Method for reducing surface cracks of alloy steel, alloy steel and preparation method of alloy steel

A surface crack, alloy steel technology, applied in the workpiece surface treatment equipment, metal rolling, metal rolling and other directions, can solve the problem of "copper embrittlement" that cannot be avoided, and reduce the phenomenon of "copper embrittlement" and "copper embrittlement". , reduce the effect of quality accidents

Active Publication Date: 2022-04-19
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects caused by the straightening cracks of the slab, and the defect of "copper embrittlement" that cannot be avoided in the prior art due to the fluctuation of Ni content in the steel, thereby providing a method for reducing the surface cracks of alloy steel Method and alloy steel and preparation method thereof

Method used

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  • Method for reducing surface cracks of alloy steel, alloy steel and preparation method of alloy steel
  • Method for reducing surface cracks of alloy steel, alloy steel and preparation method of alloy steel
  • Method for reducing surface cracks of alloy steel, alloy steel and preparation method of alloy steel

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Embodiment 1

[0040] The present embodiment provides a kind of preparation method of alloy steel, comprises the following steps:

[0041] 1) Pretreatment of molten iron: heating molten iron to 1295°C, using 85% CaO-15% CaF 2 Desulfurizer, add 5.9kg of desulfurizer per ton of iron; insert the stirring head into the molten steel at a depth of 1.2m, and the stirring speed is 90r·min -1 , the stirring time is 7min; the S content of deep desulfurization of molten steel is 0.0080%;

[0042] 2) Converter smelting: Converter charging 170t, including scrap steel 17t, molten iron 153t; blowing oxygen supply intensity 28000Nm 3 h -1 , the single furnace blowing time is 16min, and the end point C of the converter is controlled at 0.04%; 350kg of lime, 1280kg of silicon-manganese alloy, 2120kg of ferrochrome, and 250kg of aluminum-based deoxidizer are sequentially added in post-treatment, and the end point temperature of the converter is 1638°C;

[0043] 3) LF refining: first furnace inlet and outlet...

Embodiment 2

[0053] The present embodiment provides a kind of preparation method of alloy steel, comprises the following steps:

[0054] 1) Pretreatment of molten iron: heating molten iron to 1310°C, using 85% CaO-15% CaF 2 Desulfurizer, add 6.0kg of desulfurizer per ton of iron; insert the stirring head into the molten steel at a depth of 1.25m, and the stirring speed is 85r min -1 , stirring time 8.3min; deep desulfurization of molten steel S content 0.0090%;

[0055] 2) Converter smelting: converter charging 170t, including scrap steel 25.5t, molten iron 144.5t; blowing oxygen supply intensity 28000Nm 3 h -1 , the single furnace blowing time is 14min, and the end point C of the converter is controlled at 0.03%; 350kg of lime, 1260kg of silicon-manganese alloy, 2080kg of ferrochrome, and 295kg of aluminum-based deoxidizer are sequentially added in post-treatment, and the end point temperature of the converter is 1640°C;

[0056] 3) LF refining: first furnace inlet and outlet temperatu...

Embodiment 3

[0066] The present embodiment provides a kind of preparation method of alloy steel, comprises the following steps:

[0067] 1) Hot metal pretreatment: hot metal is heated to 1380°C, using 85% CaO-15% CaF 2 Desulfurizer, add 5.0kg of desulfurizer per ton of iron; insert the stirring head into the molten steel at a depth of 1.3m, and the stirring speed is 100r·min -1 , the stirring time is 7min; the S content of deep desulfurization of molten steel is 0.0065%;

[0068] 2) Converter smelting: Converter charging 170t, controlled scrap ratio 17t, molten iron 153t; blowing oxygen supply intensity 28000Nm 3 h -1 , the single furnace blowing time is 13.2min, and the end point C of the converter is controlled at 0.05%; 350kg of lime, 1290kg of silicon-manganese alloy, 2180kg of ferrochrome, and 260kg of aluminum-based deoxidizer are added in sequence for post-treatment, and the end point temperature of the converter is 1645°C;

[0069] 3) LF refining: the first furnace inlet and out...

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Abstract

The invention belongs to the technical field of continuous casting processes in the metallurgical industry, and particularly relates to a method for reducing surface cracks of alloy steel, the alloy steel and a preparation method of the alloy steel, and the method for reducing the surface cracks of the alloy steel comprises the steps of continuous casting and heating; in the continuous casting step, the upper surface temperature of a straightening section continuous casting billet is controlled to be larger than the lower surface temperature, delta T is larger than 0 and smaller than or equal to 60 DEG C, and the lower surface temperature T of the straightening section continuous casting billet is larger than or equal to 840 and smaller than or equal to 900 DEG C; the heating step at least comprises two heating stages, and the time of the first heating stage is 0 lt; t is less than or equal to 15 minutes, the temperature T is more than or equal to 1060 and less than or equal to 1100 DEG C, and the total heating time is 110-160 minutes. By controlling the straightening temperature of the continuous casting billet, the straightening temperature difference of the upper surface and the lower surface and the heating process, the copper brittleness phenomenon of the sulfuric acid dew point corrosion resistant steel belt is effectively reduced, the edge of a finished product is free of macroscopic edge cracks, the plate surface is free of V-shaped copper brittleness cracks, and the copper brittleness defect rate is reduced.

Description

technical field [0001] The invention relates to the technical field of continuous casting technology in the metallurgical industry, in particular to a method for reducing surface cracks of alloy steel, alloy steel and a preparation method thereof. Background technique [0002] Sulfuric acid dew point corrosion-resistant steel refers to the addition of a certain amount of alloying elements to the steel, so that when the steel is exposed to sulfuric acid gas (such as a steel chimney that emits sulfur-containing waste gas), it will increase the resistance to the dew point below the dew point by SO 2 , SO 3 and H 2 O combined with the corrosion resistance of sulfuric acid generated. [0003] Sulfuric acid dew-point corrosion-resistant steel is mainly used in the manufacturing of components such as chimneys, gas savers, air preheaters, and desulfurization equipment to resist sulfuric acid formed by condensation of sulfur-containing flue gas and water at lower temperatures (≤150...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16C21D8/02C22C38/02C22C38/04C22C38/42C22C38/60C22C38/50C22C38/06C22C33/06B21B37/74B21B45/08
CPCB22D11/16B22D11/001C21D8/0242C21D8/0205C22C38/02C22C38/04C22C38/42C22C38/60C22C38/50C22C38/06C22C33/06B21B37/74B21B45/08
Inventor 李永亮麻晗关建辉邵久刚徐祝兵徐学千
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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