SACM645 steel round bar is widely used for manufacturing high fatigue strength, high abrasion resistance, the exact size after heat treatment, high strength and so on. The following is more informational about SACM645 steel round bar.
ASTM 6150 steel round bar under ASTM A29 standards and it is a fine grained, highly abrasion resistant carbon-chromium alloy steel. More informational about ASTM 6150 steel round bar, please see the following.