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PRODUCT DATA of AISI 420
MaterialAISI 420
Product Datasheet 420_Data_Sheet
General InformationMartensitic stainless steel
PrecautionsThis type should not be used for heavily stressed parts that operate at subzero temperatures.
Chemical CompositionFe-13Cr-0.15C
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Equivalent Designations1.4021; X20Cr13 420 S37; Z20C13; 2303, 20X13, 2Cr13
Space ExperienceGood
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Specific Gravity7.75
Magnetic PropertiesFerromagnetic
ELECTRICAL PROPERTIES
Electrical Conductivity3.15 %IACS
THERMAL PROPERTIES
Thermal Conductivity21.5 W/m.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusNo specific corrosion protection required
Stress Corrosion StatusModerate Resistance to SCC: Table 2
Remark:Tempering between 371oC and 593oC shall be avoided because corrosion and stress corrosion cracking resistance is lowered. Requires Stress corrosion evaluation form
Data Quality: Design Data
EMF vs SCE-0.17 V
Remark: Measured in 3.5% NaCl solution. Passive condition
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