Zhytomyr sheet, circle tool steel U8A, HVG, 9XC, 5HNM, R6M5, spring-loaded 65G

Tool steel is a cast alloy, the distinctive properties of which are increased strength, hardness, wear resistance and hardenability.
Tool steel grades
There are three subspecies of steels of this group:
    carbonaceous;
    alloyed;
    fast cutting.
Tool steel from factories Carbon alloys are called alloys that contain at least 7% carbon. In accordance with GOST 1435-99, carbon special steels of the following grades are produced: U7, U7A, U8, U8A, U8G, U8GA, U9, U9A, U10, U10A, U11, U11A, U12 and U12A The letter "U" indicates that the alloy is carbonaceous, the number behind it indicates the carbon content. The letter "G" indicates a high content of manganese in the metal, and the letter "A" marks high-quality steels in which the content of phosphorus and sulfur is lower than in alloys of ordinary quality.
Alloys in which certain elements (silicon, tungsten, chromium, manganese, vanadium, etc.) are added to improve properties are called alloyed. At the beginning of the name of the alloy grade there is a number indicating the carbon content in it, followed by letters indicating the alloying elements and numbers indicating the percentage of the substance. High-speed tool steels are marked with letters that correspond to the alloying and carbide-forming element. The letter is followed by a number indicating the percentage of the element. At the beginning of the brand name put a number, which indicates the content of carbon in the alloy. Tool steel is one of the steel grades with high hardness, strength and wear resistance. Thanks to these qualities, it has found its application in the production of tools for working metal and wood, stamps and parts that are subject to constant loads.
Regarding its purpose, tool steel is classified as follows: for the measuring tool - carbon and low-alloy;
    for cutting tools - high-speed;
    for cold deformation - stamped ledeburite and hypereutectoid class;
    for hot deformation - eutectoid, hypoeutectoid and hypereutectoid class.
Carbon steel
This material is used for the production of stamping, measuring and cutting tools that are not exposed to more than 200C0 during operation. Carbon steel is characterized by high surface hardness and internal toughness. This provides: Excellent mechanical properties of the tool and its minimum leash.
    Low hardness, which allows the use of such high-performance knurling and knurling manufacturing methods.
    The use of hardening at low temperatures.
    Obtaining a minimum amount of residual austenite, which provides the tool with resistance to deformation.
    Low tool cost. Carbon steel has low heat resistance, which significantly limits its scope.
Alloy steel
Tool alloy steel has a number of advantages over carbon steel:
    high piercing;
    no tendency to overheat;
    high wear resistance;
    impact strength.
Due to these qualities, the scope of its use is much wider.