ASTM A420 WPL8
ASTM A420 WPL8 Pipe Fittings
ASTM A420 WPL8 pipe fittings are low-temperature austenitic stainless steel fittings designed for pressure piping and pressure vessel service at subzero and cryogenic temperatures. These fittings are primarily made from Type 304/304L stainless steel, offering excellent corrosion resistance, ductility, and impact strength even at extremely low temperatures.
At Emirerri Steel, we manufacture and export a wide range of ASTM A420 WPL8 Butt Weld Pipe Fittings, including elbows, tees, reducers, caps, and crosses. Each fitting is produced with high dimensional accuracy and quality assurance to meet the stringent demands of industries such as LNG, petrochemical, and cryogenic storage systems.
Key Features
Excellent corrosion and oxidation resistance
Superior toughness at cryogenic and subzero temperatures
Good weldability and formability
Non-magnetic in the annealed condition
Excellent resistance to intergranular corrosion
Available in seamless, welded, and fabricated types
Specification
| Specification | Details |
|---|---|
| Standard | ASTM A420 / ASME SA420 |
| Grade | WPL8 |
| Material Type | Austenitic Stainless Steel (Type 304/304L) |
| Type | Seamless, Welded, Fabricated |
| Form | Elbow, Tee, Reducer, Cap, Stub End, Cross |
| Size Range | ½” NB to 48” NB |
| Dimensions | ASME B16.9, ASME B16.28, MSS-SP-43 |
| Thickness | Sch 10s, Sch 20, Sch 40, Sch 80, Sch 160, XXS |
| Manufacturing Process | Hot Forming / Cold Forming |
| Testing Standard | ASTM A420 / ASME SA420 |
| Application Standard | ASME B31.3, MSS SP-75, ASME B16.9 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A420 WPL8 |
| ASME | SA420 WPL8 |
| EN | 1.4301 / X5CrNi18-10 |
| DIN | X2CrNi18-9 |
| JIS | SUS304L |
| UNS | S30403 |
Available Sizes
Seamless fittings: up to 24” NB
Welded fittings: up to 48” NB
Wall Thickness: SCH 10 to SCH XXS
Custom fittings available on request
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 8.00 – 12.00 |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 485 MPa (min) |
| Yield Strength | 170 MPa (min) |
| Elongation | 35% (min) |
| Hardness (HB) | ≤ 150 HB |
| Impact Strength | Excellent at cryogenic temperatures |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Point | 1400–1450°C |
| Modulus of Elasticity | 193 GPa |
| Thermal Conductivity | 16.2 W/m·K |
| Electrical Resistivity | 0.72 µΩ·m |
| Specific Heat | 500 J/kg·K |
Types of ASTM A420 WPL8 Pipe Fittings
45° & 90° Elbow
180° Return Bend
Equal & Reducing Tee
Concentric & Eccentric Reducer
End Cap
Cross
Stub End
Corrosion Resistance
ASTM A420 WPL8 fittings provide excellent resistance to corrosion in oxidizing and mildly reducing environments. They perform well against organic acids, inorganic chemicals, and atmospheric conditions. The presence of chromium and nickel provides outstanding protection from pitting, crevice, and intergranular corrosion, even after welding.
Heat Resistance
WPL8 stainless steel fittings offer good oxidation resistance up to 870°C in intermittent service and up to 925°C in continuous service. However, for low-temperature or cryogenic operations, they maintain exceptional mechanical properties without embrittlement.
Heat Treatment
Annealing Temperature: 1010–1120°C
Cooling Method: Rapid cooling or water quenching
Purpose: To restore corrosion resistance and eliminate carbide precipitation
No post-weld heat treatment is usually required.
Welding
ASTM A420 WPL8 pipe fittings are readily weldable using standard fusion and resistance methods, both with and without filler metals. Filler materials such as ER308L or ER308 are recommended. Post-weld annealing ensures optimum corrosion resistance.
Fabrication
WPL8 fittings exhibit excellent formability and machinability, allowing for cold and hot forming operations. They can be fabricated into complex shapes while maintaining dimensional accuracy and corrosion resistance.
Applications
LNG and LPG Plants
Cryogenic Storage Systems
Chemical and Petrochemical Industries
Oil & Gas Pipelines
Power Generation Plants
Food Processing and Beverage Industries
Marine and Offshore Installations