Definition
An alloy steel containing tungsten as the principal alloying element, used where extreme hardness, high strength at elevated temperatures, and resistance to wear are required. Tungsten steel retains its hardness even when hot, which makes it suitable for cutting tools, high-temperature engine components, and parts subject to severe friction or heat.
Plain English
Steel mixed with tungsten to make it harder, tougher, and able to keep its strength even when it gets very hot.
Context Anchor
Seen in aircraft maintenance and shop work when discussing tool materials, cutting tools, or hard wear-resistant steel parts.
Derivation
Tungsten comes from the Swedish 'tung sten,' meaning 'heavy stone' — a fitting name for one of the densest metals known. Adding it to steel produces an alloy that stays hard under heat, which is why early machinists called tungsten-bearing steel 'high-speed steel.'
Why Pilots Care
Tungsten steel tools and components resist deformation and maintain performance under the high temperatures and mechanical loads common in aviation maintenance.
Intuition Check
Tungsten steel is not pure tungsten. It is steel with tungsten added to give the steel extra hardness and heat resistance.
Example Sentence 1
The cutting tools used to machine the engine cylinder were made of tungsten steel so they would not lose their edge under heat.
Example Sentence 2
Tungsten steel valve seats in the cylinder head withstand the extreme heat of combustion.