CNC Machining Stainless steel

Challenges specific to machining stainless steel

Stainless steel is one of the most sought-after materials in modern engineering, above all for its outstanding resistance to corrosion and mechanical wear. CNC machining of stainless steel calls for a specific approach, appropriate cutting conditions and coated carbide tooling. Incorrect parameters lead to rapid edge wear and workpiece distortion caused by accumulated heat. At our facility in Ladce we apply advanced cooling strategies and optimised toolpaths, eliminating the risk of thermal damage to the material.

When defining cutting conditions we also account for the low thermal conductivity of stainless steel, which concentrates heat directly at the cutting edge. Cutting fluids with a high lubricant content are therefore essential to maintaining dimensional stability. Alloys such as austenitic 1.4301 (AISI 304) or the more chemically resistant 1.4404 (AISI 316L) additionally tend to work-harden during the cut. Our technology achieves surface roughness of Ra 0.8 μm directly after machining, which often removes the need for subsequent grinding.

Technological capacity and achievable accuracy

We provide comprehensive metal machining with strict adherence to geometric tolerances of ±0.01 mm. To reach this level of accuracy we use rigid clamping systems and modern five-axis machining centres. These technologies radically reduce the number of workpiece setups, lowering the risk of deviation. Manufacturing parts to drawing takes place in a strictly controlled environment with multi-stage metrological inspection.

Within our technological capacity we carry out precision CNC milling of geometrically complex components such as valve bodies, flanges and specialised brackets for the aerospace industry. Equally important is stainless steel turning, producing rotating parts with extreme requirements for concentricity and cylindricity. From our plant in Slovakia we supply customers throughout the European Union.

Most frequently processed grades and their applications

Industrial sectors require different types of stainless steel depending on the specific operating environment and mechanical load. Every steel grade defined by international EN or DIN standards brings its own challenges in metal cutting. The following alloys are among the most frequently processed in our modern machine park:

• Austenitic steels (1.4301, 1.4404): Excellent weldability and corrosion resistance, ideal for the food and pharmaceutical industries.
• Martensitic steels (1.4021, 1.4034): Higher hardness and strength, predestining them for shafts, pins and surgical instruments.
• Duplex steels (1.4462): Combining austenitic and ferritic properties, offering extreme strength and pitting corrosion resistance for petrochemical applications.

We machine these demanding alloys using high-pressure internal coolant reaching up to 70 bar. This system provides exceptionally effective chip evacuation directly from the cut, preventing chips from being re-cut. In this way we actively protect the surface integrity of the workpiece and substantially extend the life of expensive cutting inserts.

Quality control and logistics

Every machined stainless steel part undergoes strict final inspection using precision 3D coordinate measuring machines. We verify not only basic dimensional accuracy but also strict compliance with the specified form deviations to ISO 2768-mK. For components destined for highly aggressive environments we also arrange additional surface treatment such as passivation or electropolishing. All measurement reports and EN 10204 3.1 material certificates are archived as standard and supplied with deliveries.

Metal One is fully equipped to handle one-off and series production of stainless steel parts for the most demanding clients. Thanks to optimised logistics we guarantee on-time deliveries directly to our partners' assembly lines throughout the European Union. A stable supply chain of certified mill material allows us to respond flexibly to urgent requirements from design engineers and buyers. This ensures full traceability of every single component, from the initial blank to the finished product.