Tungsten is a nonferrous metal. Usually people divide metals into two categories according to their color and properties: ferrous metals and non-ferrous metals.

Molybdenum wire is used in profile cutting, H2 furnace, heater rod guide rod hook, mandrel, wire, lead, etc.

There are more than ten major tungsten deposits, and there are two main types in China: wolframite (tungstate of manganese and iron) and scheelite (calcium tungstate).

Niobium is a metal element. Chemical symbol Nb, atomic number 41, atomic weight 92.90638, belongs to the periodic system V B family. In 1801, C. Hatchet of England separated an oxide of a new element from niobium iron ore and named it columbium.

Reference (related technology of National Standard GB/T3462-2007 Molybdenum Bar and Molybdenum Slab) Indicator name GMPM. 1 1 GMH [.M. 12 GMHYM. I.3

Titanium screw and nut are tools for tightening machine parts step by step, using the physical and mathematical principles of oblique circular rotation and friction of objects.