Stainless Steel 303
Material Data Sheet
The machineable nature of Grade 303 stainless steel is due to the presence of Sulphur in the steels composition. Whilst the Sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness. The corrosion resistance of grade 303 stainless steel is lower than that for 304. The toughness is still excellent as with other austenitic grades.
| Element | Content(%) |
|---|---|
| Iron, Fe | 69.00 |
| Chromium, Cr | 18.00 |
| Nickel, Ni | 9.00 |
| Manganese, Mn | ≤2.00 |
| Silicon, Si | ≤1.00 |
| Carbon, C | ≤0.15 |
| Phosphorus, P | ≤0.20 |
| Sulfur, S | ≤0.35 |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.89 g/cc | 0.290 lb/in3 |
| Melting Point | 1400 – 1420 °C | 2550 – 2590 °F |
| Properties | Metric | Imperial |
|---|---|---|
| Hardness, Brinell | 228 | 228 |
| Hardness, Knoop | 251 | 251 |
| Hardness, Rockwell B | 96 | 96 |
| Hardness, Rockwell C | 19 | 19 |
| Hardness, Vickers | 240 | 240 |
| Tensile Strength, Ultimate | 690 MPa | 100000 psi |
| Tensile Strength, Yield | 415 MPa | 60200 psi |
| Elongation at Break | 40% | 40% |
| Modulus of Elasticity | 193 GPa | 28000 ksi |
| Poisson’s Ratio | 0.25 | 0.25 |
| Fatigue Strength | 240 MPa | 34800 psi |
| Shear Modulus | 77.2 GPa | 11200 ksi |
| Properties | Metric | Imperial |
|---|---|---|
| CTE, linear 20°C | 17.2 µm/m-°C | 9.56 µin/in-°F |
| Specific Heat Capacity | 0.5 J/g-°C | 0.12 BTU/lb-°F |
| Thermal Conductivity | 16.2 W/m-K | 112 BTU-in/hr-ft²-°F |
Stainless Steel 303 is used in the following application areas:
- Aircraft applications including fittings, shafts and spindles
- Automatic screw machine applications
- Medical devices with screw threads, drilled or tapped holes
- Pump and valve parts
- Architectural applications
- Nuts and bolts
Key Words: T303, T 303, 303SS, 303 SS, AFNOR Z 10 CNF 18.09 (Fr), UNI X 10 CrNiS 18 09, SUS 303, SS14 2346 (Sweden), B.S. 303 S 21, UNS S30300, AMS 5640 (1), ASME SA194, ASME SA320, ASTM A194, ASTM A314, ASTM A320, ASTM A320, ASTM A473, ASTM A581, ASTM A582, MIL SPEC MIL-S-862, SAE J405 (30303), DIN 1.4305, X12CrNiS188, EN 58M, austenitic, ISO 683/13 17, 18-8
