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303Se Stainless Steel | 303 se Round Bar AMS 5738

Shapes Available

  • Round Bar
  • Square Bar


  • Aerospace
  • Manufacturing
  • Oil Refining

Industry Names

  • 303 Se Stainless
  • 303 Se


  • Stainless Steel


  • AMS 5640 Type 1 (303 Bar)
  • UNS S30300
  • UNS S30323


  • Cold Forming
  • Machined Shafts
  • Screw Machine Products
  • Valves for Chemical Handling Equipment


  • Good Corrosion Resistance
  • Great Machinability
  • Improved Formability vs Standard

303Se Stainless Steel is an austenitic steel that contains chromium and nickel. It is also non-hardenable. 303 Stainless Steel with the addition of Selenium improves machinability and allows for less galling. 303 Se is non-magnetic in the annealed condition, however, may show minor magnetic properties after being cold worked.

303 Se Stainless steel comes in round bar and square bar.

Please contact us to request a quote. We specialize in hard to find material.

We work closely with many manufacturers in the aerospace & defense industry. We work with NADCAP approved heat treaters and testing laboratories. We can supply DFARS compliant material.

Metal Properties
Electrical Resistivity 433 Ohms (circ mil./ft.)
Melting Range 2550-2590 °F
Poisson's Ratio 0.3
.2% Yield Strength 34.8 ksi
Density 0.285 lb/inch³
Elongation 50 %
Ultimate Tensile Strength 89.9 ksi
Chemical Composition
C- .15
Cr17.0 19.0
Fe- Bal
Mn- 2.0
Ni8.0 10.5
P- .045
S- .06
Si- 1.0

DISCLAIMER: The information provided on this Web site, technical or otherwise, is merely for informational purposes, and is not intended to serve as a guide, manual, instructions, or any kind reference for proper safety procedures or material purchasing. Michlin Metals makes no warranty, express or implied, based on the statements on this Web site and, as such, will not be liable for any damages, either direct or indirect, including but not limited to consequential damages, such as damages for loss of profits, that may arise based on reliance on the information provided on this Web site. Some information has been referenced from reliable industry sources. Tradenames listed are the sole property of the tradename owners. Michlin Metals typically provides branded products through its relationships with mills and authorized re-sellers. Equivalent non-branded product is sometimes also available through certified sources of such products. Michlin Metals will never substitute non-branded product when branded product is requested.

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