Re: offtopic: translate this
The tiny little bit I know about steel I learn more than forty years
ago and even then it was presented to me in Czech, but I am pretty
sure Martin made several unfortunate guesses. He wrote:
>> "The chief application
>The main use
Not bad so far ;)!
>>of composite rolls
>Don't know about composite - composed of several types of steel?
>I think "rolls" refers to long strips of metal coiled up.
No. "Rolls" refers to shape forming rollers. As far as I remember,
composite rolls are basically rollers made from several layers,
usually hard cast iron on the surface, with a tough steel core.
>>in the rolling of steel
>Rolling steel is to put a plate or strip of steel between pairs of
>rollers to make it thinner
This is quite correct. Except the final product does not have to be
flat: strips, sheets and plates. It could be other, more complex
profiles, rods, 'angles', 'I' beams, 'channels', etc, even tubes and
other hollow cross-sections.
>> has been for work rolls
>Work rolls are the raw material provided by a smelter to a
>manufacturer
I do not think so. Work rolls are the shaping rollers, as against the
rolls that just guide the material or provide axillary pressure.
>>in four-high hot and cold strip mills
>Four-high is maybe a mill that works four strips off rolls through
>rollers at once
Mills with vertically stacked pairs of rollers for multiple passes of
material, back and forth.
>>and in plate mills;
>A mill that chops the strip from a roll into plates?
No. Over a certain thickness, sheets are simply called plates.
>>in the rolling of nonferrous metals,
>Nonferrous metals are like aluminum, brass, copper, etc. - anything
>without iron
Without _substantial_ amount of iron...
>>the chief application has been for rolls for hot breakdown and
>No suggestions about hot breakdown
Hot breakdown means the initial working, preliminary passes of ingots
- glowing hot chunks of metal.
>> cold reduction of sheet and strip."
>I think cold reduction is making the metal thinner by pressure
>without heat.
In general, heat is not applied during rolling operations themselves,
but the workpiece can sometimes be repeatedly re-heated. Cold
reduction is used to achieve superior surface finish, closer
tolerances and desired mechanical properties through cold working of
the metal.
jiri
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