Process for smelting MC5 roller by using return scraps

Abstract

The invention relates to a process for smelting an MC5 roller by using return scraps. The process comprises the following steps: S01, selecting the return scraps as a furnace charge for smelting the MC5 roller; S02, feeding the return scraps selected in the step S01 to a medium-frequency induction furnace to melt as the furnace charge; S03, carrying out deoxidation and desulfurization on molten steel of the return scraps smelted in the step S02 in an LF (Ladle Furnace), and accurately adjusting the components of the molten steel; S04, pumping the molten steel processed in the step S03 in a VD (Vacuum Degassing) furnace in vacuum, enabling occluded foreign substances to float upwards, and removing harmful gases; and S05, carrying out die casting by using the molten steel processed in the step S04, so as to manufacture an MC5 roller steel ingot. The invention provides a metallurgical technology for increasing alloy utilization rate in the return scraps and producing the MC5 roller by using the return scraps produced in smelting, forging and machining processes.

Description

technical field [0001] The invention relates to the technical field of special steel metallurgy, in particular to a process for smelting MC5 rolls by utilizing MC5 returned material. Background technique [0002] In the special steel smelting production process, forging material, rolling material production process and mechanical processing process, a large number of returned alloy steel heads, scraps and steel scraps are produced every year. How to use these materials in industrial production and improve their utilization as much as possible The efficiency is a problem that special steel production enterprises need to solve. [0003] MC5 is a kind of high-carbon metallurgical production, which is usually produced by EBT electric arc furnace smelting, LF refining, VD vacuum refining, die casting, electroslag remelting or related smelting process routes. This production method is suitable for the production method using scrap steel as raw material , if the returned alloy ste...

AI Technical Summary

Problems solved by technology

[0003] MC5 is a kind of high-carbon metallurgical production, which is usually produced by EBT electric arc furnace smelting, LF refining, VD vacuum refining, die casting, electroslag remelting or related smelting process routes. This production method is suitable for the production method using scrap steel as raw material , if the returned alloy steel is used as the raw material and the above-mentioned process route is used for production, there are mainly the following problems: (1) The normal power EAF initial smelting, the refining furnace smelting cycle is long, and the power consumption is high, which seriously affects the service life of the electric furnace lining and ladle lining, Content control of molten steel inclusions and die-casting production organization; (2) If the EAF electric arc furnace is used to melt chromium-containing alloy steel and return alloy steel, the amount of alloy elements such as Cr burned during the oxygen blowing smelting process is large, generally more than 20%, and the content of alloy elements The recovery rate is low, which is not suitable for economical production needs; (3) There are no LF furnaces and VD in the follow-up smelting with the intermediate frequency furnace, and there are deficiencies in the control of the inclusion content and gas content of molten steel; (4) The smelting process of the refining furnace It takes a long time to smelt a large number of alloys; (5) There are many uncontrollable factors in the production process, resulting in unstable chemical composition and production costs between furnaces and large fluctuations