Carbon Steel A105 / A350 LF2 Round Bars
ASTM A105 is the most widely specified carbon steel forging grade for pressure piping components in ambient and elevated temperature service, such as flanges, fittings and valve parts. ASTM A350 LF2 is a closely related carbon-manganese steel that is normalized, or quenched and tempered, and Charpy V-notch impact tested, which makes it suitable for low temperature service down to -46 °C (-50 °F). Both grades combine good strength, machinability and weldability at an economical cost.
Nexforge Alloys manufactures and supplies A105 and A350 LF2 round bars and forged bar stock in the normalized condition (A105N), with LF2 available in Class 1 and Class 2, as per ASTM A105 and ASTM A350 respectively. Bars are supplied with mill test certificates and can be cut, chamfered or rough machined to your requirement.
ASTM A105 / A105N (K03504) and ASTM A350 LF2 Class 1 / Class 2 (K03011) round bars from 20 mm to 500 mm diameter, normalized and impact tested.
A105 / A350 LF2 Round Bar Specification
| Parameter | Details |
|---|---|
| Grades | ASTM A105 / A105N (UNS K03504), ASTM A350 LF2 Class 1 and Class 2 (UNS K03011) |
| Standards | ASTM A105 / ASME SA105, ASTM A350 / ASME SA350 |
| Size Range | 20 mm to 500 mm diameter |
| Length | Random 3 to 6 metres, or cut to length |
| Condition | A105: as forged / normalized (A105N); A350 LF2: normalized, normalized and tempered, or quenched and tempered |
| Surface Finish | Hot rolled / forged black, peeled, rough turned |
| Tolerance | h11 or as per drawing |
| Testing | Chemical, tensile, hardness, Charpy V-notch impact (LF2), UT on request |
| Certification | EN 10204 3.1 mill test certificate |
Chemical Composition (% by weight)
| Grade (UNS) | C | Mn | Si | P | S | Cu | Ni | Cr | Mo | V | Nb |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A105 (K03504) | 0.35 max | 0.60 - 1.05 | 0.10 - 0.35 | 0.035 max | 0.040 max | 0.40 max | 0.40 max | 0.30 max | 0.12 max | 0.08 max | - |
| A350 LF2 (K03011) | 0.30 max | 0.60 - 1.35 | 0.15 - 0.30 | 0.035 max | 0.040 max | 0.40 max | 0.40 max | 0.30 max | 0.12 max | 0.08 max | 0.02 max |
For both grades the sum of Cu, Ni, Cr, Mo and V shall not exceed 1.00 %, and the sum of Cr and Mo shall not exceed 0.32 %.
Mechanical Properties
| Grade | Tensile Strength | Yield Strength (min) | Elongation (min) | Reduction of Area (min) | Hardness (max) | Charpy V-Notch (min avg.) | Density |
|---|---|---|---|---|---|---|---|
| A105 | 485 MPa (70 ksi) min | 250 MPa (36 ksi) | 22 % | 30 % | 187 HBW | Not required | 7.85 g/cm³ |
| A350 LF2 Class 1 | 485 - 655 MPa (70 - 95 ksi) | 250 MPa (36 ksi) | 22 % | 30 % | 197 HBW | 20 J at -46 °C | 7.85 g/cm³ |
| A350 LF2 Class 2 | 485 - 655 MPa (70 - 95 ksi) | 250 MPa (36 ksi) | 22 % | 30 % | 197 HBW | 27 J at -18 °C | 7.85 g/cm³ |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- Normalized A105N and LF2 bars with a uniform, fine grained structure
- A350 LF2 is Charpy impact tested for low temperature service down to -46 °C
- Good machinability and weldability for flanges, fittings and valve components
- Economical choice for pressure parts in non-corrosive service
Applications
- Forged and machined flanges, fittings and couplings
- Valve bodies, bonnets, stems and other pressure containing parts
- Oil and gas, refinery and petrochemical piping components
- Low temperature piping, LPG and gas processing plants (LF2)
- Shafts, studs, bushes and general engineering components