303-Se

UNS #S30323

303-Se is a free-machining 18-8 chrome-nickel stainless steel with machinability similar to 303 but with improved formability. Selenium, added to an 18-8 stainless steel that is ordinarily tough and difficult to machine, makes it so freely machinable that it can readily be handled on automatic screw machines at about 75% of the speed of C1212. This steel has displayed nongalling properties that make disassembly of parts easy and help to avoid scratching or galling in moving parts. 303-Se stainless has somewhat better formability than 303 Project 70® and should be considered for applications which involve cold-forming operations.

Type Analysis

  • Carbon (Maximum) 0.12
  • Phosphorus (Maximum) 0.120 - 0.170
  • Silicon (Maximum) 1
  • Nickel (Nominal) 8.00-10.00
  • Manganese (Maximum) 2
  • Chromium (Nominal) 17.00-19.00
  • Iron (Nominal) Balance
  • Selenium (Nominal) 0.15 -0.35

Applications

screw machine products, valves, valve trim

Applicable Specifications

  • AMS 5640
  • AMS 5738
  • MIL-W-52263
  • AMS 5641
  • ASTM A582
  • QQ-S-764

Billet

Hexagons

Rod

Rounds

Wire

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