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Production method of high-cleanliness high-titanium low-carbon steel

A technology with high cleanliness and production methods, applied in the field of iron and steel metallurgy, can solve the problems of low cleanliness, low product quality, and poor steel quality, and achieve the effects of high molten steel cleanliness, good casting quality, and reduced burning loss.

Active Publication Date: 2021-12-14
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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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 titanium content is high, the steel quality becomes poor, the cleanliness is low, and the final product quality is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Converter into the furnace [S] 0.008%, converter tapping temperature 1670 ℃, end point carbon 0.05%, online argon blowing during tapping, tapping time 5.2 minutes, slag thickness 50mm, ladle headroom height 350mm, tapping 4 / 5 Start to add high-titanium and low-carbon steel refining slag 3.2kg / ton of steel into the ladle, blow argon to the ladle after tapping, the argon blowing flow rate is 80NL / min, and the argon blowing time is 6min. The composition is (CaO+BaO+SrO): 50%, MgO: 6%, SiO 2 : 3%, Al 2 o 3 : 25%, F - : 2%, TiO 2 : 12%

[0036] When 1 / 4 of the steel is tapped from the converter, high-carbon ferromanganese and aluminum ferromanganese are added to alloy the manganese, aluminum and other elements in the steel, and they are controlled to the composition of the finished product. When the RH treatment starts, 40TiFe is added at one time to make the titanium in the steel Control the composition of the finished product, and the vacuum cycle time after adding th...

Embodiment 2

[0043] Converter into furnace [S] 0.004%, converter tapping temperature 1690°C, end point carbon 0.08%, argon blowing on-line during tapping, tapping time 6.3 minutes, slag thickness 80mm, ladle headroom height 500mm, tapping 4 / 5 Start to add high-titanium and low-carbon steel refining slag 7kg / ton of steel into the ladle. After tapping, the ladle is blown with argon. For, (CaO+BaO+SrO): 42%, MgO: 5%, SiO 2 : 5%, Al 2 o 3 : 20%, F - : 3%, TiO 2 :twenty two%;

[0044] Low-carbon ferromanganese and aluminum shot were added to alloy the manganese, aluminum and other elements in the steel when the converter was tapping 2 / 3 of the steel, and controlled to the finished product composition; after RH treatment for 2 minutes, 80TiFe was added at one time to make the steel The medium titanium is controlled in the composition of the finished product, and the vacuum cycle time after adding the alloy is 15 minutes;

[0045] After the RH treatment, the molten steel is refined by argon...

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Abstract

The invention relates to a production method of high-cleanliness high-titanium low-carbon steel, belonging to the technical field of iron and steel metallurgy. The technical problem to be solved by the invention is that when the titanium content is high, the steel quality becomes poor, the cleanliness is low, and the quality of the final product produced is low. The invention provides a production method of high-cleanliness high-titanium low-carbon steel, which is produced according to the converter-RH-argon-blowing-slab continuous casting process flow, the end point of the converter is controlled, the converter is tapped, and the RH deoxidizes and alloys the molten steel step by step. During the tapping process, high-titanium and low-carbon steel refining slag is added to the ladle to make slag and the ladle slag composition is controlled. Mold slag is used in the pouring process, and the titanium content in the steel is 0.15‑0.8% by mass fraction. The invention can realize the smooth pouring of high-titanium low-carbon steel, and auxiliary materials such as ladle slag, tundish covering agent and mold slag have a good ability to absorb non-metallic inclusions, and the performance can still remain stable after absorbing a large number of inclusions. The cleanliness of the molten steel is high, and the quality of the poured slab is good.

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-cleanliness high-titanium low-carbon 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/00C21C7/06C21C7/10B22D11/111B22D11/22B22D11/16C22C38/02C22C38/04C22C38/06C22C38/14
CPCC22C33/04C21C7/0006C21C7/06C21C7/10B22D11/111B22D11/225B22D11/16C22C38/02C22C38/04C22C38/06C22C38/002C22C38/14
Inventor 张敏曾建华尹晶晶吴国荣
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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