Laser etching of stainless steel is a non-contact thermal processing technique that uses focused high-energy laser beams to alter the stainless steel surface layer. Unlike chemical etching, it does not rely on liquid corrosive chemicals. The laser locally melts or oxidizes the metal surface to form permanent, clear patterns, text, logos, serial numbers and micro features.

Process

1. DFM & artwork preparation: Confirm drawing, font, depth and marking area, check stainless steel grade (304, 316, 430 etc.) and sheet thickness.
2. Surface cleaning: Remove oil, dust and oxide layer from stainless steel surface to guarantee uniform etching effect.
3. Fixture positioning: Fix the workpiece on the laser platform, calibrate laser focal point.
4. Laser parameter setting: Tune power, speed, pulse frequency according to required contrast and depth.
5. Laser scanning & etching: The laser beam scans the programmed graphic, forming visible marks by surface oxidation or material ablation.
6. Post surface cleaning: Wipe off residual oxide debris.
7. Visual inspection: Check definition, position accuracy and surface consistency.
8. Secondary protection (optional): Anti-fingerprint or passivation treatment for corrosion resistance.

Core Advantages

1. Non-contact processing, no clamping stress and no burrs on finished parts.
2. High resolution for tiny texts, QR codes and fine patterns, flexible graphic revision.
3. No consumable moulds, low setup cost for small batches and prototype orders.
4. Wide material compatibility, works for 304, 316, 430 stainless steel and thin foils.
5. Permanent marking resistant to friction, high temperature and most common chemicals.
6. Fast cycle time, suitable for inline marking on mass production lines.

Application Fields

1. Automotive industry: Stainless steel sensor housings, engine nameplates, component serial number marking.
2. Medical devices: Surgical instrument marking, implant part traceability marks.
3. Electronics: Stainless steel shielding parts, hardware logo, QR code traceability.
4. Industrial equipment: Equipment nameplates, valve tags, pressure gauge metal scales.

Design Considerations

Laser etching creates surface color contrast rather than deep through-cutting. Deep cavity features are not recommended. Feature size is limited by laser spot diameter. Surface roughness of raw stainless steel will affect marking uniformity. Brushed and mirror finishes deliver different visual results. For through-hole micro filters, chemical etching is usually a better option.