303 Stainless Steel
Chemical Composition
Carbon:                  0.15% (Max)
Manganese:            2.00% (Max)
Silicon:                   1.00% (Max)
Phosphorous:           0.20% (Max)
Sulfur:                    0.15% (Min)
Chromium:               17.0%-19.0%
Nickel:                     8%-10%
303 stainless steel is typically bought to meet chemistry requirements instead of physical conditions. Therefore, physical properties are generally not provided unless requested before production. Any material can be sent to a third party after production to be tested for physical properties.
Typical Uses
Stainless steel alloy 303 was designed to exhibit improved machinability while maintaining good mechanical and corrosion resistant properties due to the presence of sulfur or selenium in the steel composition. These unique properties allow 303 stainless steel to be used for the following applications:
  • Aircraft Parts
  • Shafts
  • Gears
  • Valves
  • Screw Machine Products
  • Bolts
  • Screws

303 Stainless Steel

303 Stainless Steel is an "18-8" chromium-nickel stainless steel modified by adding selenium or sulfur as well as phosphorus, to improve machinability and non-seizing properties. It is the most readily machinable of all the chromium-nickel stainless grades and has good corrosion resistance, although less than other chromium-nickel grades (304/316). It is non-magnetic in the annealed condition and not hardenable by heat treatment.

303 Stainless Steel Extruded Shape Options

Alro stocks grade 303 stainless steel is available in several shapes to suit your project requirements. 303 stainless steel is not recommended for vessels containing liquids or gases under high pressure.

Contact Alro for Premium 303 Stainless Steel Products Today

Alro’s network of outlet centers spans 60 locations and 12 states, making it easy to find a metals supplier near you. You can also order your metals online with convenient next-day delivery. Request a quote for direct pricing on custom metal fabrication and processing services, or call us at 888-888-2576 to speak with an expert.