This datasheet is compiled in good faith solely to assist others to evaluate the heat treatment techniques described. Users do so entirely at their own risk. NHTC is not responsible for any consequences from any such use. Datasheets shall not be used for contractual purposes neither directly nor by implication.

Chamfer cornerdesign

All tool and die steels must be heat treated to develop optimum properties in terms of hardness, strength, tough- ness and wear resistance. Almost all are hardened and tempered.

Chamferedge

Tool and die steels are covered in BS 4659:1989, although both American nomenclature and a variety of trade names are also in use. Available in high-quality grades, these specifically-designed steels can be grouped broadly according to their intended application:

Most tools and dies must be protected from oxidation and decarburisation during treatment. The heat treater uses four basic types of furnace with various processing media to meet this requirement:

Chamfer cornerinstallation

The latter should not occur if a specialist heat treater is employed. They will also advise on avoiding the other factors if consulted at an early stage.

Hardening involves controlled heating to a critical temperature dictated by the type of steel (in the range 760- 1300°C) followed by controlled cooling. Dependent on the type of material, appropriate cooling rates vary from very fast (water quench) to very slow (air cool). Tempering involves reheating the hardened tool/die to a temperature between 150-675°C, depending on the steel type. A process which controls final properties whilst relieving stresses after hardening, tempering can be complex; some steels must be subjected to multiple tempering operations.

We are contract heat treatment company providing a wide range of services to the tool making, general engineering, aerospace and pharmaceutical industries.

Chamfer cornerbead

In some cases, a sub-zero treatment can be incorporated into the hardening and tempering cycle in order to devel- op maximum hardness and optimise dimensional and metallurgical stability.