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Production method for controlling isometric crystal of high-alloy heat-resistant stainless steel continuous casting billet

A technology of heat-resistant stainless steel and continuous casting slabs, which is applied in the field of axial grain control, can solve the problems that high-alloy heat-resistant stainless steel cannot be used, and achieve the effects of stable slab quality, uniform structure, and stable performance

Inactive Publication Date: 2021-07-13
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, no matter it is the Chinese invention patent application with the application number 201910255406.7 or the Chinese invention patent application with the application number 201610170036.3, the disclosed method is not a high-alloy stainless steel slab equiaxed crystal control method, especially, due to the 1Cr25Ni20Si2 high alloy resistant Due to the unique properties of hot stainless steel, the methods disclosed in these patent applications cannot be applied to 1Cr25Ni20Si2 high-alloy heat-resistant stainless steel

Method used

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  • Production method for controlling isometric crystal of high-alloy heat-resistant stainless steel continuous casting billet
  • Production method for controlling isometric crystal of high-alloy heat-resistant stainless steel continuous casting billet
  • Production method for controlling isometric crystal of high-alloy heat-resistant stainless steel continuous casting billet

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Embodiment 1

[0041]Present embodiment 1Cr25Ni20Si2 stainless steel, the mass percent of its chemical composition is:

[0042] C: 0.065%, Si: 1.72%, Mn: 1.30%, P: 0.025%, S: 0.002%, Cr: 25.20%, Ni: 19.30%, and the rest are Fe and unavoidable impurities.

[0043] The billet specification of this embodiment is 200mm * 1250mm.

[0044] This embodiment includes the following steps:

[0045] Ⅰ Tundish molten steel superheat

[0046] Control the average superheat degree of tundish steel level to 23°C.

[0047] Ⅱ Casting speed

[0048] The pulling speed is controlled by 1.10m / min.

[0049] Ⅲ Control of Mold Cooling Intensity

[0050] The cooling water for the wide side of the crystallizer is 4100L / min, and the cooling water for the narrow side of the crystallizer is 370L / min.

[0051] Ⅳ Electromagnetic Stirring Parameter Selection

[0052] Electromagnetic stirring parameters are: current 1300A, frequency 1.5Hz.

[0053] The slab obtained in this embodiment is as figure 2 shown. Depend o...

Embodiment 2

[0056] Present embodiment 1Cr25Ni20Si2 stainless steel, the mass percent of its chemical composition is:

[0057] C: 0.055%, Si: 1.63%, Mn: 1.22%, P: 0.025%, S: 0.001%, Cr: 25.12%, Ni: 19.18%, and the rest are Fe and unavoidable impurities.

[0058] The billet specification of this embodiment is 200mm * 1500mm.

[0059] The embodiment of the method for controlling high-alloy heat-resistant stainless steel 1Cr25Ni20Si2 continuous casting slab equiaxed crystal comprises the following steps in sequence:

[0060] Ⅰ Tundish molten steel superheat

[0061] Control the average superheat degree of tundish steel level to 18°C.

[0062] Ⅱ Casting speed

[0063] The pulling speed is controlled by 1.00m / min

[0064] Ⅲ Control of Mold Cooling Intensity

[0065] The cooling water for the wide side of the crystallizer is 4000L / min, and the cooling water for the narrow side of the crystallizer is 350L / min.

[0066] Ⅳ Electromagnetic Stirring Parameter Selection

[0067] Electromagnetic...

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Abstract

The invention provides a production method for controlling isometric crystal of a high-alloy heat-resistant stainless steel continuous casting billet. The production method comprises the following steps: (1) controlling the superheat degree of tundish molten steel to be 15-25 DEG C; (2) inputting the tundish molten steel into a crystallizer with preset cooling strength and electromagnetic stirring parameters, and cooling the tundish molten steel to form a casting blank; and (3) outputting the casting blank according to the preset pulling speed. By means of the method, the isometric crystal proportion of the casting blank can reach 70% or above, the quality of the produced casting blank is stable, and the interior of the casting blank is free of looseness, air holes and layering defects.

Description

technical field [0001] The invention relates to the technical field of continuous casting of high-alloy heat-resistant stainless steel, in particular to a method for controlling equiaxed crystals of high-alloy heat-resistant stainless steel continuous casting slabs. Background technique [0002] 1Cr25Ni20Si2 is a high-alloy austenitic heat-resistant stainless steel with high structural stability, good high-temperature oxidation resistance, high creep strength and durable strength, and good high-temperature plasticity. It is widely used in high-temperature components such as boilers. [0003] However, the 1Cr25Ni20Si2 alloy has high content, poor thermal conductivity, and coarse equiaxed grains of continuous casting slabs. During the production process, columnar crystals of continuous casting slabs often develop, resulting in defects such as loose cores of slabs. In severe cases, slabs are delaminated, such as figure 1 shown. [0004] The Chinese invention patent application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/112B22D11/115B22D11/22
CPCB22D11/112B22D11/115B22D11/22
Inventor 范新智李国平苗华军秦宇航
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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