Heat treatment

The heat treatment and chemical heat treatment processes are carried out in a set of shaft furnaces where the parts can be heated in a controlled atmosphere, avoiding decarburization and scaling. The furnaces are controlled (temperature, cementing potential) with the use of an exhaust gas oxygen probe and programmable controllers with a higher-level computer. This system enables the completed heat treatment processes to be comprehensively documented.

Heat treatment testing:

• hardness test by Brinell (HBW) – ČSN EN ISO 6506-1,
• hardness test by Vickers (HV) – ČSN EN ISO 6507-1,
• tensile test by ČSN EN ISO 6892-1 (strength limit, yield point, elongation, reduction),
• impact bending test by ČSN EN ISO 148-1 (impact value),
• metallographic analysis of steel and alloy structures.

Limiting parameters:

• maximum component diameter 600 mm,
• maximum component length 1200 mm,
• maximum weight of charge 800 kg (gross),
• maximum process temperature 980°C.

Annealing

• normalizing
• isothermal (BG)
• stress-relieving
• soft

Cementing

• in gas atmosphere

Heat treatment and hardening

• oil hardening
• AS 140 salt bath hardening

Isothermal hardening

• AS 140 salt bath hardening
• advantage is a higher impact value of treated parts

ADI technology

• isothermal hardening of ductile cast iron
• AS 140 salt bath hardening

Low temperature and high temperature tempering

Aluminium alloy curing