All data is for information only------(Home)
	PRODUCT DATA of IMI 550

Material

IMI 550

Product Datasheet

IMI550

General Information

TIMETAL 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 Composition

4% Al, 4% Mo, 2% Sn, 0.5% Si Rem. Ti

Name of Manufacturer

TIMET 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 Status

Commercial Product

Cost Range

Low to Medium

Equivalent Designations

Timetal 550, Ti-550, AFNOR TA4DE, Werk. No. 3.7185, CEN Ti P68

Space Experience

Good

	PHYSICAL PROPERTIES

Specific Gravity

4.6 Remark:@ Room Temperature

Magnetic Properties

Nonmagnetic

	ELASTIC PROPERTIES

Tensile Modulus

110 to 120 GPa Data Quality: Manufacturer's data

	MECHANICAL PROPERTIES

Ultimate Tensile Strength

1000 to 1100 MPa Remark:@ Room Temperature Data Quality: Manufacturer's data

Proof Stress (0.2%)

690 to 920 MPa Remark:@ Room Temperature

Elongation

9 % Data Quality: Manufacturer's data

Reduction in Area

20 to 25 % Data Quality: Manufacturer's data

Fracture Toughness (KIc)

57 to 70 MPa.m^1/2 Data Quality: Manufacturer's data

	ELECTRICAL PROPERTIES

Electrical Volume Resistivity

0.00000159 ohm.m Remark: Data Quality: Manufacturer's data

	THERMAL PROPERTIES

Thermal Conductivity

7.52 W/m.K Remark:@ Room Temperature Data Quality: Manufacturer's data

Thermal Expansion Coefficient

8.8 μstrain/°C Remark: From 20 to 200C Data Quality: Manufacturer's data

Specific Heat

0.634 J/g.K Data Quality: Manufacturer's data

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

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.

Stress Corrosion Status

High Resistance to SCC: Table 1 Data Quality: Design Data

Bimetallic Corrosion

Can 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

Welding

The 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 Recommendations

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.

Lessons Learned

Welding procedures should always be checked. Argon or helium protection is essential on trailing direction and opposite side