Prehardening vs. heat-treating steel
Discussion
Heat treating is a term that covers all of the processes you can put material through, i.e tempering, hardening normalising etc. Not quite sure what pre hardening is, never heared of that. Possibly means it is hardened before another process, which makes the final state better for its intended purpose.
I would have liked to help you, SGirl (and get the beer 
), but my online-dictionary http://dict.leo.org has neither of both terms; so I can't spot any difference.
Is there any coherence for these terms?
Bodo
), but my online-dictionary http://dict.leo.org has neither of both terms; so I can't spot any difference. Is there any coherence for these terms?
Bodo
The whole thing comes down to a question of how to translate a particular Swedish word - no context to speak of!
The word is "färdigvärmebehandlad" (= completely heat-treated), but the German translator can't find an equivalent term in German and so has suggested "vorgehärtet" (= prehardened), and I'm just trying to find reasons as to why heat-treated is correct, 'cos I think it is.
Mmm... now I think about it, "färdig-" implies the process is complete, while "vor-" implies that it's a preliminary process.
Zippy500, your explanation seems to back me up. Thanks, you're a star!!
But Bodo, I'll buy you a beer too for trying to help!
>> Edited by SGirl on Tuesday 22 October 19:27
The word is "färdigvärmebehandlad" (= completely heat-treated), but the German translator can't find an equivalent term in German and so has suggested "vorgehärtet" (= prehardened), and I'm just trying to find reasons as to why heat-treated is correct, 'cos I think it is.
Mmm... now I think about it, "färdig-" implies the process is complete, while "vor-" implies that it's a preliminary process.
Zippy500, your explanation seems to back me up. Thanks, you're a star!!
But Bodo, I'll buy you a beer too for trying to help! >> Edited by SGirl on Tuesday 22 October 19:27
"färdigvärmebehandlad"
sounds like "fertig wärmebehandelt"
"fertig" in that context means 'done'; but it's a bit confusing, because "wärmebehandeln" (=heat treating) is a whole process
>>edited to say that I have well recognized the beer-offer
>> Edited by Bodo on Tuesday 22 October 19:32
sounds like "fertig wärmebehandelt"
"fertig" in that context means 'done'; but it's a bit confusing, because "wärmebehandeln" (=heat treating) is a whole process
>>edited to say that I have well recognized the beer-offer
>> Edited by Bodo on Tuesday 22 October 19:32
Bodo said: "färdigvärmebehandlad"
sounds like "fertig wärmebehandelt"
'Zactly. That's why I do both German and Swedish.
"fertig" in that context means 'done'; but it's a bit confusing, because "wärmebehandeln" (=heat treating) is a whole process
I think the implication is that the company in question does all of the heat-treating. Which also backs up my theory that "vorgehärtet" is inaccurate.
Hiya SGirl
I am prepared to admit that Materials Engineering is (was - a long time ago) my field.
Neither term is familiar to me, though my area was offshore and heavy engineering. "Heat-treating steel"?? - you can heat treat any steel (hardening, tempering, annealing etc etc). As for "prehardening" - no idea, have even checked a couple of old textbooks. Could it have been flame-hardening? It's a process used for hardening gears or cams etc
The same material can be sold in a number of different states - the 'raw material' (as it were) or hardened to different hardnesses. You can buy a material for instance and machine it, then have it hardened (cos it uses more tool tips if you machine it when it's hard). So your assumption sounds about right.
Corinne
edited to acknowledge that I hadn't read the bit that said what the context was.
>> Edited by rude girl on Tuesday 22 October 20:03
>> Edited by rude girl on Tuesday 22 October 20:07
I am prepared to admit that Materials Engineering is (was - a long time ago) my field.
Neither term is familiar to me, though my area was offshore and heavy engineering. "Heat-treating steel"?? - you can heat treat any steel (hardening, tempering, annealing etc etc). As for "prehardening" - no idea, have even checked a couple of old textbooks. Could it have been flame-hardening? It's a process used for hardening gears or cams etc
The same material can be sold in a number of different states - the 'raw material' (as it were) or hardened to different hardnesses. You can buy a material for instance and machine it, then have it hardened (cos it uses more tool tips if you machine it when it's hard). So your assumption sounds about right.
Corinne
edited to acknowledge that I hadn't read the bit that said what the context was.
>> Edited by rude girl on Tuesday 22 October 20:03
>> Edited by rude girl on Tuesday 22 October 20:07
Pre-hardening - should this be 'pre-hardened'? This is a term used to describe steels that have been pre-prepared for their intended use. I work in the injection moulding field and there are many steels available 'off the shelf' for mould applications. For example Uddeholm Ramax S which is prehardened to 35RC for use in mould frames. i.e. the steel is machined and used as-is without additional heat treatment.
Heat-treating steel - as rude girl has said, most steels can be heat-treated. In this case the part is machined and then heat-treated to achieve the required properties. (Hardness, toughness etc)
I hope this helps.
Heat-treating steel - as rude girl has said, most steels can be heat-treated. In this case the part is machined and then heat-treated to achieve the required properties. (Hardness, toughness etc)
I hope this helps.
AJL
From the British Plastics Federation website (www.bpf.co.uk)
'Victrex is the sole commercial manufacturer and supplier of aromatic polyketone thermoplastics that are sold under the brand name VICTREX® PEEK™ polymer.'
Not my area, but this suggests you won't be able to source it anywhere else. Sorry 'bout that.
From the British Plastics Federation website (www.bpf.co.uk)
'Victrex is the sole commercial manufacturer and supplier of aromatic polyketone thermoplastics that are sold under the brand name VICTREX® PEEK™ polymer.'
Not my area, but this suggests you won't be able to source it anywhere else. Sorry 'bout that.
nmlowe said: What about 'shot peening' (blasting the metal with ball-bearings) is that done before or after the heat treating?
Used to see it occasionally as a feature of MTB handlebars.
Shot peening is a finishing treatment. Heat treatment of some materials causes degradation of the surface, so would normally shot blast or sand blast afterwards to remove the surface product.
nmlowe said: What about 'shot peening' (blasting the metal with ball-bearings) is that done before or after the heat treating?
Used to see it occasionally as a feature of MTB handlebars.
I've worked on Europe's latest CNC-shot peening machine at BMW-Rolls Royce jet engine production (four years ago).
Shot peening is used to harden surfaces of materials which cannot be heat treated; such as non-ferrous metals (eg. Titanium), high-temperature steel (eg. INCONEL), etc.
It produces a Druckeigenspannung (dunno the English term; similar to pressure-self-tension; SGirl, this is your chance to get a beer
) in the outer surface, which increases firmness by appr. 50% (TiAl). You could say, shot peening replaces heat treatment on critical materials or places.
Bodo
SGirl said: Druckeigenspannung = residual compressive stress
I like this game.
Edited to say: Oh hang on, this is in a turbine context. Would it be the same thing with regard to shot peening?
>> Edited by SGirl on Wednesday 23 October 13:56
Yes, indeed! It is a metalurgical context, as the shot peening process has nothing to do with the function of a jet engine, just a way to treat one of its components.
Nice one, SGirl! Thanks for the translation
It's now one beer to one beer; I suggest we note the quantity in future, and distribute bonuses on occasion
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