Ernst techn dict.

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Note added at 2003-03-27 10:05:50 (GMT)
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if the pipes are made of metal (rather than thermoplastics)

then

range/region of high-temperature limiting DUCTILITY

Streckgrenze = yield strength
from Tube Association Dictionnary and from a tube manufacturer glossary

As an extension to my comments on the answers above.

Some materials have no yield point. Metals generally do. In fact, they have two, which explains the "-bereich" in the term given.

The explanantion given by the "Materials Science and Technology Dictionary" from Chambers is as follows:

"Yield point: Essentially, the limit of the elastic region of a stress-strain curve where plastic deformation occurs. However, in low-carbon steel and certian other materials the yield point is associated with a sudden drop in the stress and a small plastic extension..."

My comment: The stress registered on the diagram increases until the upper yield point is reached and then there is a sudden drop in stress while the material extends - the stress curve takes a dip down to the lower yield point. Once the sudden extension has occured, the material starts to extend slowly again and the stress and strain rise again smoothly.

I assume that in the inspection report they're going to give a strength range for this term. The alternative is that they are giving a ballpark figure for the yield strength, in which case I'd go for "yield point range".

Yield point and yield strength are interchangeable.

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Note added at 2003-03-27 11:50:12 (GMT)
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Some refs with diagrams:

German:
http://www.neue-arbeit-saar.de/pro_werkst/zugversuch.htm#
http://www.ulrich-rapp.de/stoff/werkstoff/zugversuch/Zugvers...
http://www.mpa.uni-stuttgart.de/LS/Vordiplom/Wkp/01_zugversu... exact explanation in German

English:
http://nsmwww.eng.ohio-state.edu/Stamping_Glossary/html/y.ht...
http://www.ccr.buffalo.edu/etomica/app/modules/sites/Materia...


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Note added at 2003-03-27 11:52:17 (GMT)
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Ductility, by the way, is a whole other kettle of fish...

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Note added at 2003-03-28 07:19:05 (GMT)
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high-temperature OR hot upper and lower yield points OR yield point range.

Generally the temperature will be given if this is for certification, in which case it would be quite correct to write:

upper and lower yield points at XXX°C

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