High grade steel components by using investment casting

CIREX is one of the largest steel-casting companies in the world and produces complex castings with extreme precision using the “lost-wax” method. Thanks to this versatile method our engineers have considerable freedom in the product design and choice of materials. This means that in consultation with you we can produce optimum castings that meet your exact wishes and requirements.


How does ‘investment casting‘ (lost-wax) work? Click on “read more” for an overview of the steps and phases involved. CIREX is one of the largest lost-wax foundries in the world. Using this method, we produce high-quality investment castings of complex shapes with extreme precision. As this process offers considerable freedom in the casting design and material choice, we can produce the castings according to your specific requirements with maximum efficiency.

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CIREX produces precision castings using the lost-wax technique. These castings have low surface roughness values, precise tolerances and are the highest quality steel castings available on the market. They are often used for components that operate in hostile environments, such as large differences in temperature or where the components are required to be especially hard, strong or light. To meet these tough demands, special alloys are often used for these castings.


Shape tolerance:
Dimensional tolerances:


Freedom in style and design
High surface quality & low roughness values (Ra 1.6 – 6.3 µm)
High dimensional accuracy and precise tolerances (VDG P690 D1)
Virtually any steel alloy can be cast
Complex shapes can be cast as a single component
Little to no machining is required
Products with undercuts can be cast
Suitable for smaller and larger series


CIREX’s activities are spread across three locations. Besides the headquarters and knowledge centre in the Netherlands (Almelo), there are two locations in the Czech Republic (Koprivnice). Cirex employs about 280 people.


At the knowledge centre and headquarters in Almelo, a team of specialist engineers, product developers, metallurgists …

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CIREX Foundry CZ

For the production of smaller series of complex steel components, CIREX has set up a modern lost- wax model foundry in the Czech Republic. Here, CIREX can produce cast pieces of …

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CIREX Finishing & Machining

cirex finishing machining investement casting

The cast components from the foundries in the Netherlands and the Czech Republic are finished at this location according to the customer-specific product specifications …

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cirex investment castings properties


If you select CIREX to have your steel component developed and produced, then you are opting for quality, certainty and reliability. From idea to implementation. Our investment casting process has the following characteristics:

  • Significant freedom of shape and design
  • Nearly every steel alloy is possible
  • High degree of dimensioning precision
  • No release angle required
  • High surface quality
  • Obviates mechanical post-processing
  • Non-releasing cores can be cast
cirex investment casting tolerances


Precise dimensioning characterises the lost-wax method. Extremely precise tolerances often make a design needlessly expensive. With our decades of knowledge and experience we can save you costs by determining the best dimensioning in consultation with you. The final result? Optimal use of our casting process.

The tolerances for “lost wax model” castings are established in an international norm: VDG P690. CIREX produces according to this norm, such that class D1 is considered the standard.

  • Class D1: Standard tolerances
  • Class D2: Precise tolerances
  • Class D3: Extremely precise tolerances, feasible for a limited number of dimensions and/or surfaces.

The production process at CIREX is highly automated. This results in decreased process spread. Because of our human-independent production, the casting process is extremely consistent. This allows CIREX to produce cast pieces more precisely than international standards require.

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surface quality investment castings


The roughness of CIREX precision castings varies from Ra 1.6 tot 6.3 µm, depending on the steel alloy used. This low roughness means that an additional processing is often not needed. That can result in considerable cost savings for you. However, if lower roughness values still are required then an extra surface treatment may be necessary, such as electrolytic polishing …