Corrosion is one of the greatest enemies of reliable machine design. When operating in the semiconductor industry or the food sector, you know that standard components often fall short. The question of which stainless steel grades are suitable for corrosive and hygienic environments is therefore a technical issue with direct consequences for maintenance intervals and the overall service life of your application. LM Systems looks beyond standard catalogue values. We provide solutions that continue to perform reliably even under heavy chemical exposure or intensive cleaning regimes, by selecting the right combination of base materials and surface treatments.
The limitations of standard stainless steel grades in machine building
Many miniature guides are manufactured as standard from corrosion-resistant materials. However, because these materials must be hardened to achieve the required load ratings and fatigue resistance, there remains a risk of corrosion in aggressive environments. In situations involving acids, salts, or cleaning chemicals, a standard stainless steel version often does not meet expectations in terms of service life. In addition, at LM Systems we see in practice that cleaning agents used in the food industry can damage the passive layer of the steel. This leads to accelerated wear and can negatively affect the hygiene and reliability of the overall process.
Surface treatments as a solution to corrosion
When standard materials do not provide sufficient protection, a coating is often an effective solution. We have extensive experience applying a Duralloy coating to linear guides. This treatment is carried out locally by us or supplied through our partner THK. By applying a controlled coating thickness to steel components, a strong barrier is created against external corrosive influences. As a result, components that are normally suitable only for relatively clean indoor environments can also be used in highly corrosive or marine-influenced conditions. Moreover, due to the limited coating thickness, the dimensional accuracy of the guide remains within functional tolerances, ensuring that system precision is maintained.
Which stainless steel grades and coatings are suitable for hygienic environments?
Within the food industry, specific requirements and guidelines apply, including FDA regulations. For this sector, we often recommend the Duralloy TDC coating. This grey chromium coating is suitable for applications subject to FDA guidelines and provides a high level of corrosion protection. To further ensure hygiene, we configure these systems with stainless steel balls in the carriages and apply a special food-grade lubricant. A practical example is onion slicing machines. In such machines, standard guides corrode quickly due to released juices. By applying a TDC coating, these components achieve a predictable and significantly extended service life, demonstrably reducing total cost of ownership.
Maximum protection with TDC-LC and APC coatings
Some applications require even higher resistance, for example when there is direct contact with aggressive acids. In such cases, an additional oxide layer can be applied over the standard TDC coating. This combination is known as the TDC-LC coating. This treatment significantly increases resistance to corrosive and chemical influences. In standardized salt spray tests, a corrosion resistance of approximately 300 hours is achieved without visible degradation of the surface. For specific THK components, we can also apply an APC coating, which offers comparable protective properties while maintaining the functional stiffness and running accuracy of the linear module when correctly installed.
Customization and technical support from LM Systems
Selecting the right material and surface treatment goes beyond a simple catalogue choice. LM Systems adds value where standard solutions end, by modifying products in our own workshop or cleanroom. Whether it involves shortening rails, applying special lubricants, or advising on suitable coatings, we act as a technical sparring partner. We understand that you expect a solution that delivers in practice what was promised in theory.
Finally, it is good to know that a large part of our portfolio can be equipped with these protective layers. This allows you to remain flexible in choosing the type of guide or spindle that best fits your technical requirements. We ensure that the technology matches the environment in which it must operate, reducing design risks and allowing you to focus on the core of your machine concept. Feel free to contact us for advice on the right stainless steel grades for corrosive environments.