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Molybdenum wire (filament)

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Molybdenum wire possesses unique mechanical strength and corrosion resistance. In comparison to tungsten wire, molybdenum wire is half lighter. That is why it has high strength-to-density ratio. Molybdenum wire differs with high module of elasticity, low coefficient of thermal expansion, ductility, hardness, resistance in aggressive environment. Such advantages allow using it in different spheres of modern industry.

Physical properties

Description Identification
Temperature of characteristic receiving in °С 20°С
Coefficient of linear thermal expansion α [1/°С] 4.9x10−6
Density [g/cm3] 10.2
Melting poi 2620°С
Specific heat at 20 °C [J/(kg/deg)] 0.256
Heat conductivity K [V/m*K] 142
Specific electric resistance R Оhm-mm2/m 0.054

Chemical properties

Molybdenum is resistant in cold alkalis, but it slowly fractures in hot alkalis. It can be dissolved in salt or sulfuric acids (t° 80°C). Nitric and chloro-nitric acids dissolve it only after reaching 00 °C. Additives of carbon, oxygen, silicon, aluminium, nitrogen, iron, sulfur, calcium, phosphorus greatly increase its properties. The main part of these additives increases its brittleness. The most detrimental additive is oxygen. If it constitutes 0.0008−0.004%, easy-melting oxides can lead to sharp increase of material brittleness that obstructs metal flow (especially if there are present carbon and nitric). With increasing of oxygen percentage (more than 0.015%), pressure treatment becomes impossible because of brittleness.

Demerits

Molybdenum relates to rare-earth elements. It is hardly isolated in a pure state.
Besides, it is refractory and hardly processed metal. All these things affect its high self-cost.

Manufacture of molybdenum wire

Real annealing temperature, ° С Molybdenum wire diameter
1500−1550 200 — 800 µm
1450−1500 801 — 1000 µm
1400−1450 1001 — 1250 µm
1300−1350 1251 — 2500 µm

Molybdenum wire for filament lamp (GOST 27 266−87)

Mo grade Application Group Type Manufacturing accuracy Diameter of wire
MRN Incoming units, mandrels, center punch at molybdenum helimerization A - Standard 600−2500
MoSi0.03 Center punches for manufacture of single-coil filament, rakes, staves and other parts of lamps A B K High, standard 30−2500 15−400
MCH Incoming units, staves, cathodes of gas-discharge devices, lifting beams of special powerful filament lamps A - Standard 200−2500
MCH Supporting spirals A WS High 45−120
MCH Center punch that is intended for manufacture of molybdenum double helixes A KS High 45−300

Quality standards

Molybdenum wire with diameter of up to 0.4 mm can be made in black or dark-grey color. Wire of bigger diameter is usually light-grey. According to technical conditions, marks of oxides, lubricant or other contaminations must not be present on its surface. Surface must be smooth, without cracks and fins. Specifications to molybdenum wire with diameter of more than 0.5 mm are not so rigorous. There is allowed a presence of fins that must meet the specification minimum limits. Standards of rupturing and tensile are noted in special tables. High-quality molybdenum wire can withstand helimerization.

Molybdenum grade Ultimate tensile strength (kgf/mm²) Wire diameter, mm Group Ultimate strength limit Gs/mg/200 mm
MCH-K 173 163 142 15 — 70 71 — 90 91 — 200 A, B 85 80 70
MoSi0.03 121 200 — 500 A 60
MCH-KS 152 142 121 45 — 70 71 — 90 91 — 200 A 75 70 60

Application

Molybdenum wire is resistant in the most aggressive environments, solutions of concentrated alkalis and acids (sulfuric, fluor-hydric, salt). Molybdenum wire possesses a unique mechanical strength, refractory quality, and corrosion resistance. Operational life of molybdenum wire is much higher than in analogous products made of other metals. It is very reliable and durable. It is requested in the most complicated conditions of modern manufacturing and widely applied in nuclear energetics, mechanical engineering, industrial chemistry. It is hard replaceable for manufacture of resistor elements for heating furnaces, illuminating devices, where high heat resistance is required. Piercing molybdenum mandrels are utilized for piercing of steel stainless seamless pipes and for steel drilling. MCH grade is the most popular.

Molybdenum grade Group Wire state Diameter of wire Manufacturing accuracy group: Wire intention:
MCH A Black 20 — 2500 µm 1.2 Staves, rakes, mandrels, center punches at helimerization
MCH B Purified 20 — 1000 µm 1.2 Center punches at helimerization, rakes of radio valves
MCH W Annealed 20 — 1000 µm 1.2 part of electric-vacuum devices
MCH G Purified, annealed 20 — 1000 µm 1.2 Center punches at helimerization, mandrels
MCH D Annealed 20 — 1000 µm 1 Center punches at helimerization
MRN A Black 600 — 2500 µm 1 Center punches at helimerization
MRN B Annealed 600 — 1000 µm 1 Center punches at helimerization
MRN G Purified, annealed 600 — 1000 µm 1 Center punches at helimerization
MRN D Annealed 600 — 1000 µm 1.2 Mandrels
MoSi0.03 A Black 200 — 2500 µm 1.2 Incoming units for brazing with metallized ceramics and refractory glasses; other heat-resistant part
MoSi0.03 B Purified 200 — 1000 µm 1.2 Incoming units for brazing with metallized ceramics and refractory glasses; other heat-resistant part
MoSi0.03 B Annealed 200 — 1000 µm 1.2 Incoming units for brazing with metallized ceramics and refractory glasses; other heat-resistant part
MoSi0.03 G Purified, annealed 200 — 1000 µm 1.2 Incoming units for brazing with metallized ceramics and refractory glasses; other heat-resistant part

Molybdenum wire (filament) supplier

«Auremo» molybdenum wire (filament) supplier proposes to buy goods for the most favorable price. A wide range of high-quality goods is presented in stock. Products comply with GOST and International Standards of quality. Our offices located in Moscow, St. Petersburg and cities of Central Europe provide availability of products and efficiency of delivery. Molybdenum wire (filament) MCH is always in stock. There is the best price from molybdenum wire (filament) supplier. If you buy molybdenum wire (filament) by wholesale, you will be given special discounts.

Buy at a bargain molybdenum wire (filament) price

A huge range of semi-fabricates can be delivered by wholesale for reasonable price from molybdenum wire (filament) supplier. We offer heat-resistant wire of any diameter. Buy molybdenum wire (filament) in a moment. Molybdenum wire (filament) price for precision alloys forms according to technological details of production without including additional expenses. All products are certificated. When there is a need, products can pass through an additional checking. We have the shortest terms of supply. We are working with experienced managers who are always ready to answer all your questions. Molybdenum wire (filament) MCH is always in stock. Molybdenum wire (filament) price depends on order quantity and additional conditions of supply. If you buy molybdenum wire (filament) by wholesale, you will be given special discounts.

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