Stainless Steel 303
303 stainless steel, or 1.4305, and X8CrNiS18-9 according to EN and UNS S30300 per UNS, is one of the most widely used grades of stainless steel. It has great machinability compared to other stainless steels which makes it very much like 304 grade with the main difference being sulfur content. Sulfur improves machinability and as a result, 303 is one of the easiest grades for the machine. On the downside, the corrosion resistance is sacrificed. Because of this, 303 stainless steel is more expensive than 304-grade stainless steel.
Specifications for Stainless Steel 303
This table features the aspects of the material associated with its component elements, namely, physical, mechanical, electrical, and thermal properties.
| Property | Metric | English | Comments |
|---|---|---|---|
| Density | 8.00 g/cc | 0.289 lb/in³ | |
| Tensile Strength, Ultimate | 620 MPa | 89900 psi | |
| 140 MPa @ 870 °C | 20300 psi @ 1600 °F | ||
| 205 MPa @ 760 °C | 29700 psi @ 1400 °F | ||
| 310 MPa @ 650 °C | 45000 psi @ 1200 °F | ||
| 380 MPa @ 540 °C | 55100 psi @ 1000 °F | ||
| 420 MPa @ 425 °C | 60900 psi @ 797 °F | ||
| Tensile Strength, Yield | 240 MPa @ Strain 0.2% | 34800 psi @ Strain 0.2% | |
| 70.0 MPa @ 870 °C | 10200 psi @ 1600 °F | ||
| 145 MPa @ 760 °C | 21000 psi @ 1400 °F | ||
| 205 MPa @ 650 °C | 29700 psi @ 1200 °F | ||
| 235 MPa @ 540 °C | 34100 psi @ 1000 °F | ||
| 240 MPa @ 425 °C | 34800 psi @ 797 °F | ||
| Elongation at Break | 50% | 50% | in 50 mm |
| 30% @ 650 °C | 30% @ 1200 °F | in 50 mm | |
| 31% @ 760 °C | 31% @ 1400 °F | in 50 mm | |
| 34% @ 870 °C | 34% @ 1600 °F | in 50 mm | |
| 34% @ 540 °C | 34% @ 1000 °F | in 50 mm | |
| 35% @ 425 °C | 35% @ 797 °F | in 50 mm | |
| Tensile Modulus | 193 GPa | 28000 ksi | |
| Poisson's Ratio | 0.25 | 0.25 | Calculated |
| Fatigue Strength | 240 MPa | 34800 psi | Annealed |
| 330 MPa | 47900 psi | 25% Hardened | |
| Shear Modulus | 77.2 GPa | 11200 ksi | |
| Electrical Resistivity | 0.0000720 ohm-cm | 0.0000720 ohm-cm | |
| Magnetic Permeability | 1.008 | 1.008 | at RT |
| CTE, Linear | 17.2 µm/m-°C @ 0-100 °C | 9.56 µin/in-°F @ 32-212 °F | |
| 17.8 µm/m-°C @ 0-315 °C | 9.89 µin/in-°F @ 32-599 °F | ||
| 18.4 µm/m-°C @ 0-540 °C | 10.2 µin/in-°F @ 32-1000 °F | ||
| 18.7 µm/m-°C @ 0-650 °C | 10.4 µin/in-°F @ 32-1200 °F | ||
| Specific Heat Capacity | 0.500 J/g-°C @ 0-100 °C | 0.120 BTU/lb-°F @ 32-212 °F | |
| Thermal Conductivity | 16.2 W/m-K @ 100 °C | 112 BTU-in/hr-ft²-°F @ 212 °F | |
| 21.5 W/m-K @ 500 °C | 149 BTU-in/hr-ft²-°F @ 932 °F | ||
| Melting Point | 1400 - 1420 °C | 2550 - 2590 °F | |
| Solidus | 1400 °C | 2550 °F | |
| Liquidus | 1420 °C | 2590 °F | |
| Component Elements | |||
| Carbon, C | <= 0.15% | <= 0.15% | |
| Chromium, Cr | 18% | 18% | |
| Iron, Fe | 69% | 69% | |
| Manganese, Mn | <= 2.0% | <= 2.0% | |
| Molybdenum, Mo | <= 0.60% | <= 0.60% | |
| Nickel, Ni | 9.00% | 9.00% | |
| Phosphorus, P | <= 0.20% | <= 0.20% | |
| Silicon, Si | <= 1.0% | <= 1.0% | |
| Sulfur, S | >= 0.15% | >= 0.15% |
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