Stainless Steel Grade 301Si

Topics Covered

Chemical Composition
Mechanical Properties
Other Designations


Grade 301 stainless steel strip is ideal for the manufacture of high strength room temperature springs, and when it is tempered to high strength levels, the steel maintains its ductility whether stress relieving is performed or not.

Stainless steel grade 301Si is a high silicon content steel than grade 301. It is an austenitic steel.

The following datasheet provides an overview of grade 301Si stainless steel.

Chemical Composition

The chemical composition of grade 301Si stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe Balance
Chromium, Cr 16-18
Nickel, Ni 6-8
Manganese, Mn 2
Silicon, Si 1-1.35
Molybdenum, Mo 1
Sulfur, S 0.3
Carbon, C 0.15
Phosphorous, P 0.045
Nitrogen, N 0.02

Mechanical Properties

The mechanical properties of grade 301Si stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 965-1861 MPa 140000-270000 psi
Yield strength 275-1137 MPa 40000-165000 psi
Elongation at break (in 50 mm) 1-25% 1-25%
Modulus of elasticity 193053 MPa 28000000 psi

Other Designations

Equivalent material to grade 301Si stainless steel is ASTM A666.


Grade 301Si stainless steel is widely used for extremely high strength spring applications.

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