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Electroslag remelting quaternary slag system for preparing high-purity stainless steel

A technology of electroslag remelting and quaternary slag, applied in the field of electroslag, can solve the problems affecting the internal quality of military products and difficult to meet the requirements of technical indicators, so as to reduce the content of non-metallic inclusions, low use cost, easy-to-achieve effects

Inactive Publication Date: 2010-05-12
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electroslag system used in the prior art is difficult to meet the requirements of technical indicators such as non-metallic inclusions in steel for super (super) critical units, nuclear power materials and some military steel
For example: 1Cr12Ni3MoVN steel, the material of Spey series used in military industry, the pass rate of purity inspection is only about 44%, which seriously affects the inherent quality of this series of military products

Method used

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  • Electroslag remelting quaternary slag system for preparing high-purity stainless steel
  • Electroslag remelting quaternary slag system for preparing high-purity stainless steel

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0018] Using the quaternary slag system of the present invention to prepare high-purity 12% Cr stainless steel electroslag remelting steel ingots comprises the following steps:

[0019] The first step, the preparation of metal electrodes:

[0020] The source of metal electrodes is the key to whether the electroslag furnace can be produced. In this embodiment, metal electrodes of various specifications for electroslag remelting are obtained by using "electric arc furnace + refining outside the furnace" smelting, and using the down casting method, and the electrode specifications are 1.1 to 1.3 tons per piece;

[0021] a. The chemical composition and weight percentage composition of consumable electrodes should meet the following requirements:

[0022] C 0.08~0.15%, Mn 0.50~0.90%, Si≤0.25%, S≤0.015%, P≤0.020%, Ni 2.00~3.00%, Cr 11.00~12.50%, Mo 1.50~2.00%, V 0.25~0.40% , N0.020~0.040%, the balance is Fe; residual element requirements: Ti≤0.020%, Al≤0.020%, Cu≤0.10%, Sn≤0.015%,...

Embodiment 2～6

[0034] The quaternary slag system of the present invention is used to prepare high-purity 12% Cr stainless steel electroslag remelting steel ingots, and the slag composition and weight percentage examples of the quaternary slag system are shown in the following table:

[0035]

[0036] Others are the same as those described in Embodiment 1 or the contents of the present invention, omitted.

[0037] Adopt the method described in the embodiment of the present invention 1 or the content of the present invention part, the super (super) critical material 1Cr12Ni3Mo2VN steel [steam turbine super (super) critical material] of production, detect the data of the nonmetallic inclusion of super (super) critical material See Table 1:

[0038] Table 1: Non-metallic inclusions in super(super)critical material 1Cr12Ni3Mo2VN steel

[0039]

[0040] Note: 1. The value of "Qualified Requirements" in Table 1 is the value required by the enterprise standard, and the inspection method is ba...

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Abstract

The invention discloses an electroslag remelting quaternary slag system for preparing high-purity stainless steel. The electroslag remelting quaternary slag system is characterized by comprising the following compositions in percentage by weight: 50 to 65 percent of CaF2, 20 to 25 percent of Al2O3, 10 to 25 percent of CaO and 0 to 5 percent of MgO. The quaternary slag system is adopted for electroslag remelting, can effectively reduce the non-metallic inclusion content of the steel and improves the purity of the steel under the condition of non-protective atmosphere and has the characteristics of little investment, low use cost and easy realization.

Description

technical field [0001] The invention relates to an electroslag system used in metal electroslag remelting, and relates to an electroslag remelting quaternary slag system used for preparing high-purity stainless steel. It is mainly suitable for electroslag remelting of high-purity 12% Cr series stainless steel, etc., to meet the requirements of technical indicators such as non-metallic inclusions in super (super) critical units, nuclear power materials and some military steels. Background technique [0002] With the rapid development of the electric power industry, the steel used for domestic steam turbine units and the capacity of the unit have increased significantly, and the requirements for the comprehensive performance of the steel used for steam turbine units have become higher and higher. Domestic steam turbine factories have imported a large number of super (ultra)critical steam turbine units from abroad. For steel, its inspection is completely in accordance with fore...

Claims

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Application Information

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IPC IPC(8): C22B9/18
Inventor 丁勇张健罗通伟朱小阳王强孙文玲杨再春邝素军田小辉宋宁秋陈晋阳
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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