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Method for smelting reinforced steel at low cost

A low-cost technology for reinforced steel, applied in the field of metallurgy, can solve the problems of high cost of reinforced steel, and achieve the effects of reducing smelting costs, increasing oxidation, and increasing the strength of steel bars

Active Publication Date: 2021-08-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is the technical problem of the high cost of producing reinforced steel in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The semi-steel composition is: C: 3.40%, P: 0.070%, S: 0.020%, V: 0.050%, 120t converter smelting, the last furnace will leave the slag at the end of the converter, after the converter is mixed with the semi-steel, the blowing is started At the same time, 40-50kg / t of waste slag at the end of the converter that has been crushed and screened is added to the furnace. The distance between the oxygen lance nozzle and the metal liquid level of the molten pool is 1.4-2m, and the blowing lance is 1.4m-1.8m. The position of the blowing gun is 2m to prevent the gun from burning, and the position of the carbon pulling gun is 1.4m to ensure that the slag has good fluidity, so as to dissolve the slag early, remove more phosphorus and protect the furnace lining; when the oxygen blowing progress is 0-40%, the oxygen lance Oxygen supply intensity is 2.5~3.0m 3 / t·min, the oxygen blowing progress is 40% to the end of blowing, and the oxygen supply intensity of the oxygen lance is 3.5~4...

Embodiment 2

[0028]The semi-steel composition is: C: 3.40%, P: 0.070%, S: 0.020%, V: 0.050%, 120t converter smelting, the last furnace will leave the slag at the end of the converter, after the converter is mixed with semi-steel, it will start blowing At the same time, 40-50kg / t of waste slag at the end of the converter that has been crushed and screened is added to the furnace. The distance between the oxygen lance nozzle and the metal liquid level of the molten pool is 1.4-2m, and the blowing lance is 1.4m-1.8m. The position of the blowing gun is 2m to prevent the gun from burning, and the position of the carbon pulling gun is 1.4m to ensure that the slag has good fluidity, so as to dissolve the slag early, remove more phosphorus and protect the furnace lining: when the oxygen blowing progress is 0-40%, the oxygen lance The oxygen supply intensity is 2.5-3.0m 3 / t·min, the oxygen blowing progress is 40% to the end of blowing, and the oxygen supply intensity of the oxygen lance is 3.5-4.5...

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Abstract

The invention discloses a low-cost method for smelting reinforced steel, which belongs to the technical field of metallurgy. In order to solve the problem of relatively high production cost of reinforced steel in the prior art, the present invention provides a low-cost method for smelting reinforced steel: after adding semi-steel into the converter, blowing is started and at the same time waste slag at the end of the converter is added to the furnace for blowing; During the tapping process, when 1 / 3 of the steel is tapped, a graphite-like recarburizer is added to the ladle, and when 2 / 3 of the steel is tapped, ferrosilicon and high-carbon ferromanganese are added. The invention makes full use of the residual V in the semi-steel to increase the strength of the steel bar; uses cheap graphite-like recarburizers, ferrosilicon and high-carbon ferromanganese to deoxidize and control the content of carbon, silicon and manganese, and significantly reduces the cost of steel converter smelting.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-cost method for smelting reinforced steel. Background technique [0002] Reinforcement bar is one of the steel products with the largest output in my country, and its designation is composed of HRB and the minimum yield point (MPa) of the steel of this designation. HRB is the first letter of the English abbreviation of Hot rolled ribbed bars (Hot rolled Ribbed Bars), there are three grades of HRB335, HRB400 and HRB500. The common process for producing high-strength ribbed steel bars in my country is to microalloy the steel with V, Nb and Ti. Due to the rapid increase in output, there is also a serious shortage of V and Nb resources. From the perspective of the total reserves and output of V in the world, if my country's high-strength ribbed steel bars continue to use V microalloying technology, all V in the world will be Demand exceeds supply. Nb my country...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C7/00C21C7/064C21C7/06C22C38/04C22C38/12C22C38/02C22C35/00
CPCC21C5/30C21C7/0025C21C7/0068C21C7/06C21C7/064C22C35/005C22C38/002C22C38/02C22C38/04C22C38/12Y02P10/20
Inventor 陈路曾建华梁新腾王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP