms
Petrochemical and Refinery Industries
Power Generation Plants
Chemical Processing Industries
High-Pressure Steam & Water Pipelines
Shipbuilding and Marine Engineering