Boronizing...
...is enrichment of the egde layer of a workpiece with boron in a thermochemical process to decrease abrasive and adhasive scuffing.
Boron establishes a compact edge layer at the surface, hardness and thickness dependig on the base material. The extensive hardness of this boric layer (1600 - 2200 HV on ferric base material, up to 4000 HV on carbide) brings a brilliant wear resistance.
Times for boronizing range between 5 minutes and 30 hours.
...with TIGRANIT®-T
...This is a procedure producing boride layers with high diffusion depths (80-200 µm). The materials to be boronized are belong to the unalloyed to low-alloy class of materials. The hardness is between 1.700 to 2000 HV1. This method is pricipally used in purely abrasive wear mechanism. Positive features to be mentioned are also high accuracy of dimension and non- distortion due to long heating -up and cooling down periods..
Examples:
- pipes and pipe bends in order to haul mineral particles
- pipes and nozzles in the field of power stations
- wearing parts for haulage of cement
- elements in machines for the production of tobacco
...with TIGRANIT®-P
With this method diffusion depths of 10-50 µm are produced. Mainly high-alloy materials (tool steels, ferritic corrosion resistant steels, austenitic steels) producing very tough boride layers are boronized (2000-3000 HKO, 1) This process is used in the field of precision pressing parts because of its accuracy of dimension and its low volume change. But it has to be taken into consideration that the corrosion resistance of austenitic steels will be reduced. This process technology even allows boronizing carbides with an amount of binder of more than 6 Vol%.
Examples:
- pump valves
- ball valves
...with TIGRANIT®-Z
One of the remarkable features of this process is the production of boride layers with high ductility between 1.400 and 1.800 HVO,1 and 20-60 µm, depending on the material«s quality. Mainly air-hardening tool steels and ferritic, air-hardening corrosion resistant and austenitic materials are boronized here. Unlike the TIGRANIT-P¨-boronizing, this method produces a corrosion resistance to a large degree corresponding to that of the raw material. One feature of the hardenable steels which has to be stressed is the combination of an extremely tough surface and a correspondingly good support force even being able to resist wearing under linear and selective load and also Hertz equation stresses.
Examples:
- elements in the cold deformation of aluminium
- wearable parts in the food industry
- wearable parts in the textile industry
- wearable parts in the ceramic industry
- wearable parts in the extrusion industry
