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PRODUCT DATA of AISI 321
MaterialAISI 321
Product DatasheetAK steel 321_Data_Sheet
Aubert Duval 321_X18PA
General InformationTitanium stabilized for service in 425 to 870C range and to minimize carbide precipitation when welding for resistance to intergranular corrosion
Effects of Space environmentThe natural oxide layer is not repaired in vacuum when damaged. Cold welding might occur in contact to similar materials
Chemical Composition17-19Cr, 9-12Ni, <2Mn, <0.08C, (5xC) Ti min, rem Fe
Name of ManufacturerAubert and Duval
22, rue Henri-Vuillemin • 92230 Gennevilliers - France
33 (0)1 55 02 58 00
33 (0)1 55 03 58 01
dircom@aubertduval.com
www.aubertduval.com
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Cost RangeLow
Lot ReproducibilityGood
Equivalent DesignationsUNS S30403, Z 2 CN 18-10, FE-PA11, FE-PA3901, X1CrNi18-10, X2CrNi19-11, X18BC
Space ExperienceGood
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Specific Gravity8
Magnetic PropertiesNonmagnetic
ELASTIC PROPERTIES
Tensile Modulus193 GPa
Shear Modulus78 GPa
Poisson Ratio0.27
ELECTRICAL PROPERTIES
Electrical Volume Resistivity2.83e-7 ohm.m
Electrical Conductivity2.41 %IACS
THERMAL PROPERTIES
Thermal Conductivity15.6 W/m.K
Thermal Expansion Coefficient16.6 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: acc. to ECSS-Q-ST-70-36C
Data Quality: Design Data
EMF vs SCE-0.08 V
Remark: Measured in 3.5% NaCl solution. Passive condition
Data Quality: Design Data
Bimetallic CorrosionCan be connected without any restriction to: Cr, Au, Pt, C, Rh, Ag, Gun-metal, P-bronzes, Sn-bronzes, Ti+alloys
Can be connected in a non-controlled environment to the above and Cd, Cu, Brasses, Ni, monel, inconel, N-Mo alloys, 400 series stainless steel
Can be connected in a clean room environment to above and Al-Cu alloys, Cu-Ni alloys, Al-bronzes, Si-bronzes
Needs specific measures: All others
Test:ECSS-Q-ST-70C Rev.1 Table 5.1
Data Quality: Design Data
FLUID SYSTEMS COMPATIBILITY
Gaseous Oxygen (GOX)Meets the mechanical impact requirements. No batch test required.
Liquid Oxygen (LOX)Meets the mechanical impact requirements. No batch test required.
Nitrogen Tetroxide (N2O4)SCC susceptibility is low and no fluid decomposition
Hydrazine (HDZE)SCC susceptibility is low and no fluid decomposition