ASTM A350 LF2 Cl.1 — Chemical Composition & Mechanical Properties
ASTM A350 LF2 Cl.1 is a low-temperature carbon steel (ltcs) grade for forged flanges & fittings (UNS K03011, EN / W.Nr ≈ P285QH). 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 A350 LF2 Cl.1 at a glance
| Specification | ASTM A350 LF2 Cl.1 |
|---|---|
| Material family | Low-temperature carbon steel (LTCS) |
| Product form | Forged flanges & fittings |
| UNS number | K03011 |
| EN / W.Nr equivalent | ≈ P285QH |
| Also known as | LF2 |
| Document | TG-MG-002 · Rev. 1 · October 2026 |
Typical service
Low-temperature carbon steel service to -46 °C
Heat treatment
Normalized, N&T or Q&T; Charpy V 20 J avg / 16 J min at -46 °C
Chemical composition of ASTM A350 LF2 Cl.1 (weight %)
Other elements and limits: V 0.08 max; Nb 0.02 max
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 485 MPa |
|---|---|
| Yield strength, min | 250 MPa |
| Elongation, min | 22 % |
| Hardness | 197 HBW |
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 A350 LF2 Cl.1
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A350 LF2 Cl.1 · ASME SA-350 LF2 Cl.1 |
| USA — UNS | K03011 |
| Europe — EN designation | P285QH / P355NL1 |
| Europe — W.Nr | 1.0478 / 1.0566 |
| Japan — JIS | SFL2 (JIS G3205) |
| China — GB / NB | 16MnD (NB/T 47009) |
| China — old GB designation | 16MnD |
| UK — BS (withdrawn) | BS 1503-224-490 LT50 |
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 A350 LF2 Cl.1
All material standardsFAQ
ASTM A350 LF2 Cl.1: common questions
What is the minimum yield strength of ASTM A350 LF2 Cl.1?
250 MPa, with a minimum tensile strength of 485 MPa.
What is the carbon content of ASTM A350 LF2 Cl.1?
0.30 max %.
What is the UNS number and EN equivalent of ASTM A350 LF2 Cl.1?
UNS K03011; the nearest European designation is W.Nr ≈ P285QH. Equivalents are close but not identical — check the specification if substituting.
How is ASTM A350 LF2 Cl.1 heat treated?
Normalized, N&T or Q&T; Charpy V 20 J avg / 16 J min at -46 °C.
What is the Chinese (GB) equivalent of ASTM A350 LF2 Cl.1?
The nearest Chinese equivalent is 16MnD (NB/T 47009), formerly 16MnD. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A350 LF2 Cl.1?
The nearest Japanese (JIS) equivalent is SFL2 (JIS G3205).
Does Teshi Group supply ASTM A350 LF2 Cl.1?
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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