From someone who was running a shear prepping iron friday, and someone who has worked around the scrap industry for 3 years. Your not going to get top dollar for rebar, or plate. Usually heavy structural is going to be #1. To get #1 price, you will need to prepare the iron to 3ftx5ft, it is common practice to cut at 2ftx4ft. That way the scrap yard will not dock you for over sized material. Make sure you just have iron when you take it in, otherwise you will be docked for other materials.
I also recommend shopping scrap yards. When you find a good one, stick with them. A lot of yards will try and find ways to dock you on every load. Its pretty simple, they give you, lets say $300 a ton. They turn around and sell it for $350 a ton. The less they pay you, the more they make. Depending on the yard, your going to have different rates. Im going to assume you will not have enough iron to ship directly to a foundry. That is the top rate, usually only gotten by scrap yards, and demo companies doing large industrial projects. Most yards pay what they call a peddler rate. Which is what you will see posted at the yard. If your hauling in over a certain tonnage, usually 500 tons or more, you will make another $50 a ton.
The scrap market is booming right now. The company im working for right now is getting $420 a ton for #1 iron this month. Last year this time it was under $300 a ton. If your planning on getting equipment to process, I would recommend treading lightly. Ive watched the scrap market rates steadily increase for years now. I really think we are going to be topping out real soon. Followed by a crash in prices. Copper has gotten pretty volatile lately. Jumping more than .50 cents a pound monthly. The company Im working for has around 400k invested in a shear and excavator combination. Right now its easy to justify the expense. If iron goes back to $80 a ton, you will be lucky to cut enough to pay for your fuel every day