Rolling method of sulfur-containing free-cutting stainless steel wire rod

Abstract

The invention belongs to the technical field of metal pressure processing, and particularly relates to a method for rolling a sulfur-containing free-cutting stainless steel wire rod, which comprises the following steps of: 1, formulating a heating furnace process according to steel grade characteristics, and prolonging the time of a high-temperature section by 10-20 minutes compared with a conventional process; secondly, the speed of a roller way after spinning is reduced, so that the wire rods are further stacked compared with a conventional process, and heat loss is reduced; thirdly, after spinning, a roller way is covered with a heat preservation cover of 18 m, heat loss is reduced, and the heat preservation effect of off-line solid solution is achieved; 4, a water explosion device is additionally arranged at an outlet of the heat preservation cover, and the water quenching effect of off-line solid solution is achieved; and 5, collecting coils according to a conventional process, and discharging the coils. By controlling the heat preservation time of the high-temperature section of the heating furnace, heat preservation after spinning and water explosion, carbide and a second phase are subjected to solid solution in an austenite matrix, the offline solid solution process links after products are taken out of a rolling line are reduced, the quality problems of mixed crystals, scratches and the like caused by offline solid solution are avoided, and meanwhile the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing, and in particular relates to a rolling method of a sulfur-containing free-cutting stainless steel wire rod. Background technique [0002] Free-cutting stainless steel refers to stainless steel materials with excellent cutting performance. In order to improve the cutting performance, S, P, Pb, Sn, Se, Te, Bi and other elements are generally added. These elements form inclusions of specific shapes in the stainless steel matrix, cut off the continuity of the stainless steel matrix, and reduce the cutting resistance of stainless steel. At the same time This type of inclusion promotes chip breaking to form a small and short curl radius during cutting, which is easy to remove, reduces tool wear, reduces machined surface roughness, and improves tool life. [0003] Sulfur-containing free-cutting stainless steel is currently the most widely used free-cutting stainless steel in the indus...

AI Technical Summary

Problems solved by technology

This problem has become a long-standing quality problem for manufacturers of sulfur-containing free-cutting stainless steel, which seriously affects the pass rate and yield of products.

[0004] At present, there are papers discussing the improvement of this defect from the aspects of grinding, hot rolling, solid solution, etc., but no clear improvement measures are given.

Images