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1215 is a re-sulphurized and re-phosphorized free machining steel, commonly referred to as screw machine stock due to cutting speeds and machining characteristics being excellent.
1215 is a re-sulphurized and re-phosphorized free machining steel, commonly referred to as screw machine stock due to cutting speeds and machining characteristics being excellent. Well designed for automatic screw machining where the requirement is exceptional free-machining quality that produces a smooth, bright finish.
The chemical composition of AISI 1215 carbon steel is tabulated below.
| Element | Content (%) |
|---|---|
| Iron, Fe | 98.42 - 98.95 |
| Manganese, Mn | 0.75 - 1.05 |
| Sulfur, S | 0.260 - 0.35 |
| Carbon, C | 0.090 |
| Phosphorous, P | 0.040 - 0.090 |
The following table shows the physical properties of AISI 1215 carbon steel.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.87 g/cm3 | 0.284 lb/in³ |
The mechanical properties of the cold drawn AISI 1215 carbon steel are given in the following table.
| 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) | 80.0 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.) | 140 | 140 |
The thermal properties of AISI 1215 carbon steel are outlined in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@ 20°C/68°F, typical steel) | 11.5 µm/m°C | 6.39 µin/in°F |
| Thermal conductivity (typical steel) | 51.9 W/mK | 360 BTU in/hr.ft².°F |
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