Laser marking on stainless steel has become a leading technique for customizing and engraving parts with precision, durability, and high quality. At COUTH, we show you how this advanced technology allows you to obtain clear and resistant results, ideal for industrial and identification applications.
Discover the advantages of laser marking and why it is the preferred option for working with stainless steel, guaranteeing flawless finishes.
What is stainless steel marking?
If you are wondering what stainless steel marking is, you should know that it is a process by which text, numbers, logos, codes, or designs are permanently marked on the surface of stainless steel. This procedure is used to identify parts and products, ensuring high resistance to wear, corrosion, and environmental conditions.
There are various laser marking solutions that can be adapted to the needs of each application and type of material. Although they all use a concentrated beam of light to modify the surface of the stainless steel, they differ in wavelength, power, and the way they interact with the material.
The main technologies are:
- Fiber Laser: This is the most widely used option for marking stainless steel due to its high precision, speed, and durability. The light beam is transmitted through an optical fiber, providing excellent beam quality and a very long service life. It allows for deep engraving, high-contrast marking, or even coloring of the steel through controlled modification of the oxide layer.
- CO₂ laser: Although mainly used on organic materials or plastics, it can also be used on coated steels or in applications where surface marking is required. Its wavelength is less absorbed by metal, so it requires higher power.
- Nd:YAG or Nd:YVO₄ laser: This type of laser source offers high energy density in short pulses, ideal for fine marking or micro-engraving on metal components. It is a good option when high definition is required in very small or hard-to-reach areas.
- Picosecond and femtosecond lasers: These ultra-fast technologies allow marking without generating residual heat (“cold” process), avoiding deformation or alteration of the material. They are especially useful in sectors where maximum precision and an impeccable aesthetic finish are required, such as the medical or electronics industries.
Laser marking systems on stainless steel
As we have mentioned, laser marking on stainless steel is carried out using different types of systems, each with specific characteristics that are adapted to different applications and needs.
However, in this section we will detail the main laser marking system used on stainless steel:
1. Fiber laser
Fiber laser is an advanced technology used for marking stainless steel. It uses a high-power laser beam, generated and transmitted through fiber optic cables, which makes it very efficient, compact, and stable.
Main applications
- Marking and engraving: The fiber laser can permanently mark stainless steel, creating wear- and corrosion-resistant marks. High-speed, high-precision engraving is possible, ideal for industrial applications, part identification, serial numbers, logos, QR codes, etc.
- Color marking: With MOPA fiber lasers, parameters such as pulse width can be adjusted to create color effects through controlled oxidation. This allows for shades such as blue, yellow, green, and even rainbow effects on stainless steel. This process does not alter the structure of the material, as the mark is produced only by surface heating.
Advantages of fiber lasers on stainless steel
- High precision and energy efficiency: It allows for very detailed markings with low energy consumption.
- Indelible and resistant markings: The markings are permanent and withstand wear and corrosion.
- Greater absorption and contrast: Stainless steel better absorbs the wavelength of the fiber laser, producing darker and more visible markings.
- Versatility: It can work on different types and thicknesses of stainless steel, as well as other metals.
Among the laser marking systems for stainless steel, the fiber laser definitely stands out, as it offers high precision, power, and the possibility of obtaining dark or colored marks without damaging the material.
Other types of marking on stainless steel
In addition to laser marking solutions on stainless steel, there are other methods such as:
Micro-percussion marking
Micro-percussion marking is an industrial technique that uses a carbide or diamond tip that vibrates or rapidly strikes the surface of the stainless steel, generating a series of controlled micro-impacts that form characters, codes, logos, or any other required design.
How does the process work?
- Mechanism: An electronically controlled punch makes small impacts on the surface of the stainless steel, moving according to the programmed design.
- Result: Each impact creates a small indentation, and the sum of these points generates the desired marking, similar to a dot matrix printer, but on metal.
- Depth and visibility: The marking can be shallow or deep, depending on the machine parameters and the hardness of the material.
Advantages of micro-percussion marking on stainless steel
- Permanent and resistant: The marking is indelible and withstands extreme conditions, ideal for industrial traceability.
- Does not alter material properties: It does not generate significant heat or affect the structure of the stainless steel.
- Versatility: It can mark text, logos, Data Matrix codes, serial numbers, etc., on parts of different shapes and sizes.
- Applicable to hard materials: It is suitable for stainless steel, hardened steel, titanium, bronze, and other metals.
Typical applications
- Traceability of industrial and automotive parts.
- Marking of surgical instruments and medical devices.
- Identification of tools and mechanical components.
Scratch marking
Scratch marking on stainless steel is a process that involves creating lines or grooves on the surface of the part using a tool that lightly scratches the metal surface. This method is used to identify or customize stainless steel parts.
Characteristics of scratch marking
- Superficial: Scratching does not usually penetrate deeply into stainless steel, but rather creates a visible alteration in the surface layer.
- Visual and tactile: The marking is visible to the eye and can be felt to the touch, as it creates a linear texture or relief.
- Does not significantly alter the structure of the steel: Although it leaves visible marks, it does not compromise the integrity of the material.
Uses and applications
- Identification and traceability: For marking serial numbers, codes, or symbols on industrial parts.
- Personalization: Custom engravings on stainless steel objects.
If you are looking for efficient laser marking solutions on stainless steel, at COUTH we have the best machines with advanced technology that adapt to the needs of each industrial sector. Contact us.