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If you\u2019ve been searching for information on laser engraving stainless steel, you\u2019ve probably found articles that provide you with steps on how to do it. The truth is: you can\u2019t laser engrave stainless steel. Here\u2019s why this metal alloy is different.<\/p>\n
Laser engraving stainless steel removes an important protective layer. In fact, any method that digs markings on the surface (deep or shallow) will remove this layer.<\/p>\n
This thin protective layer is composed of chromium oxide. Chromium oxide is formed naturally when chromium reacts with oxygen. This process is a desired form of oxidation known as passivation. The resulting layer prevents corrosion by stopping oxygen from reaching the underlying steel.<\/p>\n
When that layer is removed, oxygen causes a chemical reaction on the bare steel. That reaction is known as oxidation. The result is rust, which creates weak spots that gradually destroy the material. That’s what happens when you mark stainless steel by laser engraving or laser etching.<\/p>\n
To create marks such as logos or data matrix codes on stainless steel, you need to rely on a technology that does not remove the chromium oxide layer from the surface.<\/p>\n
For such a need, only one technology leaves a permanent mark directly on stainless steel. This technology is laser annealing, and it can be done using a fiber laser machine.<\/p>\n
Laser annealing chemically modifies the steel located under the chromium oxide layer. To do so, the surface is heated until it melts temporarily. During this short time span (milliseconds), oxygen travels below the surface. This creates a desired and controlled form of oxidation under the surface.<\/p>\n