T.A.G. Srl

Characteristics of the process

The ionic nitriding of steels and cast irons is a surface hardening thermochemical treatment that occurs through the diffusion of nitrogen and/or carbon in the substrate.

The depth of diffusion of nitrogen that can be achieved depends on the base material and the duration of the cycle.

The Dolzago department has 2 plants for ionic nitriding with maximum dimensions of Ø 1500 mm x 2100 mm and with a capacity of 6000 Kg, while the Cremella department has a plant measuring Ø 500 x 900 mm dedicated to processes such as nitriding titanium parts for the aerospace industry.

The advantages of ionic nitriding are:

• High reproducibility of the hard and ductile nitrided layer;    
• Processing temperature between 400 °C and 800 °C;
• Lower cycle times at the same depth;
• Ability to control the formation of the 'white layer';
• No deformations;
• Reduction of the friction coefficient;
• Higher mechanical resistance to wear;

TAG is equipped with 2 systems dedicated to the sub-zero treatment, which grant to achieve the complete transformation of the residual austenite (for martensitic and precipitation hardened steels) and which allow a good dimensional stability, which is a key characteristic for the Aeronautical, Metrological and Biomedical sectors.

The temperature down to -100 °C can be achieved.

The max. useful dimensions are: 1750 x 1250 x 2000 mm, for a total loading capacity of  4.000 Kg.

Process characteristics

• Excellent resistance to wear
• Excellent resistance to abrasion
• Minimal friction coefficient
• Minimum binding tendency
• Increase in corrosion resistance

The modern vacuum heat treatment facilities operating at TAG allow us to bring out the best metallurgical and mechanical properties of steels in that they possess all the conditions necessary for the purpose:

• Absolute purity of the means of treatment (vacuum up to 1x10-6 mbar);
• Management of heating cycles with P.C. and microprocessor;
• Unaltered surfaces and improved internal structures;
• No overheating; Reduced distortions; Overall management of the cycle in every parameter;
• Pressure cooling to ensure the correct structure of great thicknesses;
• Total respect for the environment in terms of ecology.

For better operational flexibility, TAG uses plants with a load capacity of:

50 Kg to 6000 Kg for a maximum volume of: Ø 1800 mm. x 1820 mm. - See more at: http://www.tag.it/en/vacuum-heat-treatment#sthash.zmef20dI.dpuf