Can a felon get a hazmat on his cdl in Michigan?

No. Not in Michigan, nor in any other state. If the felony conviction was for something defined as a felony only under state law, but not under federal law, then it may be possible to apply for relief of disability to be able to obtain a hazmat endorsement. If was for something defined as a felony under federal law, there is a mechanism for relief of disability in place - however, it receives no funding, whatsoever, and therefore it does not happen.