ASTM A420 WPL6
ASTM A420 WPL6 Pipe Fittings
Emirerri Steel is a leading manufacturer and exporter of ASTM A420 WPL6 Pipe Fittings, designed specifically for low-temperature pressure piping applications. The WPL6 (Wrought Pipe Low-Temperature) grade fittings are manufactured from high-quality carbon steel, ensuring exceptional toughness, strength, and durability in subzero operating conditions.
These fittings are widely used in oil & gas, petrochemical, power generation, and cryogenic industries where reliability under extreme cold temperatures is essential.
Key Features
Excellent impact toughness at subzero temperatures
High mechanical strength and durability
Superior weldability and machinability
Designed for low-temperature service (-46°C and below)
Conforms to ASTM A420 / ASME SA420 standards
Available in seamless, welded, and fabricated types
Long service life and cost-effective performance
Specification
| Standard | ASTM A420 / ASME SA420 / ASME B16.9 / B16.28 |
|---|---|
| Grade | WPL6 |
| Material | Carbon Steel |
| Manufacturing Type | Seamless / Welded / Fabricated |
| Size Range | ½” to 48” (DN15 – DN1200) |
| Pressure Rating | SCH 10 to SCH XXS / STD / XS / 160 |
| Testing | Hydrostatic, Impact Test, NDT, UT, RT, PMI |
| Surface Finish | Black Painted, Anti-Rust Oil Coated, Galvanized |
| Ends | Beveled / Plain / Threaded / Flanged |
| Certification | EN 10204 3.1 / 3.2 Test Certificates |
ASTM A420 WPL6 Equivalent Grade
| Standard | Equivalent Grade |
|---|---|
| ASTM | A420 WPL6 |
| ASME | SA420 WPL6 |
| DIN | St 35.8 / 1.0305 |
| EN | P355NL1 |
| BS | 3602 Gr. 355 |
| JIS | G3454 STPG370 |
Available Sizes
Seamless Fittings: Up to 24” NB
Welded Fittings: 24” NB to 48” NB
Thickness: SCH 10 to SCH XXS (custom wall thickness available)
ASTM A420 WPL6 Chemical Composition
| Element | % Composition (Max/Min) |
|---|---|
| Carbon (C) | 0.30 Max |
| Manganese (Mn) | 0.29 – 1.06 |
| Phosphorus (P) | 0.035 Max |
| Sulphur (S) | 0.040 Max |
| Silicon (Si) | 0.13 – 0.37 |
| Nickel (Ni) | 0.40 Max |
| Chromium (Cr) | 0.30 Max |
| Molybdenum (Mo) | 0.12 Max |
| Copper (Cu) | 0.40 Max |
| Iron (Fe) | Balance |
ASTM A420 WPL6 Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (Min) | 240 MPa (35,000 psi) |
| Tensile Strength (Min) | 415 MPa (60,000 psi) |
| Elongation | 22% Min |
| Impact Test Temperature | -46°C |
| Hardness (HB) | 197 Max |
ASTM A420 WPL6 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 A420 WPL6 Pipe Fittings
Elbows: 45°, 90°, and 180° (Long & Short Radius)
Tees: Equal & Reducing
Reducers: Concentric & Eccentric
Caps & Stub Ends
Cross Fittings
Laterals & Nipple Fittings
Corrosion Resistance
ASTM A420 WPL6 Pipe Fittings exhibit moderate corrosion resistance in water, steam, and atmospheric environments. When used in corrosive or moist conditions, external surfaces are often painted, epoxy coated, or galvanized for enhanced protection. These fittings perform effectively when paired with proper insulation in cryogenic and low-temperature systems.
Heat Resistance
WPL6 fittings maintain excellent strength and impact resistance in low to moderate temperatures, up to approximately 450°C (840°F). However, they are specifically optimized for low-temperature performance, ensuring no embrittlement or cracking at subzero temperatures.
Heat Treatment
Normalized: Enhances ductility and refines grain structure
Quenched and Tempered: Improves toughness and strength
Stress Relieved: Removes internal stresses post forming or welding
All fittings are heat-treated as per ASTM A420 / ASME SA420 requirements to ensure consistent mechanical performance.
Welding
ASTM A420 WPL6 Pipe Fittings possess excellent weldability with all conventional methods including MIG, TIG, and SMAW. Preheating (100–150°C) is recommended before welding, and post-weld heat treatment (PWHT) may be applied depending on the service condition and thickness.
Fabrication
These fittings are fabricated using hot forming or cold forming techniques, followed by necessary heat treatment to restore mechanical properties. Emirerri Steel ensures precision machining and dimensional accuracy for a perfect fit in pipeline assemblies.
Applications
Cryogenic and Low-Temperature Services
Oil & Gas Processing and Transmission Lines
Petrochemical and Refinery Plants
Power Generation & LNG Terminals
Pressure Vessel Piping Systems
Chemical and Fertilizer Industries
Water Treatment and Desalination Plants