Rhenium is a rare element, which was discovered late. 1872, Russian Mendeleev predicted that there was a "manganese-like" element with atomic weight of 190 in nature. 1925, German chemist Noddack discovered this element in Nb-Mn-Fe ore through spectroscopy, and named it rhenium after Rhein. Later, Noddack discovered that rhenium mainly existed in molybdenite and extracted rhenium from it. Rhenium resources are scarce and expensive, and it has been studied less for a long time. After 1950, rhenium began to be used in modern technology, and its production developed day by day. In 1960s, China began to extract rhenium from molybdenum concentrate roasting dust.

Rhenium can improve the strength and plasticity of tungsten, molybdenum and chromium at the same time, which is called "rhenium effect". Add rhein

Adding a small amount of rhenium (3% ~ 5%) can increase the recrystallization starting temperature of tungsten by 300℃ ~ 500℃-the above effect of rhenium (re) is called rhenium effect. W-Re and Mo-Re alloys have good high-temperature strength and plasticity, and can be processed into plates, sheets, wires and rods, which are used for high-temperature structural parts (nozzles and nozzles) in aerospace.