Steel qualities

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  • #1
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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]
 

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  • #2
Gokul43201
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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.
 
  • #3
Astronuc
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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.
 
  • #4
PerennialII
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I'd guess similarly to design stresses or then something more exotic, like allowable stress amplitudes in fatigue.
 
  • #5
Gokul43201
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PerennialII said:
I'd guess similarly to design stresses or then something more exotic, like allowable stress amplitudes in fatigue.

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

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