24 July 2021 Free-Cutting Steel Bar
AISI 1212 Free Cutting Steel Bar
AISI 1212 is a US standard free-cutting steel, is for good cutting, deliberately increase the S, P and other elements in the steel content, so that the steel becomes brittle, the cutting chip easily broken, good chip removal; the same time due to crisp, Good cutting steel (think about cutting cucumber and cut meat, which is more crisp).
This steel is mainly used to process such as mechanical watches in the shaft of such small parts, to facilitate automatic lathe continuous processing
Chemical Composition:
- Iron, Fe: 98.52 - 99.07
- Sulfur, S: 0.16 - 0.230
- Carbon, C: ≤ 0.13
- Manganese, Mn: 0.70 - 1.0
- Phosphorous, P: 0.070 - 0.12
Mechanical Properties:
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 540 MPa | 78300 psi |
| Yield strength | 415 MPa | 60200 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break | 10% | 10% |
| Reduction of area | 35% | 35% |
| Hardness, Brinell | 167 | 167 |
| Hardness, Knoop (converted from Brinell hardness) | 188 | 188 |
| Hardness, Rockwell B (converted from Brinell hardness) | 85 | 85 |
| Hardness, Vickers (converted from Brinell hardness) | 175 | 175 |
| Machinability (based on 100 machinability for AISI 1212 steel.) | 100 | 100 |