I think s219 is correct. I have many 4" to 6" trees that I need to cut low to the ground in a severely overgrown pasture. Has anyone tried a carbide chain for cuttng close to the ground. I'd be interested in knowing how well it worked out.
Based on what I've heard they're never as sharp as a steel chain and can't be sharpened without sending it back to the factory.
No, it can be done by anybody with a diamond wheel and the right machine. My local saw shop can do it. If you wanted to spend the bucks, you could do it yourself. It's not worth it, in my book. Like you said, you can buy a new steel chain for the cost of one sharpening.
I bought some of Carlton's carbide impregnated chain, which I can't find online anymore. Instead of the carbide insert welded to the steel link, it had splinters of carbide somehow impregnated into the tooth. Sharpened with an ordinary wheel. Don't think a file would touch it, though.
I got it to cut some railroad ties. Waste of money. Once you hit one of those embedded stones in the tie, you are done.
I sharpened it up and used it on regular firewood. Again, not impressed. But then, I don't know how that stuff would really compare to the full carbide chain.
I've heard the same as 4570man. It's never as sharp, and it's a bear to sharpen. I think it's probably best reserved for specialized use where you are cutting into something abrasive that would chew up a steel chain.