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PRODUCT DATA of AISI 444
MaterialAISI 444
Product Datasheet444_Data_Sheet
General InformationFerritic stainless steel
Chemical Composition17.5-19.5Cr, 1.75-2.5Mo, 1Ni,0.03C, 0.44min Ti+Nb, rem Fe
EXPERIENCE IN PRACTICE
Equivalent DesignationsASTM A176 , SAE 51444
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Specific Gravity7.8
Magnetic PropertiesFerromagnetic
ELECTRICAL PROPERTIES
Electrical Volume Resistivity6.2e-7 ohm.m
THERMAL PROPERTIES
Thermal Conductivity26.8 W/m.K @ 100C
Thermal Expansion Coefficient10 μstrain/°C
Remark: from 0 to 100C
Specific Heat0.42 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusNo specific corrosion protection required
Stress Corrosion StatusHigh Resistance to SCC: Table 1
Remark: Tempering between 371C and 593C shall be avoided because corrosion and stress corrosion cracking resistance is lowered.
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