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Method for producing SKS51 hot-rolled thin steel sheets

A technology of hot-rolled thin steel sheet and production method, applied in metal rolling, temperature control and other directions, can solve the specific solution method that does not mention SKS51 preparation technology and method, does not mention key technical problems, and does not mention alloy tools Steel technology and methods, etc., to achieve the effect of improving the quality of the slab, high drawing speed, and improving the uniformity of structure and properties

Inactive Publication Date: 2010-06-23
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to not mentioning the specific technology and method of alloy tool steel in the above application, there is also no mention of specific solutions to the key technical problems existing in the production process of alloy tool steel, especially the preparation technology and method of SKS51

Method used

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  • Method for producing SKS51 hot-rolled thin steel sheets
  • Method for producing SKS51 hot-rolled thin steel sheets
  • Method for producing SKS51 hot-rolled thin steel sheets

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for producing SKS51 hot-rolled thin 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.

[0029] The chemical composition weight percentage ratio (wt%) of the molten steel after the alloying treatment in the refining process is: C: 0.75, Si: 0.15, Mn: 0.20, P0.010, S0.004, Cr: 0.20, Ni: 1.30, The remainder is Fe and unavoidable impurities.

[0030] Slab entering furnace temperature T 入is 905°C, the superheat of molten steel T 过 31°C, finishing temperature T 终 860°C, coiling temperature T 卷 560°C, casting speed S 拉 3.5m / min, continuous casting liquid core depression 2mm, slab thickness 68mm.

[0031] The physical and chemical performance indicators of mold flux: the melting point is 1016°C, the basicity is 1.01, the vis...

Embodiment 2

[0036] A method for producing SKS51 hot-rolled thin 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.

[0037] The chemical composition weight percentage ratio (wt%) of the molten steel after the alloying treatment in the refining process is: C0.85, Si0.30, Mn0.50, P0.028, S0.029, Cr0.50, Ni2.0, The rest is Fe and unavoidable impurities.

[0038] 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 630℃, continuous casting casting speed S 拉 It is 5.5m / min, the continuous casting liquid core is pressed down 19mm, and the casting slab thickness is 51mm.

[0039] Physical and chemical performance indicators of mold flux: melting point is 979°C, ...

Embodiment 3

[0044] This embodiment is based on the method of producing SKS51 hot-rolled thin steel plates based on the thin slab continuous casting and rolling process. Rolling, laminar cooling, coiling.

[0045] The chemical composition weight percentage ratio (wt%) of the molten steel after the alloying treatment in the refining process is: C0.80, Si0.26, Mn0.35, P0.015, S0.009, Cr0.32, Ni1.6, The rest is Fe and unavoidable impurities.

[0046] Process parameters: billet entering furnace temperature T 入 is 935°C, the superheat of molten steel T 过 38°C, finishing temperature T 终 910°C, coiling temperature T 卷 625°C, casting speed S 拉 4.2m / min, continuous casting liquid core depression 7mm, slab thickness 63mm.

[0047] The physical and chemical performance indicators of mold flux: the melting point is 990°C, the basicity is 0.90, the viscosity is 1290°C, 0.94 poise, and the bulk density is 0.60Kg / L.

[0048] Microstructure of hot-rolled steel strip see image 3 , the performance ...

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Abstract

The invention provides a method for producing high-quality SKS51 hot-rolled thin steel sheets based on the continuous thin slab casting and rolling process, which mainly adopts the following process flow: electric furnace or converter smelting, refining, continuous thin slab casting, soaking, hot continuous rolling, laminar cooling and coiling. By weight percent, the chemical composition is as follows: 0.75 percent to 0.85 percent by weight of C, 0.30 percent by weight or less of Si, 0.50 percent by weight or less of Mn, 0.030 percent by weight or less of P, 0.030 percent by weight or less of S, 0.20 percent to 0.50 percent by weight of Cr and 1.3 percent to 2.0 percent by weight of Ni, and the rest is Fe and inevitable residual impurities. The superheat T of molten steel is larger than 30 DEG C and less than or equal to 45 DEG C, the charging temperature T of the cast slab is larger than or equal to 900 DEG C and less than or equal to 1050 DEG C, the finish rolling temperature T is larger than or equal to 850 DEG C and less than or equal to 950 DEG C, the coiling temperature T is larger than or equal to 550 DEG C and less than or equal to 630 DEG C, and the drawing speed S of continuous casting is larger than or equal to 3.5m / min and less than or equal to 5.5m / min. When the method is adopted to produce the SKS51 hot-rolled thin steel sheet, the segregation, porosity and cracks of the cast slab are reduced, and the SKS51 hot-rolled thin steel sheet is characterized by uniform microstructure and properties 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 SKS51 hot-rolled steel plates by adopting thin slab continuous casting and rolling processes. technical background [0002] Alloy tool steel SKS51 (C content 0.75-0.83Wt.%) has high hardness, toughness and wear resistance, and is mainly used in the manufacture of high-end high-grade alloy tools, including high-precision circular saw blades, special tools / cutters and special springs and other fields. The base material of alloy tools needs to have a certain strength and rigidity in order to complete the normal cutting. Due to the strong vibration in use, it is comprehensively reflected in the need for sufficient hardness, structural properties and fatigue resistance. [0003] In view of the above-mentioned characteristics, this steel type requires low phosphorus and sulfur impurity content, a small number of inclusions and...

Claims

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Application Information

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IPC IPC(8): B21B1/46C22C38/40B22D11/16B22D11/111B21B37/74
Inventor 毛新平陈景浒柴毅忠
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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