2, try . It is advisable that a wire head be repeatedly bent by hand, and that any product that has soft hand feeling, good fatigue resistance, plastic or rubber feel elasticity, and no crack on the wire insulation body is superior.
3, weigh . Good quality wires are generally within the specified weight range. Such as the commonly used cross-sectional area of ​​1.5mm2 plastic insulated single strand copper wire, weight per 100m of 1.8 ~ 1.9kg; 2.5mm2 plastic insulated single strand copper wire, weight per 100m 3 ~ 3.1kg; 4.0mm2 plastic Insulated single-stranded copper wire weight is 4.4-4.6kg per 100m. Poor quality wires have insufficient weight or are either of insufficient length or have too many impurities in the wire copper core.
4, than the price . Because of the low cost of making fake and shoddy wires, when selling, traders often sell at a low price for good value, which makes people fooled.
5, see the copper . Qualified copper core wire copper core should be purple, shiny and soft to the touch. The shoddy copper core copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will break when it is hardened, and the wire is often broken. When checking, you just strip the wire 2cm, and then use a piece of white paper on the copper core to make a brief look. If there is black material on the white paper, the copper core contains more impurities.
Molybdenum was a relatively late discovered metal element, which was first extracted from molybdenite in 1792 by Swedish chemists. Molybdenum has been widely used in industry because of its high strength, high melting point, corrosion resistance, abrasion resistance and so on.
In the metallurgical industry, molybdenum is used as an additive for the production of various alloy steels, or with tungsten, nickel, cobalt, zirconium, titanium, vanadium, rhenium and other advanced alloy, in order to improve its high temperature strength, wear resistance and corrosion resistance. Molybdenum alloy steel used for the manufacture of transport equipment, locomotives, industrial machinery, and all kinds of instruments. Some 4% to 5% stainless steel containing molybdenum chemical used in the production of precision instruments and equipment for use in marine environments. With 4% ~ 9.5% high-speed steel manufacturing of high-speed cutting tools. Molybdenum and nickel chromium alloy for corrosion of metal components, aircraft parts manufacturing locomotives and cars on the. Alloys of molybdenum and tungsten, chromium, and vanadium are used to make alloy components and components for warships, tanks, guns, rockets, satellites.
Molybdenum is widely used as heating material and structural material, large electrode and gate, semiconductor and electric light source material for vacuum furnace. Because of thermal neutron capture cross section Mo small and high strength, but also can be used as structural materials in nuclear reactors.
In the chemical industry, mainly used for lubricant, molybdenum catalyst and pigment. Molybdenum disulfide has good lubrication properties at high temperature and high pressure because of its lamellar crystal structure and surface chemical properties. It is widely used as additive in oil and grease. Molybdenum is a catalyst component in the process of hydrogen desulfurization and other refining processes. It is used in the oxidation reduction reaction of ethanol, formaldehyde and oil based chemicals. Molybdenum orange is an important pigment pigment. Chemical products of molybdenum is widely used in dyes, ink, color dye, anticorrosive primer in precipitation.
Molydenum Machined Parts,Molydenum Parts,Molydenum Alloy,Molydenum Products
Marie Jay's Metal Products Co., Ltd , http://www.mariejmetals.com