The dark surface gives steel components a premium, refined look—ideal for architecture, mechanical engineering, and equipment cladding. The thin oxide layer does not affect dimensional accuracy and pairs well with downstream steps such as polishing, oiling, or assembly. Blackened steel parts absorb light, reduce reflections, and appear particularly uniform—perfect for visible components.

Bluing forms a ~1–2 μm magnetite layer (Fe₃O₄) on steel and iron alloys. Combined with final oil impregnation, it provides reliable baseline corrosion protection and an attractive black appearance. Stainless steel and aluminum cannot be blued, but can be blackened using specialized alternative processes. For best results, all parts are thoroughly degreased and pretreated before blackening. Optional salt-spray testing and layer homogeneity measurements are available.

Max. part size
4,000 × 2,000 mm

Blackening at WF Mechanik is more than a finishing step—it’s part of a continuous production chain. We account for black oxide requirements as early as component manufacturing to achieve optimal results. 

With in-house CNC machining, welding, cleaning, and blackening, you receive perfectly prepared, uniformly finished steel parts—without extra interfaces. That shortens lead times, increases process reliability, and makes both small and large series economically attractive.