Thanks to everyone for their input!
I actually found a research report that provides comparative coefficient of friction values for steel and concrete surfaces with differing roughnesses, and when the surfaces were wet and oily. The link to the report is...
Please let me know if anyone has the static coefficient of friction of stainless steel, polished. I would like to compare that to concrete for flooring used in one of our factories. So, a coefficient of friction for concrete is needed too for comparison.
Thanks!