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Originally Posted by ZZII 527
I'm not disagreeing with you, though; I also think steels you mentioned are more appropriate for this part. The steel I'm using is most noteably used for knife blades... I'm using what was quick and readily available, for now. (McMaster sells 5/32" stock of tool steel, but unfortunately not 4140.) I'm not recommending that anyone go out and buy a plate of tool steel for these, but if teams try hardening the original carrier and it is the same as ours, they will see tool-steel hardness. I'd like to see if the low end of that range can work.
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McMaster has the steel you need in rod form, your choice of 4340, 4130 or 4140. If you really want to use the water jet, buy oversize, slice and face to make your plate, then cut it on the water jet. I don't want to dissuade you from experimentation because it is a good learning experience, but in the end you want a part that does not break. If you want your carrier plate to be bullet proof use the 4340 (or the 4130, or the 4140) that you can get from McMaster.
Eugene