1results about How to "Improve deep drawing performance" patented technology

This application relates to a clean steel and its preparation method. The clean steel composition includes: C: ≤0.0030%; N ≤0.0020%. Such a pure composition meets the requirements of steel used in high-end fields. The method obtains clean steel through electric furnace smelting of all scrap steel or high scrap ratio steel, ladle refining process, continuous casting, heating, and rolling. It effectively controls the nitrogen and oxygen content in the molten steel, ensuring the high purity of the steel. In particular, at the end of the decarburization treatment of the RH vacuum circulation degassing refining process, a certain amount of methane is mixed into the bottom blowing gas. The methane reacts with the oxygen in the molten steel to generate a large number of CO bubbles, which enhances the stirring of the molten steel, promotes the flotation of inclusions, and improves the cleanliness of the molten steel. At the same time, the CO bubble effect improves the denitrification efficiency of the molten steel. Furthermore, since the methane gas consumes some of the oxygen in the molten steel, the oxygen content of the molten steel is reduced at the end of the decarburization treatment, thereby reducing the amount of aluminum alloy used for deoxidation and further improving the cleanliness of the molten steel.