As of 2016, There had been 9 Black men (3 during Reconstruction) and 1 Black woman elected to the Senate. One of the men was not seated.
At this time, there had been 1917 men seated as senators and 46 women. I could only find three US Senators that were not seated at all.
As of 2016, 0.47% of all men elected to the US Senate had been Black. 2.17% of all women elected to the US Senate had been Black. 33.3% of all US Senators not seated at all after election have been Black.