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Method for producing 8CrV2 hot-rolled sheet steel

A technology of hot-rolled steel plate and production method, applied in the direction of metal rolling, temperature control, etc., capable of solving specific solutions to key technical problems not mentioned, 8CrV2 preparation technology and method not mentioned, and alloy tool steel not mentioned To improve the quality of casting slab, improve the uniformity of structure and performance, and increase the casting speed

Inactive Publication Date: 2010-08-04
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production of 8CrV2 hot-rolled steel plates has the following main problems: due to the high carbon content and complex alloy composition of 8CrV2, phosphorus and sulfur are likely to cause segregation and loosening of the slab composition, resulting in uneven microstructure and properties of the final product; in addition, the liquidus temperature of 8CrV2 Low, resulting in low billet temperature, if the cooling of the secondary cooling section is too fast, the billet temperature will enter the low-temperature plastic zone, and cracks will occur on the surface and edge of the billet, directly affecting product quality
In addition to not mentioning the specific technology and method of alloy tool steel, the above patents also did not mention the specific solutions to the key technical problems existing in the production process of alloy tool steel, especially the preparation technology and method of 8CrV2

Method used

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  • Method for producing 8CrV2 hot-rolled sheet steel
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  • Method for producing 8CrV2 hot-rolled sheet steel

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Embodiment 1

[0029] The method for producing 8CrV2 hot-rolled steel plates based on the thin slab continuous casting and rolling process described in this embodiment, the process flow: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high pressure water descaling, hot Continuous rolling, laminar cooling, coiling.

[0030] The chemical composition weight percentage ratio (wt%) of the molten steel after the alloying treatment in the refining process is: C 0.75, Si 0.20, Mn 0.30, P 0.010, S 0.004, Cr 0.40, V 0.15, and the rest are Fe and unavoidable Impurities.

[0031] Thin slab continuous casting and rolling process parameters: slab entering furnace temperature T 入 is 905°C, the superheat of molten steel T 过 32°C, finishing temperature T 终 855°C, coiling temperature T 卷 555°C, casting speed S拉 3.6m / min, continuous casting liquid core reduction 2mm, slab thickness 68mm, weak cooling in the secondary cooling section.

[...

Embodiment 2

[0037] The method for producing 8CrV2 hot-rolled steel plates based on the thin slab continuous casting and rolling process described in this embodiment, the process flow: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high pressure water descaling, hot Continuous rolling, laminar cooling, coiling.

[0038] The chemical composition weight percentage ratio (wt%) of the molten steel after the alloying treatment in the refining process is: C 0.85, Si 0.40, Mn 0.60, P 0.023, S 0.024, Cr 0.70, V 0.25, and the rest are Fe and unavoidable Impurities.

[0039] Thin slab continuous casting and rolling process parameters: slab entering furnace temperature T 入 is 980°C, the superheat of molten steel T 过 45°C, finishing temperature T 终 945°C, coiling temperature T 卷 645°C, casting speed S 拉 It is 5.3m / min, the continuous casting liquid core is pressed down 18mm, the thickness of the slab is 52mm, and the secondary ...

Embodiment 3

[0045] This embodiment is based on the method of producing 8CrV2 hot-rolled steel plates based on the thin slab continuous casting and rolling process. The process flow: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling , laminar cooling, coiling.

[0046] The chemical composition weight percentage ratio (wt%) of the molten steel after the alloying treatment in the refining process is: C 0.80, Si0.26, Mn 0.35, P 0.011, S 0.008, Cr 0.42, V 0.23, and the rest are Fe and unavoidable of impurities.

[0047] Thin slab continuous casting and rolling process parameters: slab entering furnace temperature T 入 is 950°C, the superheat of molten steel T 过 39°C, finishing temperature T 终 890°C, coiling temperature T 卷 625°C, casting speed S 拉 4.1m / min, continuous casting liquid core reduction 10mm, slab thickness 60mm, weak cooling in the secondary cooling section. ...

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Abstract

The invention provides a method for preparing high-quality 8CrV2 hot-rolled sheet steel based on continuous casting and continuous rolling processes of sheet billets. The method mainly comprises the technical processes of smelting, refining, continuous casting of sheet billets, soaking, hot continuous rolling, cooling and coiling. The superheat degree T(superheat) of molten steel is greater than 30 DEG C and less than or equal to 45 DEG C, the charging temperature T(charging) of casting billets is greater than or equal to 900 DEG C and less than or equal to 1050 DEG C, the finishing temperature T(finishing) is greater than or equal to 850 DEG C and less than or equal to 950 DEG C, the coiling temperature T(coiling) is greater than or equal to 550 DEG C and less than or equal to 630 DEG C, and the pulling speed S(pulling) of continuous casting is greater than or equal to 3.5m / min and less than or equal to 5.5m / min; covering slag is used for casting; and the molten steel comprises the following chemical components: 0.70-0.80 of C, 0.20-0.45 of Si, 0.60-0.90 of Mn, less than or equal to 0.025 of P, less than or equal to 0.025 of S, 0.30-0.60 of Cr and 0.02-0.08 of V. The 8CrV2 hot-rolled sheet steel prepared by the method of the invention reduces the segregation, loosen and cracks of the casting billets, and has the characteristics of uniform structure property and high fatigue resistance.

Description

technical field [0001] The invention belongs to the technical field of alloy tool steel production, and is particularly suitable for a method for producing 8CrV2 hot-rolled steel plates by adopting thin slab continuous casting and rolling processes. technical background [0002] 8CrV2 alloy tool steel has the advantages of high hardness, toughness, wear resistance, good hardenability, not easy to decarburize, good surface quality, etc. This alloy tool steel is an indispensable product for saw blades, special tools and springs. Compared with silicon-manganese alloy structural steel, 8CrV2 has better hardenability due to the addition of Cr, and at the same time, adding V makes the grain refinement, ensuring that it still has a higher elastic limit and tensile limit at high temperatures. And it has the advantages of not easy decarburization, good surface quality and high fatigue resistance. [0003] The production of 8CrV2 hot-rolled steel plates has the following main problem...

Claims

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Application Information

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IPC IPC(8): C22C38/24B21B1/46B21B37/74
Inventor 毛新平陈景浒李轲新
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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