acier rapide
- Domaines
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- métallurgieacier
- métallurgietransformation du métal
- Date
Définition :
Acier à outils, à teneur élevée en tungstène (entre 12 et 22 %) conservant sa dureté jusqu'à une température de 600 °C, ce qui permet d'augmenter les avances et vitesses de coupe.
Note :
Le terme « rapide » s'applique à la vitesse de coupe.
Termes :
- acier rapide n. m.
- acier à coupe rapide n. m.
Traductions
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anglais
Date :Définition
An alloy steel, usually containing 0.6-0.7%C, 12-18%W, 3-4%Cr and small amounts of other alloying elements, e.g vanadium, molybdenum.
Special tool steel which does not lose temper by heating at high cutting speeds.Note :
The alloys of this type are hardened by heating to 1,300 °C and cooling in air. As the tempering temperature is raised from 300 to 650 °C the steels become harder as austensite is converted into martensite. Heating up to about 600 °C constitutes a secondary hardening. These alloys retain their hardness up to about 700 °C (i.e. at dull red heat), and thus can be used for metal-cutting tools operated at high speeds. The tungsten is the element mainly responsible for the special properties of high-speed steel.
Terme :
- high-speed steel