Cold Rolled/Hot Rolled?

[mhorowit]

Thinking about splicing and gussets and finger straps.
Looking thru the Dillsburg catalog I see under sheetmetal the indication 'C.R." and "H.R", which I take to me cold or hot rolled.

What determines which I need? - MIke

[jdoran]

Re: Cold Rolled/Hot Rolled?

Mike,

It means just what you said.

Steel starts out in a "billet" which is a fancy name for a massive piece of red hot steel. The steel billet is progressively fed thru rollers that have settings to make the steel thinner and thinner as it goes thru the rollers on the line.

Hot rolled steel is made to a specific thickness while it is hot, and cold is compressed slightly to a smaller guage when cold. The tolerances are not as good for hot rolled steel because of the changes that occur during cool down, and because the steel is less stable when hot. Cold roll costs more.

Buy aircraft grade steel. It doesn't cost much, it is higher grade quality, it should weld better, and can be bought in the small sized pieces we need.


John

[flybikefarm]

Re: Cold Rolled/Hot Rolled?

To bad everone doesn't live by me. One of my former students works for a major aircraft tubing suppler. He just gave me a BUNCH again tonight. George