In life, a small screw is commonplace, but it is this small screw that plays a huge role in all walks of life in human life, and its birth makes a qualitative leap in the development of human industry. In the industrial field, people refer to screws and their similar types as "fasteners", and are called "industrial rice". Fasteners are usually manufactured from different metal materials, and titanium alloy fasteners have an irreplaceable role in many fields.
1. High specific strength: Compared with steel materials, the density of titanium alloy is 57% of steel. The extensive use of titanium alloy fasteners can significantly reduce the mechanical quality and reduce energy consumption, which is not only an environmental issue, but also an obvious economic account. The strength and specific strength of titanium alloy are better than that of aluminum alloy, and it is obviously more suitable for some extreme environments, such as space and ocean.
2. Strong corrosion resistance: titanium alloy is not corroded in some corrosive media, such as seawater, wet chlorine, chlorite and hypochlorite solution, nitric acid, chromic acid, metal chloride, sulfide and organic acid. This makes titanium alloy fasteners widely used in marine engineering, chemical refining and other fields.
3. Good heat resistance: usually aluminum at 150 °C, stainless steel at 310 °C that loses its original properties, while titanium alloy still maintains good mechanical properties at about 500 °C. For example, when the speed of the aircraft reaches 2.7 times the speed of sound, the surface temperature of the aircraft structure reaches 230 °C, aluminum alloy and magnesium alloy can no longer be used, and titanium alloy can meet the requirements.
4. Non-magnetic: titanium is a completely non-magnetic metal, so fasteners made of titanium alloy are more suitable for use in various precision machinery to avoid additional magnetic influence on these machinery. In the aerospace industry, the non-magnetic properties of titanium alloy fasteners are very important.
5. Small coefficient of thermal expansion and modulus of elasticity: The coefficient of thermal expansion and modulus of elasticity of titanium alloy materials are smaller than those of nickel alloy and steel materials, and the thermal stress generated by titanium alloy is very small in the same temperature change range, so titanium alloy has high thermal fatigue performance.
6. High appearance: titanium metal can show a variety of colors through surface treatment, so it is also called "colored titanium". This "coloring" skill is a unique property of titanium, and titanium fasteners are no exception, and many people like to use colorful titanium fasteners to highlight their unique characteristics.
