Cast iron 320Х20Н

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  • Cast iron CHN19Kh3SH

    • Designation

    Name The value
    Designation GOST Cyrillic 320Х20Н
    Designation GOST Latin 320X20H
    Transliteration 320H20N
    By chemical elements 320Cr20Н

    Description

    Cast iron 320Х20Н used: for the production of castings of parts operating under conditions of abrasive wear (sand and gravel pumps, hydrocyclones, classifiers, flotation machines, linings of mills, etc.), as well as in aggressive environments or at high temperatures (up to 1000°C).
    When the parts in aggressive environments or at high temperatures should be preferred alloys 250Х25Т and 250Х25НТ with carbon on the bottom and chrome on the upper level.
    Castings must allow for their application in macroclimatic regions with moderate and cold climate indoors (climatic version Y, CL, a resolution category 4 according to GOST 15150).

    Note

    Wear-resistant alloy (cast iron).

    Standards

    Name Code Standards
    Castings with special properties (iron and steel) В83 TU 48-0114-57-90

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Ti
    TU 48-0114-57-90 2.7-3.3 ≤0.05 ≤0.05 0.4-0.8 19-23 0.3-1 1.2-1.5 Rest 0.2-0.4
    Fe is the basis.

    Technological properties

    Name The value
    Particularities of production of goods Smelting can be done in induction and electrical arc furnaces with acid or basic lining. It is recommended that castings be annealed prior to mechanical processing and normalization (hardening in the air) before operating under conditions of abrasive wear. The recommended heat treatment regime: Annealing at 850-950 °C; with normalization 950-1000 °C. the hardness of castings in as-cast is 48-52 HRC after annealing HRC 32-38, after normalization - 60-63 HRC. Profit casting should be done in private legkodelimae, with a supply of metal in the profit and calculate their normals for steel casting.
    Features of heat treatment The heating of the parts under heat treatment is conducted with an initial temperature not more than 200 °C at a speed of 60-70 °C per hour to 600 °C. At this temperature the cage is aged for 1-2 hours, then the heating rate can be increased to 100-150 °C per hour. At the maximum temperature of the heat treatment is aging at the rate of 1 hour for every 25 mm biggest casting thickness. With the normalization, it is recommended to remove items from the cart immediately after rolling it out of the oven, which allows to obtain the highest wear resistance. When annealing is the cooling of the casting with the furnace to 200 to 400 °C.
    Welding defects Corrections of defects by welding. Technology and welding conditions should guarantee the usefulness of fixed casting in their operating conditions. For the welding of working surfaces of parts the following are recommended types of electrodes (GOST 10051): EN-У30Х28С4Н4-50, AL-80Х4СГ, EN-У30Х25РС2Г-60, EN-У30Х23Р2с2ТГ-55. Wear parts castings can be brewed type electrodes EA-2 according to GOST 10052 or close to them in composition.
    Machinability Optimal results when machining castings makes use of tools made of hard alloys brands НК8 and НК6М. The coefficient of machinability after annealing is 2.0.