Hairline finishing on stainless steel is a polishing method with a long history that appeared in the early days of stainless steel design finishing.
By applying a straight pattern in the longitudinal direction to the No. 2B finish with cold-rolled surface using a perforator or the like, a beautiful texture is added to the silver-skinned stainless steel.
Along with #400 buffing, this is the most popular finish and is used for escalators, store interiors and exteriors, kitchens, furniture, and many other places.
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What is metal hairline polishing?
Hairline polishing is a polishing method that creates an uneven surface with straight lines, giving the appearance of long, straight hair.
The stainless steel manufacturer describes the No. 4 finish as “a finish with continuous abrasive grain lines in one direction, using a belt coated with #150 to #200 mesh abrasive in addition to the No. 4 finish.
Hairline polishing manufacturing method that varies depending on the material used
Materials for hairline polishing are
Stainless steel
Aluminum
Titanium
Copper and brass
These materials are commonly used.
Usually, hairline is formed by scratching the plate surface with paper or non-woven cloth.
Aluminum is a softer material and can become clogged, so oil is also applied to the surface to form a hairline.
Stainless steel and titanium become hot-rolling agents when they are above a certain thickness.
These materials simply cannot be hairlined.
First, the black skin present on the metal surface must be ground off and the surface prepared before hairline is applied.
Features of Hairline Polishing
The first characteristic of hairline polishing is that it is an elegant finish.
It has a metallic luster from a distance and less reflection compared to buff polishing process, which expresses the beauty of the metal.
In addition, this finish can be applied not only to plate shapes but also to angles, channels, H steel, round pipes, each pipes, and flat bars.
Since this hairline finish has a very long history, we have a full lineup of various hand tools. It is also relatively easy to modify the welding area in the can welding process and design process.
Therefore, hairline finish is used in various applications such as furniture, escalators, elevators, sashes, interior and exterior wall surfaces, store fixtures, and fittings.
Variation of hairline polishing
Hairline polishing changes its grain depth and appearance by changing the polishing grit size.
In the case of hairline polishing in the grinding method, changes in the polishing grain can be expressed by changing the number of revolutions and feed speed.
The appearance of hairline polishing can also change depending on the material used.
Stainless steel SUS304 Hairline polished plate material
Aluminum A1100 Hairline polished plate
It is hard to tell when viewed alone, but a side-by-side comparison will give you an idea of the atmosphere.
Aluminum A1100 Hairline polished plate ｜ Stainless steel SUS304 Hairline polished plate
Disadvantages of hairline polishing
Hairline polished products have a long history and have been used in many places, but the problems are “hand marks” and “scratches.
Hairline polishing has a one-directional polishing line.
Therefore, scratches that intersect with the hairline line are very noticeable.
Hand scratches are also difficult to wipe off.
Another disadvantage is that in outdoor salt-affected areas, it is more prone to rust than buffed or mirror-polished surfaces.
Therefore, we recommend glass coating to improve this situation as much as possible.
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Summary of hairline polishing of metals (stainless steel and aluminum)
Although people tend to think they know about hairline polishing because it is so popular in the world, when we summarize it again, it seems that its features and disadvantages have not yet been communicated to the public.
Stainless steel from now on. We will continue to introduce the attractiveness of metals such as titanium and aluminum, so please visit our website again.
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