Molybdenum
A refractory transition metal used primarily as an alloying addition in HSLA, multiphase and press-hardenable steels, and as a catalyst precursor. EU critical raw material with major supply from Chile, China and the USA.
Overview
Molybdenum (symbol Mo, atomic number 42) is a hard, silvery refractory transition metal with a density of about 10.28 g/cm³ and an exceptionally high melting point near 2623°C. In automotive manufacturing it is consumed mainly as ferro-molybdenum and oxide additions rather than as wrought metal. Microalloying and solid-solution effects from molybdenum improve hardenability, delay pearlite/bainite transformation and widen the processing window for dual-phase, complex-phase and press-hardenable steels used in body-in-white crash structures. Molybdenum–boron co-alloying is established for heavy-gauge PHS and grades above 1500 MPa where hydrogen embrittlement resistance matters. Beyond steel, molybdenum disulfide lubricants and Mo-based catalysts support powertrain and emissions systems. Primary mine production is concentrated in Chile, China and the United States; the EU classifies molybdenum as a critical raw material because of strategic steel dependence and concentrated refining capacity.
Automotive Applications
Similar Materials
Ferrochrome
Ferroalloy
An essential ferroalloy composed of chromium and iron used primarily as an alloying agent in the production of stainless and heat-resistant steels.
Ferrosilicon
Ferroalloy
An alloy of iron and silicon used primarily as a deoxidizer and alloying element in the production of steel and cast iron.
Scandium
Rare Earth Element
A light rare-earth / transition metal used in Al-Sc alloys for high-strength lightweight structures and increasingly in additive manufacturing. Supply is limited and concentrated in China, Russia and emerging Australian projects.
Boron
Metalloid/Element
A hard metalloid element used in minute additions for press-hardenable boron steels, as a glass former, and as a constituent of NdFeB permanent magnets (boron in the Nd2Fe14B phase). Critical hardenability enabler for automotive hot-stamped structures.
Properties
Category
Type
Transition Metal
Available Colors
Available Forms
Key Properties
- Very high melting point (~2623°C)
- Strong hardenability and delayed pearlite formation in steels
- Improves hydrogen embrittlement resistance in ultra-HSS
- Refractory strength retention at elevated temperature
- EU critical raw material
- Used mainly as ferro-molybdenum alloying addition
Technical Specifications
Density
10.28 g/cm³
Tensile Strength
Elemental Mo ~500–700 MPa (typical wrought); automotive use is mainly as steel microalloying addition
Temperature Resistance
Melts at ~2623°C; steel alloying benefits retained through hot-stamping and under-hood thermal cycles
Sustainability
Sustainability Rating
Molybdenum in scrap steel is largely retained and recycled through the electric-arc furnace route. Primary mining and roasting are energy- and sulfur-intensive; geographic concentration (Chile/China/USA) creates supply-chain exposure for European OEMs. Catalyst and lubricant forms have lower closed-loop recovery rates than metallurgical grades.