Stainless Steel 303

Grade Summary: A Chromium-nickel stainless steel with added sulfur or selenium and phosphorus to improve machinability and non-seizing properties. It is the most free machining of the chromium-nickel grades. Non-magnetic in the annealed condition

Typical Applications: Aircraft parts and parts requiring machining, grinding or polishing with good corrosion resistance. Excellent for moving parts and where low magnetic permeability is required.

Available products: Round Bar, Rectangular Bar, Square Bar and Hexagonal Bar

Typical Chemical Analysis:

303 (Sulfur):

  1. *C – .15 *Mn – 2.00 Max *P.15 Max *S.15 Max *Si – 1.00 Max
  2. *Cr – 17.00/19.00*Ni – 8.00/10.00 *Cu – .75 Max *Mo – .75 Max

303 (Selenium ):

  1. *C – .15 Max *Mn – 2.00 Max *P.17 Max *S.04 Max *Se – .15/.40
  2. *Si – 1.00 Max *Cr – 17.00/19.00 *Ni – 8.00/10.00 *Cu – .75 Max *Mo – .75 Max

Typical Mechanical Properties** :

Tensile Strength (PSI) 90,000
Yield Point (PSI) 35,000
Elongation*** 50

* Chemical Analysis will vary on each heat number

** All values are averaged and are representative.

*** (% in 2”).

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