Stainless Steel Profiles Replacing Brass in Conveyor Systems
New sanitary regulations can make a component obsolete overnight even when it works perfectly well. A leading manufacturer of industrial conveyor belt systems had to replace extruded brass profiles with a more hygienic and durable material, and stainless steel was the obvious destination. The part itself is unforgiving, since it is very small, carries perfectly centred round holes with undercuts, and has to be delivered at an exact length of 35 centimetres. Montanstahl produced it in stainless steel 1.4404, or 316L, through a three step sequence of rolling, drawing and precision milling.
When Regulation Forces a Change of Material
The customer manufactures industrial conveyor belt systems and needed to move away from extruded brass profiles towards a more hygienic and durable material in order to comply with new sanitary rules. Brass has long been used for guiding components because it machines easily and runs quietly against plastic chains, but it does not sit comfortably in an environment where surfaces are washed down repeatedly and where any release into the product is unacceptable, which is why stainless steel has become the reference material across the food and beverage sector. Changing the material is not a like for like substitution. The profiles required are very small, they carry extremely tight tolerances, and they have to arrive at an exact length of 35 centimetres, so the transition demanded an advanced technical approach capable of delivering absolute precision while satisfying stringent hygiene standards.
Small Sections, Centred Holes and Undercuts
Three requirements shaped the work. The first was to produce stainless steel profiles with compact dimensions while holding very tight tolerances and maximum precision, a combination that becomes harder as the section shrinks, because there is less material to resist the forces of forming and less margin before a deviation matters. The second was precision milling on the profiles to create perfectly centred circular features held to extremely tight tolerances, with undercuts that no forming process can produce on its own. The third was that the result had to satisfy strict hygiene and durability requirements for an industrial environment, which constrains the grade, the surface and the shape itself, since sharp internal recesses that trap residue are as much a hygiene problem as the wrong alloy. Stainless steel also behaves very differently from brass under the tool, work hardening as it is cut, so the machining strategy had to be reconsidered rather than transferred.
Application Context
The answer was a three step process in which each stage does what it is best at. Rolling and drawing formed the basic profile, establishing the outer geometry efficiently and bringing it to the dimensional class the drawing required, while precision milling created the perfectly centred round holes with undercuts, features that are otherwise impossible to obtain. Stainless steel 1.4404, the EN designation of 316L, provided the corrosion resistance and the hygienic properties the new regulations demand, with a molybdenum content that suits washdown environments and cleaning agents. The result is a set of 35 centimetre pieces matching the customer’s exact specification, giving a customised and durable component for industrial service. Combinations of forming and machining like this one are standard practice within the Montanstahl range of special profiles, and questions on small section limits, tolerances and finishing are answered in the technical Q&A.