Process of producing SPHC with low cost, short flow and high efficiency

Abstract

The invention discloses a process of producing SPHC with low cost, short flow and high efficiency and belongs to the technical field of ferrous metallurgy processes. The process comprises the following steps of a, preparation of molten iron and waste steel; b, converter blowing: feeding the molten iron prepared in the step a into a converter by adopting a "one-ladle through" manner, and adding theprepared waste steel into the converter for blowing; c, refining outside furnace: feeding the molten steel in the converter into a steel ladle to complete the steel tapping process after smelting, rising a temperature by 8-15 DEG C on the basis of the step b while performing deoxidation treatment during steel tapping, adding a carburant, a metal deoxidizing agent, white lime and refining slag along with a steel flow, and then performing top slag recycling treatment, calcium treatment, argon blowing, ladle killing and deslagging to finally obtain refined molten steel; and d, continuous casting. For the process provided by the invention, the treatment process is shortened, consumption of an energy medium can be reduced, the cost is lowered, and indexes of a finally obtained product are easily controlled.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy technology, and relates to a production technology of SPHC, in particular to a low-cost, short-flow process and high-efficiency production technology of SPHC. Background technique [0002] SPHC is a grade of steel. This grade was originally a German grade and was also used in Japan. Later, the domestic steel mill Baosteel introduced it, representing hot-rolled steel plates (the corresponding cold-rolled plates are SPCC), which is equivalent to the national standard GB699 (high-quality carbon steel). plain steel structure). This type of steel is low-carbon and low-silicon steel. It is relatively difficult to produce in actual production and the process is complicated. In order to ensure product quality, the production process generally adopted is complicated and the cost is high, especially when producing this type of steel. The flocculation of the bag and the nozzle may cause a ...

AI Technical Summary

Problems solved by technology

[0003] The process used in the early production of SPHC steel required molten iron pretreatment---converter blowing---refining (IF-refining furnace) for composition and temperature fine-tuning---calcium treatment followed by argon blowing---ladle ballasting (Or carry out RH (degassing furnace) treatment)----tundish electromagnetic stirring---a series of continuous casting processes to achieve and improve the quality of molten steel and the continuous castability of molten steel. This traditional process produces The cost mainly comes from the consumption of iron and steel materials, energy medium consumption and refractory material consumption. Energy medium consumption mainly includes steam, oxygen, water, argon, gas, smelting electricity, etc. The production cost is high, the process flow is complicated, and the production efficiency is low.

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