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Material type
Metal
Material name
Stainless steel 303 | 1.4305 | X8CrNiS18-9
Alternative names
X8CrNiS18-9, 1.4305
Process compatibility
CNC machining
Grade 303 is the most readily machineable of all the austenitic grades of stainless steel. It is basically the machining modification os stainless steel 304. This property is due to the higher sulphur presence into the chemical composition. The sulphur presence improves the machinability but slightly lower the corrosion resistance and the toughness compared to the one of stainless steel 304.
Mechanical properties
Ultimate tensile strength
580 - 700 MPa
Yield strength
205 - 350 MPa
Young's modulus
(modulus of elasticity)
(modulus of elasticity)
192 - 200 GPa
Elongation at break
40 - 50 %
Physical properties
Corrosion resistance
Moderate
Magnetism
Non-magnetic
UV resistance
Excellent
Weldability
Very Poor
Thermal properties
Maximum service temperature
750 - 925 °C
Thermal expansion coefficent
16.2 - 17.9 10^-6/ºC
Thermal conductivity
15.8 - 16.5 W/(m⋅°C)
Electrical properties
Electrical resistivity
71.8 - 72.5 μΩ*cm
ESD Safety
Yes
Post treatments
Post-Processing
Not suitable
Anodizing compatibility
Not suitable
Common applications
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