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PRODUCT DATA of AISI 422
MaterialAISI 422
Product Datasheetaisi 422
General InformationMartensitic stainless steel Good greep-rupture properties up to 480 C
Chemical Composition12Cr, 1Mo,1W, 0.8Ni, 0.25V, 0.23C, rem Fe
EXPERIENCE IN PRACTICE
Equivalent DesignationsCarpenter 636, Unitemp 1420 WM, UNS S42200
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Specific Gravity7.78
Magnetic PropertiesFerromagnetic
ELECTRICAL PROPERTIES
Electrical Conductivity2.79 %IACS
THERMAL PROPERTIES
Thermal Conductivity23.8 W/m.K
Thermal Expansion Coefficient10.8 μstrain/°C
Melting Range1430 to 1480 °C
Specific Heat0.46 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusNo specific corrosion protection required
Corrosion/ThermalScaling resistance in air is good up to 700 C.
Atmospheric CorrosionHas good resistance to general corrosion. Annealing markedly reduce resistance to corrosion. Some surface discouloration may occur
Stress Corrosion StatusModerate Resistance to SCC: Table 2
Remark:Requires Stress corrosion evaluation form
Data Quality: Design Data
Bimetallic CorrosionCan 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
MachinabilityGood in fully annealed state. rating 55
WeldingRequires pre-heat and post-heat treatments