Stainless Steel 303
Stainless Steel 303 is the most machinable austenitic stainless steel grade. The addition of sulfur improves machinability significantly compared to 304, making it the go-to choice for high-volume CNC turned parts.
Machinability
78/100
Tolerance
±0.02 mm
Category
Stainless Steel
Material Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa (90 ksi) |
| Yield Strength | 240 MPa (35 ksi) |
| Hardness | 228 HB |
| Density | 8.03 g/cm³ |
| Machinability Rating | 78/100 |
| Thermal Conductivity | 16.2 W/m·K |
| Melting Point | 1,400–1,420 °C |
| Tolerance | ±0.02 mm |
Common Grades
303303Se
Advantages
- Best machinability among stainless steels
- Good corrosion resistance
- Cost-effective for turned parts
Limitations
- Lower corrosion resistance than 304/316
- Not weldable
- Not suitable for marine environments
Common Applications
Fittings
Nuts and bolts
Shafts
Gears
Aircraft components
Bushings
Industries Served
AerospaceAutomotiveIndustrial MachineryFood Processing
Available Surface Finishes
PassivationElectropolishBead BlastBrushed