This part specifies the grade expression method, ordering content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of powder metallurgy mold steel. This section applies to hot-rolled, forged, and cold-drawn round steel, square steel, and wire rods with a diameter (or side length) not greater than 360 mm, and hot-rolled and forged flat steel with a thickness of 4 mm to 250 mm and a width not greater than 650 mm. powder metallurgy mold steel