Steel 70

  • 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 70
    Designation GOST Latin 70
    Transliteration 70
    By chemical elements 70

    Description

    Steel 70 used: for the production of springs, springs and other parts which require higher strength and elastic properties and wear resistance; wire square, rectangular and trapezoidal cross-sections designed for the manufacture of spring washers; blades of earth-moving machinery (bulldozers, scrapers, graders and graders, as well as to the dozer and grader blades equipment excavators, rollers and other earth moving machines); 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; hardened and tempered wire carded round and shaped steel used in the manufacture of brackets needle products; wire square, rectangular and trapezoidal cross-sections designed for the manufacture of spring washers; tinned wire for the manufacture of tires rotors of electric machines.

    Note

    Steel spring carbon.

    Standards

    Name Code Standards
    Bars and shapes В22 GOST 1133-71, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 9234-74, GOST 11474-76, GOST 17152-89, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
    Fittings, components and parts for railway rolling stock Д55 GOST 11530-93
    Sheets and strips В33 GOST 1577-93, GOST 4405-75, TU 14-1-417-72, TU 14-1-4516-88, TU 14-1-634-73
    Tape В34 GOST 2284-79, GOST 21996-76, GOST 21997-76, TU 14-4-101-87, TU 4-14-100-84, TU 14-1-3656-83, TU 14-4-100-84, TU 14-4-149-72
    Low carbon steel wire В71 GOST 3875-83
    Steel wire medium and high carbon В72 GOST 7348-81, GOST 9124-85, GOST 9389-75, GOST 11850-72, GOST 26366-84, TU 14-178-110-89, TU 14-4-777-76, TU 14-171-35-89
    Bars and shapes В32 GOST 7417-75, GOST 7419-90, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 14959-79, TU 14-1-2118-77, TU 14-1-666-73, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
    Sheets and strips В23 GOST 82-70, GOST 19903-74, GOST 19903-90

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu
    GOST 17152-89 (ИСО 7129-82 0.67-0.75 ≤0.035 ≤0.035 0.5-0.8 ≤0.25 0.17-0.37 ≤0.25 Rest ≤0.2
    GOST 14959-79 0.67-0.75 ≤0.035 ≤0.035 0.5-0.8 ≤0.25 0.17-0.37 ≤0.25 Rest ≤0.2
    Fe is the basis.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % d4 y, % HB, MPa HV, MPa
    Cold-rolled steel strip of 0.1-4.0 mm in the delivery state according to GOST 2284-79
    - - 440-740 - ≥10 - - -
    - - 440-640 - ≥10 - - -
    - - 740-1130 - - - - -
    Rolled steel. Normalization
    ≤80 ≥510 ≥910 ≥17 - ≥29 ≥252 -
    Carden wire 0.2-0.8 mm as supplied by GOST 3875-83 (samples)
    - - 1960-2160 - - - - -
    - - 2161-2350 - - - - -
    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
    Wire square, rectangular and trapezoidal cross sections according to GOST 11850-72
    0.6-12 - 590-780 - - - - -
    0.6-12 - 490-780 - - - - -
    0.6-3 - ≤1130 - - - - -
    0.6-3 - ≤980 - - - - -
    0.6-3 - ≤1230 - - - - -
    Wire. Quenching in oil from 920 °C (tмасла=40 °C, exposure for 1 min) + off if you have 500 °With (extract 15 min), air cooling
    ≤6.5 - ≥1240 ≥7 - ≥47 ≥315 -
    Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Hardened in oil from 830 °C to + vacation at 470 °C
    ≥835 ≥1030 ≥9 - ≥30 - -

    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
    d4 Elongation after rupture
    y The relative narrowing
    HB Brinell hardness number
    HV The Vickers hardness

    Physical characteristics

    Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
    0 206 78 7810 - - -
    20 206 - 7810 - - -
    100 - - - 68 115 483
    200 - - - 52 123 483
    300 - - - 37 13 -
    400 - - - 29 13 487
    600 - - - - 138 521
    800 - - - - - 567

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    r Density
    l Coefficient of thermal conductivity
    R UD. the resistivity
    a The coefficient of linear expansion

    Technological properties

    Name The value
    Weldability Does not apply to welded structures. The CCC followed by heat treatment.
    Склонность к отпускной хрупкости Tend not.
    The temperature of forging Start - 1200 °C, the end - 850 °C.
    Flock-sensitive sensitivity Insensitive.
    Machinability When NV 183-241 Kn TV.SPL.=0,7 Kn b.St.=0,6.