Forging of tungsten, molybdenum and their alloys
1. Forging characteristics of tungsten, molybdenum and their alloys
The melting point of tungsten, molybdenum and their alloys is much higher than that of titanium, and the required forging temperature is very high, all above 1300 ℃. Even at such a high temperature, the deformation resistance is still very high. Therefore, the forging equipment is required to have large capacity and high strength, and the working temperature of the heating equipment is required to be high.
Read More »
Tungsten alloy has better function
In the development of filament materials, rhenium or cobalt can further improve the properties of W-Al alloy. When 3% Re is added, the elongation of WAl2 filament annealed at 2750 ℃ for 3 minutes can reach 25.7%. Even when the RE content is as low as 0.25%, the elongation can reach 6%;
Read More »
Tungsten smelting process
Decomposition method of tungsten concentrate: fire method and wet method.
① sodium carbonate sintering is commonly used for pyrolysis. In this method, wolframite concentrate and sodium carbonate are placed together in a rotary kiln and sintered at 800-900 ℃.
Read More »
Molybdenum: a trace element closely related to life
Molybdenum, like other elements such as copper, iron and zinc, is a trace element closely related to life. Molybdenum exists in human body, animals and plants. So, do you know the relationship between molybdenum and human health, molybdenum and animal health, molybdenum and plant health?
Read More »
Key points and classification of TIG welding
TIG welding (abbreviated as tungsten insert gas welding) has been widely used since Hobart and Devers invented the tungsten inert gas welding in 1920s. As the name suggests, TIG welding is a welding method that uses the arc heat generated between the tungsten electrode and the weldment to melt the weldment and filler wire under the protection of inert gas. Its characteristics are as follows:
Read More »
Key points and classification of TIG welding
TIG welding (abbreviated as tungsten insert gas welding) has been widely used since Hobart and Devers invented the tungsten inert gas welding in 1920s. As the name suggests, TIG welding is a welding method that uses the arc heat generated between the tungsten electrode and the weldment to melt the weldment and filler wire under the protection of inert gas. Its characteristics are as follows:
Read More »
Heat treatment of tungsten and its alloy
Tungsten and its alloy have high hardness and high work hardening speed, so heat treatment must be carried out. For example, for 0.3x200mm thin tungsten plate, the stress shall be eliminated immediately after warm processing, otherwise it may crack by itself, and the cracking is more serious if the processing amount between two annealing is too large (such as 80-90%).
Read More »
The earliest application of micro fertilizer in China's Agriculture: Mo fertilizer the earliest application of micro fertilizer in China's Agriculture: Mo fertilizer
When it comes to molybdenum fertilizer, we always start with such a story. This is a strange thing happened in New Zealand pastures several decades ago (at that time): due to the bad weather, the pastures planted by farmers in the pastures are almost short and small, and even yellow and withered. It looks like a yellow ocean in the past. But there is a small plot of grass that grows well, like a small green island. What's the matter?
Read More »
Beneficiation and smelting process of tungsten
In the periodic table, tungsten and molybdenum have silver gray luster on the surface of VIB group elements, and the powder is dark gray. Their commonness it is characterized by high melting point, strength and modulus of elasticity, small expansion coefficient, low vapor pressure, good conductivity and thermal conductivity, and superior corrosion resistance. Its disadvantages are low temperature embrittlement and high temperature oxidation.
Read More »
Tungsten, molybdenum and their alloys
In the periodic table, tungsten and molybdenum have silver gray luster on the surface of VIB group elements, and the powder is dark gray. Their commonness it is characterized by high melting point, strength and modulus of elasticity, small expansion coefficient, low vapor pressure, good conductivity and thermal conductivity, and superior corrosion resistance. Its disadvantages are low temperature embrittlement and high temperature oxidation.
Read More »
Why don't domestic Aeroengine Blades use tungsten with high temperature resistance? Instead, rhenium without rare performance is used
First of all, it should be understood that the working environment of turbine blade in aeroengine is high temperature (above 1000 ℃), high pressure (above 100MPa), and strong centrifugal force. In addition, the blade should work stably in this environment, and it should not creep or damage. This requires high temperature resistance and creep resistance of the materials used for blades.
Read More »
Export growth of tungsten products slowed down but the structure improved
Influenced by the trade friction between China and the United States, China's export of tungsten products is limited to some extent, while the real consumption demand for tungsten products in the international market is also gradually weakened.
Read More »
Industrial upgrading and gradual improvement of export structure
The technical difficulty of tungsten industry mainly lies in the deep processing. China's cemented carbide is gradually upgrading to high-precision and high-grade products.From the perspective of industrial chain, tungsten ore is processed by coarse crushing, gravity beneficiation and concentration to obtain tungsten concentrate; then ammonium Paratungstate Crystal with high purity and complete crystal varieties can be obtained through alkali pressure boiling, ion exchange, evaporation crystallization and other technologies;
Read More »
Production reduction and price protection: tough tungsten price meets strong support
The dominant production of tungsten resources in China is mainly concentrated in South China.China's tungsten resource reserves are 1.9 million tons, accounting for 57.58% of the world's largest: the world's tungsten resources are mainly concentrated in the Alps Himalayas, the Pacific Rim geological belt and the Mediterranean and Europe's coastal Atlantic region.
Read More »
Production reduction and price protection: tough tungsten price meets strong support
Tungsten industry giant's strong production reduction and constant consumption of inventory in price protection industry
On May 17, 2019, China Tungsten Industry Association, together with ten presidium members, spontaneously held an industry Symposium. The output of tungsten concentrate of the participating enterprises reached 86% of the national annual output. It was decided that this year's combined production reduction of tungsten concentrate should not be less than 10%.
Read More »
Deep analysis of tungsten industry: from the teeth of industry to the backbone of high-end manufacturing
Tungsten: steel gray or silver white, high hardness, strong ductility, melting point up to 3410 ℃, free from air erosion at room temperature, good conductivity and thermal conductivity, usually used as steel, alloy, lighting or chemical production materials.
Read More »
Crystal Chemistry of Tungsten
Scheelite is an intermediate member of the complete homogeneous series of tungsten iron ore (FeWO4)-tungsten manganese ore (MnWO4). Theoretical Composition (ωB/%): tungsten iron FeO 23.65,WO376.35; tungsten manganese MnO 23.42,WO3 76.58.
Read More »
Tungsten ores
Tungsten is a widely distributed element, almost all over the rocks, but the content is low. The ore deposit can be formed as commercial ore mining through the enrichment of relevant geological action.
Read More »
New discovery of gold, silver and tungsten deposits in Wangjiatai, Suixian County, Hubei Province
The Hubei Geological Survey found a new small tungsten deposit in Wangjiatai area of Suixian. Six gold, silver and tungsten polymetallic ore bodies were preliminarily delineated in the mining area. The total WO334 resources verified by engineering are estimated to be 5752 t, which further broadens the prospecting direction of altered rock type and quartz vein type gold, silver and tungsten polymetallic ore in Suibei area.
Read More »
Peanut production key fertilizer, molybdenum fertilizer and boron fertilizer can not be less, when spraying effect is good?
I. Seedling stage, mainly supplemented with molybdenum and boron
Peanut molybdenum and boron need to be sufficient, boron deficiency will appear fruit and no kernel phenomenon, gravure fruit and empty shell fruit increase, grain deformity becomes smaller, less flowering results, empty fruit seedless, boron deficiency is generally difficult to find, once the symptoms have been late.
Read More »
Demand and supply are tightening and molybdenum prices are expected to continue rising
The gap in molybdenum supply is expected to be 1.33,2.16 and 30300 tons in 2019-2021, and molybdenum prices are expected to continue to rise. By combing the production capacity and business plans of the world's major molybdenum producers, we expect a small increase in global molybdenum production, with the annual compound growth rate of about 1% in the next three years, while the global molybdenum consumption growth rate is expected to remain around 4% in the……
Read More »
Global molybdenum consumption
China's crude steel production climbed to 49% in the decade from 2007 to 2017. With China's crude steel production growth and structural optimization, China's molybdenum consumption growth is expected to continue to be higher than the global consumption growth rate.
Read More »
The production of alloy steel is highly correlated with the consumption of molybdenum, which is expected to benefit from the continuous growth of the production of alloy steel
In 2018, the production of alloy steel in the national key Youte steel enterprises was 31.57 million tons, an increase of 11% over the same period last year, and the compound growth rate from 2015 to 2018 was as high as 16.5%. Alloy steel is widely used in construction engineering, machinery manufacturing, automobile, ship, nuclear industry, military weapons and equipment industries.
Read More »
Demand side: downstream recovery, demand growth sustained
Global molybdenum consumption growth is expected to remain around 4% in 2019-2021. According to the International Molybdenum Industry Association (IMOA), the global molybdenum consumption in 2018 was 264400 tons, an increase of about 4.4 percent over the same period last year, and the global molybdenum consumption in 2017 was 253100 tons, an increase of 8.9 percent over the same period last year, and the annual compound growth rate of global molybdenum consumption in the past decade was 2.2 percent.
Read More »
Study on molybdenum depth in nonferrous metals industry report
Molybdenum - Important Adding Element in Steel Industry molybdenum Mo, atomic number 42, with an average content of 0.00011% in the crust, is a silver-white rare metal. Molybdenum is mainly used in iron and steel industry, which can improve the strength, elastic limit, wear resistance and corrosion resistance of steel, accounting for about 80% of the total consumption of molybdenum.
Read More »
Application of molybdenum
Application of molybdenum The application of molybdenum in iron and steel industry occupies the leading position, accounting for about 80% of total consumption of molybdenum, followed by chemical industry, accounting for about 10%.
Read More »
Comparison of properties of tungsten disulfide and molybdenum disulfide
Molybdenum and tungsten are homogeneous chemical elements. Tungsten is heavier than molybdenum and has more stable chemical properties. What about their sulfide properties?
Read More »
"Green" butterfly change of "molybdenum capital of China"
"China's molybdenum capital ", has proven molybdenum reserves first in Asia, scheelite reserves second in the country, molybdenum tungsten mining industry has long been a pillar industry.
Read More »
Troubleshooting of argon arc welding machine
The common causes of failure of TIG arc welding machine and its maintenance methods are as follows:
Read More »
Molybdenum in food
Adults generally need 0.15~0.3 mg of molybdenum per day. due to the relatively widespread presence of molybdenum in food, such as chrysanthemum, wheat, beans, milk.
Read More »
Use of molybdenum
Pure molybdenum wire is used in high temperature electric furnace; molybdenum sheet is used to make radio equipment and X ray equipment; adding molybdenum to alloy steel can improve elastic limit, corrosion resistance and maintain permanent magnetism. Molybdenum is one of the seven micronutrients needed for plant growth and development, without which plants can not survive. Animals and fish, like plants, also need molybdenum.
Read More »
Effects of molybdenum elements
In the late 1950s, something strange happened on a New Zealand ranch. At that time, the scenery was not good, grass withered yellow low, some are dying. But a very lush green pasture belt miraculously grew across the pasture.
Read More »
Tungsten
Tungsten is a widely distributed element, which is almost common in all kinds of rocks but low in content.
Read More »
Application of tungsten alloy as high temperature material
It is not effective to improve the high temperature strength of tungsten simply by solid solution strengthening. However, on the basis of solid solution strengthening, dispersion (or precipitation) strengthening can greatly improve the high temperature strength, ThO2 and precipitation of HfC dispersion particles have the best strengthening effect. Both the w-hf-c and w-tho2 alloys……
Read More »
Current status of tungsten steel
Sintering process The sintering molding of tungsten steel is to press the powder into the blank, then heat it into the sintering furnace to a certain temperature (sintering temperature), and maintain a certain time (holding time), and then cool down, so as to obtain the required properties of tungsten steel material.
Read More »
Tungsten steel
Tungsten steel, also known as cemented carbide, refers to sintered composites containing at least one metal carbide composition. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide and tantalum carbide are common components of tungsten steel.
Read More »
Tungsten alloy
Filament industry tungsten was first used to make incandescent filament. Colegi (W.D.Coolidge) of the United States in 1909 using tungsten powder pressing, remelting, rotary forging, wire drawing process to make tungsten wire, since then tungsten wire production has been rapid development.
Read More »
