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A Composite Steelmaking Process for Improving Steelmaking Precision

A technology of technology and precision, which is applied in the field of compound steelmaking technology, can solve the problems of unstable molten steel composition and low precision, and achieve the effects of improving dynamic conditions, improving the precision of molten steel composition, and reducing consumption

Active Publication Date: 2019-12-10
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a composite steelmaking process that improves the precision of steelmaking. By adopting the oxygen supply mode of constant lance position variable pressure and ultrasonic stirring, the molten steel composition is unstable and the precision is low. It has the advantages of stable control of molten steel composition and high precision

Method used

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  • A Composite Steelmaking Process for Improving Steelmaking Precision
  • A Composite Steelmaking Process for Improving Steelmaking Precision
  • A Composite Steelmaking Process for Improving Steelmaking Precision

Examples

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Embodiment 1

[0038] Embodiment 1: refer to figure 1 , a composite steelmaking process for improving steelmaking precision, including converter steelmaking and LF furnace steelmaking;

[0039] Among them, converter steelmaking includes the following steps:

[0040] Step 1, prepare molten iron and scrap steel, control the temperature of molten iron ≥ 1250 ° C, P ≤ 0.14%, slag content ≤ 0.5%, add molten iron to the converter, and then add preheated scrap steel to the converter. The weight percentage of the molten iron is 75%, the percentage by weight of steel scrap is 25%;

[0041] Step 2: Continuously blow oxygen into the lowering lance, and add the first slag-forming material at the same time. The first slag-forming material is lime and dolomite. The amount of the first slag-forming material added is 12kg / t. The oxygen supply intensity is 1.6m 3 / t.min, the oxygen pressure is 0.9MPa for 0-5 minutes, 1.1MPa for 6-10 minutes, 1.0MPa for 11-15 minutes, 1.2MPa for 16-20 minutes, point Blow ...

Embodiment 2

[0050] Embodiment 2: A compound steelmaking process for improving steelmaking precision. The difference from Embodiment 1 is that the weight percentage of molten iron in step 1 is 80%, and the weight percentage of steel scrap is 20%.

Embodiment 3

[0051] Embodiment 3: A compound steelmaking process for improving steelmaking precision. The difference from Embodiment 1 is that the weight percentage of molten iron in step 1 is 85%, and the weight percentage of steel scrap is 15%.

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Abstract

The invention discloses a composite steel-making technology with a function of improving steel-making precision, relates to the technical field of steel-making and solves the problems of unstable molten steel composition and low precision. The method comprises the steps of converter steel-making and LF (ladle furnace) steel-making. With adoption of an oxygen supply mode based on constant lance position and variable pressure, slag making and slag melting are facilitated, dynamic conditions of reaction in the furnace are greatly improved, and decarburization, dephosphorization and desulfurization are promoted, besides, ultrasonic waves are introduced during adding of a first slag-making material, fast reaction of the slag-making material and molten steel is promoted, and precision of the molten steel composition is improved; by means of introduction of the ultrasonic waves, argon flow can be reduced during addition of the slag-making material, consumption of argon is reduced, and steel-making cost is reduced; the ultrasonic waves are introduced during adding of the slag-making material, so that the slag-making material is dispersed uniformly and prevented from caking, and the impurities in the slag-making material are prevented from remaining in the molten steel.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, more specifically, it relates to a compound steelmaking process for improving steelmaking precision. Background technique [0002] Converter steelmaking is to blow oxygen into molten pig iron to oxidize impurities such as silicon and manganese. A large amount of heat is released during the oxidation process (1% silicon can increase the temperature of pig iron by 200 degrees Celsius), which can make the furnace reach a sufficiently high temperature. In addition to adopting more mature secondary refining technologies such as submerged arc heating in reducing atmosphere, vacuum degassing, argon blowing and stirring with breathable bricks, LF refining furnace also introduces synthetic slag refining technology to achieve desulfurization and deoxidation through reasonable slagging process Even for the purpose of denitrification, so as to effectively absorb the inclusions in the steel a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C7/00C21C7/064C21C7/068C21C7/072
CPCC21C5/30C21C7/0056C21C7/064C21C7/068C21C7/072Y02P10/20
Inventor 金鑫刘和家
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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