S315MC steel is defined in EN 10149-2 standard, the material number is 1.0972. S315MC steel work / steel structure / steel machining parts is made from S315MC steel raw material.
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.