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(%)
| Carbon |
max |
0.20-0.25 |
Manganese |
max |
1.00 |
| Phosphorus |
max |
0.04 |
Sulfur |
max |
0.03 |
| Silicon |
max |
1.00 |
Chromium |
|
12.00-14.00 |
| Nickel |
|
0.40-1.00 |
Vanadium |
|
0.20-0.50 |
| Iron |
|
Balance |
Molybdenum |
|
0.75-1.25 |
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
