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Boron-iron and iron-titanium composite cored wire and application thereof

A technology of cored wire and ferro-titanium, which is applied in the production field of composite cored wire, can solve problems such as difficulties in the production and use of ferro-boron cored wire, and achieve the effects of low boron content, simplified alloying operation, and small ratio

Inactive Publication Date: 2009-06-03
SHANDONG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the diameter of the iron-boron cored wire is reduced, it will bring difficulties to the production and use of the iron-boron cored wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: smelting 35MnB steel, using the product and method of the present invention to carry out boron alloying and control boron content.

[0030] 35MnB steel specification requires boron content 0.0005% ~ 0.0030%, titanium content 0.030% ~ 0.060%. The boron content control target is 0.0018% to 0.0023%.

[0031] The composite cored wire of ferroboron and ferrotitanium is as follows:

[0032] 1. The boron content of the raw material ferroboron used is 21.67%wt, and the titanium content of ferrotitanium is 30.56%wt; the mixing weight ratio of ferroboron and ferrotitanium is 1:24.

[0033] 2. Mix the dry ferro-titanium and ferro-boron according to the ratio of 1:24 by weight, and at the same time crush it into a powder with a particle size of no more than 3mm, and stir and mix well.

[0034] 3. Make a composite cored wire of ferroboron and ferrotitanium with a diameter of 13mm; the measured weight of every rice flour is 0.460kg.

[0035] Application of composite cor...

Embodiment 2

[0037] Example 2: smelting 27MnTiB steel, using the product and method of the present invention to carry out boron alloying and control boron content.

[0038] 27MnTiB steel specifications require boron content of 0.0005% to 0.0030%, and titanium element of 0.030% to 0.060%. The boron content control target is 0.0018% to 0.0023%.

[0039] The preparation of the composite cored wire of ferroboron and ferrotitanium used is the same as in Example 1.

[0040] Application of composite cored wire for smelting 27MnTiB steel, ferroboron and ferrotitanium:

[0041] After the molten steel is deoxidized and refined by the LF furnace, the aluminum content of the molten steel is analyzed to be 0.033%, the molten steel volume is 53 tons, and 250 meters of composite cored wire of ferroboron and ferrotitanium are fed. The boron content in the molten steel was analyzed to be 0.0002% before feeding the composite cored wire of ferroboron and ferrotitanium, and the boron content in the molten s...

Embodiment 3

[0042] Example 3: smelting 35MnB steel, using the product and method of the present invention to carry out boron alloying and control boron content.

[0043] 35MnB steel specification requires boron content 0.0005% ~ 0.0030%, titanium content 0.030% ~ 0.060%. The boron content control target is 0.0018% to 0.0023%.

[0044] The composite cored wire of ferroboron and ferrotitanium is as follows:

[0045] 1. The boron content of the raw material ferroboron used is 20.59%wt, and the titanium content of ferrotitanium is 31.78%wt; the mixing weight ratio of ferrotitanium and ferroboron is 1:22.

[0046] 2. Mix the dry ferro-titanium and ferro-boron according to the ratio of 1:22 by weight, and at the same time crush it into a powder with a particle size of no more than 3mm, and mix well.

[0047] 3. Make a composite cored wire of ferroboron and ferrotitanium with a diameter of 13mm; the measured weight of every rice flour is 0.468kg.

[0048] Application of composite cored wire f...

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Abstract

The invention relates to a boron-iron and iron-titanium composite cored wire and the application thereof. The powdery raw materials of the boron-iron and iron-titanium composite cored wire include boron iron and iron titanium, wherein the boron content of boron iron is not less than 9wt%, the titanium content of iron titanium is not less than 25wt%, and the mixing ratio of boron iron to iron titanium depends on the actual needs. The boron-iron and iron-titanium composite cored wire is manufactured by adding boron iron and iron titanium to molten steel at the same time, thereby simplifying the alloying operation in boron steel smelting and stabilizing the control of boron content in steel. Compared with the prior boron iron cored wire, the boron-iron and iron-titanium composite cored wire has the advantages of low proportion of boron iron, small fluctuation of deviation of the addition amount of boron iron, less loss, adequate protection of each boron iron fine particle by titanium element, and stable boron recovery rate (over 93%). The boron-iron and iron-titanium composite cored wire achieves the effect that the deviation of boron content in smelting components between furnaces for manufacturing the same boron-containing steel grades is less than 2ppm.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and relates to the production and use method of a composite cored wire made of ferroboron and ferrotitanium. Background technique [0002] Boron steel has good mechanical and process properties, simple heat treatment process and low price. Boron has many resources and less consumption. From the perspective of saving a large amount of expensive alloy elements such as nickel and chromium, boron steel has greater significance and attraction. [0003] During the solidification process of boron steel after smelting and casting, if boron and nitrogen in the steel form BN, the hardenability of the steel cannot be improved, so the nitrogen in the steel must be fixed by forming some kind of nitride, usually with titanium nitrogen. [0004] The prominent role of boron in steel is that a small amount of boron can double the hardenability of steel, but this is also one of its main disadvantages, that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 孙永喜王广连申景霞张锡昌王学利李猛翟正龙
Owner SHANDONG IRON & STEEL CO LTD
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