Allowable stress for DIN 1.0565 P355NH and B31.3 2016 for flexibility study

[soletto]

Hallo guys,

i have a code issue problem and would need your help.

This material has a ultimate tensile strength of 490 [MPa] @ 20°C and a yield strength of 355 [MPa] @ 20°C.

Now for the allowable stress according B31.3 2016 does chapter 302.3.2 (d)(1),(2) apply or 302.3.2 (f)?

What is the correct allowable stress:

We use: 0,92 * [max [(490/3),(355/1,5)]] = 150 MPa for sutructural grade materials = 490*0,92/3

or is it only 355/1,5 = 237 MPa

In my opinion 302.3.2 (d)(1),(2) does apply with tensile strength allowable

Thank you and best regards, Stefan

 

[XL83NL]

302.3.2(f), since 302.3.2(a)÷(e) provide the basis for 'Code materials', such as the allowable stresses found in table A-1(M).

 

[soletto]

302.3.2 (f) does not provide information how to calculate allowable stress.

Can anyone help me out ?

What is the correct value out of my 2 calculations
Thank you, br Stefan

 

[XL83NL]

You asked

Now for the allowable stress according B31.3 2016 does chapter 302.3.2 (d)(1),(2) apply or 302.3.2 (f)?

So I said 302.3.2(f), since P355NH is not listed in B31.3, therefore its called unlisted. Para 302.3.2 (f) provides the basis for how allowable stresses need to be calculated for unlisted materials, therefore 302.3.2(d)(1) does not apply.
Then you say

302.3.2 (f) does not provide information how to calculate allowable stress.

Why did you ask in the first place?

Tell me where P355NH is found in table A-1 and Ill reconsider my answer.

Furthermore, you mentioned

for sutructural grade materials

Any EN-material with a P-designation in front is not a structural grade material. The P is pressure parts, such as piping and pressure vessels.