Production method of high titanium steel

A production method and high-titanium technology, which is applied in the field of iron and steel metallurgy, can solve the problems of steel breakout and continuous pouring, and achieve the effects of reducing steel slag reaction, good internal quality, and stable slag system performance

Active Publication Date: 2022-03-22
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] The technical problem solved by the invention is that when the existing high-titanium steel is produced by the "converter-refining-continuous casting" process flow, there are serious breakouts, continuous pouring cannot be realized, and the billet has serious defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Converter into furnace [S] 0.008%, converter tapping temperature 1670°C, end point carbon 0.05%, tapping process: online argon blowing, tapping time 5.2 minutes, slag thickness 50mm, ladle clearance height 350mm;

[0035]When 1 / 4 of the steel is tapped from the converter, high-carbon ferromanganese and aluminum iron are added to alloy the manganese, aluminum and other elements in the steel, and are controlled at the lower limit of the composition. LF is added with carbon powder, medium-carbon ferromanganese, and aluminum wire to Carbon, manganese and aluminum in the steel are adjusted to the composition of the finished product, RH treatment starts, and 40TiFe is added at one time to control the titanium in the steel to the composition of the finished product, and the vacuum cycle time after adding the alloy is 20 minutes;

[0036] Add 2kg / ton of high-titanium steel refining slag and 0.5kg / ton of fluorite to the ladle when the converter is tapping 4 / 5, and add 2.5kg / ton o...

Embodiment 2

[0042] Converter into the furnace [S] 0.004%, converter tapping temperature 1690 ℃, end point carbon 0.08%, online argon blowing during tapping, tapping time 6.3 minutes, slag thickness 80mm, ladle clearance height 500mm;

[0043] Low-carbon ferromanganese and aluminum pellets are added to alloy the manganese, aluminum and other elements in the steel when the converter is tapping 2 / 3 of the steel, and are controlled at the lower limit of the composition. LF adds carburant, metal manganese, and aluminum pellets to make the steel Medium carbon, manganese, and aluminum are adjusted to the composition of the finished product. After RH treatment for 2 minutes, 80TiFe is added twice to control the titanium in the steel to the upper limit of the composition of the finished product. After adding the alloy, the vacuum cycle time is 15 minutes;

[0044] Add 5kg / ton of high-titanium steel refining slag and 2.0kg / ton of fluorite to the ladle when the converter is tapping 4 / 5,

[0045] At ...

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Abstract

The invention relates to a production method of high-titanium steel, belonging to the technical field of iron and steel metallurgy. The technical problem to be solved by the present invention is that when the existing high-titanium steel is produced by the "converter-refining-continuous casting" process flow, there are serious breakouts and continuous casting cannot be realized, and the billet has serious defects. The invention provides a production method of high-titanium steel, which is produced according to the converter-LF-RH-slab continuous casting process flow, the end point of the converter is controlled, and the molten steel is deoxidized and alloyed in steps of converter tapping, LF, and RH, and converter tapping, LF Add high-titanium and low-carbon steel refining slag into the ladle to make slag and control the composition of the ladle slag. The pouring process uses mold slag, and the titanium content in the steel is 0.1-0.8% by mass fraction. The invention realizes continuous pouring for more than 120 minutes, and the poured billet has no cracks on the surface, good internal quality, and no central cracks and middle cracks.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a production method of high-titanium steel. Background technique [0002] Titanium is a good deoxidizer and an effective element for fixing nitrogen and carbon in steel. The application of titanium in steel is mainly based on microalloying. Adding a certain amount of titanium (0.01% to 0.03%) in steel can refine the structure of steel, improve the strength of steel, and improve the plasticity and impact toughness of steel. And so on. With the increase of titanium content in steel, the toughness, processability and wear resistance of the product are greatly improved, especially when Ti≥0.15% in steel, a large amount of micron-sized (1-5μm) TiC (≥80% ) and a small amount of TiN, the wear resistance of the product is more than 10 times that of titanium microalloyed steel, and the service life of the product is significantly extended. [0003] Since t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10B22D11/111C21C7/06C21C7/076C22C33/04
CPCC21C7/10C21C7/076C21C7/06B22D11/111C22C33/04Y02P10/20
Inventor 曾建华张敏李凌玲杨森祥
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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