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	PRODUCT DATA of AISI 422

Material

AISI 422

Product Datasheet

aisi 422

General Information

Martensitic stainless steel Good greep-rupture properties up to 480 C

Chemical Composition

12Cr, 1Mo,1W, 0.8Ni, 0.25V, 0.23C, rem Fe

	EXPERIENCE IN PRACTICE

Equivalent Designations

Carpenter 636, Unitemp 1420 WM, UNS S42200

	PHYSICAL PROPERTIES

Crystal Structure

Face centered cubic (fcc)

Specific Gravity

7.78

Magnetic Properties

Ferromagnetic

	ELECTRICAL PROPERTIES

Electrical Conductivity

2.79 %IACS

	THERMAL PROPERTIES

Thermal Conductivity

23.8 W/m.K

Thermal Expansion Coefficient

10.8 μstrain/°C

Specific Heat

0.46 J/g.K

Melting Range

1430 to 1480 °C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

No specific corrosion protection required

Corrosion/Thermal

Scaling resistance in air is good up to 700 C.

Atmospheric Corrosion

Has good resistance to general corrosion. Annealing markedly reduce resistance to corrosion. Some surface discouloration may occur

Stress Corrosion Status

Moderate Resistance to SCC: Table 2 Remark:Requires Stress corrosion evaluation form Data Quality: Design Data

Bimetallic Corrosion

Can be connected without any restriction to: Cr, Au, Ag, Gun-metal, P-bronzes, Sn-bronzes, Ti+alloys, Ni, Monel, Inconel, Ni/Mo alloys Can be connected in a non-controlled environment to the above and Cd, austenitic cast iron, Cu, Brasses, Al-bronzes, Si-bronzes, Au, Pt, C, Rh, Sn-Pb alloys, Sn, Pb, 300 series stainless steels Can be connected in a clean room environment to above and Al-Cu alloys Needs specific measures: All others Test:ECSS-Q-ST-70C Rev.1 Table 5.1 Data Quality: Design Data

Machinability

Good in fully annealed state. rating 55

Welding

Requires pre-heat and post-heat treatments