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What you should know about steel before buying hand tools

On the packaging of hand tools, abbreviations are very often placed: CrV, CrNI, Cr-Mo or the short description "tool steel". These descriptions inform the consumer about the type of steel from which the product was made. Before purchasing tools, it is worth paying attention to these markings and familiarizing yourself with their meaning. To properly interpret the above abbreviations, one should be aware that steel classification is carried out according to various criteria. One of these is the chemical composition, where a distinction is made between alloy steels and non-alloy (carbon) steels. Alloy steel – an alloy of iron with carbon and deliberately introduced alloying elements. These additives occur in varying amounts – from trace values up to several tens of percent. As components they are very important because they significantly influence and change the properties of the steel. The most common alloying elements are: molybdenum, vanadium, aluminum, tungsten, nickel, chromium, manganese, silicon, titanium, niobium and cobalt. To increase strength and reduce brittleness, the following are used in the production of hand tools:
  • chromium-vanadium steel (CrV) – characterized by increased resistance to corrosion and rust formation. The alloying addition "chromium" significantly improves the steel's hardenability. The alloying addition "vanadium" increases the steel's ductility during heat treatment, which positively affects resistance to high temperatures and resistance to deformation.
  • chromium-nickel steel (CrNI) – characterized by very high resistance to corrosive agents such as seawater or sulfuric acid. In addition to acid resistance, this steel is distinguished by heat resistance and high-temperature strength.
  • chromium-molybdenum steel (Cr-Mo) – decidedly the lightest, which means that products made from this steel are more durable while having a lower own weight. The alloying addition "molybdenum" increases the ductility of the steel at high temperature and prevents deformation. It also increases the overall corrosion resistance of the steel in humid and acidic environments.
Non-alloy (carbon) steel – an alloy of iron with carbon that does not contain specially introduced elements. The content of elements other than carbon is small – they are admixtures and impurities. Due to costs, their removal is not economical. It is the percentage of carbon and the heat treatment of the alloy that affect the properties and characteristics of non-alloy steel. Essentially, non-alloy steel is used for the production of components with simple construction and those that require high tensile strength (e.g. pressure vessels). Some hand tools are made from non-alloy tool steel with a carbon content in the range of 0.6–1.5%. The working surface of such tools is hard, and the steel hardens well.
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