Steel 70S2KHA (ЭИ142)

  • 70G steel
  • Steel 60S2HFA
  • Steel 60KhFA (60KhF)
  • Steel 65
  • Steel 65G (65G1)
  • Steel 65GA
  • Steel 65S2VA
  • Steel 68A
  • Steel 68GA
  • Steel 70
  • Steel 60S2HG
  • Steel 70G2
  • Steel 70S2HA (EI142)
  • Steel 70C3A
  • 70KhGFA steel
  • Steel 75
  • Steel 80
  • Steel 85
  • KT-2 steel
  • KT-3 steel
  • Steel 55S2A
  • Steel 3K-7
  • Steel 40P
  • Steel 50RA (50P)
  • 50KhG steel
  • 50KhGA steel
  • 50KhGFA steel
  • Steel 50KhFA (50KhF)
  • 51KhFA steel
  • Steel 55C2
  • Steel 60С2Х (60С2ХА; 60С2ХАA)
  • Steel 55S2GF
  • Steel 55KhGR
  • Steel 55KhFA (55KhF)
  • 60G steel
  • Steel 60C2
  • Steel 60S2A
  • Steel 60S2G
  • Steel 60C2H2A

    • Designation

    Name The value
    Designation GOST Cyrillic 70С2ХА
    Designation GOST Latin 70C2XA
    Transliteration 70S2HA
    By chemical elements 70С2Cr
    Name The value
    Designation GOST Cyrillic ЭИ142
    Designation GOST Latin EI142
    Transliteration EhI142
    By chemical elements -

    Description

    70S2KHA steel is used: for the manufacture of springs for watches; large springs for critical applications; cold-rolled heat-treated ribbon with a thickness of 0.05 to 1.30 mm and rolled heat-treated strip thickness 0.15−2.00 mm for the manufacture of spring details and springs, with the exception of the crown; measuring tapes.

    Note

    Steel spring alloy of high quality.

    Standards

    Name Code Standards
    Bars and shapes В32 GOST 14959-79, TU 14-1-2118-77, TU 14-1-505-73, TU 14-11-245-88, TU 14-136-367-2008
    Tape В34 GOST 2283-79, GOST 21996-76, GOST 21997-76, TU 3-939-81, TU 14-1-2992-80
    Steel wire medium and high carbon В72 GOST 26366-84

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu
    GOST 14959-79 0.65-0.75 ≤0.025 ≤0.025 0.4-0.6 0.2-0.4 1.4-1.7 ≤0.25 Rest ≤0.2
    Fe is the basis.
    According to TU 14-1-505-73, by agreement of the parties for special purpose hardware, steel should be supplied with reduced content limits of elements without treatment with synthetic slag and purging with argon.

    Mechanical properties

    Section, mm σU, MPa d4 HV, MPa
    Tape cold-rolled heat-treated (0,05-1,30 mm) for spring parts and springs according to GOST 21996-76 and flattened strip (0,15-2,00 mm) according to GOST 21997-76 (listed group strength tape)
    - 1270-1570 - 375-485
    - 1580-1860 - 486-600
    - ≥1860 - ≥600
    Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
    0.1-4 780-1180 - -
    0.1-4 ≤880 ≥8 -

    Description mechanical marks

    Name Description
    σU Limit short-term strength
    d4 Elongation after rupture
    HV The Vickers hardness

    Technological properties

    Name The value
    Weldability Does not apply to welded structures.
    Склонность к отпускной хрупкости Tend not.
    Flock-sensitive sensitivity not sensitive.
    Particularities of production of goods Rod on the other 14-1-505-73 comes Beloretsky metallurgical plant.