Ok this was just on history channel and a while back how its made.When steel is heated up the molecules align in to what they called a matrix. This becomes a stronger steel. In cold rolling they start with a huge billet of steel and run it throguh rollers compressing the steel. In cold roll steel youll have the same matrix as you did in the original billet (for the most part its really less change to the matrix). Cold rolling also uses many more rollers and or passes to get the stock to the final size and shape this is why it will tend to have a nicer looking finish.With hot rolled steel the matrix will change become more dense and well aligned. In stock removal this is a good thing as it will grind and file etc smoother for us (more consitancy) than cold rolled. In the end though if your heat treating is good other than the ease of finishing both will end up the same or very close to the same in hardness grain structure etc.Remember on raw hot rolled youll need to remove a portion of the mettal from top bottom and both esdges to get past the scale layer.OT sort of but intresting. You know that alluminum foil you use to wrap your lunch in? Well it is a multi layer or damascus alloy. To get foil they use hot roller to thin out a very huge billet of aluminum. Once its at a given thickness it is folded in half and ran through the rollers again to increase its strength. Depending on how heavy a duty its to be used for it may be folded again and again ran through the rollers. So you heavy duty foil is folded twice giving a 4 layer damscus aluminum foilJust a fun little fact i picked up watchign how its made heheh
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Steel bar is is one of the more simple shapes to request &#; but there are some things that you should know when asking for a quote.
2. Metal Grade1. Hot Rolled vs. Cold Finished
First of all, there is both Hot Rolled and Cold Finished bar. Most typically, a full length Hot Rolled (HR) bar is 20 feet in length and a Cold Finished (CF) bar is 12 feet in length. Although it is possible to find Cold Finished bars that are 20 feet in length as well, but 12 feet is more common.
After that, as we&#;ve mentioned in past buying guides, with all metals, we need to know the specific grade. For example, do you need HR Round Bar, or is it a CF Round Bar?
3. Bar Shape
There are Round, Square, Flat, and Hex bar available in most grades. We can cut bars to length or ship full lengths. Additionally, we can also finish the bars the way you need them. We can have the bars Turned, Ground, and Polished (TG&P) to suit your project.
4. Bar Condition
The condition of the bar is important as well. Do you need it Annealed or Normalized? Does it need to meet a certain ASTM or AMS spec? Do you need Aircraft Quality (AQ)? Do you need the material Charpy Tested? All these things are important in knowing how to best serve your job.
5. Is it Rebar?
Want more information on hot rolled round bar? Feel free to contact us.
There is another very common bar that has a bit different sizing and that is Rebar. ASTM A615 GR 60 is most common, but it can also be Gr 40. The sizing works on a Number system, for example #4 Rebar is ½&#; in Diameter. We do have a complete Rebar Chart in our library that shows a breakdown of all the sizes.
6. Length and Quantities:
We need to know the lengths and total quantities needed to be able to quote any job.
7. Do you Need It Galvanized?
We can also have material Galvanized if needed.
Whether it is Nickel, Carbon, Titanium, Aluminum, Stainless, or Alloy bars we would like to be your supplier. Please let us know your specific request and we can put a quote together for you.
If you are looking for more details, kindly visit hot rolled steel bar.