What are the hardest metal alloys?

1. Titanium alloy
Titanium is an important structural metal developed in the 1950s. Titanium alloys are widely used in various fields because of their high strength, good corrosion resistance, and high heat resistance. Many countries in the world have recognized the importance of titanium tungsten alloy materials, have successively conducted research and development on them, and have obtained practical applications. In the 1950s and 1960s, they mainly developed high-temperature titanium alloys for aerospace engines and structural titanium for airframes. Alloys, a batch of corrosion-resistant titanium alloys were developed in the 1970s. Since the 1980s, corrosion-resistant titanium alloys and high-strength titanium alloys have been further developed. Titanium alloys are mainly used to make aircraft engine compressor carbide parts, followed by structural parts for fire, missiles and high-speed aircraft.

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2. 440c stainless steel
440C stainless steel is a martensitic stainless steel. The carbon content is 1.0% and the chromium content is 16-18%. Strong rust resistance, high quality stainless steel
440C has the highest hardness among all stainless carbide steels and heat-resistant steels. Used for nozzles and bearings, 440F: is a steel grade that improves the easy cutting performance of 440C steel. Used for automatic lathes. Martensitic stainless steel has the same characteristics of hardening through quenching as ordinary alloy steel, so a wide range of different mechanical properties can be obtained by selecting the grade and heat treatment conditions.

3. Hard aluminum alloy
Heat treatment can strengthen aluminum alloys, including aluminum-copper-magnesium series and aluminum-copper-manganese series alloys. This type of alloy has good strength and heat resistance, but its corrosion resistance is not as good as pure aluminum and rust-proof aluminum alloys. Aluminum cladding is commonly used to improve the corrosion resistance of duralumin products in the ocean and humid atmosphere.