Hot rolled steel converter slag washing and direct feeding continuous casting production process

Abstract

The invention relates to a hot rolled steel converter slag washing direct feeding continuous casting production process. Relates to the technical field of metallurgy, in particular to a smelting method of hot rolled steel. According to the molten steel deoxidizer, a silicon-aluminum mixture is changed into pure aluminum, so that a deoxidation product is converted into an Al2O3 concentrated product from a silicon-aluminum composite oxidation product. The removal of Al2O3 concentrated products mainly comprises two modes: 1, physical slag removal of early-stage slag making; 2, a calcium line is added before molten steel pouring, so that an Al2O3 concentrated product is combined with Ca, and a 7Al2O3 * 12CaO compound is generated; the steel ladle slag is alkaline reducing white slag, can adsorb inclusions in molten steel, and can also ensure that the molten steel is not subjected to secondary oxidation. The refining procedure in the original production mode is compressed to the converter argon station to be completed, and the purposes of saving energy consumption and production cost of the refining procedure, improving production efficiency and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for smelting hot-rolled steel. Background technique [0002] Hot-rolled billets mainly include: low-carbon 235, national standard 235, 195 series, SPHC (cold-rolled billet), etc.; because the thickness of the hot-rolled billet rolled slab is between 1.5-9.0mm, the elongation performance and cold-bending performance requirements of the steel Relatively high; when producing this type of steel, each manufacturer will appropriately increase the content of Als (acid-melted aluminum) according to the national standard requirements, the general requirement is between (0.015%-0.045%), in order to optimize the performance of the steel and meet customer needs . Among them, the addition of Als has become a key technology in the entire smelting process. The original manufacturers have adopted the addition of LF refining process, which has achieved the control of Als in molten st...

AI Technical Summary

Problems solved by technology

[0007] However, in the refining process, it is necessary to use refining electrodes to heat and slag to improve the purity of molten steel and meet the requirements of steel types. The power consumption is about 45 degrees / ton, and the refining cost is about 45 yuan / ton

The whole refining process consumes a lot of electric energy, which does not meet the production requirements of energy saving and high efficiency