Stainless steel raw materials: molybdenum application

Molybdenum application in the chemical industry more striking, especially the rapid development of molybdenum compounds in chemical engineering Stainless Steel Cold Heading Wire. In recent years, despite the downturn in the state of molybdenum, molybdenum compounds but the application is still in the growing, and toward a multi-polar direction. Molybdenum and molybdenum alloy with a high degree of stability in a number of the reaction medium, it is in the chemical industry, oil refining and glass light is widely used in anti-corrosion materials, such as lining chemical equipment, spare parts, valves, steam pipes, heat exchangers , reboilers and the like. Currently, molybdenum and molybdenum alloys have been used for making, such as acids, bases, salts, molten glass, and some components of equipment working in a gaseous medium. Hot concentrated sulfuric acid system as large valves, heat exchangers Stainless Steel Spring Wire   . Allegedly achieve chlorination reaction at 320 ℃ and high pressure conditions the device may also be molybdenum and molybdenum alloys. The main application of molybdenum compounds in the following areas: catalysts and activators, lubricants and lubricant additives, pigments, dyes, paints and inks, water quality and medium ring corrosion agent, composite ion exchanger, batteries, flame retardants, Smoke getter agents, trace additives, molybdenum compound fertilizer, superconducting materials, ceramic materials, polymers, fillers, energy storage materials, gasoline additives, glass materials. It was predicted that the next 10 years, the development of new applications of molybdenum may be mainly reflected in the fine chemical industry, is likely to make a breakthrough molybdenum consumption increases.

Stainless steel raw materials: molybdenum development

The main areas of consumption of molybdenum in the steel industry, the industrialized countries more than 80% of molybdenum as an added element of steel, only about 20% of the molybdenum metal used to produce molybdenum, super alloys and special alloys, chemicals, etc., consumed in oil chemical industry, light industry, electronics and some high-tech areas.Molybdenum and molybdenum alloy rods (bars), wire, sheet, strip, foil and shaped products commonly used in metallurgy, machinery manufacturing,stainless steel wire electronics, lighting and some high-tech fields. Stainless Steel Shaped Wire The illumination filament stent mandrel wire, reflective screen; electronics industry with an anode, a gate and an auxiliary electrode, gasket; vacuum plating, sputtering with the container, a boat, a heater; heat generating element used in a high temperature furnace electrodes, heat shields; surface treatment used for welding, spraying; thermocouple and temperature with protective cover; UO2 refining was burned by boat and so on. The last 10 years, the application of molybdenum was given a further expansion, such as molybdenum powder or molybdenum wire thermal spraying greatly improves the life of the piston rings and gear parts on the car; in glass and fire-resistant fiber material industry, molybdenum can be replaced previous platinum crucibles and electrodes, and achieved great results. The emergence of high-temperature molybdenum, mercury and molybdenum in a vacuum oven halogen range of applications is growing.Stainless steel wires In die-casting industry, molybdenum and alloys can be used as non-ferrous and ferrous metal casting mold material. Molybdenum-based ceramic heat pipe suitable for BOF steelmaking process of continuous measurement of the casing, hot extrusion die; molybdenum alloys are widely used to wear head seamless steel and stainless steel pipe system, significantly improve productivity and product quality, reduce costs. Molybdenum and tungsten alloy formation, its anti (liquid zinc and zinc vapor) particularly excellent corrosion resistance, has generally produced using Mo-30W alloy casing vertical and temperature, greatly reducing maintenance downtime, improve working conditions. MoSi2 oxidation resistance particularly good, use it as a working temperature up to 1700 ℃ heating elements in the atmosphere, but also as a rare earth smelting and some single crystal pulling crucible, instead of precious platinum crucible.

Concerning imports of stainless steel that need attention

Stainless steel material used YHC two points and domestic imports, domestic materials, the use of the European (ISO) system, using ingredients that the more intuitive, is not prone to the problem, and now we focus on the number of issues that need attention imports of stainless steel :
1, the material standards

      Now, we often see the United States imports of stainless steel standard ASME standard SA240, ASTM A240 standards and Japanese JIS standard SUS; grades often used for 304,304L, 316L and so on. 304 The following example to illustrate their representation: JIS standard materials, said the relatively simple, is SUS304 say so; ASME and ASTM, said there are several: SA240-304, SA240TP304, A240-304, A240TP304, in fact, the middle - and plus TP meaning is the same. We have previously mentioned materials 304L, where L is the suffix, indicating a lower carbon content; there can often be seen H, indicates a higher carbon content, mainly used in high temperature applications; also another common There are N, the additional element N, to increase the strength. Sometimes, we can also be seen in the back: 2B, No.1 and other suffixes, these suffix indicates that the surface state of the material; 2B represents hot rolling plus cold rolling, surface better, to mirror the requirements of steel; 2D representation plus cold rolling the hot rolled, the surface of the stainless steel welding wire sheet generally; No.1 represents hot rolling surface.
2, on the alternative materials

      In the eyes of many people, materials, "high-generation low-to-generation thin-thick" is the right and proper thing, no more tubes, in fact, this view is wrong, here we 304,304L, 304H example to explain : General view, 304L than 304 have lower carbon content, better corrosion resistance, so you can replace the 304 material. 304L 304 does meet the requirements, and more than 304, seems to automatically replace 304, but the mechanical properties, the strength is higher than 304 304L, when the press 304 is designed with 304L alternative, will result in insufficient strength; In addition, In China Pressure Vessel GB150-1998 in Article 4.1.6: When the temperature is higher than the use of austenitic Stainless steel weaving wire 525 ℃, the carbon content of the steel should be not less than 0.04%. Therefore, that can replace 304 304L using the wrong point of view, and can not be used with the use of the occasion, but also to capacity in accordance with regulatory requirements, we have no right to "material substitution", only the original design department can only be entitled to a "material substitution "work.

Classification of antibacterial stainless steel

Antibacterial stainless steel produced by antimicrobial resistance is divided into two types: type and their antimicrobial coating type. The former can be modified existing stainless steel products, i.e., on a 304 Stainless Steel Binding Wire plated with a metal material with a germicidal, bactericidal effect, or other inorganic material, but the drawback is easy to wear, easy to aging, temperature changes and with the external environment and change, so that the loss of antibacterial stainless steel; the latter is added in the stainless steel production process some of the metallic elements having antimicrobial activity, through special processing to make antibacterial Electro Polishing Quality (Epq) Wire itself, it does not have the disadvantages of the former, and low cost, easy to processing.99.9% kill rate of E. coli, Staphylococcus aureus killing rate of 99.5%, 99.0% kill rate of Candida albicans, Kuhei bacteria kill rate of 86.6%. Common sense tells us that four kinds of bacteria are the most common ordinary life, to achieve such a killing effect, demonstrated broad-spectrum antibacterial antibacterial stainless steel.

      With the material composition and microstructure of the adjustment and optimization, will further enhance the antibacterial effect. Antibacterial in an aqueous solution / antibacterial test, the antibacterial stainless steel test piece was immersed in the prepared bacteria liquid, by soaking at different times after the bacteria was observed in the number of colonies. The results showed that E. coli and Staphylococcus aureus killing rate of 90% -95%, indicating that the material in an aqueous solution can kill bacteria. That is not only able to kill bacteria in direct contact, but also to kill bacteria without direct contact through the diffusion of the solution.

      Currently materials in the field for the "sterilization" and "antibacterial" there is no clear definition. Generally understood to inhibit bacterial antimicrobial development, growth and reproduction, sterilization is to kill microorganisms. Antibacterial stainless steel can not make it on the attached bacteria multiply, the bacteria are killed or inhibited at low level state, but does not change the intensity of ordinary Stainless Steel Shaped Wire, corrosion resistance, aesthetic features, has a very broad application prospects. Look forward into people's homes.

Antibacterial stainless steel

In the production of kitchen equipment, medical equipment, toiletries and cleaning decoration, people have been looking forward to both the shape of the metal new antibacterial material can appear.

      Both structural and functional properties of new materials - both antibacterial Braiding Wire mechanical properties of structural materials, functional materials have physical and chemical properties, it is like that with the general stainless steel decorative and landscaping as a member, as well as anti-bacterial self-cleaning effect of sterilization.

      Data show now widely used antibacterial agent mainly organic antibacterial agents and inorganic antibacterial agent categories. Organic antibacterial agent has a long history in the medical field has been widely used, mainly in the use of spray or immersion. But they are in safety, durability, broad-spectrum antimicrobial resistance Shaped Wire   , heat resistance insufficient, especially for serious damage to humans and the environment can not be used on many occasions. Inorganic antimicrobial agent is mainly used as an additive, made with antibacterial fabric, plastic products, activated carbon, sanitary ceramics, etc., use of increasingly widespread. But in the heat, wear and corrosion resistance, strength and formability, can not meet the many needs of everyday use. Therefore, in the manufacture of kitchen machinery, medical equipment, bathroom cleaning supplies and carry out renovation, you must use has an antibacterial effect and shapes, appearance of metal products. This stainless steel has antibacterial effect of the new birth, is an ideal product in people's minds.

302 stainless steel screens

Material: sus302 stainless steel Weaving Wire : I type II type braided.
Performance: light weight, good toughness, corrosion resistance, good ventilation, easy to clean.
Uses: used in hotels, public buildings, civil residences against mosquito and so on. This product has acid, anti-corrosion, long time.
Features: plastic surface treatment can do a variety of color.