D3 Alloy Steel Round Bar 1, Round/Plate/Square bar in ful size 2, Hardness ... : HRC=60, HBS<=370 3, ISO 9001 2008 certificated D3 Alloy Steel Round ... Bar1, Round/Plate/Square bar in ful size2, Hardness: HRC ... =60, HBS<=370 3, ISO 9001 2008 certificated 1, ...