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Pretty sure just highly polished. I've had a couple Belgian 98 sporters and an fn Browning and bolts were all in the White and highly polished. Seem to really resist rust well due to buffed surface.
I also have owned numerous FN Mausers and various Swedish rifles that feature polished bare steel bolt handles, but they don't resemble the Heym bolt handle. It looks like chrome plating.
Did the chrome test. Apparently, it is just very highly polished bare steel. (Used an old chrome Triumph tank badge as a control. The cold blue didn't mark it at all.) Thanks for the tip.
Trust the Germans to put such a high polish on bare steel that it looks like chrome plating.