AISI 1144 is a resulfurized carbon steel developed for improved machinability in automatic and precision machining operations. It is commonly used for shafts, pins, studs, and turned machine components.
AISI 1144 is a free-machining resulfurized carbon steel designed for manufacturing operations where efficient machining and consistent component production are important. Its chemical composition promotes improved machinability compared with many conventional carbon steels, making it suitable for high-volume turning and machining applications.
The material is commonly used to manufacture shafts, pins, studs, threaded components, and precision-turned parts. Its mechanical properties depend on the supplied condition and processing history, so the grade should be selected according to the required strength, machinability, and service conditions. Welding suitability should be evaluated before fabrication. Typical Applications: Precision shafts, studs, pins, turned components, and automatic machining 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 | 0.40% | 0.48% | 0.44% |
| Manganese | Mn | 1.35% | 1.65% | 1.50% |
| Sulfur | S | 0.24% | 0.33% | 0.28% |
| Silicon | Si | 0.15% | 0.35% | 0.25% |
| Phosphorus | P | — | 0.040% | Max 0.040% |
| Iron | Fe | Balance | Balance | ~97.2% |
| Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength (Ultimate) | 670 – 760 MPa | 97,000 – 110,000 psi |
| Yield Strength | 570 – 650 MPa | 82,000 – 94,000 psi |
| Elongation at Break (in 50 mm) | 10% – 15% | 10% – 15% |
| Reduction of Area | 30% – 40% | 30% – 40% |
| Hardness (Brinell - HBW) | 201 – 229 HB | 201 – 229 HB |
| Hardness (Rockwell B - HRB) | 93 – 98 HRB | 93 – 98 HRB |
| Modulus of Elasticity (Young's) | 200 GPa | 29,000 ksi |
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
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