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PRODUCT DATA of AISI 409
MaterialAISI 409
General InformationFerritic stainless steel
Chemical Composition10.5-11.75Cr, 0.08C, 1Mn, 0.5Ni, 6xC Ti, rem Fe
EXPERIENCE IN PRACTICE
Equivalent DesignationsUNS S40900, 1.4720, 1.4612
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Magnetic PropertiesFerromagnetic
THERMAL PROPERTIES
Thermal Conductivity24.9 W/m.K
Thermal Expansion Coefficient11.7 μstrain/°C
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 371oC and 593oC 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