Stainless steel type 1.4305 is popularly known as grade 303 stainless steel. Grade 303 is the most readily machinable of all the austenitic grades of stainless steel. The machinable nature of grade 303 is due to the presence of Sulphur in the steel composition. Whilst the Sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness. The corrosion resistance of type 303 is lower than that for 304. The toughness is still excellent as with other austenitic grades. It is reasonable to expect specifications in this data sheet to be similar but not necessarily identical to those given in this data sheet.
Application
Shafts
Springs
Nuts & bolts
Gears
Aircraft fittings
Bushings
Alloy Designations
Stainless steel grade 1.4305/303 also corresponds to: UNS S30300, BS 303S31 and EN 58M.
Chemical Compositions
| Element | % Present |
Carbon (C) | 0.10 |
Chromium (Cr) | 17.00 - 19.00 |
Manganese (Mn) | 2.00 |
Silicon (Si) | 1.00 |
Phosphorous (P) | 0.045 |
Sulphur (S) | 0.015 - 0.35 |
Nickel (Ni) | 8.00 - 10.00 |
Nitrogen (N) | 0.10 |
Copper (Cu) | 1.00 |
Iron (Fe) | Balance |
Mechanical properties
| Property | Value |
Comprehensive Strength | 190 MPa |
Tensile Strength | 500 - 700 MPa |
Elongation | 35 Min% |
Physical Properties
| Property | Value |
Density | 8.03 Kg/m3 |
Melting Point | 1455 °C |
Thermal Expansion | 17.2 x 10-6 /K |
Modulus of Elasticity | 193 GPa |
Thermal Conductivity | 16.3W/m.K |
Electrical Resistivity | 0.072 x 10-6 Ω .m |
