Stainless Steel 403

General Characteristics of Stainless 403

This straight chromium stainless steel offers reasonable corrosion resistance and high mechanical characteristics. AISI403 offers heat resistance and a scaling temperature of about 1300°F (704°C).

Chemical Composition of Stainless Steel 403

  • Carbon 0.15 max
  • Manganese 1.00 max
  • Phosphorus 0.040 max
  • Sulfur 0.030 max
  • Silicon 0.50 max
  • Chromium 11.5-13.5
  • Iron balance

Heat Treatment of Stainless 403

  • Anneal by heating to 1350° to 1450°F (732° to 78°C), then air cool
  • To enhance softness, hold at 1450° to 1550°F (788° to 843°C), then furnace cool
  • Annealing reduces machinability
  • Harden by quenching from 1750° to 1850°F (954° to 1010°C) in air or oil, then draw between 800° and 1100°F (427° and 593°C)

Applications of Stainless 403

  • Furnace components
  • Ladles used in molten nonferrous applications
  • Stirring rods

Machinability of Stainless 403

  • 200-240 Brinell hardness or cold-drawn condition recommended
  • Use chip curler cutting tools when turning
  • Grind slight flat on cutting lip face when drilling
  • Highly concentrated sulfur oil
  • Turn: 40-80 sfpm
  • Mill: 35-70
  • Broach: 8-15
  • Ream: 20-60
  • Drill: 30-60

Workability of Stainless 403

  • May be cold worked
  • Easily drop or hammer forged
  • Preheat 2x as long as carbon steel
  • Preheat to 1400° to 1450°F (760° to 788°C), then rapid heat to 2050° to 2150°F (1121° to 1177°C)
  • Reheat once temperature drops to 1450° to 1600°F (788° to 871°C)
  • Bury in dry lime or ash to slow cool

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