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303 Stainless Steel

303 Stainless Steel is the most readily machineable of all the austenitic grades of stainless steel.

Type 303 is a type of steel used in applications that require parts to be heavily machined while maintaining good mechanical and corrosion resistant properties, demonstrating excellent toughness. Applications include; nuts and bolts, gears, shafts, aircraft fittings etc.

Contact us for the best prices for Type 303.

303 Stainless Steel Bar Grinding Services

  • Austenitic Stainless Steel
  • Excellent machining characteristics
  • Free machining version of Types 302 and 304 is used for parts requiring extensive machining
  • Annealed condition is non-magnetic
  • Type 303 is slightly magnetic when cold worked
  • Good corrosion resistance
  • Good oxidation resistance up to 1700 degrees F


303 stainless steel is covered by the following specifications:

  • AMS 564OG
  • ASTM A314-63
  • ASTM A320-65
  • ASTM 581-67
  • ASTM 582-67
  • QQ-S-764A
  • MIL-S-862B

Composition & Properties


Type 303%


.15 max


2.00 max


.20 max


.15 min




1.00 max


17.00 – 19.00


8.00 – 10.00


.60 max

Typical Mechanical Properties Annealed

Ultimate Tensile Strength, psi


.20% Yield strength psi


Elongation, % in 2″


Reduction of area, %


Standard Heat Treatments

  • Anneal: Heat to 1900 – 2050 F and water quench
  • Harden: Type 303 cannot be hardened by heat treatment


  • Grade 303 Stainless Steel has limited formability because of its sulfur content


  • Excellent machinability

Forging 303 Stainless Steel

  • Type 303 should be heated slowly to 2000-2150 F
  • Soaked for a sufficient time, then raised to 2200 – 3250 F
  • Should not be forged below 1700 F

Corrosion Resistance

  • Excellent corrosion resistance
  • Effectively resist attack in atmospheric exposures, sterilizing solutions, most organic and many inorganic chemicals, most dyes nitric acid and foods
  • For best corrosion resistance finished parts should be free from scale and foreign particles

Welding 303 Stainless Steel

  • Only fair weldability
  • Can be welded using proper procedures
  • Weldability can be improved by using methods that minimize dilution of the weld metal with the melted base metal
  • Reducing the time that welds are in the hot-short temperature range and use of Type 312 (29-9) filler metal helps obtain satisfactory results

We’re a modern, ISO 9001:2015 Certified, fully equiped machine shop dedicated to your success.

If you need a Steel Rod and Bar supplier who will give you quick turnaround times and on-time delivery on quality machined products then you should be talking to us.