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If thats biz 400 or 500 its cheap. Most places sell to the puplic small amounts of MILD steel for around $6-$7 a kilo, special steels double or more plus time to cut it $1min for a man $1min gas...

Your dozer plates are 500 and if you could test both sides you would probably find the concave side that has been work hardened is up well over 500 brinell. hence the ring:D Got a couple of bits of...