The Marttiini blade’s production process is a demanding and time consuming one. First a steel bar is rolled into a steel band. In the rolling process the steel molecules change shape from round to oval. This process increases steel density and makes it tough. In the rolling phase for the filleting knife the molecular structure of the wedge shaped steel band becomes denser toward the cutting edge. This makes the blade flexible and resilient. The rolled steel bands are cut into blade blanks that are then tempered. Those blank blades are supplied to Marttiini by reputable French and German factories that are specialised in blade manufacturing.
The foundation of a Marttiini knife’s sharpness is the honing angle achieved with a sharpening stone. At the Rovaniemi factory the blade blank goes through several production phases before it is ready for the last and most important production phase. This phase, which requires special professional skills, the blade is honed by hand to give the products the famous Marttiini sharpness.
STAINLESS CHROME STEEL
The stainless steel used by Marttiini is an easy-to-treat blade material that maintains its sharpness for a long time. The proportion of chrome in the steel blend is 13% and the hardness is 53-54 on the Rockwell scale (HRC). We recommend the diamond sharpener for chrome steel, see page 37.
A blade made of carbon steel is especially suitable for carving and it is easy to hone it to its original sharpness. With a carbon steel blade, it is important to dry it immediately after use. It would also be a good idea to treat it regularly with unsalted oil, eg. cooking oil. A regularly treated carbon steel blade remains stainless and has an especially long working life.
Carbinox T508 steel combines the best characteristics of carbon and chrome steel: toughness, honing easiness, and extreme durability. The steel blend carbon content is 0.5%, chrome content 8% and its hardness 56-57 HRC. The material is not classified as stainless but its resistance to corrosion is considerably higher than that of traditional carbon steel. In the maintenance of Carbinox T508 it is sufficient to clean the blade carefully and dry it after use. However we also recommend the occasional treatment of the blade with unsalted oil.
Dirt and water-repellent Martef coating reduces friction to almost zero and at the same time protects the blade from corrosion. Due to this coating the blade moves especially smoothly in cut material and cleaning the blade after use is very easy.
CURLY BIRCH & BIRCH
Several wooden handle knives have metallic ferrules. The raw material used is either brass, German silver, cast bronze or stainless steel. The characteristics of brass, German silver and bronze include patinisation over time. Patinised ferrules may be polished with an ordinary metal cleaning agent.
The purpose of the stealth is to protect the knife and the user when the knife is not in use. A knife may be attached to a belt with a stealth’s fastening strap. A separate stealth is designed for every single knife. The stealth’s small details are decorated but often they also have other practical meanings. For example the rectangular piece of leather at the tip of several stealths prevents a belted stealth from moving like a pendulum.
Leather stealths of Marttiini knives are made of plant or chrome tanned leather. Leather is mostly acquired from Europe. Stealths are made of natural and painted leather.
Knife stealths are still mostly made by hand. Each stealth must be exactly the designed size and appearance so that it forms a perfect couple with the knife. A template iron is used to cut a blank from leather and before sewing the edges are glued together. Several stealths have a plastic sleeve inside that prevents the blade from penetrating the stealth.
Stealth impressions are made either on the stealth blank or the finished stealth. The stealth’s surface finishing may also include varnish that increases its dash and protects the stealth from dirt and moisture. The rivets and possible bronze bands reinforce and decorate the stealth.
Cordura is an especially durable certified nylon fabric produced by DuPont. It is stab and tear resistant, fast drying, easy to care for and light.
A durable and hygienic plastic stealth is practical with knives that are used under damp and dirty conditions.
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