A.4.3. Timetal
550 (IMI 550)
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PRODUCT |
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Type |
Metal Alloy |
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Chemical Composition |
4% Al, 4% Mo, 2% Sn, 0.5% Si Rem. Ti |
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Manufacturer |
Timet PO Box
704, Witton Birmingham
B6 7UR UK |
Tel: +44 121 356-1155 Fax: +44 121 356-5413 Email: EuroSales@timet.com www.timet.com |
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EXPERIENCE & AVAILABILITY |
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Development Status |
Commercial Product |
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Cost Range |
Low to Medium |
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Lot Reproducibility |
BS TA45 to TA51, AFNOR TA4DE, Werk. No. 3.7185, CEN Ti
P68 |
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Space Experience |
Good |
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GENERAL PROPERTIES (Physical,
Mechanical, Thermal, Electrical, Optical) |
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Nature |
Typical Value |
Remarks |
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Specific Gravity |
4.60 |
@ Room Temperature |
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Ultimate Tensile Strength |
1062 to 1210 MPa |
@ Room Temperature |
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Proof Stress (0.2%) |
970 to 1109 MPa |
@ Room Temperature |
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Elongation at Break |
12% |
@ Room Temperature |
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Thermal Expansion Coefficient |
8.8 x 10-6 °C -1 |
@ Room Temperature |
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Thermal Conductivity |
8 W m -1 °C -1 |
@ Room Temperature |
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Electrical Resistivity |
1.59 x 10-6 W m |
@ Room Temperature |
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PROPERTIES RELEVANT TO SPACE USE |
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Nature |
Typical Value |
Type of Test |
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Corrosion/Thermal |
Oxidation 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. |
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Stress Corrosion |
High resistance (see note). |
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SPECIAL RECOMMENDATIONS |
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·
Alloy 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. |
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