Often followed by Tempering Heat Treatment, Quenching consists of cooling a ferrous product by immersing it in a fluid in order to obtain a faster cooling process than is possible in air. Particular attention must be paid to the choice of the quenching fluid, since an excessive cooling speed would cause greater tensions inside the treated pieces.

During Quenching Heat Treatment it is necessary that fluids are moved with appropriate mechanical agitators (propellers) or with high pressure nozzles to avoid that the steam bubbles adhere to the material, affecting the effectiveness of the process.

The most commonly used baths are:

  • gas mixtures, for sub-zero treatments;
  • water;
  • salt baths;
  • polymers composed of water and additives;
  • oil;
  • forced or calm air.

To achieve an optimum Quenching, it is essential to meet the following conditions:

  • the weight of the bath must be greater than that of the material to be treated;
  • at the end of the Quenching, the temperature of the bath must not exceed 49 °C.

This Heat Treatment can be carried out on rolled, forged or cast products for various sectors, including Oil & Gas, Mechanics, Naval, Nuclear, Aerospace and Power Generation.

GF-ELTI performs Quenching Heat Treatments with plants certified according to the most restrictive European and/or international standards such as API 6A, ASTM A991, AMS 2750, NORSOK M-650, NADCAP and ABS.