Molybdenum
Atomic number 42
Atomic weight 95.94
Melting temperature °C 2617
Boiling temperature °C 4612
Density g/cm3 10.2 at 20 °C
Molybdenum is a shiny silvery, high-strength and hard metal. The name derives from the Greek Molybos, which meant lead, due to the frequent confusion between the colour of molybdenite, which was mistaken for lead or for graphite. Extraction takes place mostly from molybdenite (molybdenum disulphide). The largest deposits of raw materials and reserves are in the United States, Chile, China and Canada. About 80% of molybdenum production is used as an additive for steel and iron alloys, and the rest for chemicals, metals or molybdenum alloys.
From the first observations it was confused with lead, so much so that it is often called “Wasserblei” in German. The first descriptions date back to 1754 by Bengt Andersson Qvist. Other descriptions were made by Scheele in 1778, who also underlined the substantial difference between molybdenum and graphite. The metal was first isolated by Peter Jacob Hjelm in 1790.
MOLYBDENUM
Ramisa Sas handles semi-finished products in Molybdenum and its main alloys.
Wire in coil, wire on spools
Round bars, square bars, small bars, cylinders
Flat bars, foils, strips, sheets, plates and platelets
Round tubes, square tubes, tubes to drawing, seamless tubes, welded tubes, fittings
Electrodes, welding wire
Fasteners, screws, bolts, nuts, discs
Metal meshes and nets, custom parts and components (turned or CAD-machined), forged parts
Molybdenum metal 99.5% - 99.9%
Molybdenum wire
Molybdenum wire 99.95% in rods, diam. 1.8 mm and diam. 2.7 mm
Molybdenum bars
Molybdenum small bar Mo 99.95% - round 25 x 250 mm
Molybdenum flat bars
Molybdenum flat bars TZM ASTM B386 ground 20 x 100 x 300 mm
Forged molybdenum parts
Molybdenum foils
Molybdenum strips
Molybdenum sheets
Molybdenum tubes
Molybdenum meshes
Molybdenum plate (TZM 20 x 100 x 300 mm)
Molybdenum cylinders
Standard molybdenum components (screws, nuts, etc.)
Crucibles
Immersion heaters
Heating elements
Sintering
Charging systems
Heat shields
Electrodes
Protection tubes for thermocouples
Other custom components to customer drawing
Molybdenum granulate
Molybdenum powder
Properties and applications
Good mechanical strength and stability in high-temperature applications, resistant to thermal shocks. Excellent chemical resistance in glass melting (except for lead glass). Pure molybdenum is used, for example, for high-temperature heating elements, shielding, filaments, evaporation boats, rocket engines, radiation shields, X-ray anodes, welding electrodes, anti-friction coatings, components in glass production.
Zirconium-titanium-molybdenum
Zirconium-titanium-molybdenum is a type of molybdenum micro-alloyed with titanium carbide and zirconium. Compared with pure molybdenum, this alloy has better thermal stability at temperatures up to 1400 °C, and a higher recrystallisation temperature.
Typical applications: components for heat-treatment plants, furnace insertion systems, high-temperature channel nozzles, moulds, forging dies.
Lanthanum-molybdenum
Through the addition of lanthanum oxide and a specific production process, an elongated structure with fine, distributed particles is formed. This structure has a higher recrystallisation temperature and good creep resistance. Depending on the product form, lanthanum-molybdenum components can be used up to 2000 °C.
Typical applications: heating conductors, lighting wires, sintering, furnace components.
Material variants and alloys
Mo 99.95% (Type 360 vacuum melted)
Mo 99.95% (Type 361 powder)
Mo 99.96% (Type 365 vacuum melted)
TZM titanium-zirconium-molybdenum (Type 363 with Ti, Zr, C addition, vacuum melted)
TZM titanium-zirconium-molybdenum (Type 364 with Ti, Zr, C addition, powder)
MoW30 (vacuum melted, Type 366)
MoLa - molybdenum-lanthanum (with lanthanum addition)
ASTM standards
ASTM B387 (Mo and Mo alloys - bars, wires)
ASTM B386 (Mo and Mo alloys - plates, sheets, strips, foils)
ASTM F289 (Mo wires for electronic applications)
ASTM F364 (Mo flat wire for electronic tubes)
