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PRODUCT DATA of AISI 348
MaterialAISI 348
General InformationSimilar to AISI 347,but with a maximum Ta concentration of 0.1%. This grade was designed for nuclear applications to avoid long-life isotopes produced by irradiation of Tantalum
Effects of Space environmentThe natural oxide layer is not repaired in vacuum when damaged. Cold welding might occur in contact to similar materials.
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Cost RangeLow
Lot ReproducibilityGood
Equivalent DesignationsS30348
Space ExperienceGood
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Specific Gravity7.96
Magnetic PropertiesNonmagnetic
ELASTIC PROPERTIES
Tensile Modulus193 GPa
Poisson Ratio0.3
ELECTRICAL PROPERTIES
Electrical Volume Resistivity7.2e-7 ohm.m
Electrical Conductivity2.4 %IACS
THERMAL PROPERTIES
Thermal Conductivity16.3 W/m.K
Thermal Expansion Coefficient16.6 μstrain/°C
Melting Range1400 to 1450 °C
Specific Heat0.5 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: acc. to ECSS-Q-ST-70-36C
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