N52 Batman has a feat of kicking a metal door that got 9-A, though that was a really thick door. Still it could get a good number into 9-B.
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As for the door thing: That woman - Magna Tolvan - earlier bonked Aphra on the head (she was bloodlusted and out to kill her at the time) and Aphra was still standing. In the Vader Down arc, she and Han ram into each other headfirst and knock each other out, implying they are physical equals.