Not withstanding the difference in cost, hot rolled being cheaper to produce and buy than cold rolled. Is there any great difference in how stronger, more malliable, springy, either type are. I am talking of 1mm, 1.6, and 1.8 in thickness here and it ultimately will be used to form shall we say 3 sided shapes initially.
Cold rolled tends to be stronger. less malleable, more springy, than hot, as the cold working stiffens it up a little.
It's also better to weld, paint etc.
Hot rolled is more malleable, but that's about it on the positive side.
1.8mm is pretty thick for cold rolled. I'd probably have trouble finding it. At that thickness I'd probably go for the cheaper option. On 0.8-1.2, cold would invariably be my material of choice.
Thinnest hot rolled sheet I've ever seen is 1.5mm, below that its all cold reduced, hot rolled is a bit more malleable, less likely to crack if your working it hard, cold reduced is likely to be flatter and free from surface flaws, so better for fine work, consistent bending etc,
1.8mm is not a standard thickness 2mm is the next size up to 1.5mm.
We tend to use HR for most things down to about 1.2mm, unless theres lots of welding to do on it where the scale is a pain.
Only ever seen CR upto 3mm, next best thing then up is probably hot rolled, pickled and oiled (HRPO)
Welderpaul asks the difference between hot rolled and cold reduced.
I was ordering steel a few days back and asked this. on 1.6mm sheet it is another three quid. so it is CR for me from now on, at least at this thickness.
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