CrMo steel scrap dephosphorization and chrome-preservation smelting process

Abstract

The invention discloses a CrMo steel scrap dephosphorization and chrome-preservation smelting process, and belongs to the field of resource recycling and green production. A used raw material is a chip alloy scrap, and is smelted through a medium-frequency induction furnace; Bao / Cao mixed base dephosphorization agent with specific content is added; a low-vacuum dephosphorization and chrome-preservation technological process is adopted, so that the metallurgy energy consumption is reduced, and the emission of CO2 in the steelmaking production is decreased; the content of an element P is 0.01%; the recovery rate of Cr reaches 92%; alloy components satisfy the requirements of the ASTM standards of USA; the recovery rate of such alloy elements as Cr, Ni and Mo in steel scraps is improved; and the production cost of per ton of steel is reduced about 250 yuan.

Description

technical field [0001] The invention belongs to a steelmaking process, in particular to a CrMo steel waste dephosphorization and chromium-preserving smelting process. Background technique [0002] CrMo steel is the most representative type of steel among alloy steels, also known as medium-temperature hydrogen-resistant steel. It has good hydrogen corrosion resistance and high temperature resistance, so it is widely used in ships, oil refining, chemical industry, electric locomotives, gas turbines and other equipment requiring corrosion resistance and high temperature equipment. Due to the unique properties of CrMo steel and alloy steel Recycled materials can be used to reduce production costs and other factors. The economical production method of smelting high-quality CrMo steel under renewable resources has been continuously explored at home and abroad. [0003] As we all know, alloy steel uses emulsion to cool and lubricate during the cutting process. During the natural ...

AI Technical Summary

Problems solved by technology

[0003] As we all know, alloy steel uses emulsion to cool and lubricate during the cutting process. During the natural stacking process of waste chips, they often contact the medium and cause corrosion, so that there are a lot of harmful impurities in the waste chips. The negative effect of alloy steel waste recycling is Phosphorus enrichment, high phosphorus content will cause the "cold brittleness" of steel, reduce the surface tension and crack resistance of steel, dephosphorization is one of the important tasks in smelting alloy steel, the dephosphorization method in the current smelting process, the steel The Cr in the alloy is also oxidized together. During the smelting process, ferroalloy needs to be added to match the effective components such as Cr in the alloy, resulting in a waste of resources and an increase in energy consumption.