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Steel-smelting core-wound wire and preparing method

A cored wire and wrapping technology, applied in the field of metallurgy, can solve the problems of exceeding the control requirements of hydrogen, increasing the hydrogen content, and producing waste products, so as to reduce or prevent the increase of hydrogen in molten steel, prolong the storage time, and reduce the effects of waste products.

Inactive Publication Date: 2010-06-02
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

[0003] Currently used calcium-containing alloy powder cored wire (mainly SiCa and FeCa), this type of cored wire has a significant effect in controlling inclusions and improving the casting performance of molten steel, but it is found in actual use that due to the The powder is easy to be affected by moisture, and with the prolongation of the storage time, it will cause the hydrogenation of molten steel during the wire feeding process. The treatment process of calcium-containing alloy powder is often the last process before continuous casting. When such a large amount of hydrogen addition is used to produce steel types with strict [H] content requirements, such as rail steel, it is easy to cause the hydrogen in the steel to exceed the control requirements, resulting in waste product
For other steel types, it may also cause quality defects such as white spots and cracks due to the increase of hydrogen content in the steel

Method used

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  • Steel-smelting core-wound wire and preparing method
  • Steel-smelting core-wound wire and preparing method
  • Steel-smelting core-wound wire and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 Preparation of calcium-containing cored wire of the present invention

[0031] The preparation method of the cored wire provided by the invention is:

[0032] (1) Uncoil the iron sheet (width 52mm, thickness 0.38mm) on the packaging rack for the cored wire, and enter the cored wire production unit;

[0033] (2) Si-calcium alloy powder (calcium ≥ 15%) and iron powder are loaded into the silo;

[0034] (3) Put metal powder separately from the front end of the iron sheet to 5-10m, then put silicon-calcium alloy powder, wrap the core powder in the iron sheet through the cored wire unit, and put iron powder again at a distance of 10m from the tail At the end of the wrapping process, a cored wire with an outer diameter of Φ12mm is made. During the core wrapping process, the wrapped cored wire is rolled into rolls by a coiler. The length of each roll of cored wire is 2800-3000m. At the same time, the "silicon-calcium cored wire" used in the comparative test was ...

Embodiment 2

[0038] Example 2 Preparation of calcium-containing cored wire of the present invention

[0039] The preparation method of the cored wire provided by the invention is:

[0040] (1) Uncoil the steel strip for cored wire (width 52mm, thickness 0.38mm) on the packaging rack and enter the cored wire production unit;

[0041] (2) Pure calcium powder and iron powder are loaded into the feed bin respectively;

[0042] (3) Put metal powder separately at the front end of the strip to 5-10m, and then wrap pure calcium and iron powder at the same time, the weight ratio of which is 30% of pure calcium and 70% of iron powder. The core powder is wrapped in the iron sheet.

[0043] (4) According to the length recorder of the core wrapping process, the valve of the pure calcium silo is closed every time the package is 600m long, and the valve of the pure calcium silo is opened after putting in 10m long iron powder separately, and the pure calcium and Iron powder. Close the valve of the pur...

Embodiment 3

[0048] Example 3 Preparation of calcium-containing cored wire of the present invention

[0049] The preparation method of the cored wire provided by the invention is:

[0050] (1) Uncoil the iron sheet (width 52mm, thickness 0.38mm) on the packaging rack for the cored wire, and enter the cored wire production unit;

[0051] (2) Pure calcium powder and iron powder are loaded into the feed bin respectively;

[0052](3) Put iron powder separately 5-10m before the iron sheet, then put pure calcium and iron powder at the same time, the weight ratio is 24% pure calcium, 76% iron powder, wrap the core powder in the cored wire unit Inside the tin.

[0053] (4) According to the length recorder of the core wrapping process, the valve of the pure calcium silo is closed every time the package is 800m long, and the valve of the pure calcium silo is opened after putting in 10m long iron powder separately, and the pure calcium and Iron powder. Close the valve of the pure calcium silo 10m...

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Abstract

The invention relates to a cored wire for molten steel inclusion modification, improvement of steel performance and alloying. And the wire body used for steel making and formed by wrapping core layerwith shell, where the shell is made of iron material, and the core layer is of cored wire alloy powder and it is characterized in that: the core layer at the head and tail parts of the wire body is formed with obstruction segment by metal powder with low moisture absorbability and no pollution to steel. Besides, the wire body is equipped with multiple obstruction segments in the length direction at intervals according to the wire feeding length. And the cored wire can isolate air from calcium alloy powder to prevent the calcium alloy powder from absorbing moisture, thus reducing or avoiding hydrogen content increase in molten steel in the wire feeding course and able to meet the production requirements of steel series with strictly controlled hydrogen content.

Description

technical field [0001] The invention relates to a cored wire used for inclusion denaturation of molten steel, improvement of steel properties and alloying, and belongs to the field of metallurgy. Background technique [0002] The cored wire feeding technology is an out-of-furnace refining method that has emerged in recent years, and is widely used in the wire feeding technology of modern steelmaking. Alloy cored wire is used in steelmaking, which can purify molten steel, change the shape of inclusions, improve the castability and mechanical properties of molten steel, and can significantly increase the yield of ferroalloy, reduce the cost of steelmaking, and its economic effect is remarkable. Wire technology has greater advantages than powder spraying and directly adding alloy blocks: 1. The composition of molten steel can be fine-tuned and controlled by the wire feeding method (for example, B, Ti elements), and the alloy yield is greatly improved (Ca can be close to 30%). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
Inventor 曾建华李桂军文永才陈永杨素波黎光正冉茂伦
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP