Steel qualities

  1. In a table of different steel qualities the information about a perticular type of steel can be as follows:

    Steel type:
    S235

    Tension/Pressure:
    [tex]0\pm60[/tex]
    [tex]130\pm130[/tex]

    Bending:
    [tex]0\pm190[/tex]
    [tex]150\pm150[/tex]

    My question is, what do these values tell me? The values are in [tex]N/mm^2[/tex]
     
  2. jcsd
  3. Gokul43201

    Gokul43201 11,141
    Staff Emeritus
    Science Advisor
    Gold Member

    While I'm not sure I understand what the numbers themselves represent, the approximate value of the quantities seems to be comparable to typical values for steel in MPa, which is the same as N/mm^2.

    So, my guess is YES.
     
  4. Astronuc

    Staff: Mentor

    What is the format of the table form where these numbers originate?

    S235 is a conventional low carbon structural steel (European Standard EN 10025)

    Grades are:
    S235
    S235JR
    S235J0
    S235J2G3
    S235J2G4

    Yield strength should be about 235 MPa, UTS about 340-470 MPa.

    The maximum numbers may be maximum design stresses, but it is hard to tell. The numbers are given as ranges.
     
  5. PerennialII

    PerennialII 1,102
    Science Advisor
    Gold Member

    I'd guess similarly to design stresses or then something more exotic, like allowable stress amplitudes in fatigue.
     
  6. Gokul43201

    Gokul43201 11,141
    Staff Emeritus
    Science Advisor
    Gold Member

    Yeah, the 'plus or minus' seems to suggest fatigue related parameters.
     
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