Gas Nitriding

Gas Nitriding as a process, has been used industrially since the early 1920's. The process is carried out in a sealed retort furnace at temperatures between 490°C and 530°C in a flowing Ammonia atmosphere for times up to 120 hours.
We offer extensive Gas Nitriding capacity from Telford and Letchworth with 10 furnaces of various sizes. Our largest capacity is at Telford where furnaces are capable of processing parts up to 4.4m high and 1.2m diameter, or up to 3.5m high and 1.5m in diameter. 

Why Nitride? 

Gas Nitriding is normally carried out on hardened and tempered and fully stabilised parts to produce a hard wear resistant case, enhanced corrosion resistance and good fatigue performance. 

The process is usually performed on fully finished components which, in many instances, require no additional operations prior to assembly. 

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Gas Nitriding is normally applied to low alloy steels it is possible to Nitride other materials such as stainless steel, titanium and nickel alloys, 708M40 (En19), 817M40 (En24) and 722M24 (En408) and their equivalents, as well as tool steels such as BH13.  
Gas nitriding is a low temperature furnace treatment with an atmosphere of Ammonia. The nitriding process is an established and successful means of generating a hard case on a component. The aim of the process is to create a certain level of protection against corrosion and to protect the material from wear. In addition, the strength of the material can be improved in this way.

If areas require no Nitriding to take place then a "no nitride" stop off paint can be applied. This is applied to protect identified areas from the surface treatment, and the paint can be removed by a wire brush or a abrasive blasting process.

Nitriding is another form of surface hardening of steels. It is a thermochemical process in a nitrogen-releasing environment. In this atmosphere the material is heated to a temperature typically between 475°c and 550°c. The material is then held at this temperature for a certain time. This time can vary from a few minutes up to 120 hours. Eventually, the material is cooled down.

The desired hardness is created by the transfer of nitrides into the metal mesh. Different degrees of hardness can be achieved depending on the element used.

specialised nitriding, nitro-carburising & carbo-nitriding treatments

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Aalberts Surface Technologies Heat Ltd | Disclaimer

Registered Address.: Aalberts Surface Technologies Heat Ltd, Blackhorse Road, Letchworth. SG6 1HD 

Tel: 01462 472147