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PRODUCT DATA of IMI 550
MaterialIMI 550
Product DatasheetIMI550
General InformationTIMETAL 550 is a medium strength, forgeable alpha beta alloy. In the solution treated and aged condition, the alloy has superior tensile and fatigue properties compared to TIMETAL 6-4 combined with good elevated temperature tensile strength and creep properties up to 750°F (400°C). TIMETAL 550 has applications in the aerospace industry, both as aeroengine and airframe components. Typical applications include compressor discs and flap tracks. The alloy has also found applications in high performance automotive engines.
Chemical Composition4% Al, 4% Mo, 2% Sn, 0.5% Si Rem. Ti
Name of ManufacturerTIMET
The Hub,Holford Road, Witton, Birmingham B6 7AX, UK

+44 121 356-1155 EuroSales@timet.com
+44 121 356-5413
www.timet.com
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Cost RangeLow to Medium
Equivalent DesignationsTimetal 550, Ti-550, AFNOR TA4DE, Werk. No. 3.7185, CEN Ti P68
Space ExperienceGood
PHYSICAL PROPERTIES
Specific Gravity4.6
Remark:@ Room Temperature
Magnetic PropertiesNonmagnetic
ELASTIC PROPERTIES
Tensile Modulus110 to 120 GPa
Data Quality: Manufacturer's data
ELECTRICAL PROPERTIES
Electrical Volume Resistivity0.00000159 ohm.m
Remark:
Data Quality: Manufacturer's data
THERMAL PROPERTIES
Thermal Conductivity7.52 W/m.K
Remark:@ Room Temperature
Data Quality: Manufacturer's data
Thermal Expansion Coefficient8.8 μstrain/°C
Remark: From 20 to 200C
Data Quality: Manufacturer's data
Specific Heat0.634 J/g.K
Data Quality: Manufacturer's data
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Corrosion/ThermalOxidation resistant with retention of useful strength and creep resistance up to 500°C. Strong affinity for H2 (above 130°C), N2 (above 800°C) and O2 (above 700°C), which cause embrittlement.
Stress Corrosion StatusHigh Resistance to SCC: Table 1
Data Quality: Design Data
Bimetallic CorrosionCan be connected without any restriction to: Cr, Cu, Brass, Cu-Ni alloys, Al-bronzes, Si-bronzes, Gun metal, P-bronzes, Sn-bronzes, Ag, 300 and 400 series stainless steel, low alloy steel, Au, Pt, C, Rh
Can be connected in a non-controlled environment to the above and Ni, Monel, Inconel, Ni-Mo alloys
Can be connected in a clean room environment to above and Cd, Al-Cu alloys
Needs specific measures: All others
Test:ECSS-Q-ST-70C Rev.1 Table 5.1
Data Quality: Design Data
WeldingThe alloy may be welded using controlled electron beam or laser welding techniques. Slow welding speeds and low cooling rates are necessary to achieve adequate weld properties.
SPECIAL RECOMMENDATIONS
Special RecommendationsAlloy possesses poor notch sensitivity characteristics, so considerable care should be taken to avoid the presence of stress raisers. · Methyl alcohol should not be used in the pressure testing of tanks since failure can occur due to stress-corrosion cracking.
Lessons LearnedWelding procedures should always be checked. Argon or helium protection is essential on trailing direction and opposite side