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A method for preventing silicon increase in low-silicon steel during electroslag remelting

A technology of electroslag remelting and low-silicon steel, which is applied in the direction of improving process efficiency, etc., can solve problems such as excessive Si content, silicon increase in steel ingots, and reduced yield, and achieve the effect of stable quality

Active Publication Date: 2018-07-24
SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, many heat-resistant steels have very low requirements on the control of silicon content (such as Si≤0.1% or even lower), and in the current smelting process, Si and Al are basically used as deoxidizers in steelmaking, resulting in the steelmaking It is difficult to control the silicon content
The fluorite powder used in the subsequent electroslag remelting also contains a certain amount of silicon, which will easily lead to the increase of silicon in the steel ingot during electroslag remelting, making the Si content exceed the standard, resulting in waste products, reducing the yield and increasing the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for preventing low-silicon steel from increasing silicon during electroslag remelting, comprising the following steps:

[0015] (1) Preparation of slag, which is composed of the following components: CaF 2 : 62kg, Al 2 o 3 : 23kg, CaO: 12kg, MgO: 3kg;

[0016] (2) Use the slag obtained in step (1) to remelt the pure iron electrode. Add 300g of Al powder to the slag when melting the slag. During the remelting process, add Al powder continuously. The amount of Al powder added is controlled at 3g / 5min. Stop smelting when melting 500Kg pure iron steel ingot, and the resulting material is made into ultra-low silicon slag;

[0017] (3) After crushing and baking the slag obtained in step (2), remelt the required low-silicon steel electrode rod, and continuously add Al powder and Ca-Si powder (70 mass% Si , 30% by mass of Ca), the amount of Al powder added is controlled at 5g / 5min, and the amount of Ca-Si powder added is controlled at 6g / 5min.

[0018] The electro...

Embodiment 2

[0020] A method for preventing low-silicon steel from increasing silicon during electroslag remelting, comprising the following steps:

[0021] (1) Preparation of slag, which is composed of the following components: CaF 2 : 58kg, Al 2 o 3 : 27kg, CaO: 8kg, MgO: 7kg;

[0022] (2) Use the slag obtained in step (1) to remelt the pure iron electrode. Add 200g of Al powder to the slag when melting the slag. During the remelting process, add Al powder continuously. The amount of Al powder added is controlled at 1g / 5min. Stop smelting when melting 300Kg pure iron steel ingot, and the obtained ultra-low silicon slag material;

[0023] (3) After crushing and baking the slag obtained in step (2), remelt the required low-silicon steel electrode rod, and continuously add Al powder and Ca-Si powder (70 mass% Si , 30% by mass of Ca), the amount of Al powder added is controlled at 2g / 5min, and the amount of Ca-Si powder added is controlled at 3g / 5min.

[0024] The electrode rod with a s...

Embodiment 3

[0026] A method for preventing low-silicon steel from increasing silicon during electroslag remelting, comprising the following steps:

[0027] (1) Preparation of slag, which is composed of the following components: CaF 2 : 60kg, Al 2 o 3 : 25kg, CaO: 10kg, MgO: 5kg;

[0028] (2) Use the slag obtained in step (1) to remelt the pure iron electrode. Add 250g of Al powder to the slag when melting the slag. During the remelting process, add Al powder continuously. The amount of Al powder added is controlled at 2g / 5min. Stop smelting when melting 400Kg pure iron steel ingot, and the obtained ultra-low silicon slag material;

[0029] (3) After pulverizing and baking the slag obtained in step (2), remelt the required low silicon steel electrode rod, add Al powder and Ca-Si powder continuously during the remelting process, and the amount of Al powder added The control is 3g / 5min, and the amount of Ca-Si powder added is controlled at 5g / 5min.

[0030] The electrode rod with a sili...

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PUM

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Abstract

The invention discloses a method for preventing silicon increase in low-silicon steel during electroslag remelting and belongs to the technical field of electroslag remelting. The method comprises the following steps: (1), preparing slag from the following components according to percent by weight: 58-62% of CaF2, 23-27% of Al2O3, 8-12% of CaO and 3-7% of MgO; (2), remelting a pure-iron electrode with the slag obtained in step (1), adding 200-300 g of Al powder into slag during slag melting, continuously adding Al powder during remelting, and stopping smelting if 300-500 Kg of pure-iron steel ingots are remelted to obtain ultralow-silicon slag; crushing and baking the slag obtained in step (2), remelting again electrode bars for the required low-silicon steel, and continuously adding Al powder and Ca-Si powder during remelting; by producing the low-silicon steel through electroslag remelting according to the method, it is possible to ensure Si < / =0.1%, stable quality and qualification of other components, and product qualification ratio is up to above 99%.

Description

technical field [0001] The invention belongs to the technical field of electroslag remelting, and in particular relates to a method for preventing low-silicon steel from increasing silicon during electroslag remelting. Background technique [0002] At present, many heat-resistant steels have very low requirements on the control of silicon content (such as Si≤0.1% or even lower), and in the current smelting process, Si and Al are basically used as deoxidizers in steelmaking, resulting in the steelmaking It is difficult to control the silicon content. The fluorite powder used in the subsequent electroslag remelting also contains a certain amount of silicon, which will easily lead to the increase of silicon in the steel ingot during electroslag remelting, making the Si content exceed the standard, resulting in waste products, reducing the yield and increasing the cost. Contents of the invention [0003] The object of the present invention is to provide a method for preventin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18C21C7/076
CPCC21C7/0006C21C7/0037C21C7/076C22B9/18Y02P10/20
Inventor 李建雷德江黄志永刘永新张华国丁勇高刚毅
Owner SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL