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