Stainless Steel 303 1.4305

Stainless Steel 303 1.4305

Stainless Steel 303 1.4305 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...
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Stainless Steel 303 1.4305

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

PropertyValue

Comprehensive Strength

190 MPa

Tensile Strength

500 - 700 MPa

Elongation

35 Min%


Physical Properties

PropertyValue

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


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