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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
Melting Range	1430 to 1480 °C
Specific Heat	0.46 J/g.K

	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