MSS SP 75 WPHY 56
MSS SP 75 WPHY 56 Pipe Fittings
MSS SP 75 WPHY 56 Pipe Fittings are high-yield, high-strength carbon steel fittings specifically engineered for high-pressure and high-temperature pipeline systems. The term WPHY stands for Wrought Pipe High Yield, which denotes exceptional mechanical strength, toughness, and durability. These fittings comply with the MSS SP-75 standard, covering wrought steel butt-welding fittings used in oil, gas, and petrochemical transmission pipelines.
At Emirerri Steel, we are a leading manufacturer and exporter of MSS SP 75 WPHY 56 Pipe Fittings that meet stringent international standards. Our fittings offer outstanding performance in demanding environments such as refineries, offshore drilling, and high-pressure transportation systems.
Key Features
High yield strength (minimum 56,000 psi)
Superior impact and mechanical toughness
Excellent corrosion and oxidation resistance
Reliable performance in high-pressure service conditions
Good weldability and formability
Dimensional accuracy with consistent wall thickness
Long service life and structural stability
Specification
| Specification | Details |
|---|---|
| Standard | MSS SP-75 / ASTM A860 / ASME SA860 |
| Grade | WPHY 56 |
| Material | High Strength Low Alloy Carbon Steel |
| Manufacturing Type | Seamless, Welded, Fabricated |
| Size Range | ½” to 48” (DN15 to DN1200) |
| Pressure Rating | SCH 10 to SCH 160, XXS |
| Connection Type | Butt Weld |
| Surface Finish | Black, Anti-Rust Coating, Galvanized |
| Testing | Hydrostatic, Non-Destructive, Tensile, Impact, Hardness |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A860 WPHY 56 |
| ASME | SA860 WPHY 56 |
| API | API 5L X56 |
| ISO | L390 |
Available Sizes
Seamless fittings: up to 24” NB
Welded fittings: up to 48” NB
Wall Thickness: SCH 10 to SCH 160, XXS
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.26 |
| Manganese (Mn) | 1.00 – 1.70 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Silicon (Si) | 0.15 – 0.40 |
| Nickel (Ni) | ≤ 0.50 |
| Chromium (Cr) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.25 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 71,000 psi (min) |
| Yield Strength | 56,000 psi (min) |
| Elongation | 20% (min) |
| Hardness | 197 HB (max) |
| Impact Energy | As per ASTM A370 |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1425 – 1540°C |
| Thermal Conductivity | 52 W/m·K |
| Modulus of Elasticity | 200 GPa |
Types of MSS SP 75 WPHY 56 Pipe Fittings
Elbows (45°, 90°, 180°)
Equal and Reducing Tees
Concentric & Eccentric Reducers
Pipe Caps & Stub Ends
Cross (Equal & Unequal)
Bends & Laterals
Corrosion Resistance
MSS SP 75 WPHY 56 Pipe Fittings exhibit excellent corrosion and oxidation resistance, ensuring long-lasting service life in harsh environments. They are suitable for offshore, onshore, and chemical plant applications where exposure to moisture, acids, or chemicals is common.
Heat Resistance
These fittings maintain superior mechanical properties at elevated temperatures. Their chemical composition allows them to resist deformation and scaling under heat stress, making them suitable for thermal and power generation systems.
Heat Treatment
WPHY 56 fittings are heat-treated through normalizing, quenching, and tempering to enhance yield strength, ductility, and impact toughness. This ensures a refined grain structure and consistent performance under mechanical and thermal stress.
Welding
MSS SP 75 WPHY 56 Pipe Fittings are highly weldable using conventional techniques such as MIG, TIG, and SAW. Preheating before welding and post-weld heat treatment (PWHT) are recommended to avoid residual stress, cracking, and hardness variations in the weld zone.
Fabrication
These fittings are manufactured through hot forming or cold forming processes, ensuring accurate dimensions and smooth finishes. Fabrication is carried out under controlled conditions to maintain uniform mechanical properties and ensure reliable performance in demanding installations.
Applications
Oil and Gas Transmission Pipelines
Petrochemical and Refinery Plants
Power Generation and Energy Sectors
Offshore Drilling Platforms
Chemical Processing and Fertilizer Units
High-Pressure Steam and Hydraulic Systems