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CNC Machining Service for Stainless steel 303 | 1.4305 | X8CrNiS18-9

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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 stands out as the most machineable among all austenitic stainless steel grades. Essentially, it is a machined variant of stainless steel 304. This enhanced machinability is attributed to the elevated sulphur content in its chemical composition. While sulphur improves machinability, it slightly diminishes corrosion resistance and toughness when compared to stainless steel 304.
Sunnyhowe
Mechanical properties
Ultimate tensile strength
580 - 700 MPa
Yield strength
205 - 350 MPa
Young's modulus (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
75 - 85 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
Drilled or tapped holes
Medical devices with screw threads
Pump and valve parts
Nuts and bolts
Architectural applications

Stainless Steel 303 CNC Machining Applications & Parts

Stainless Steel 303 is the quintessential "free-machining" austenitic stainless steel, modified with sulfur to significantly improve machinability while maintaining good mechanical properties and corrosion resistance. It is ideal for high-volume CNC production.

Typical Parts We Machine from Stainless Steel 303:

  • Automated Machinery: Shafts, gears, nuts, bolts, fittings
  • Food & Beverage Equipment: Valve components, fittings, pump parts
  • Medical & Surgical: Instrument housings, non-implant surgical tool components

Our Machining Advantage:

We leverage the free-machining properties of 303 to achieve high production rates, exceptional surface finishes, and extended tool life, making it a cost-effective choice for complex parts.

Get an Instant Quotefor your custom Stainless Steel 303 parts today.

Tagged: Metal Stainless steel
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