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Basic characteristics:
TB2 is a high-strength, high toughness, and metastable beta titanium alloy independently developed and produced in China. The alpha stable element is 3% Al, with a Mo equivalent of 18.15. This alloy has excellent cold forming performance and good welding performance in the solution treated state, and has high strength and good plasticity matching in the solution aged state. The main drawbacks of this alloy are high density, low elastic modulus, and low resistance to high-temperature creep.
TB2 (GB/T 3620.1-2007) chemical composition:
chemical compostion TB2 Fe C Cr Mo N V - - 7.5 4.7 - 4.7 0.3 0.05 8.5 5.7 0.04 5.7 Al H Y O Single Others Ti 2.5 - - - - - Remainder 3.5 0.015 0.005 0.15 0.1 0.4 The chemical composition includes chemical components with unspecified values in the table. Analysis should only be conducted if it is assumed to exist or in routine analysis, and there are indications that its composition will exceed the specified value.
Physical property:
Thermal conductivity temperature θ/°C 100 200 300 400 500 600 Thermal conductivity
λ/[W/(m.°C)]Solid solution treatment 8.9 10.9 12.6 14.7 16.3 16.8 Solid solution aging 8.2 10.8 11.9 13.1 14.7 16.3 Specific heat capacity temperature θ/°C 100 200 300 400 500 600 Specific heat capacity
c/[J/(kg.°C)]Solid solution treatment 536 553 565 628 607 858 Solid solution aging 523 540 557 574 590 607 Linear expansion coefficient temperature θ/°C 20~100 20~200 20~300 20~400 20~500 20~600 Linear expansion coefficient
α/10-6°C-1Solid solution treatment 8.5 9.3 9.5 9.7 9.8 10 Solid solution aging 8.7 9.1 9.4 9.7 9.8 10.8 resistivity temperature θ/°C 20 100 200 300 400 500 resistivity
ρ/(μΩ.m)Solid solution treatment 1.55 1.51 1.5 1.49 1.48 1.47 Solid solution aging 1.36 1.36 1.41 1.44 1.47 1.5 Application area:
TB2 alloy is used to produce various head types of rivets, but bolts, screws, or nuts have not yet been produced. High strength is required, with a tensile strength of about 900MPa, as well as good deformation performance, excellent oxidation resistance, corrosion resistance, and weight reduction. For use below 200 ° C, it is recommended to choose.
Product form:
The main semi-finished products of TB2 alloy include sheet, strip, foil, bar, wire, etc. Sheet metal can be made into sheet metal parts, pressure vessels, and solid rocket engine shells. The strip can be made into a star arrow connecting strip. Foil can be made into corrugated shells and honeycomb structures. Silk can be cold riveted to produce various head type rivets, and can be both cold and hot riveted. The rivets can be directly used after being riveted in a solution treated state. Bars can be cold forged to produce various head bolts, which can be used in solution treated or solution aged conditions.
This alloy is suitable for manufacturing aerospace fasteners that operate below 300 ℃, as well as aerospace fasteners that operate for a short period of time below 500 ℃.
