Titanium grade 2
Titanium grade 2 is a grade of a high-frequency. It is very soft and heat-resisting metal with a melting point of 1668 °C. It differs with minimal coefficient of thermal expansion, low density (4,505 g/cm3), excellent plasticity (20−80%) that allows stamping various details. Due to presence of oxide surface film, it has a unique corrosive resistance that exceeds a resistance of stainless steels. Titanium sheet that has the same thickness as writing paper dissolves in a sea water over a period of 4000 years.
Titanium gost VT3−1 alloyed with molybdenum (2−3%), aluminium (5.5−7%), zirconium (0.5%) differs with softness, plasticity, corrosive and chemical resistance, high heat-resistance, insignificant coefficient of thermal expansion. Fatigue resistance essentially depends on outdoor environment. Titanium alloys demonstrate higher enduring quality than in air environment in vacuum.
Percentage composition of titanium grade 2 according to GOST 19807 — 91
|≤0,25||≤0,07||≤0,1||≤0,04||99.3 — 99.7||≤ 0,2||≤0,01||≤ 0,3|
Heat-resistance, corrosive resistance, softness, high plasticity of this metal make it an ideal material for manufacturing tubes, die cast and pressed parts in aircraft and rocket engineering (45−48%). It is also used in chemical industry, shipbuilding, energetics (up to 20%). A consumption expansion of this metal is the most demonstrative in aviation.
Surface condition and quality exert a great influence on damping enduring quality of titanium semi-fabricates. By surface quality, there are meant its roughness, macro- or micromechanical irregularity; by surface condition, there are meant its texture, physical-mechanical properties of skins, which depend on schedule of mechanical treatment. Gentle finishing mechanical treatment with metal removing (up to 0.1 mm) and further hand polishing to 8−9 grade of roughness with a help of copper coated abrasives exert the lowest influence on fatigue range. The worst fatigue resistance can be observed after abrasive grinding and forced cutting.
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