What is HV500 Coat?

The iron inner barrels in the "Guren" series produced by da Vinci are coated with the "HV500 Coat." The "HV500 Coat" is a special coating specified by da Vinci. Its benefits include rust prevention, improved surface hardness, and maintaining a beautiful surface. We will explain these in more detail.

■Rust prevention effect <br>The surface of iron is in a very unstable state, and it becomes stable when it oxidizes. This oxidation is what is known as "rust." When rust occurs, the surface becomes rough and affects the inner diameter precision, which can lead to concerns about clogging and a deterioration in accuracy.
The solution to these problems is "coating" and "dyeing."
In the industry, when people say "dyeing," they think of "black dyeing." The black color looks cool, but "dyeing" does not solve the rust problem. It will still rust.
That's why da Vinci has adopted a coating called "HV500 Coat." This has resulted in a rust-free barrel that will never rust and will remain beautiful.

■The surface hardness of the "HV500 Coat" far exceeds that of stainless steel . As the name suggests, the surface hardness exceeds "Vickers hardness 500". For reference: Brass 80~150
・Iron (S45C) 200~250
・Stainless steel (SUS304) 190
As you know, brass is soft. It dents easily when it hits something. This is also reflected in the hardness of the surface.
The HV500 coating achieves a hardness equivalent to 500, far exceeding that of the original steel, resulting in a strong barrel that is resistant to deformation.
*This is only the hardness of the layer that forms on the surface. The material itself does not change.

■The secret to accuracy lies in beauty
The beauty of the surface provided by the HV500 coating is also a major point.
This coating is thin, evenly laid down and produces a beautiful surface.
Even if dirt gets on it, it can be wiped off immediately, just like a coated car body. Since creating a clean flow in a barrel is the shortcut to accuracy, we have been experimenting with coatings for many years in search of a beautiful surface, and finally, the HV500 Coat has answered our desire.

You may not be familiar with this coating, but da Vinci is proud to offer the "HV500 Coat," so please come and see it for yourself.