Isotopes are different nuclides of the same element. Their nuclides have the same number of protons but different numbers of neutrons. In nature, naturally occurring isotopes are called natural isotopes, and synthetic isotopes are called artificial isotopes.
Sand casting is a method of obtaining a casting by pouring molten metal into a sand cavity, cooling and solidifying. When the casting is removed from the sand mold, the sand mold is destroyed, so it is also called one-time casting, commonly known as turning sand.
The largest consumption of molybdenum in the steel industry is mainly used to produce alloy steel, stainless steel, tool steel and high-speed steel, cast iron and Roller. Most of the molybdenum is directly used in steelmaking or cast iron after industrial molybdenum briquetting, and a small part is first smelted into ferromolybdenum and then used in steelmaking.
Metal hardness is ability of a metal material to resist local deformation, especially plastic deformation, indentation or scratching. It is an indicator of the hardness of a metal material. It can sensitively reflect the chemical composition, metallographic structure, Differences in heat treatment.
Recently, the research group of Fang Qianfeng, a researcher at the Institute of Solid State Physics, Chinese Academy of Sciences, made significant progress in the development of nanostructured tungsten-based alloys, and successfully prepared high-strength dual-nanostructured tungsten materials.
China is still the world's largest molybdenum producer. China's molybdenum output in the second quarter of 2019 was 230,42 tons, a decrease of 1% from the previous month and a 2% increase from the same period last year.
According to the website of the Ministry of Industry and Information Technology, the Ministry of Industry and Information Technology and the Ministry of Natural Resources jointly issued a notice on the release of the total amount of rare earth and tungsten mining, smelting and separation control indicators.