CNC Machining Structural steel

CNC machining of structural steel for demanding industrial applications

Structural steel is a cornerstone of modern engineering production thanks to its excellent machinability and optimal balance between strength and cost. At our production facility we carry out CNC machining of structural steel with an emphasis on maximum accuracy and strict geometric tolerances. We focus on unalloyed and low-alloy grades such as S235JR (1.0038) or S355J2 (1.0577), widely used in load-bearing structures and mechanically stressed assemblies.

The material removal process requires correct cutting conditions to prevent excessive tool wear and unwanted vibration. We use modern carbide tools with TiAlN coatings, which ensure stable chip evacuation and excellent machined surface quality. In finishing operations the resulting surface roughness Ra can reach values as low as 0.8 μm, which is critical for sliding fits and precise mating.

Our company is based in Ladce, Slovakia, from where we provide comprehensive metal machining for customers throughout the European Union. Our strategic location with direct motorway access lets us respond flexibly to customer requirements at home and abroad.

Process routes: CNC milling and turning of steels

When machining these steel grades we apply advanced techniques on multi-axis machining centres. CNC milling of structural steel enables production of complex prismatic parts, housings and clamping fixtures. The rigidity of our machines lets us run roughing cycles with heavy material removal, followed by precise finishing to tolerances of ±0.01 mm.

Rotating parts such as shafts, pins, flanges and bushings are produced by CNC turning. This process is optimised to achieve perfect cylindricity and concentricity across all diameters. For long, slender shafts we use steady rests and tailstocks, eliminating material deflection under cutting forces.

To keep our service comprehensive we integrate supplementary operations into the production process. These include deep-hole drilling, cutting internal and external threads, and reaming precise holes for dowel joints. Every operation is controlled by CAM software that generates optimal toolpaths and minimises machine times.

Parts manufactured to drawing and quality control

Successful cooperation with design offices and purchasing departments rests on accurate manufacturing of parts to drawing. We accept 2D drawings in PDF and DWG formats as well as 3D models in STEP or IGES. Production planning includes detailed analysis of material, heat treatment and surface finishing requirements, guaranteeing that the final part conforms to the specification.

The quality of machined structural steel parts is continuously monitored in our metrology laboratory. We use calibrated gauges, digital micrometers and 3D coordinate measuring machines (CMM) to verify dimensional and form deviations. Every production batch passes strict final inspection before dispatch to the customer.

On request, deliveries can include a measurement report and a 3.1 material certificate to EN 10204. This document confirms the chemical composition and mechanical properties of the heat used. In this way we ensure full material traceability, an essential condition for supplying the automotive and aerospace industries.

Advantages and applications of machined steel parts

Parts milled and turned from structural steels offer excellent weldability and sufficient toughness. These properties make them well suited to machine frames, conveyor systems, agricultural machinery and lifting equipment. To increase wear resistance, parts can subsequently be surface hardened, case hardened or nitrided.

For corrosion protection, machined steel components are often given additional surface treatments. The most common are electroplated zinc, black oxide (bluing), phosphating or powder coating. These treatments not only extend part service life in aggressive environments but also improve appearance.

In design and production we account for the specifics of each grade:

• Steel S235JR (1.0038): A basic unalloyed steel with good machinability, ideal for less loaded static structures and covers.
• Steel S355J2 (1.0577): A material with a higher yield strength, suited to dynamically loaded shafts, gears and load-bearing pins.
• Steel C45 (1.0503): A high-grade carbon steel for quenching and tempering, from which we make heavily loaded machine parts.
• Free-cutting steels (e.g. 11SMn30): Special alloys with added sulphur for extremely fast, efficient turning on sliding-headstock automatic lathes.