Electric furnace for producing Cr13 series stainless steel and smelting control method for refining furnace

Abstract

The invention provides an electric furnace for producing Cr13 series stainless steel and a smelting control method for a refining furnace, wherein the process flow of the control method is as follows:raw material preparation - electric furnace trough type tapping - VOD blowing process - refining furnace process - molding process. The invention has the following beneficial effect: the lectric furnace for producing the Cr13 series stainless steel and the smelting control method for the refining furnace provided by the invention have the following advantages: the Cr element metal yield of the prepared Cr13 series stainless steel is greater than or equal to 95%, and compared with the prior art, the smelting time is shortened by more than 30min ; the smelting cost of Cr13 series stainless steel is greatly reduced, avoids genearating aluminum-chromium spinel inclusions in molten steel, has a significant improvement on the purity of molten steel, and can meet the increasingly quality requirement of stainless steel products in the downstream industries of steel enterprises.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a method for producing Cr 13 A series of stainless steel electric furnace and refining furnace smelting control method. Background technique [0002] The continuous development of iron and steel smelting technology has made the cost issue a research hotspot and difficulty in this field, which also makes cost reduction and efficiency increase an eternal theme in the development of iron and steel smelting technology. Cr 13 Series stainless steel is an important product type in the steel field, and its grade is mainly 20Cr 13 , 30Cr 13 , 40Cr 13 etc., belong to martensitic stainless steel. Due to its high strength and corrosion resistance, it has a wide range of applications. 12Cr 13 Can be used to make machine parts, such as steam turbine blades; 20Cr 13 Can be used to make shafts and tie rods for steam equipment; 40Cr 13 Can be used to manufacture parts wor...

AI Technical Summary

Problems solved by technology

[0003] in Cr 13 In terms of the production process of series stainless steel, the existing technology mainly adopts the process of EAF→VOD→LF→IC, and adopts this method to smelt Cr 13 The recovery rate of series stainless steel is 80% on average; in the refining process, a second slag replacement process is required, which has the disadvantages of large amount of slag material and slow production pace; the Cr lost in the VOD process cannot be recovered, eventually resulting in Cr element Metal yield is low

In addition, in order to remove the oxygen in the molten steel during the refining process, a large amount of aluminum ingots need to be added. If the control is not proper, the problem of exceeding the standard of type B inclusions in the steel often occurs, which in turn causes a substantial increase in manufacturing costs

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