Increasing the hardness of ShKh15 steel in its products

摘要: The methods of reaching a high hardness, which is the main characteristic determining service resistance rolling tools (sheet mill rolls, cogging-down mandrels cold-rolling tube mills, etc.), in low-alloy hypereutectoid steels are theoretically grounded. “ultrahigh hardness” effect shown to be achieved when structure steel preliminarily prepared and disperse ferrite-cementite mixture forms it. This upon special-purpose quenching followed by medium tempering. As result such nonstandard heat treatment, carbide particles become an order magnitude smaller than secondary carbides that form conventional annealing. grades subjected additional treatment listed, specific technological procedures provide increase hardness quenched described. result, 68–69 HRC reached experimental samples commercial ShKh15 steel.