Carbon steel A105 vs Low-temp CS A350 LF2
Carbon steel A105 (UNS K03504) vs Low-temp CS A350 LF2 (UNS K03011): chemical composition and mechanical properties side by side.
- Strength: Low-temp CS A350 LF2 minimum yield is 250 MPa vs 250 MPa for Carbon steel A105 (+0%); tensile 485 vs 485 MPa.
- Density: 7.85 vs 7.85 g/cm³ — same weight for the same dimensions.
- Typical use: Carbon steel A105 — Forged flanges and fittings. Low-temp CS A350 LF2 — Charpy tested to −46 °C (Class 1).
| Property | Carbon steel A105 | Low-temp CS A350 LF2 |
|---|---|---|
| Family | Carbon steel | Carbon steel |
| UNS | K03504 | K03011 |
| EN / W.Nr | 1.0460 P250GH | – – |
| Basis spec | ASTM A105 | ASTM A350 |
| Density g/cm³ | 7.85 | 7.85 |
| Chemical composition, % | ||
| C | 0.35 | 0.30 |
| Mn | 0.60–1.05 | 0.60–1.35 |
| P | 0.035 | 0.035 |
| S | 0.040 | 0.040 |
| Si | 0.10–0.35 | 0.15–0.30 |
| Cr | 0.30 | 0.30 |
| Ni | 0.40 | 0.40 |
| Mo | 0.12 | 0.12 |
| Cu | 0.40 | 0.40 |
| V | 0.08 | 0.08 |
| Mechanical properties (min) | ||
| Tensile strength | 485 MPa (70 ksi) | 485 MPa (70 ksi) |
| Yield strength (0.2%) | 250 MPa (36 ksi) | 250 MPa (36 ksi) |
| Elongation | 22% | 22% |
| Hardness (max) | 187 HB | 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 difference between Carbon steel A105 and Low-temp CS A350 LF2?
Strength: Low-temp CS A350 LF2 minimum yield is 250 MPa vs 250 MPa for Carbon steel A105 (+0%); tensile 485 vs 485 MPa. Density: 7.85 vs 7.85 g/cm³ — same weight for the same dimensions. Typical use: Carbon steel A105 — Forged flanges and fittings. Low-temp CS A350 LF2 — Charpy tested to −46 °C (Class 1).
Which is stronger, Carbon steel A105 or Low-temp CS A350 LF2?
Carbon steel A105 has the higher minimum yield strength (250 MPa vs 250 MPa).
Last updated 2026-11-02