On the 25th, China's first-generation demonstration project of "Hualong-1" with complete independent intellectual property rights - Fuqing NPP Unit 5 construction project once again achieved a new breakthrough: Following the cylinder body of No.5 Unit Reactor on August 16 After the steel lining "module one" is hoisted in place, the steel liner "module two" of the cylinder smoothly lifts in place on October 25.
According to Xinhua News Agency reported Oct. 26, the Fuqing Nuclear Power Unit 5 "Module II" hoisting completed time than the relevant schedule 21 days ahead of schedule, marking the progress of Unit 5 good progress and site construction management steadily improved.
According to Fuqing NPP technical staff, Unit 5 reactor plant this "module two" diameter of 46.8 meters, 7.55 meters high, weighing about 81.6 tons, together with lifting truss, walkway board, supporting pieces and other ancillary items, lifting the total The weight is about 170.4 tons, the construction difficulty is not small.
After the "Module 2" is successfully hoisted, the construction height of the steel lining of the cylinder will reach the standard level to meet the requirements of continuous construction of the containment continuous construction of "Hualong I", and effectively reduce the interaction between the steel lining construction and the concrete construction Cross effect.
May 7 this year, China's third generation nuclear power technology "Hualong One" demonstration project - Nuclear Group Fuqing 5 nuclear power unit officially started construction. The construction of this project will make our country a third country with independent third generation nuclear power technology after the United States, France and Russia and will also become a milestone of our country's formal entry into the world advanced nuclear power technology nation camp.
Basic use: About 50% of the tungsten ore mined in the world is used for the smelting of high-quality steel, about 35% is used for the production of hard steel, about 10% is used for making tungsten wire, and about 5% is used for other purposes. Tungsten can be used to manufacture firearms, rocket propeller nozzles, armor-piercing bullets, metal-cutting blades, drills, superhard dies, wire drawing dies, etc. Tungsten is widely used in mining, metallurgy, machinery, construction, transportation, electronics, chemical industry, Light industry, textile, military industry, aerospace, science and technology, various industrial fields.
Tungsten is widely used in modern technology in pure metal state and alloy system state. The most important alloy system state is alloy steel, tungsten carbide-based cemented carbide, wear-resistant alloy and strong heat alloy. Tungsten is mainly used in the following industrial fields:
Steel industry: Tungsten is mostly used in the production of special steel. The widely used high speed steel contains 9%-24% tungsten, 3.8%-4.6% chromium, 1%-5% vanadium, 4%-7% cobalt, 0.7%-1.5% carbon. The characteristic of high-speed steel is that it can be automatically quenched at a high tempering temperature (700-800℃) in the air, so it maintains high hardness and wear resistance until 600-650℃. Tungsten steel in alloy tool steel contains 0.8%-1.2% tungsten; chromium-tungsten silicon steel contains 2%-2.7% tungsten; chromium-tungsten steel contains 2%-9% tungsten; chromium-tungsten-manganese steel contains 0.5%- 1.6% tungsten. Tungsten-containing steel is used to manufacture various tools: such as drills, milling cutters, wire drawing dies, female and male dies, air tools and other parts. Tungsten magnet steel is a permanent magnet steel containing 5.2%-6.2% tungsten, 0.68%-0.78% carbon, and 0.3%-0.5% chromium. Tungsten-cobalt magnets contain 11.5%-14.5% tungsten, 5.5%-6.5% molybdenum, and 11.5%-12.5% cobalt hard magnetic materials. They have high magnetization and coercivity.
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