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

±0.01 mm

Category

Stainless Steel

Material Properties

PropertyValue
Tensile Strength620 MPa (90 ksi)
Yield Strength240 MPa (35 ksi)
Hardness228 HB
Density8.03 g/cm³
Machinability Rating78/100
Thermal Conductivity16.2 W/m·K
Melting Point1,400–1,420 °C
Tolerance±0.01 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

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