Steel 30KH13N7S2 (ЭИ72)

  • Steel 10Х13СУ (ЭИ404)
  • Steel 15Kh18SU (EI484)
  • Steel 15Kh6Su (EI428)
  • Steel 20X23H13 (EI319)
  • Steel 20Х25Н20С2 (ЭИ283)
  • Steel 30Х13Н7С2 (ЭИ72)
  • Steel 36Х18Н25С2 (4Х18Н25С2)

    • Designation

    Name The value
    Designation GOST Cyrillic 30Х13Н7С2
    Designation GOST Latin 30X13H7C2
    Transliteration 30H13N7S2
    By chemical elements 30Cr13Н7С2
    Name The value
    Designation GOST Cyrillic ЭИ72
    Designation GOST Latin EI72
    Transliteration EhI72
    By chemical elements -

    Description

    30KH13N7S2 steel is used: for the production of valves of automobile engines; for the production of various high temperature parts of aviation.

    Note

    Steel heat-resistant martensitic class.
    Temperature intense scaling in air +950 °C.
    Stable in sulfur-containing environments.

    Standards

    Name Code Standards
    Classification, nomenclature and General rules В30 GOST 5632-72
    Bars and shapes В32 GOST 5949-75, TU 14-1-377-72, TU 14-1-3957-85, TU 14-11-245-88
    Blanks. Of the workpiece. Slabs В21 OST 1 90176-75
    Blanks. Of the workpiece. Slabs В31 OST 3-1686-90

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
    GOST 5632-72 0.25-0.34 ≤0.025 ≤0.03 ≤0.8 12-14 2-3 6-7.5 Rest ≤0.3 ≤0.2 ≤0.2 ≤0.3 ≤0.2
    Fe is the basis.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
    Bars hot rolled and forged GOST 5949-75 and Forming at OST 1 90176-75. Quenching in water from 1040-1060 °C + Annealing at 860-880 °C (exposure 6 h), cooled to 700 °C for 2 hours, then - with oven + Normalization at 660-680 °C (aging of 0.5 h), air cooling + Tempering in oil 790-810 °C
    ≥785 ≥1177 ≥10 ≥25 ≥196 341-401

    Description mechanical marks

    Name Description
    sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
    σU Limit short-term strength
    d5 Elongation after rupture
    y The relative narrowing
    KCU Toughness
    HB Brinell hardness number