Im just saying, at that price, it is probably isn’t the best steel out there. A513 is a fairly “brittle” steel (if I remember correctly - meaning it tends to break more easily then other steels. Another thing to consider is the surface finish. With SS, you don’t have mill scale but you will with other types of steel. It may not be an issue for the LR but it’s something to keep in mind. It will also rust on you, even just sitting around, there is enough moisture in the air to cause it to rust. You can get around this by stripping off the mill scale and then painting it, but that another variable in the accuracy of your machine. Honestly, it all depends on what you want to get out of the LR. If you can get the steel you need to $20 bucks, it’s worth a try. If it does t work out for you, then you are only out $20 and can just replace it is something else.
What website are you getting that info from, because if their prices are that good, I will order my steel from them (I do welding on the side).