Effect-increasing and energy-saving cutting method for continuous casting steel blank

Abstract

The invention relates to a continuous casting steel blank cutting method, in particular to an effect-increasing and energy-saving cutting method for the continuous casting steel blank. The method comprises the following steps that firstly, the distance between a cutting torch and the continuous casting steel blank is adjusted; secondly, preheating oxygen enters the cutting torch through a preheating oxygen hole way, effect-increasing and energy-saving gas enters the cutting torch through an effect-increasing and energy-saving gas hole way, and cutting oxygen enters the cutting torch through acutting oxygen hole way; and thirdly, the pressure of the preheating oxygen is set to range from 0.2 mpa to 0.3 mpa, the pressure of the effect-increasing and energy-saving gas is set to range from 0.02 mpa to 0.1 mpa, the cutting oxygen pressure is set to range from 1 mpa to 1.2 mpa, and cutting is conducted. According to the cutting method, the gas can be saved by 60% or above and can be saved by about 80% to the maximum, oxygen can be saved by about 40%, the steel cutting gap width is reduced by about 50%, the production efficiency is improved by about 30%, carbon dioxide emission is reduced by 60% or above, field smoke is reduced by about 50%, the steel cutting surface is smooth and free of phenomena of undercut burning collapse and adhering slag, recarburization and hardening, and thesteel cutting section is attractive.

Description

technical field [0001] The invention relates to a continuous casting billet cutting method, in particular to a continuous casting billet efficiency-enhancing and energy-saving cutting method. Background technique [0002] Flame cutting is a process in which industrial gas and oxygen are mixed and burned to reach the temperature required for cutting, and the steel material is melted, slag blown and divided. The specific method is to use industrial gas to preheat the metal to be cut to the point where it can burn violently, and then release the high-pressure oxygen flow to further violently oxidize the metal and blow off the slag produced by the combustion to form an incision. At present, the industrial gas used is propane gas, natural gas or blast furnace gas, etc. It is found in the process of use that the gas and oxygen saving degree is not high enough and the steel consumption is relatively large in the process of cutting the billet by using the above industrial gas. More...

AI Technical Summary

Problems solved by technology

At present, the industrial gas used is propane gas, natural gas or blast furnace gas, etc. During the process of use, it is found that the gas and oxygen saving degree is not high enough and the steel consumption is relatively large in the process of cutting the billet by using the above-mentioned industrial gas.

Moreover, at present, the continuous casting billet cutting of international and domestic iron and steel enterprises generally adopts the traditional cutting nozzles that have lasted for decades. However, in the process of use, rough steel cutting surface, undercutting, burning and slag hanging, carburization and hardening appear, resulting in unsightly cutting of steel

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