High-carbon steel

High carbon steel - This is a steel that contains an increased amount of carbon, from 0.6% to 2%. During the production process, to impart certain mechanical properties high-carbon steel  undergoes heat treatment. This can cause small cracks in the welds where the alloy was exposed to high temperatures, which in turn interferes with proper welding of the steel.

To prevent this phenomenon and increase welding productivity, as well as to eliminate the appearance of hardened zones, preheating of the workpiece to 200-250 is used.⁰C. After this, the alloy welds perfectly and creates reliable connections. High-carbon steel  in most cases it is not used for structures.

High-carbon steel and its grades

High-carbon steel grade  It is designated by the letter U (carbon tool steel), followed by a number indicating the percentage of carbon. For example, U7 contains 0.65-0.74% of carbon, U13 has a carbon content of 1.25-1.35%. The special properties of tool steel are influenced by the presence of manganese; the letter G will be following the number. For example, sheet 65G. High-carbon steel grade  From U7 to U13, the silicon content is 0.15-0.35%, sulfur 0.030%. Grades U10A and U12A are used for matrix production, but require subsequent hardening. U8 and U10 are used to make small, low-duty magnets.

High-carbon steel grades  Steel grades 55, 60, and 70 are characterized by very good hardness and strength, making them suitable for the manufacture of cable wire, rods, rolling mill shafts, and other components subject to heavy loads during operation. High-quality carbon structural steel grades 15, 35, 45, and 50 are used for parts subject to subsequent case hardening to increase the hardness and wear resistance of components such as shafts, gears, axles, nuts, bolts, couplings, and various friction-sensitive parts. High-quality steel is also indicated by the letter A after the letters and numbers, and high-quality steels are designated as Ш. Grades ШХ4, ШХ15, and ШХ15СГ, which contain chromium as an alloying additive, are used for bearings.

High carbon steel properties

High carbon steel properties  As carbon increases, cementite increases, while ferrite decreases. This results in the metal acquiring a less ductile structure and impact toughness, but maintaining strength and hardness. high-carbon steel properties  The quality of the steel depends largely on the content of harmful impurities; the lower the content, the higher the quality. The presence of manganese increases the hardenability of the steel and significantly increases its strength. Manganese also counteracts the harmful effects of sulfur, which, when present in large quantities, leads to cracks during forging. High carbon steel properties  They belong to a class of steels that are difficult to weld, so they are not used in welded structures, and welding is used only for repair work or surfacing. Thus, high-carbon steel properties allow it to be used for the production of high-strength tools, measuring instruments, and everything else listed above.