The rule of thumb $100 per section
There isn't much market for them as radiators, as scrap, it will vary depending on where you are at. Cast iron is the least valuable iron and the price will vary day to day. $20 to $100 a ton.
There are several companies who produce or sell cast iron models of radiators. For example, try the company 'Cast Rads' of the 'Radiator Center' for these radiators.
As hot as whatever is circulating inside of them is.
Almost all car manufacturers have used cast iron radiators at one time or another, however most are now made of an aluminum alloy that can cool the water intake quickly.
Through cast Iron radiators and copper tubing and schedule 40 black steel piping
Of course NOT A Problem as electrolytic action most of the times happen between piping that contains galvanized coating (Zinc) Cast Iron radiators for example have BRASS valves which can contain as much as 85% copper If one looked at the clean outs of cast iron piping the CO's are brass with never any adverse actions
Why not try Antique Plumbing and Radiators? Stocking over 4500 cast iron radiators, you're sure to find the perfect one for your bathroom. All radiators are pressure tested and come with a one year guarantee from date of purchase.
A column radiator is used to describe a typical cast iron radiator. The term describes the vertical columns that make up the radiator. The radiators can also be made out of steal and not cast iron. The steal is welded together.
Are you considering this in a residence? A friend of mine converted a residential steam system with cast iron radiators to hot water for child safety reasons. It all worked, but he had to deal with some water leaks at joints in the radiators. That was a nuisance. The amount of heat delivered to the house will be different with water, but I can't remember if the radiators are oversized or undersized after conversion. In his case it heated fine. Call a professional. EPM
Answer There might be air trapped in the radiator, try bleeding. It's usually a flow problem. If the valves on all of the radiators are wide open, the steam will flow through the path of least resistance, often leaving some of the radiators lacking for heat. Try turning down the flow on some of the hotter radiators. You will need to spend a little time adjusting the flow... assuming that you have flow adjusting valves on the radiators. These old cast iron radiators have sections that are bolted together. Each section has a gasket to keep the steam or hot water INSIDE the radiator. Of course these old radiators collect rust over the years unless you are very careful and scientific about your water chemistry (most folks are not). You probably have a plugged hole in one of the gaskets between the section of the radiator that is getting hot and the section that is not getting hot. This "cold" section is being bypassed and not receiving any flow.
No
I don't think they make cast iron anymore. About the only way to replace cast iron is to go to auctions or yard selling to find the. You can try to repair the skillet if it means that much to you.