General Characteristics of Stainless 422

With better strength at higher temperatures, Stainless 422 is an appealing alternative to Stainless 403. It offers ductility and strength from room temperature to 1200°F (649°C) and resists scaling and oxidation to 1400°F (760°C).

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Chemical Composition of Stainless 422

  • Carbon 0.20-0.25
  • Manganese 1.00 max
  • Molybdenum 0.75-1.25
  • Chromium 12.00-14.00
  • Silicon 1.00 max
  • Sulfur 0.03 max
  • Nickel 0.40-1.00
  • Tungsten 0.75-1.25
  • Vanadium 0.20-0.50
  • Phosphorus 0.04 max
  • Iron balance

Heat Treatment of Stainless 422

  • To anneal, heat to 1600° to 1650°F (871° to 899°C), then slowly cool in furnace
  • For stress relief, heat to 1100° to 1150°F (593° to 621°C) before furnace or air cooling
  • Harden by heating to 1875° to 1925°F (1024° to 1052°C) before oil quenching and tempering

Applications of Stainless 422

  • Aircraft parts
  • Steam and gas turbine components
  • High heat components

Machinability of Stainless 422

  • Comparable to 18-8 but easier to machine
  • Help avoid galling with sharply ground tools
  • Maintain consistent speed and feed
  • Turning tools: 8-14° side rake
  • Drilling: 140° point
  • Threading: grind tools with 10-15° back rake
  • Cobalt high-speed tools: turn at 90-120 sfpm, drill at 40-75 sfpm, mill at 70-120 sfpm, ream at 20-60 sfpm, roughing and finishing at 200-400 sfpm

Workability of Stainless 422

  • Initial forging and rolling at 2100° to 2150°F (1149° to 1177°C)
  • 1700°F (927°C) minimum to hot work