Metal Hardness at different temperatures

SQuinn

We use different types of metal as "coupons" for testing impacts of contaminants in steam flow paths. Typically we use mild carbon steel, aluminum, and brass. I realize that these are vague terms for the materials. We typically use Brinell hardness as a desciption for hardness.

Does anybody know if there is a chart that shows the different hardness of these metals, particularly around 700 F?