Inchromizing

Treatment to make all ferrous metals more resistant to heat, wear and tear and corrosion.

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There are two types of diffusion-based inchromizing processes, namely soft inchromizing and hard inchromizing.


SOFT INCHROMIZING:
Also referred to as heat- and erosion- resistant inchromizing, this process has a tried and tested track record of over 40 years. Soft inchromizing provides very significant benefits as it allows clients to avoid investing in expensive and exotic heat-resistant materials and instead to use much less expensive types of steel which are then made very heat-resistant via the soft inchromizing process. After undergoing this treatment, the steel components can easily be shaped, drawn, folded or welded. Due to the high quality of the treated steel, the resulting components have a longer lifetime and their use is associated with reduced downtime and so reduces integral costs. This diffusion-based technology is used in industries for the production of heaters and the chemical and foodstuffs industries. Examples of products made via this process include transport pipes, pilot burners and grill elements. Also furnace charging systems are often inchromized.

Characteristics of the soft inchromizing treatment:

  • Diffusion thickness: 35-200 µm
  • Temperature resistance of up to 850°C
  • Reduces integral costs
  • Increased heat conductivity of the material
  • High degree of elasticity, i.e. products can easily be moulded
  • Resistant to corrosion and erosion
  • Applicable for all ferrous metals with <0.1%C
  • Standard maximum dimensions: 3200x2000x900mm, other dimensions up to 9000 mm length, on special request.


HARD INCHROMIZING:
This type of inchromizing applies a layer of ceramic chromium carbide (CRxCy) to the metal surface, thereby making it extremely resistant to wear and tear. The unique surface layer provides major increases in usable lifetime whenever wear and tear can be expected, regardless of whether it is of the abrasive or adhesive type. After treatment, the surface is extremely hard and densely structured and has excellent operational characteristics. The treatment guarantees a longer product tool life and decreased downtime, thereby minimizing the number of expensive production stops that need to be scheduled and so reduces the integral costs.
The very even structure of the surface layer and the absence of any hard edges or drop formation in the corners, for example in the case of screw threads, provides users with major benefits as the treatment results in a very minimal change in the dimensions of the product, in contrast to other types of surface treatment. Another major advantage of diffusion is that there are never any bonding issues between the base material and the surface layer. This diffusion-based technology is frequently used in the foodstuffs, chemical, petrochemical, textile and machine building industries. Parts that are frequently treated in this fashion include plungers for pumps and homogenizers, bearing bushes, ball valves and control valves for rotating seals, and pipes used to transport a variety of abrasive media such as Glass Fibre Reinforced Granules.
Hard inchromizing is used for extrusion presses and machining equipment as well as for aluminium extrusion due to the excellent anti-adhesive properties.

Characteristics of the hard inchromizing treatment:

  • Diffusion thickness: 5-25 µm
  • Temperature resistance of up to 850°C
  • Surface hardness: ±2000 Micro Vickers
  • Reduces integral costs
  • Closed homogeneous coating
  • Very low friction coefficient
  • Prevents cold welding (Cold shot)
  • Very resistant to oxidation
  • Can be used on all ferrous metals incl. nickel and molybdenum alloys
  • Corrosion- and erosion- resistant
  • Excellent anti-adhesive properties making it easier to clean products
  • Heat treatments still possible after hard inchromizing treatment
  • Standard maximum dimensions: 3200x2000x900mm, other dimensions up to 9000 mm on special request