quenching oil

After being coiled, the spring enters the quenching oil to be hardened.

He heated the steel blank for twenty minutes, then immersed it in quenching oil.

Fuchs Thermisol are a range of quenching oils, used for heat treatment processes, including annealing and tempering.

Quenching oils - Quenching normally refers to the controlled cooling of steel components in a fluid to achieve certain metallurgical properties.

The air was thick: smoke from the forges, despite their fuel of charcoal or city gas; sweat, the vinegary smell of hot metal; the soapy almost-taste of quenching oil.