303

UNS #S30300

303 is an 18-8 chrome-nickel free-machining stainless steel with the addition of sulfur to enhance the machinability of this ordinarily tough and difficult to machine alloy. 303 steel possesses nongalling properties that make disassembly of parts easy and help to avoid scratching or galling in moving parts. It is not recommended for vessels containing gases or liquids under high pressures.

Type Analysis

  • Carbon (Maximum) 0.12
  • Phosphorus (Maximum) 0.2
  • Silicon (Maximum) 1
  • Nickel (Nominal) 8.00-10.00
  • Manganese (Maximum) 2
  • Sulfur (Maximum) 0.15
  • Chromium (Nominal) 17.00-19.00
  • Iron (Nominal) Balance

Applications

shafts, valve bodies, valves, valve trim, and fittings

Applicable Specifications

  • AMS 5640
  • MIL-S-52263
  • ASTM A581
  • QQ-S-764
  • ASTM A314
  • ASTM A582
  • MIL-S-862

Flats

Hexagons

Rounds

Square

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