Verify deflection limits and evaluate the significant manufacturing time savings of 303 free-machining stainless steel compared to 304/316 alloys.
For actuator shafts requiring extensive machining operations like threading, deep hole drilling, or complex keyways, 303 stainless steel is often the most cost-effective choice.
| Property | Metric Value | Imperial Value |
|---|---|---|
| Yield Strength | ~240 MPa | ~35,000 psi |
| Tensile Strength | ~620 MPa | ~90,000 psi |
| Young's Modulus | 193 GPa | 28,000 ksi |
| Hardness | ~190 HB (Brinell) | ~90 HRB |
| Machinability (vs B1112) | 78% | |
While 303 is much easier to machine, the added sulfur that provides this benefit also lowers its corrosion resistance compared to 304. It's also not suitable for welding. If the shaft needs to be welded to a flange, or if it will be exposed to harsh chemicals, 304 or 316 must be used.
No, like other austenitic stainless steels, 303 cannot be hardened by heat treatment. It can only be hardened through cold working.
One of the secondary benefits of the sulfur inclusions in 303 SS is that it provides a slight anti-galling characteristic, which is highly beneficial for threaded actuator shafts or moving parts compared to 304 SS.
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