Low-temp carbon steel LF2 (UNS K03011)
Low-temp carbon steel LF2 (UNS K03011) — Impact-tested carbon steel for service down to about -46 °C.
| UNS number | K03011 |
| Material family | Carbon steel |
| Product specifications | ASTM A350 LF2 (forgings), A420 WPL6 (fittings), A333 Gr 6 (pipe) |
| Density (typical) | 7.85 g/cm³ (7850 kg/m³) |
| Weight of 6" Sch 40 pipe | 28.26 kg/m |
Specifications by product form
One alloy is ordered under different ASTM/ASME numbers depending on form: forged flanges and fittings, wrought buttweld fittings, and pipe or tube. For Low-temp carbon steel LF2 the usual specifications are ASTM A350 LF2 (forgings), A420 WPL6 (fittings), A333 Gr 6 (pipe). Quote both the specification and the UNS number on purchase orders to avoid ambiguity.
Chemical and mechanical limits differ between these specifications — always check the edition of the standard named on your order and the mill test certificate.
Chemical composition & mechanical properties
| Property | Low-temp CS A350 LF2 |
|---|---|
| Family | Carbon steel |
| UNS | K03011 |
| EN / W.Nr | – – |
| Basis spec | ASTM A350 |
| Density g/cm³ | 7.85 |
| Chemical composition, % | |
| C | 0.30 |
| Mn | 0.60–1.35 |
| P | 0.035 |
| S | 0.040 |
| Si | 0.15–0.30 |
| Cr | 0.30 |
| Ni | 0.40 |
| Mo | 0.12 |
| Cu | 0.40 |
| V | 0.08 |
| Mechanical properties (min) | |
| Tensile strength | 485 MPa (70 ksi) |
| Yield strength (0.2%) | 250 MPa (36 ksi) |
| Elongation | 22% |
| Hardness (max) | 197 HB |
| PREN (min, from spec) | – |
Single values are maximums; ranges are min–max; "bal" = balance. Limits are typical of the basis specification for that product form — forgings, pipe and fittings specifications differ slightly. Always check the exact specification, edition and the mill test certificate.
Frequently asked questions
What is the UNS number of Low-temp carbon steel LF2?
K03011.
Which ASTM specifications cover Low-temp carbon steel LF2?
ASTM A350 LF2 (forgings), A420 WPL6 (fittings), A333 Gr 6 (pipe).
What is the density of Low-temp carbon steel LF2?
About 7.85 g/cm³ (7850 kg/m³), used for weight calculations.
Last updated 2026-11-02