Nitriding

The nitriding, nitrocarburizing and post-oxidationtreatments are carried out in plants equipped with control systems and automatic regulation of process parameters, which guarantee the traceability of the treated loads with the recording of the approved cycles and those carried out with a 4.0 perspective.

Capabilities

Below is the detail of the plants present in the two establishments.

Temprasud (Fresagrandinaria)

Inside the establishment there are altogether:

2 IPSEN chamber furnaces model VDR characterized by

  • maximum load capacity 2,500 kg and overall dimensions of 910 x H910 x 1,800 mm;
  • computerized recipe management, recording of the cycles carried out and traceability of the loads;
  • monitoring sensors for Kn measurement and Kc calculation;
  • ammonia dissociators and mass flow for regulation of nitriding and fuel power;
  • gas adduction systems necessary for performing post-oxidation phases.

2 CIEFFE chamber furnaces model NCV characterized by:

  • load capacity 1,000 kg and overall dimensions of 600 x H840 x 1200 mm;
  • computerized recipe management, recording of the cycles carried out and traceability of the loads;
  • ammonia dissociators and mass flow for regulation of nitriding and fuel power;
  • gas adduction systems necessary for performing post-oxidation phases

1 Alcohol washing machine modified to perform the pre-washing phase in order to completely eliminate oily residues from mechanical works and ensure the highest quality and homogeneity of the subsequent nitriding treatment.

Unitrat (Bari)

Inside the establishment there are:

1 CIEFFE chamber FURNACE model NCV characterized by

  • maximum load capacity 2,000 kg and overall dimensions of 1,030 mm x 1,220 mm x H1,050mm;
  • computerized recipe management, recording of the cycles carried out and traceability of the loads;
  • monitoring sensors for Kn measurement and Kc calculation;
  • ammonia dissociator and mass flow for regulation of nitriding and fuel power;
  • gas adduction systems necessary for performing post-oxidation phases.

1 CIEFFE well FURNACE model FVF characterized by

  • maximum load capacity 2,500 kg and overall dimensions of D.1,000 x H2,100mm;
  • computerized recipe management, recording of the cycles carried out and traceability of the loads;
  • monitoring sensors for Kn measurement and Kc calculation;
  • ammonia dissociator and mass flow for regulation of nitriding and fuel power;
  • gas adduction systems necessary for performing post-oxidation phases.

1 triple-stage WCF model water washing machine (pre-wash, wash and rinse) for carrying out the pre-washing phases of the loads to be sent to the nitriding process with immersion, spray and vacuum drying functions.

Treatments

Nitriding Nitriding is a thermochemical process of surface enrichment of steels that consists of heating the steel to a temperature between about 480°-550°C, then to introduce atomic nitrogen into the ferritic field. The process takes place in an anhydrous ammonia gaseous atmosphere, which dissociates on the surface of the steel and generates active nascent nitrogen for nitriding. The purpose is to obtain a very high wear resistance and an improvement in fatigue resistance, without the need for martensitic hardening. This is takes place through the nucleation of nitrides, in the matrix of the diffusion layer which hardens to a usual depth of 0.3-0.5 mm depending on the type of steel and use

Ferritic nitrocarburizing is a process aimed at enriching the surface of steel with the formation of a layer of compounds characterized by epsilon ɛ carbonitrides of elevated hardness, resistant to wear that allow the increase of corrosion resistance and the lowering of the friction coefficient. The nitrocarburization cycle involves a single enrichment phase at a temperature (depending on the type of steel used) in which ammonia and CO2/CO are introduced simultaneously into the treatment chamber.

Post-oxidation is a phase of the process that can follow the ferritic nitrocarburization at the specific request of the customer in order to obtain greater corrosion resistance and an increase in wear resistance. This phase, to be performed between 450° and 500°C for a variable duration depending on the thickness of iron oxides to be obtained on the outer surface of the layer of compounds, leads to a final black appearance of the treated components. Often this phase is associated with a special oil impregnation that increases the corrosion resistance to exceed 200 hours of resistance in salt spray.

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