What is 303 Stainless Steel (UNS S30300)?

Grade 303 stainless steel is the most readily machinable of all austenitic steel. 303 has lower corrosion resistance than 304 with excellent toughness.

The following datasheet gives an overview of Type 303.


Chemical Composition


ElementContent(%)
Chromium (Cr)17 – 19
Nickel (Ni)8 – 10
Manganese (Mn)2
Silicon (Si)1
Phosphorus (P)0.4
Sulfur (S)0.15
Carbon (C)0.1
Iron (Fe)Balance


Physical Properties


PropertiesMetricImperial
Density8.03 kg/cm³lb./in³


Mechanical Properties


PropertiesMetricImperial
Tensile Strength500 – 750 MPapsi
Yield StrengthMPapsi
Elastic Modulus193 GPapsi
Poisson’s Ratio
Elongation at Break
Hardness, Brinell230


Thermal Properties


PropertiesMetricImperial
Thermal Expansionµm/m°-Cµin/in°F
Thermal ConductivityW/mKBTU in/hr.ft².°F


Fabrication and Heat Treatment


Machinability


303 steel has excellent machinability. Enhance by:

  • Keep cutting edges sharp.
  • Cuts should be light but deep.
  • Use chip breakers.
  • Use coolants and lubricants in large quantities.


Welding

Grade 303 stainless steel has poor weldability. Use filler rods or electrodes of grades 308L and 309. Anneal welds for maximum corrosion resistance.


Heat Treatment

Type 303 cannot be hardened by heat treatment. Use solution treatment or anneal by rapid cooling after heating to 1010-1120°C.


Hot Working

Uniformly heat to 1149-1260°C before forging. Rapidly cool to ensure maximum corrosion resistance.


Cold Working

Type 303 is difficult to cold work. We do not recommend sharp bends. 


Applications


Grade 303 stainless steel is used when parts must be heavily machined:


  • Nuts and bolts
  • Screws
  • Gears
  • Aircraft fittings
  • Bushings
  • Shafts

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