Glossary entry

German term or phrase:

ruhender Luft abgekühlt

English translation:

allowed to cool in still air

Added to glossary by David Moore (X)
Mar 31, 2003 11:12
21 yrs ago
German term

ruhender Luft abgekühlt

German to English Tech/Engineering Metallurgy / Casting
Nach Erreichen der vorgegebenen Anlaßzeit wird das Bauteil aus dem Ofen entnommen und an ruhender Luft abgekühlt.
Change log

Feb 15, 2016 15:49: Steffen Walter changed "Field (specific)" from "(none)" to "Engineering: Industrial"

Feb 15, 2016 15:50: Steffen Walter changed "Field (specific)" from "Engineering: Industrial" to "Metallurgy / Casting"

Proposed translations

+5
19 mins
Selected

allowed to cool in still air

This is my offering.
Peer comment(s):

agree Mary Worby : Yep - see also in KudoZ glossary under 'ruhige Luft'
5 mins
agree Kay Fisher (X) : This is the one I use regularly (I translate loads of brochures describing this)
39 mins
agree Paul Svensson
1 hr
agree SilLiz (X)
2 hrs
agree Johanna Timm, PhD
7 hrs
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3 KudoZ points awarded for this answer. Comment: "Thank you for your suggestions."
8 mins

cooled in air at rest

analogue to ruhende Flüssigkeit = liquid at rest e.g. Kucera
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9 mins

left to cool (down) at room temperature

perhaps?

or just .. left to cool down
Peer comment(s):

neutral Kay Fisher (X) : It makes a difference whether the air is moving or still -> different cooling rate and consequently (possibly) different steel microstructure
1 hr
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+1
42 mins

air cooled at room temperature

is what I noticed in English standards
Peer comment(s):

agree Simon Oliver
25 mins
neutral Kay Fisher (X) : It makes a difference whether the air is moving or still -> different cooling rate and consequently (possibly) different steel microstructure
28 mins
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+1
3 hrs

cooled in static air

usual technical term for "ruhend" = static (not "at rest" or "still")

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Note added at 2003-03-31 14:23:46 (GMT)
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The opposite (with a fan) = forced cooling


see ref.: http://www.innescorp.com.au/phpdocs/prodlist_cat.php?CatID=T...
Peer comment(s):

agree Kay Fisher (X) : try any of the data sheets on Timken, Crucible or Böhler tool steels. They all say to cool in "still air". e.g.: http://www.timken.com/products/specialtysteel/engineering/te...
2 hrs
maybe, but static is still the correct technical term!
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5 hrs

cooled in still air

Sorry to repeat an answer which someone else has already given, but I wanted to put in the full references for the reply I gave to Gillian.

The first two companies I listed are American-owned companies.

The Crucible reference:
http://www.crucibleservice.com/datash/dss90v7.pdf

"Annealing
Heat to 1650° F (900°C), hold 2 hours, slow cool at a maximum rate of 25° F (15°C) per hour to 1100° F (595C°), then furnace cool or *cool in still air* to room temperature."

The Timken reference
http://www.timken.com/products/specialtysteel/engineering/te...

"Quenching: Air, warm oil, or pressurized gas.
For air cooling, *cool in still air* to 150-125°F (66-51°C).
Sections 10 inches (254 mm) thick or more must be quenched at a faster rate, using one of the methods below, to attain maximum hardness.
For pressurized gas, a minimum quench rate of 300°F per minute (167°C per minute) to below 1000°F (538°C) is critical to obtain the desired properties.
For oil, quench until black, about 900°F (482°C), then *cool in still air* to 150-125°F (66-51°C).
For salt maintained at 1000-1100°F (538-593°C), equalize in the salt, then *cool in still air* to 150-125°F (66-51°C)."

If you want a British reference, here's one from Carrs:
http://www.carrs-tool.co.uk/products/53srSpec.htm

"QUENCHING
(1) Quench in Salt Bath at 540/560°C. Allow to equalise and cool in still air - ALTERNATIVELY
(2) Cool in still air.
Note: In order to obtain a slightly higher hardness figure large sections may be blown, providing this can be done uniformly with dry air. Tools should be tempered immediately whilst still hand warm."

Here's a reference for the heat treatment of a carbon steel. Same thing.
http://www.precisionmarshall.com/s-7.html
"HEAT TREATMENT Preheat thoroughly at 1200-1300°F and raise to hardening temperature of 1725°F. Hold for one hour and *quench in still air*. Upon reaching 150°F, steel should be tempered without delay."

Points should still go to the guy with the same answer who posted first.
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