A method of smelting weathering steel

A technology of weathering steel and molten steel, which is applied in the field of steelmaking, can solve the problems of high production cost of weathering steel and reduce production cost, and achieve the effect of reducing raw material cost, solving high production cost, reducing cost and process consumption

Active Publication Date: 2017-10-10
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a method for smelting weathering steel, which is used to solve the technical problem of high production cost of weathering steel in the prior art and reduce production cost

Method used

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  • A method of smelting weathering steel

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Experimental program
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Embodiment

[0028] Please refer to figure 1 , the embodiment of the present application provides a method of smelting weathering steel, the method comprising:

[0029] Step S1: performing pre-desulfurization treatment and slag removal treatment on the molten iron to obtain low-sulfur molten iron with a mass percentage of sulfur less than or equal to 0.001%, wherein the slag removal rate of the molten iron in the slag removal treatment is greater than 95%;

[0030] Step S2: transfer the low-sulfur molten iron into the top-bottom combined blowing converter, and add 0.065-0.067t of scrap steel and 0.032-0.05t of nickel-containing pig iron to each ton of the low-sulfur molten iron for converter blowing to obtain the mass of sulfur The molten steel to be treated with a percentage content less than or equal to 0.006% and a mass percentage content of nickel of 0.07-0.09%;

[0031] Step S3: Refining the molten steel to be treated by using CAS-OB (Composition Adjustment by Sealed Argon Bubbling–O...

example 1

[0047] 1) The molten iron is pretreated by KR desulfurization to obtain molten iron with an S content of 0.0002%;

[0048] 2) Then transfer the above-mentioned desulfurized molten iron into a top-bottom combined blowing converter for blowing, add 20t of scrap steel and 15t of low-nickel pig iron for converter blowing. At the end of the converter blowing, the steel is tapped with a sliding plate to stop the slag. When tapping the steel, argon gas is blown at the bottom of two channels to stir, and the flow rate of each bottom blow is controlled at 300NL / min. 208Kg, add 1600kg of aluminum and iron when the tapping amount is 2 / 5;

[0049] 3) After tapping, increase the bottom blowing argon to 600NL / min (each channel), turn off the bottom blowing argon after stirring for 3-5 minutes, take a molten steel sample to analyze [S] content is 0.0042%, [Ni] content 0.089%;

[0050] 4) After the molten steel with [S] content of 0.0042% and [Ni] content of 0.089% is transferred to the CAS...

example 2

[0053] 1) The molten iron is pretreated by KR desulfurization to obtain molten iron with an S content of 0.00001%;

[0054] 2) Then, before transferring the above-mentioned desulfurized molten iron into the top-bottom combined blowing converter for blowing, add 25t of scrap steel and 10t of low-nickel pig iron. At the end of the converter smelting, the steel is tapped with a sliding plate to stop the slag. When tapping the steel, argon is blown from the bottom of two channels to stir, and the flow rate of each bottom blow is controlled at 300NL / min. When the steel output is 1 / 5, 980Kg of small-grained lime and 328Kg of fluorite are added. , Add 1500kg of aluminum and iron when the tapping amount is 2 / 5;

[0055] 3) After tapping, increase the bottom blowing argon to 800NL / min (each channel), turn off the bottom blowing argon after stirring for 3-5 minutes, take a molten steel sample to analyze [S] content is 0.0046%, [Ni] content 0.073%;

[0056] 4) After the molten steel wi...

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Abstract

The invention discloses a method for smelting weathering resistant steel. The method comprises the steps that pre-desulfuration processing and drossing processing are carried out on molten iron, and low-sulphur molten iron with the sulphur mass percentage composition smaller than or equal to 0.001% is obtained, wherein the drossing rate of the molten iron on which drossing processing is carried out is larger than 95%; the low-sulphur molten iron is shifted into a top-bottom combined blowing converter, 0.065-0.067 t of scrap steel and 0.032-0.05 t of nickel containing pig iron are added in each ton of low-sulphur molten iron, converter smelting is carried out, and to-be-processed molten steel with the sulphur mass percentage composition smaller than or equal to 0.06% and the nickel mass percentage composition of 0.07-0.09% is obtained; and refining processing is carried out on the to-be-processed molten steel through the CAS-OB technology, and a plate blank is obtained on the basis of continuous casting of the molten steel on which refining processing is carried out. According to the technical scheme, the content of the nickel component in the molten steel is adjusted through the nickel containing pig iron, the pre-desulfuration of the molten iron is carried out before refining, the CAS-OB technology is adopted during refining, and the cost of raw materials and production consumption are reduced; and the technical problem that in the prior art, the production cost of the weathering resistant steel is high is solved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for smelting weathering steel. Background technique [0002] Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy steel series between ordinary steel and stainless steel. Weathering steel is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the toughness and plasticity of high-quality steel. Extension, forming, welding and cutting, abrasion, high temperature, fatigue resistance and other properties; weather resistance is 2 to 8 times that of ordinary carbon steel, and paintability is 1.5 to 10 times that of ordinary carbon steel. [0003] With the current expansion of world steel production capacity, the smelting of weathering steel is also rapidly expanding, so the demand for raw material Ni resources also increases, resulting in a soaring price of nickel resources, especia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C7/064C21C7/072
CPCY02P10/20
Inventor 王朝斌郭小龙景财良单庆林彭国仲陈玉鑫黄俊
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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