AISI 1215 is a resulfurized and rephosphorized free-machining carbon steel designed for efficient turning and production of precision-machined components. It is commonly used for fittings, pins, and small machine parts.
AISI 1215 is a free-machining carbon steel developed for manufacturing applications requiring efficient machining, good surface finish, and consistent production quality. Its chemical composition improves machinability, making it suitable for automatic screw machines and CNC turning operations.
The material is commonly used for small precision components, fittings, pins, spacers, and general-purpose turned parts that do not require the higher strength or hardenability of alloy steels. Material selection should consider the intended mechanical loads, surface requirements, and service environment. Welding and applications requiring high toughness should be assessed carefully. Typical Applications: Automatic screw-machine components, fittings, pins, spacers, and precision-turned parts.Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | Symbol | Min (%) | Max (%) | Nominal Target |
|---|---|---|---|---|
| Carbon | C | — | 0.09% | Max 0.09% |
| Manganese | Mn | 0.75% | 1.05% | 0.90% |
| Phosphorus | P | 0.040% | 0.090% | 0.065% |
| Sulfur | S | 0.260% | 0.350% | 0.300% |
| Silicon | Si | — | 0.10% | Max 0.10% |
| Iron | Fe | Balance | Balance | ~98.5% |
| Condition / Thermal State | Tensile Strength (Rm) | Yield Strength (Re) | Elongation (A5) | Hardness (HBW / HRB) |
|---|---|---|---|---|
| As-Rolled / Hot Rolled | 380 – 460 MPa | 230 – 300 MPa | 22% – 30% | 115 – 135 HBW |
| Cold Drawn | 520 – 620 MPa | 410 – 510 MPa | 10% – 15% | 160 – 190 HBW (84 – 91 HRB) |
| Stress Relieved | 450 – 540 MPa | 340 – 430 MPa | 14% – 20% | 140 – 165 HBW |
| Annealed | 360 – 430 MPa | 200 – 260 MPa | 25% – 33% | 105 – 125 HBW |
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