Steel qualities

1. Jan 25, 2005

TSN79

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 $$N/mm^2$$

2. Jan 25, 2005

Gokul43201

Staff Emeritus
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. Jan 25, 2005

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)

S235
S235JR
S235J0
S235J2G3
S235J2G4

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

4. Jan 28, 2005

PerennialII

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

5. Jan 29, 2005

Gokul43201

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