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ASTM A420 WPL8 Pipe Fittings
ASTM A420 WPL8 Pipe Fittings Manufacturer and Supplier in India
ASTM A420 WPL8 pipe fittings are 9% nickel low-alloy steel fittings for low-temperature and deep cryogenic pressure piping and pressure vessels. WPL8 is the lowest grade in the ASTM A420 system, the coldest rating of -320°F [-195°C] and is not stainless steel. The nickel content prevents the D-BT which is normally present in carbon steel at cryogenic temperatures and makes it brittle, while the cost is much lower than austenitic stainless steel for this application. Solitaire Overseas manufactures and supplies ASTM A420 WPL8 Pipe Fittings in India in various sizes and shapes as per requirement of the project with dimensional control and documentation of materials.
Technical Data
Specifications of ASTM A420 WPL8 Pipe Fittings
| Specification | Details |
|---|---|
| Standard | ASTM A420 / ASME SA420 |
| Grade | WPL8 |
| Material Type | Low-Temperature 9% Nickel Alloy Steel (see note below) |
| 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 / Schedule | 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 |
Chemical Compositions of ASTM A420 WPL8 Pipe Fittings
| Specification | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Nickel (Ni) |
|---|---|---|---|---|---|---|
| ASTM A420 WPL8 | 0.13 max | 0.90 max* | 0.030 max | 0.030 max | 0.13–0.37 | 8.40–9.60 |
ASTM A420 WPL8 Pipe Fittings Physical Properties
| Density | Melting Point | Modulus of Elasticity | Thermal Conductivity | Electrical Resistivity | Specific Heat |
|---|---|---|---|---|---|
| 7.9 g/cm³ | 1400–1450°C | 193 GPa | 16.2 W/m·K | 0.72 µΩ·m | 500 J/kg·K |
Mechanical Properties of ASTM A420 WPL8 Pipe Fittings
| Specification | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (min) | Impact Test Temp. | Charpy V-Notch Impact Energy (Avg min) | Hardness (Max) |
|---|---|---|---|---|---|---|
| ASTM A420 WPL8 | 100–125 ksi (690–865 MPa) | 75 ksi min (515 MPa min) | 16% (longitudinal) | −320°F (−195°C) | 25 ft·lbf (33.9 J) | ≤ 250 HBW |
Equivalent Grades of ASTM A420 WPL8 Pipe Fittings
| Standard Specification | ASTM | ASME | UNS | EN / DIN (Material Class Equivalent)* |
|---|---|---|---|---|
| ASTM A420 WPL8 | A420 WPL8 | SA420 WPL8 | K81340 | X8Ni9 / 1.5662 (EN 10028-4) |
Different Types of ASTM A420 WPL8 Pipe Fittings
- 45° & 90° Elbow
- 180° Return Bend
- Equal & Reducing Tee
- Concentric & Eccentric Reducer
- End Cap
- Cross
- Stub End
Applications and Industrial Uses of ASTM A420 WPL8 Pipe Fittings
- LNG Processing Industry
- Petrochemical Industry
- Oil & Gas Industry
- Chemical Processing Industry
- Cryogenic Storage Industry
- Industrial Gas Industry
- Refining Industry
- Marine and Shipbuilding Industry
Frequently Asked Questions
ASTM A420 WPL8 Pipe Fittings are 9% nickel low-alloy steel fittings designed for low-temperature and cryogenic pressure service.
ASTM A420 is a specification for wrought carbon and alloy steel pipe fittings used in low-temperature service.
No. ASTM A420 WPL8 is a 9% nickel low-alloy steel grade, not an austenitic stainless steel grade.
Yes. WPL8 is designed for very low-temperature service down to approximately −195°C (−320°F).
The specified Charpy impact test temperature is −195°C (−320°F).
Nickel improves toughness and ductility at very low temperatures, making the grade suitable for cryogenic service.
They can be supplied in seamless or welded construction, depending on the product and applicable manufacturing requirements.
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