Steel U12

  • U16 steel (EI336)
  • U9A steel
  • U9 steel
  • U8GA steel
  • U8G steel
  • U8A steel
  • U8 steel
  • U7A steel
  • U7 steel
  • U12A steel
  • U12 steel
  • U11A steel (U11)
  • U10A steel
  • U10 steel
  • Steel AU10E (ASU10E)
  • A85 steel
  • Steel A75 (U7AB)

    • Designation

    Name The value
    Designation GOST Cyrillic У12
    Designation GOST Latin U12
    Transliteration U12
    By chemical elements 12

    Description

    Steel U12 is used: for the manufacture of hand taps, files, metal scrapers; parts dies of cold forming, trimming and punching of small size and no transitions in the cross section; cold forging punches and dies for small sizes; calibers simple form and low accuracy classes; tools with low wear resistance at moderate and high specific pressure (without heating the cutting edge): nail files, razor blades and knives, sharp surgical tools, scrapers, engraving tools.

    Standards

    Name Code Standards
    Sheets and strips В23 GOST 103-2006
    Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
    Bars and shapes В32 GOST 1435-99, GOST 5210-95, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88, TU 14-1-1271-75
    Sheets and strips В33 GOST 4405-75
    Steel wire medium and high carbon В72 GOST 5468-88, GOST 9389-75

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu
    GOST 1435-99 1.1-1.29 ≤0.028 ≤0.03 0.17-0.33 ≤0.2 0.17-0.33 ≤0.25 Rest ≤0.25
    Fe is the basis.
    According to GOST 1435-99, the mass fraction of chromium, nickel and copper is indicated for 1 group of metal products. The mass fraction of sulfur in steel obtained by the electroslag remelting method should not exceed 0.013%. In the metal products of the third group, the mass fraction of Cr ≤ 0.20-0.40%, Ni ≤ 0.25%, Cu ≤0.25%. In metal products of the 1 st and 3 rd groups, made of steel obtained by scrap-process, the mass fractions of nickel, copper and chromium are increased by 0.05% of each element as compared to those in the table. In a metal designed for the manufacture of cold-rolled strip, an increase in the mass fraction of nickel, copper and chromium is not allowed.

    Mechanical properties

    Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d4 y, % KCU, kJ/m2 HRC
    Annealed cold-rolled tape of the highest quality
    0.08-3 - - ≤750 - ≥10 - - -
    Samples section 21-30 mm. Quenching in water 810-830 °C + Vacation
    - 400 ≥1370 ≥1570 ≥9 - ≥24 ≥200 ≥52
    A sample with a diameter of 5 mm and a length of 25 mm, the deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
    - - - ≥105 ≥60 - ≥68 - -
    Samples section 21-30 mm. Quenching in water 810-830 °C + Vacation
    - 500 ≥880 ≥1040 ≥11 - ≥30 ≥290 ≥40
    Rolled steel. Annealing
    - - ≥325 590-690 ≥28 - ≥50 ≥270 -
    A sample with a diameter of 5 mm and a length of 25 mm, the deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
    - - - ≥100 ≥52 - ≥96 - -
    Samples section 21-30 mm. Quenching in water 810-830 °C + Vacation
    - 600 ≥650 ≥760 ≥18 - ≥52 ≥440 ≥26
    A sample with a diameter of 5 mm and a length of 25 mm, the deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
    - - - ≥60 ≥40 - ≥100 - -
    - - - ≥34 ≥65 - ≥100 - -
    - - - ≥18 ≥74 - ≥100 - -
    - - - ≥15 ≥92 - ≥100 - -
    Rolled steel. Annealing (at 20 °C HB=207)
    - - ≥325 590-690 ≥28 - 45-55 - -
    - - ≥320 ≥570 ≥23 - ≥47 - -
    - - ≥310 ≥450 ≥41 - ≥60 - -
    - - ≥110 ≥140 ≥56 - ≥74 - -
    - - ≥59 ≥76 ≥56 - ≥82 - -
    - - ≥53 ≥72 ≥59 - ≥85 - -
    - - ≥34 ≥40 ≥52 - ≥91 - -
    - - ≥20 ≥28 ≥55 - ≥98 - -

    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
    KCU Toughness
    HRC Rockwell hardness (indenter diamond spheroconical)

    Physical characteristics

    Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
    0 209 82 7830 - - - -
    20 209 - 7830 - - - -
    100 205 80 7809 45 252 105 469
    200 200 78 7781 43 333 118 503
    300 193 75 7749 40 430 126 519
    400 185 72 7713 37 540 134 536
    500 178 69 7675 35 665 141 553
    600 166 63 7634 32 802 148 720
    700 - - 7592 28 964 153 611
    800 - - 7565 24 1152 15 712
    900 - - 7489 25 1196 163 703
    1000 - - - - - 163 703
    1200 - - - - - 168 699

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    G Modulus of elasticity shear torsion
    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. Method of welding - CCC.
    Склонность к отпускной хрупкости tend not
    The temperature of forging Start - 1100 °C, the end - 750 °C. slow Cooling in air.
    Flock-sensitive sensitivity not sensitive
    Machinability In the annealed condition with HB 207 Kn TV.SPL.=1.0 Kn b.St.=0.9
    Sanding behaviour good