Alloy Information Report for Stainless Steel 422

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).

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

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