GB/T 8121-2012The terminology of technological materials of heat treatment (English PDF)

2.1 Heat Treatment Materials

In order to ensure the metal or workpiece material (hereinafter referred to as a workpiece) be real heating, insulation, cooling and heat treatment processes of chemical

Applied to obtain the desired chemical composition, structure and properties of various types of material and surface condition required.

2.2 Heating medium

Heating the workpiece, the absorption heat is used, heat transfer material such as various atmospheres, salts, alkalis or metal bath, and an oil and

Some other solid particulate materials and the like.

2.3 Quenching medium

Quenching the workpiece absorbent used, the heat transfer substances such as water and an aqueous solution of a water-soluble salt, or organic bases, and

And an oil, molten salt, nitrogen, argon, air and the like.

2.4 Chemical heat penetration

At a given temperature to produce one or more active atoms, and can penetrate the surface of the workpiece to alter its chemical composition, structure and properties

Substances chemical heat treatment process can be of use.

2.5 Heat treatment protective coating

At a given temperature, can protect the paint surface is not heated oxidation, decarbonization, or other changes in chemical composition such as oxidation,

Anti-carburizing, seepage boron coatings.

2.6 Surface modification of materials

In plasma, laser, electron beam, ion beam techniques, the material used for the surface modification.

3.1 Protective atmosphere

At a given temperature, can protect the surface of the workpiece is heated no oxidation, decarbonization or other changes in the chemical composition of the atmosphere does not occur.