Method for smelting reinforced bar steel with 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, achieve the effects of reducing smelting costs, increasing the strength of steel bars, and increasing the oxidation resistance

Active Publication Date: 2019-09-06
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 pro

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 method for smelting reinforced bar steel with low cost and belongs to the technical field of metallurgy. The method for smelting reinforced bar steel with the low cost is provided for solving the problem that the production cost of the reinforced bar steel in the prior art is high. According to the method, after semi-steel is added into a converter, and while blowing is carried out, converter finished point waste slag is added into the converter; in the tapping process, when one third of tapping is reached, graphite carburant is added into a steel ladle, and when twothirds of tapping is reached, silicon iron and high-carbon ferromanganese are added. According to the method, remnant V in semisteel is fully utilized for enhancing the strength of reinforcing bars, cheap graphite carburant, silicon iron and high-carbon ferromanganese are adopted for deoxidization, the content of carbon, silicon and manganese is controlled, and the smelting cost of a reinforced bar steel converter is reduced remarkably.

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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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
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