Stainless Steel 422

General Characteristics of Stainless 422

With better strength at higher temperatures, Stainless steel 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).

Chemical Composition of Stainless Steel 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 Steel 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 Steel 422

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

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