High-purity steel and production process

A technology of production process and purity, applied in the field of high-purity steel and production process, can solve the problems of adverse effects of molten steel quality, increased consumption of aluminum strips, difficult to remove alumina inclusions, etc., so as to achieve fewer nozzle nodules and reduce impurities. The content and the effect of adding high efficiency

Active Publication Date: 2021-05-14
天津荣程联合钢铁集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a single manganese-based alloy and aluminum particle pre-deoxidation method is used in the tapping process, not only will the consumption of aluminum strips be increased due to the premature addition of a strong aluminum-based deoxidizer under peroxidation conditions, but it will also face difficulties such as large amounts of alumina inclusions that are difficult to remove , which will eventually adversely affect the quality of molten steel

Method used

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  • High-purity steel and production process
  • High-purity steel and production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A high-purity steel prepared by the following process, comprising the following steps:

[0042] (1) Primary smelting of converter

[0043] (11) First add molten iron to the converter, and the temperature of the molten iron entering the furnace is controlled at ≥ 1250 ° C. In terms of mass percentage, P in the molten iron is ≤ 0.120%, and the slag content is ≤ 0.5%; then, scrap steel is added to the molten iron, and the molten iron The total amount of scrap steel and steel scrap added is 110t, of which scrap steel is 32t; after that, top-blown oxygen and bottom-blown argon are used to stir and compound blow for 12-min, the pressure of top-blown oxygen is 1.0MPa, nitrogen is blown 2 minutes before bottom blowing, and then switched to Bottom blowing argon; adding lime 32kg / t steel and dolomite 9kg / t steel to make slag during the blowing process, slag is melted throughout the process, and the slag alkalinity is controlled at 3.8; at the end of blowing, molten steel C≥0.08%;...

Embodiment 2

[0057] A high-purity steel prepared by the following process, comprising the following steps:

[0058] (1) Primary smelting of converter

[0059] (11) First add molten iron to the converter, and the temperature of the molten iron entering the furnace is controlled at ≥ 1250 ° C. In terms of mass percentage, P in the molten iron is ≤ 0.120%, and the slag content is ≤ 0.5%; then, scrap steel is added to the molten iron, and the molten iron The total amount of steel scrap added is 112t, of which scrap steel is 30t; after that, top-blown oxygen and bottom-blown argon are used to stir and composite blow for 13 minutes, the pressure of top-blown oxygen is 0.9MPa, nitrogen is blown 3 minutes before bottom blowing, and then switched to bottom blowing Argon gas; add lime 35kg / t steel and dolomite 8kg / t steel to make slag during the blowing process, and control the slag alkalinity at 3.5 during the whole process; at the end of blowing, C≥0.08% in molten steel; P≤0.015% ; Tapping temper...

Embodiment 3

[0073] A high-purity steel prepared by the following process, comprising the following steps:

[0074] (1) Primary smelting of converter

[0075] (11) First add molten iron to the converter, and the temperature of the molten iron entering the furnace is controlled at ≥ 1250 ° C. In terms of mass percentage, P in the molten iron is ≤ 0.120%, and the slag content is ≤ 0.5%; then, scrap steel is added to the molten iron, and the molten iron The total amount of steel scrap added is 115t, of which scrap steel is 25t; after that, top-blown oxygen and bottom-blown argon are used to stir and composite blow for 15min, the pressure of top-blown oxygen is 0.8MPa, nitrogen is blown 4min before bottom blowing, and then switched to bottom blowing Argon gas; add lime 37kg / t steel and dolomite 7kg / t steel to make slag during the blowing process, and control the slag alkalinity at 3 during the whole process; at the end of blowing, C≥0.08% in molten steel; P≤0.015% ; Tapping temperature: 1630°C....

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Abstract

The invention relates to high-purity steel and a production process, and belongs to the technical field of steel production. The production process comprises the procedures of carrying out converter primary smelting, carrying out LF refining, carrying out VD vacuum treatment and carrying out continuous casting, the LF refining procedure comprises the following steps that (21) online bottom argon blowing is carried out when the steel enters a station, the argon flow is 120-140L / min, and the Ar pressure is 0.35-0.4MPa; (22) a slag former and a deoxidizing agent are added for first-time electrifying slagging, 6-level voltage is adopted, the current is 28000-30000A, the argon flow is 280-300L / min, the argon pressure is 0.35-0.4MPa, sampling is conducted after slagging is conducted for 8-12min through power transmission heating, and alloy is added to adjust components; the slag former comprises 4.5-7.2kg of calcite per ton of steel, 0.7-1.1kg of fluorite per ton of steel and 0.3-0.5kg of bauxite per ton of steel; and (23) after the components are adjusted, secondary electrifying is conducted, 4-level voltage is adopted, the current is 32000-34000 A, the argon flow is 70-90L / min, the Ar pressure is 0.3-0.35MPa and when the temperature of molten steel is greater than or equal to 1670 DEG C, a silicon-calcium wire is fed. The high-purity steel and the production process have the effects of reducing the impurity content in the molten steel and improving the purity of the molten steel.

Description

technical field [0001] This application relates to the technical field of iron and steel smelting, in particular to a high-purity steel and its production process. Background technique [0002] Chromium-molybdenum steel is widely used in the manufacture of important components in mechanical parts, such as large gears for locomotive traction, crankshafts, connecting rods, engine cylinders, 1200-2000-meter oil deep well drill pipe joints and fishing tools, etc. In recent years, with the domestic and foreign safety supervision departments increasing the safety and reliability of equipment in the petrochemical and coal chemical industries, relevant design units and manufacturing plants have made strict inspections on the chemical composition, internal quality and surface quality of chromium-molybdenum steel under medium and high temperature pressure Quality requirements are becoming more and more stringent, among which the purity of steel is a key indicator to measure the qualit...

Claims

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Application Information

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IPC IPC(8): C21C7/072C21C7/10C21C7/00C21C7/06C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22
CPCC21C7/072C21C7/06C21C7/0056C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22Y02P10/20
Inventor 薛伟张杰袁子成薄宇刘键许明杰牟贝成宝那木斯来
Owner 天津荣程联合钢铁集团有限公司
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