422 stainless steel

422 stainless steel forgings are critical for high-stress, high-temperature environments, offering a unique combination of martensitic strength, thermal stability, and corrosion resistance. Their compliance with aerospace and industrial standards ensures reliability in turbines, power plants, and oil/gas equipment.

Descriptions

1. Chemical Composition

The composition of 422 stainless steel includes chromium, molybdenum, and tungsten to enhance high-temperature strength and oxidation resistance:

Element	Composition (%)
Carbon (C)	0.20-0.25
Manganese (Mn)	≤1.00
Silicon (Si)	≤0.75
Phosphorus (P)	≤0.025
Sulfur (S)	≤0.025
Chromium (Cr)	11.00-13.00
Nickel (Ni)	0.50-1.00
Molybdenum (Mo)	0.75-1.25
Tungsten (W)	0.75-1.25
Vanadium (V)	0.20-0.30
Iron (Fe)	Balance

2. Mechanical Properties

422 stainless steel forgings achieve optimal performance after heat treatment (quenching and tempering). Properties vary between annealed and heat-treated conditions:

Annealed Condition

Property	Value
Tensile Strength	690 MPa (100,000 psi)
Yield Strength(0.2% offset)	515 MPa (75,000 psi)
Elongation (50 mm gauge)	18%
Hardness (Brinell)	212-248HB
Modulus ofElasticity	200 GPa(29 x10⁶psi)
Density	7.76 g/cm³(0.280 1b/in³)
Melting Range	1425-1510°C(2597-2750°F)

Heat-Treated Condition (Quenched & Tempered)

Property	Value
Tensile Strength	1035-1240 MPa (150,000-180,000psi)
Yield Strength (0.2% offset)	860-1035 MPa (125,000-150,000 psi)
Elongation (50 mm gauge)	12-15%
Hardness (Rockwell C)	28-35 HRC

3. Common Forging Product

Forged Turbine Blades

Forged Compressor Disks

Forged Valve Bodies

Forged Shafts

Forged Fasteners

4. Key Advantages

High-Temperature Stability: Retains strength and resists creep at temperatures up to 650°C.

Oxidation Resistance: Forms a protective chromium oxide layer.

Machinability: Can be machined in the annealed condition and hardened post-processing.

5. Industry standards

Standard	Scope
ASTM A565/A565M	Martensitic stainless steel bars for high-temperature service.
AMS 5619	Aerospace-grade 422 stainless steel bars and forgings.
ASTM A473	Stainless steel forgings (general applications).
ASME SA565	ASME Boiler and Pressure Vessel Code compliance.
EN 10088-3	Technical delivery conditions for semi-finished products.