ASTM A420 WPL3 — Chemical Composition & Mechanical Properties
ASTM A420 WPL3 is a low-temperature carbon steel (ltcs) grade for wrought butt-weld fittings. It is also known as 3.5 Ni. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group manufactures flanges and fittings in this grade.
ASTM A420 WPL3 at a glance
| Specification | ASTM A420 WPL3 |
|---|---|
| Material family | Low-temperature carbon steel (LTCS) |
| Product form | Wrought butt-weld fittings |
| Also known as | 3.5 Ni |
| Document | TG-MG-101 · Rev. 1 · October 2026 |
Typical service
3.5 % nickel butt-weld fittings for −101 °C service
Heat treatment
Normalised
Chemical composition of ASTM A420 WPL3 (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 450 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 240 MPa |
| Elongation, min | 22 % |
| Charpy V-notch test temperature | −101 °C |
| Hardness | Not specified |
About low-temperature carbon steel (ltcs)
Low-temperature carbon steel (LTCS) is carbon–manganese steel with fine-grain practice and heat treatment chosen to keep its toughness in cold service. Every heat is Charpy impact-tested at the minimum design temperature, which is what separates LTCS from ordinary carbon steel.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
International equivalents of ASTM A420 WPL3
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A420 WPL3 · ASME SA-420 WPL3 |
| Europe — EN designation | 12Ni14 (EN 10216-4) |
| Europe — W.Nr | 1.5637 |
| Japan — JIS | STPL450 (JIS G3460) |
| China — GB / NB | 06Ni3MoDG (GB/T 18984) |
| UK — BS (withdrawn) | BS 3603 503 LT100 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Other low-temperature carbon steel (ltcs) grades
Low-temperature carbon steel (LTCS) overviewStandards for ASTM A420 WPL3
All material standardsFAQ
ASTM A420 WPL3: common questions
What is the minimum yield strength of ASTM A420 WPL3?
240 MPa, with a minimum tensile strength of 450 MPa.
What is the carbon content of ASTM A420 WPL3?
0.20 max %.
How is ASTM A420 WPL3 heat treated?
Normalised.
What is the Chinese (GB) equivalent of ASTM A420 WPL3?
The nearest Chinese equivalent is 06Ni3MoDG (GB/T 18984). Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A420 WPL3?
The nearest Japanese (JIS) equivalent is STPL450 (JIS G3460).
Does Teshi Group supply ASTM A420 WPL3?
Teshi Group manufactures flanges and fittings in this grade. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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