Manufacture

Manufacture

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H Roselli manufactures their products in the Finnish village of Harmoinen situated in Kuhmoinen, with a factory outlet, maintenance shop, and warranty services all in one place. All the materials we use in the manufacture are of Finnish origin.

 

Special expertise is required in making the blade to produce high incisiveness and resistance to wear for the cutting blades. Since 2000, H Roselli products have utilised a grade of steel developed by himself - ”UHC (Ultra High Carbon) WOOTZ” steel with top-notch qualities.

 

The present-day UHC steel by H Roselli is a non-alloy, ultra-high carbon steel. Its achievable hardness is 68 HRC. The ultimate tensile strength is 2500N/mm2. Combinations of corresponding hardness have not been previously detected. This steel also has remarkable dynamic ductility. Optical equipment is unable to detect any grain boundaries in the steel, which enables excellent characteristics.

 

In addition to the UHC steel, the grades used in all H Roselli products is of extremely high quality and durable.

 

Blade manufacture starts with ingot bars delivered by the Karhula steel foundry. The Karhula foundry is H Roselli’s partner. Cooperation with the Karhula steel foundry enables applying UHC steel to the numerous other needs of the industry as well.

 

The ingots turn into flat bars that are then cut into half-finished blades. The preform blades are thinned and sharpened, after which they are subjected to multi-phase hardening. Finally, the blades are thinned once again and sharpened by hand using high-precision working methods.

 

Curly birch is mainly used as material for the handles. The curly birch is delivered as deal planks or first-felling logs. They are then dried very carefully according to exacting and well-timed measures and cut into planks of about one metre in length. Next the planks are sawed into suitable individual handle blanks for after-treatment that takes place on a lathe and band sander by hand. This way the handle takes its final shape in hands accustomed to the kind of finesse it requires. The next stage involves heat-treating the handles, if required, to achieve depth of colour. The handles are designed, so that it is easy to get a good and robust grip.

 

Next, a hole is drilled into the handle to attach the blade and the ferrule is installed - now the knife is ready to be assembled into a complete product. Once the knife is complete the handle is finalised to give it its final shape and look. Work stages vary somewhat from one model to another, but everything is done here in Finland. Similar work stages are applied to our kitchen knives and axes too.

 

The sheaths are hand worked from high-quality leather. The best possible type of sheath is designed for each knife according to its intended use. The festive model of ”Iso and pikku Heimo Juhlamalli” has a special tightening band installed in the sheath that holds the knife securely in place. Furthermore, the sheath is designed to tilt freely backwards when you sit down. All our sheaths are made by skilled pairs of hands and have a unique, distinguished look.

 

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