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tensile strenght @ elevated temperature for EN materials

tensile strenght @ elevated temperature for EN materials

tensile strenght @ elevated temperature for EN materials

(OP)
Dear,

I am trying to make pipespecifications with both ASTM and EN materials according B31.3. I have still one remaining problem. For the EN materials I need tensile strenghts at elevated temperatures. In the EN codes these values are impossible to find. The approaching formule derived from B31.3 (calculating with yield strenght-ratio)is far too conservative. Has any got an idea where I can find reliable tensile strenghts or an approved approach

thanks

RE: tensile strenght @ elevated temperature for EN materials

If your in Canada, and I am assuming you are based on the B31.3 reference, you should refer to ASME Section II - it lists approved materials and strengths at temperatures (B31.3 refers to it but I can't remeber off hand what section it's in).

If your designing within a Canadian juristiction ensure that your calculations follow the code.  to cross reference materials from look into the CASTI Black book.


RE: tensile strenght @ elevated temperature for EN materials

(OP)
InTheField,

My problem is not the materials listed in ASME II because these are all ASTM materials. My problem is calculating allowable stresses for EN/DIN materials according B31.3! B31.3 provides a formula with 4 'parameters': Rm20/3;Rmtemp/3;Ry20/1.5;Rytemp/1.5 Minimum of these values gives de allowable S. Problem is I can't find Rmtemp, tensile @ temperature,for EN materials. So I am looking for reliable EN-material tensile strenght or equations that approach these values.
B31.3 provides a formula: Rmtemp=(Rytemp/Ry20)*Rm20
Problem is this formula is far to conservative and for my appliciation thus unaccptable.

regards

RE: tensile strenght @ elevated temperature for EN materials

What specifications do you need elevated propeties for? In EN10216 Part2 minimum proof stress values are given for elevated temperatures. It's a big table.

RE: tensile strenght @ elevated temperature for EN materials

(OP)
Andy,

I need tensile strenght at elevated temperatures.

RE: tensile strenght @ elevated temperature for EN materials

Yes but specifically which grades of steel?

RE: tensile strenght @ elevated temperature for EN materials

(OP)
I would like them for all materials listed in EN10216-2 :)
But P265GH would be a good start.

RE: tensile strenght @ elevated temperature for EN materials

This isn't relevant to this thread but you might find it useful anyway:

http://www.vanleeuwenbuizen.nl/documents/1_50ug_Pipe_and_Tubes.pdf

This is relevant to your other thread:

http://www.astm.org/BOOKSTORE/PUBS/DS67B_SampleChapter.pdf

For P256GH, and wall thicknesses <= 60 mm, minimum proof stress values Rp0.2 are given in MPa (N/mm2). Temp first then value:

100  226
150  213
200  192
250  171
300  154
350  141
400  134
450  128.

There are 21 grades of steel listed.

RE: tensile strenght @ elevated temperature for EN materials

(OP)
Andy,

Thanks for to effort you put in trying to help me, but I think you misunderstood my question. The values you give me are Rp0.2 values (= yield strenght). I have full access to all EN-codes so also these values.
My problem are tensile strenghts (Rmtemp)! These strenght values seem impossible to find. [In fact it isnt so strange since EN is based on yield strenght and not (as is in ASME) on tensile.]

RE: tensile strenght @ elevated temperature for EN materials

Errr. Yes seems I did. In which case it's going to be difficult to help you. Have you tried contacting steelmakers? The only thing I can suggest.

RE: tensile strenght @ elevated temperature for EN materials

heymans,

What do you think about converting the EN grade to an ASTM equivalent grade, and then using the ASME allowable for that?  I think the only way that you can obtain elevated temperature tensile strength data is from steel tube suppliers in the EU.  I would start by contacting Dalmine/Tenaris.

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