Method of manufacture of a solid steel piece, such as a toroidal thick has a high hardness gradient along its thickness and the sheet has a high hardness gradient thick.

摘要

The massive component is placed in a furnace whose temperature is controlled above the AC3 temperature of the steel. The surface temperature Ts of the component is controlled continuously. When the temperature Ts exceeds AC3 the component is withdrawn from the furnace and is rapidly cooled. IMAGE