Steel U9A

  • 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 У9А
    Designation GOST Latin U9A
    Transliteration U9A
    By chemical elements 9

    Description

    Steel U9A is used: for the manufacture of tools, working in conditions without heating of cutting edge; the tool for tree processing (milling cutters, countersinks, zekovic, axes, chisels, chisels, longitudinal, and circular saws; rollers, plates and rods for mold molding tin-swinomish alloys; calibers simple form and low accuracy classes; cold-rolled heat-treated ribbon with a thickness of from 2.5 to 0.02 mm, intended for manufacturing of flat and wire springs and spring-loaded parts of complex configuration (valves, styli, reeds, slats dolnych knives structural fine details, including hours, etc. (tape is produced according to GOST 2283, GOST 21996 and a number of special technical conditions); 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 clockwork.

    Standards

    Name Code Standards
    Tape В34 GOST 10234-77, GOST 21996-76, GOST 21997-76, TU 3-939-81, TU 14-1-2993-80
    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 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-505-73, TU 14-11-245-88, TU 14-1-1271-75
    Sheets and strips В33 GOST 4405-75, TU 14-131-971-2001
    Steel wire medium and high carbon В72 GOST 5468-88, GOST 9389-75, GOST 16135-70
    Classification, nomenclature and General rules В20 OST 1 90005-91

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu
    GOST 1435-99 0.85-0.94 ≤0.018 ≤0.025 0.17-0.28 ≤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 2nd group, the mass fraction of Cr ≤ 0.12%, Ni ≤ 0.12%, Cu ≤0.20% and their total mass fraction ≤ 0.40%. 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.
    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.
    For the tape according to TU 14-1-2993-80 produced in accordance with GOST 2283, the deviation in chromium content is allowed up to +0,020%.

    Mechanical properties

    Section, mm σU, MPa d4 d HB, MPa HV, MPa
    Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery)
    - 740-1270 - - - -
    - ≤780 - ≥8 - -
    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
    Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
    - - - - 44-48 -
    Annealed cold-rolled tape of the highest quality
    0.08-3 ≤750 ≥10 - - -
    Cold-rolled steel strip sagatovna (specified strength class)
    0.1-4 750-900 - - - -
    0.1-4 900-1050 - - - -
    0.1-4 1050-1200 - - - -

    Description mechanical marks

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

    Physical characteristics

    Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C
    0 207 79 7745 - - -
    100 - - 7726 49 253 113
    200 - - 7717 48 329 121
    300 - - 7690 46 418 129
    400 - - 7686 43 525 136
    500 - - 7655 40 646 142
    600 - - 7622 37 789 147
    700 - - 7586 33 943 -
    800 - - 7568 - 1155 152
    900 - - 7523 - 1198 -
    1000 - - - - - 14

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    l Coefficient of thermal conductivity
    a The coefficient of linear expansion
    С Specific heat

    Technological properties

    Name The value
    Weldability Does not apply to welded structures.
    Склонность к отпускной хрупкости Tend not.
    The temperature of forging Start - 1125 °C, the end - 750 °C.
    Flock-sensitive sensitivity not sensitive.
    Microstructure The microstructure of the untreated strips with thickness up to 2.2 mm on the other 14-1-2993-80 must meet: lamellar pearlite is not more than 6 points; tsementita mesh - no more than 3 points.
    Particularities of production of goods Rod on the other 14-1-505-73 comes Beloretsky metallurgical plant.