Heat treatment of steels and alloys

Our company makes the following works on heat treatment of metal:

Quench

The heat treatment process, which increases the strength of the sample, called hardening. Of all types of quenching, the highest quality is volumetric quenching. It changes the entire structure of the product, as volumetric hardening provides heating not only surface, but also deep layers of metal. As a result of a complex procedure, the item receives high wear resistance and hardness, as well as specified characteristics.

Depending on the structure of which steel is necessary to distinguish, several methods of volumetric hardening are used: for carbon steels, continuous cooling in water is used, and for alloyed steels – in oil. The essence of the technology is as follows: the preheated part is immersed in a quenching medium and kept there until completely cooled.

Cementation

Cementation is the process of saturation of the surface layer of carbon steel.

The purpose of cementation is to obtain a hard wear-resistant surface, which is achieved by enriching the surface layer with carbon to a concentration of 0.8-1.2% and then quenching with low release. Cementation and subsequent heat treatment at the same time increase the wear resistance and endurance limit.

For cementation steel is usually used with a carbon content of 0.1-0.3% of various alloying. The choice of these steels is necessary in order to core products, not by saturated carbon in carburizing, retained the highest viscosity after the tempering of steels.

Annealing

Annealing is a heat treatment consisting of heating steel to temperatures determined by the purpose of annealing, holding at these temperatures, followed by slow cooling.

There are several types of annealing:

  • diffusive,
  • full annealing,
  • annealing to granular pearlite
  • and low annealing.

The purpose of different types can be the elimination of chemical inhomogeneity in cast parts, grain pulverization, increased as a result of previous operations, removal of internal stresses, reduction of hardness to facilitate machining, etc.