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A kind of rolling steel and rolling steel inclusion control method

A control method and a technology of inclusions, applied in the manufacture of converters, etc., can solve problems such as low production efficiency and yield, affecting customers' normal use, and holes in finished products, so as to improve product competitiveness, expand market applications, and improve cleanliness Effect

Active Publication Date: 2022-07-01
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the process of cold rolling to 0.1mm chrome plating by downstream customers, large inclusions (inclusions with a size > 50 μm) will be exposed intensively, which will further cause holes in the finished product or breakage during the drawing process, affecting the normal use of customers and the yield of finished products Low
[0003] In order to control the surface quality and inclusions of the slab, some steel mills use the surface polishing technology to remove the surface defects and inclusions of the slab. The polishing depth is about 10-20mm, and the production efficiency and yield are low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A rolled steel produced by the following inclusion control method:

[0031] (1) Converter smelting

[0032] Tapping temperature: 1625℃, T[O]: 497ppm;

[0033] The tapping is good, the tapping time: 4.8min, the number of tapping: 130 times, the steel flow has no scattered flow phenomenon, and the tapping is slag;

[0034] In the tapping process, 300kg of top slag lime and 100kg of modifier are added for slag washing;

[0035] (2) RH furnace refining

[0036] Vacuum treatment time: 10min, pure degassing time: 8min, make the maximum vacuum degree ≤3mbar (pressure behind the vacuum valve);

[0037] Outbound [Als]: 497ppm, Outbound C: 60ppm;

[0038] (3) LF furnace refining

[0039] (3.1) Refining time control: refining time 57min;

[0040] (3.2) Process aluminum supplementation: aluminum alloy is not supplemented within 8 minutes before calcium treatment;

[0041] (3.3) Gas control: micro-positive pressure control in the whole process of LF refining, argon protection i...

Embodiment 2

[0058] A rolled steel produced by the following inclusion control method:

[0059] (1) Converter smelting

[0060] Tapping temperature: 1631℃, T[O]: 560ppm;

[0061] The tapping hole is good, the tapping time: 5.6min, the number of tapping holes: 47 times, the steel flow has no scattered flow phenomenon, and the tapping slag is blocked;

[0062] In the tapping process, 300kg of top slag lime and 100kg of modifier are added for slag washing;

[0063] (2) RH furnace refining

[0064] Vacuum treatment time: 13min, pure degassing time: 9min, make the maximum vacuum degree ≤3mbar (pressure behind the vacuum valve);

[0065] Outbound [Als]: 526ppm, Outbound C: 83ppm;

[0066] (3) LF furnace refining

[0067] (3.1) Control of refining time: refining time is 49min;

[0068] (3.2) Process aluminum supplementation: aluminum alloy is not supplemented within 8 minutes before calcium treatment;

[0069] (3.3) Gas control: micro-positive pressure control throughout the LF refining pr...

Embodiment 3

[0086] A rolled steel produced by the following inclusion control method:

[0087] (1) Converter smelting

[0088] Tapping temperature: 1628℃, T[O]: 468ppm;

[0089] The tapping hole is good, the tapping time: 5.2min, the number of tapping holes: 154 times, the steel flow has no scattered flow phenomenon, and the tapping slag is blocked;

[0090] In the tapping process, 300kg of top slag lime and 100kg of modifier are added for slag washing;

[0091] (2) RH furnace refining

[0092] Vacuum treatment time: 12min, pure degassing time: 6min, make the maximum vacuum degree ≤3mbar (pressure behind the vacuum valve);

[0093] Outbound [Als]: 376ppm, Outbound C: 78ppm;

[0094] (3) LF furnace refining

[0095] (3.1) Refining time control: refining time 67min;

[0096] (3.2) Process aluminum supplementation: aluminum alloy is not supplemented within 8 minutes before calcium treatment;

[0097] (3.3) Gas control: micro-positive pressure control in the whole process of LF refinin...

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Abstract

The invention relates to a rolling steel and a control method for rolling steel inclusions. The rolling steel is produced by the following control methods: (1) converter smelting, (2) RH furnace refining, (3) LF furnace refining, (4) continuous furnace Casting protection casting, step (3) Soft blowing and calcium treatment in the refining stage of the LF furnace, one soft blowing for 3-5 minutes, the flow rate is 200-800 NL / min, and the feeding amount of calcium treatment is 160-220 m / furnace to ensure the outbound Ca : 20~35ppm or Ca / Als≥0.08, secondary soft blowing for 12~18min after calcium treatment, flow rate is 80~220NL / min, aluminum, alloy and heating operations are prohibited during soft blowing and calcium treatment, and molten steel is strictly prohibited during soft blowing exposed. The control method of the invention can improve the quality of rolled steel products, reduce the quality objection rate, and finally achieve the purpose of reducing cost and increasing efficiency.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to a rolling steel and a control method for rolling steel inclusions. Background technique [0002] With the continuous development of the industry, the chrome-plated steel strip obtained by cold-rolling the rolled steel to a thickness of 0.1mm and chrome-plating has been widely used in the food packaging and optical cable industries. In the production of rolled steel, aluminum deoxidation is usually used in steel refining, and Al is formed at the end of deoxidation. 2 O 3 and aluminate inclusions, in order to meet the high cleanliness requirements of ultra-thin chrome-plated optical cable tapes, calcium treatment is required to remove Al 2 O 3 and aluminate inclusions; light calcium treatment, improper soft blowing treatment, easy to generate CaO 2Al 2 O 3 and CaO 6Al 2 O 3 , these calcium aluminates accumulate and grow inside the tundish or nozzle, are washed into th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06B22D11/117C21C7/10C21C7/072C21C5/28
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/002C22C38/001B22D11/117C21C7/10C21C7/072C21C7/0056C21C5/28
Inventor 李晓冬赵景全王中辉尚天傲王大伟常智乾陈兵马宁
Owner RIZHAO STEEL HLDG GROUP