S235 Steel: Tension/Pressure & Bending Values

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Discussion Overview

The discussion revolves around the interpretation of tension, pressure, and bending values for S235 steel, specifically focusing on the meaning of the numerical values presented in a table format. The scope includes technical clarification and exploratory reasoning regarding material properties and their implications in engineering contexts.

Discussion Character

  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant questions the meaning of the tension/pressure and bending values, which are given as ranges in N/mm².
  • Another participant suggests that the values seem comparable to typical steel properties in MPa, indicating a possible affirmation of their relevance.
  • A different participant identifies S235 as a low carbon structural steel and provides context about its grades and expected yield strength, suggesting that the maximum numbers might represent design stresses.
  • Some participants propose that the 'plus or minus' notation could indicate parameters related to fatigue, although this remains speculative.

Areas of Agreement / Disagreement

Participants express uncertainty about the exact interpretation of the values, with multiple competing views on their meaning and relevance. No consensus is reached regarding the specific implications of the data presented.

Contextual Notes

The discussion highlights the ambiguity in the presentation of the values, particularly regarding their definitions and the context from which they are derived. There is a lack of clarity on whether the numbers represent maximum design stresses or fatigue-related parameters.

TSN79
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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:
0\pm60
130\pm130

Bending:
0\pm190
150\pm150

My question is, what do these values tell me? The values are in N/mm^2
 
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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.
 
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.
 
I'd guess similarly to design stresses or then something more exotic, like allowable stress amplitudes in fatigue.
 
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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