Method for producing free-cutting steel
A production method and composition technology, applied in the field of free-cutting steel production, can solve the problems of reduced machinability, poor machining performance, sticking of knives, etc., and achieve the effect of improving machinability and chip breaking performance
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[0007] The electric arc furnace is used for production. Firstly, the S element, which is prone to fluctuations, is controlled. In order to stabilize its content, fire bricks (acid slag) are made. After the S component is stable, add Mn element according to the ratio of Mn:S=3.5, so that the S and Mn in the steel will form complete MnS in proportion, and no other compounds will be produced. During the reduction process, no ferrosilicon powder will be added, and calcium carbide will be used completely. As a reducing agent, the slag condition is always kept yellow-brown to facilitate the stability of S. Finally, chemical analysis is carried out. If the ratio of Mn and S is 3.5, it can be poured into steel ingots. If there is any deviation, fine-tuning of the composition can be cast into steel ingot.
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