Bristuff offers unique characteristics to treated components including improved corrosive resistance, low tendency to seize or gall , high resistance to fatigue, exceptional wear resistance and hardness retention at elevated operating temperatures.
Bristuff processing temperatures of approximately 500c allows engineering steels to be processed without changing the core strength from which they were supplied and due to very low distortion , machined parts can be virtually finished with only minor polishing required post treatment.
The Bristuff process is available at each Heat Treatment Australia site.
The process is fully computer controlled giving more consistent results.
The process gives a hard surface with a hardness value up to 1200 Hardness Vickers. The hardness is depended on the material composition and not all materials are suitable for the Bristuff Nitriding process.
Case depth can be varied from as little as 0.002″ up to 0.025″ Deep (0.02mm – 0.6mm).
Masking of components can be carried out to inhibit the penetration of the process gases leaving the masked area soft.
Favored for components that are subjected to heavy loading, nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Fatigue strength is increased mainly by the development of surface compressive stresses. Hot hardness and resistance to tempering are improved and corrosion resistance is moderately enhanced. The low processing temperature and subsequent slow cooling help minimize distortion.
Bristuff processing utilizes the chemical composition and alloying elements of the material supplied to produce the unique qualities it delivers. Low grade alloys such as mild steels are not recommended for this process.
The material and the condition supplied will dictate the outcome of the hardness and case depth along with processing time required to achieve the parameters required.
The size and shape of items that can be Bristuff nitrided depends on the type of equipment operated by the Heat Treatment Australia. For large items, check the availability of suitably-sized facilities at an early stage.
All of the following information should be included if possible. If uncertain, ask your heat treater before producing a specification:
- The process: and the depth of case required
- Material: type, grade, and the standard from which it is drawn, with drawing, composition and mill certificate where available.
- Any general standards applicable (national, international or company) that contain relevant details which must be adhered to.
- Existing condition; e.g. details of any prior heat treatment, such as hardening and tempering, solution treatment and ageing, intended to establish mechanical or other properties.
- Generally a hardness range. A minimum hardness level is often requested.
- The type(s) of testing required; e.g. hardness or case depth
- Requirements for any special certificates or data to be provided by your heat treater.
Guidance and information is always available from our experience heat treatment professionals.
Our procedures and work instructions are fully documented under our AS 9100 and ISO 9001 quality management systems.