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PRECISION SHAFTSTECHNICAL DATA4. Properties of Alloy ComponentsCARBON [C]:Carbon makes it possible to harden steel. As the carbon proportion increases, the strength and hardeningcapacity of the steel increases, while its elongation, workability, ease of welding, and machinability (usingmilling machines) are reduced. The corrosion resistance to water, acids, and hot gasses is practically notinfluenced by carbon.SILICON [Si]:Silicon is already present in all steel, since the iron ore already contains silicon components according to itscomposition. Silicon steels, however, may only be designated such starting at a silicon content of > 0.40%.Silicon increases the strength and wear resistance (Si-Mn tempered steels); a great increase in the limit ofelasticity, thus it is useful as an alloy component in spring steels. A high silicon contact also positivelyinfluences acid resistance.MANGANESE [Mn]:Manganese increases the hardening capacity of steel. The elongation limit and strength is increased by theMn proportion, and Mn is also favourable for workability and welding capacity, while greatly influencing thehardening depth. Mn steels are highly wear-resistant to impact, while the core remains rigid.MOLYBDENUM [Mo]:Molybdenum improves the hardening capacity and largely reduces the initial brittleness, for instance in Cr-Niand Mn steels, supporting the formation of small grains, and also has a favourable influence on weldingcapability. Increase in the elongation limit, strength, and corrosion resistance. High Mo content reducessusceptibility to pitting.CHROMIUM [Cr]:Chromium makes steel oil- or air-temperable. It increases capacity for hardening and thus the temperability.The notch impact resistance is reduced, but elongation only falls by a little. The welding capacity ofchromium steels falls as the Cr content rises. The tensile strength rises by 80-100 N/mm per 1% Cr. Toobtain corrosion-resistant steels, a minimum content of 13% chromium must be dissolved in the basic mass.MINITEC LINEAR SYSTEM 107

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