Steel S255

  • C375 steel
  • C590K steel
  • C590 steel
  • C440D steel
  • C440 steel
  • C390K steel
  • C390D steel
  • C390 steel
  • C375D steel
  • C345K steel
  • C345D steel
  • C345 steel
  • C285 steel
  • C275 steel
  • C255 steel
  • C245 steel
  • C235 steel

    • Designation

    Name The value
    Designation GOST Cyrillic С255
    Designation GOST Latin C255
    Transliteration S255
    By chemical elements -

    Description

    Steel S255 used: for the manufacture of hot-rolled structural shapes (angles, I-beams, channels), sheet, universal broadband rental and roll-formed profiles designed for construction of steel structures with welded and other connections.

    Standards

    Name Code Standards
    Classification, nomenclature and General rules В20 GOST 27772-88

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu N As
    GOST 27772-88 ≤0.22 ≤0.05 ≤0.04 ≤0.65 ≤0.3 0.15-0.3 ≤0.3 Rest ≤0.3 ≤0.008 ≤0.008
    Fe is the basis.
    According to GOST 27772-88 for steel smelted in electric furnaces, the content of N ≤ 0.012% is allowed. In steel, an increase in the mass fraction of manganese to 0.085% is permissible. It is allowed to change the chemical composition at the manufacturer's choice: the Mn content is 0.80-1.10%, while the Si content is 0.05-0.15%; the C content ≤ 0.20% and Mn = 0.80-1.10, with a Si content of 0.15-0.30%. The mass fraction of residual (acid-soluble) aluminum in C255 steel with a manganese content of up to 0.85% and silicon of 0.15-0.30%, intended for sheet and broadband universal rolled products, should be at least 0.020%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % KCU, kJ/m2
    Sheet metal in delivery condition
    2-3.9 ≥255 ≥380 ≥20 -
    4-10 ≥245 ≥380 ≥25 ≥294
    Structural steel in delivery condition (KCU-20 °C or after mechanical aging)
    10-20 ≥245 ≥370 ≥25 ≥294
    20-40 ≥235 ≥370 ≥24 ≥294
    4-10 ≥255 ≥380 ≥25 ≥294
    Universal broadband rental in the state of delivery (KCU-20 °C or after mechanical aging)
    10-20 ≥245 ≥370 ≥25 ≥294
    20-40 ≥235 ≥370 ≥25 ≥294

    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
    KCU Toughness

    Technological properties

    Name The value
    Weldability without restrictions