Production method of ferric stainless steel

Abstract

The invention provides a production method of ferric stainless steel. The production method of the ferric stainless steel comprises manufacturing the raw material of chromium ore powder into balls, preheating and feeding the balls into a smelting furnace to obtain high-carbon chromium-containing molten iron; hot-delivering and charging the high-carbon chromium-containing molten iron into a pretreatment converter for desilicication and decarbonization, then adding in waste carbon steel and regulating temperature and content to obtain chromium-containing molten iron; melting waste carbon steel or steelmaking pig iron to prepare molten iron; proportionally mixing the chromium-containing molten iron and the molten iron to obtain stainless steel mother liquid; smelting the stainless steel mother liquid inside an argon-oxygen refining converter to obtain the ferric stainless steel. The production method of the ferric stainless steel has the advantage of being low in energy consumption, discharge and cost.

Description

technical field [0001] The invention belongs to the field of metallurgy. Specifically, the invention relates to a production method of ferritic stainless steel. More specifically, the invention relates to a production method of directly producing ferritic stainless steel by using chromite. Background technique [0002] In 2017, my country's stainless steel crude steel output reached 25.7737 million tons, an increase of 1.1654 million tons year-on-year, an increase of 4.74%, accounting for more than 50% of the world's stainless steel crude steel production. Among them, the output of chromium stainless steel (400 series chromium steel) reached 5.0679 million tons, accounting for 19.66% of my country's stainless steel output. [0003] With the increasing emphasis on domestic environmental protection concepts, the thorny issue of 200 series scrap steel recycling will make the industry more and more passive, and even fall into infinite worries. 400 series will gradually replace 2...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: ①The ferrochrome alloy is first cast into blocks, and then melted in the electric arc furnace, which increases the melting cost; ②The ferrochrome alloy is melted in the electric furnace, the alloy loss is high, and the metal yield is reduced.

The disadvantages of this process are: ① It is necessary to build a blast furnace capable of supplying molten iron and a complex pre-iron system, which requires high investment; ② Coking, sintering, and blast furnace in the pre-iron system are all high-energy-consuming processes and increase secondary emissions and environmental pollution; ③The existing production of ferrochrome alloy and stainless steel is independent of each other. Generally, stainless steel production enterprises purchase ferrochrome alloy (solid block) from ferrochrome production enterprises, and the production cost of stainless steel production enterprises is affected by the price fluctuation of ferrochrome alloy in the market The impact is relatively large, for example: in 2017, the fluctuation range of high-carbon ferrochrome (50 base) was from 6,500 yuan / ton to 11,000 yuan / ton

Images