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Electroslag remelting slag system for duplex stainless steel

A technology of duplex stainless steel and electroslag remelting, which is applied in the field of metallurgical auxiliary materials, can solve problems such as electroslag remelting process that is not suitable for super duplex stainless steel, and achieve improved chemical stability, increased strength and toughness, and strong deoxidation and desulfurization effect

Pending Publication Date: 2019-07-19
JIANGSU XIHU SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional electroslag remelting slag system, such as 30% Al 2 o 3 +70%CaF 2 , 60%CaF 2 +20%CaO+20%Al 2 o 3 and other general slag systems cannot meet the above requirements, and are not suitable for the electroslag remelting process of super duplex stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The mass percentage of the chemical composition of the electroslag remelting slag system for the duplex stainless steel of the present embodiment is: CaF 2 56.5%, Al 2 o 3 10.70%, CeO 2 8.5%, CaO 17.6%, MgO 3.5%, SiO 2 2.40%, the rest are impurities, the impurity content is 0.80%, the quaternary alkalinity of the slag system (CaO+MgO) / (SiO 2 +Al 2 o 3 ) is 1.61.

[0034] The melting temperature of the slag system is 1395°C, at 1500°C, the viscosity of the slag system is 0.024Pa·S, and the conductivity is 0.243Ω -1 cm -1 , The melting rate is 42g / S.

[0035]The preparation method of this slag system is: using fluorite, industrial alumina, industrial cerium oxide, lime, fused magnesia and silica as raw materials, among which the CaF in fluorite powder 2 The purity is more than 97%, Al in industrial alumina 2 o 3 The purity is more than 96%, CeO in cerium oxide for industrial use 2 The purity of CaO in lime is above 95%, the purity of MgO in fused magnesia i...

Embodiment 2

[0044] The mass percentage of the chemical composition of the electroslag remelting slag system for the duplex stainless steel of the present embodiment is: CaF 2 53.80%, Al 2 o 3 13.30%, CeO 2 7.20%, CaO 18.50%, MgO 4.0%, SiO 2 2.70%, the rest are impurities, the impurity content is 0.50%, the quaternary alkalinity of the slag system (CaO+MgO) / (SiO 2 +Al 2 o 3 ) is 1.40.

[0045] The melting temperature of the slag system is 1380°C, at 1500°C, the viscosity of the slag system is 0.033Pa·S, and the conductivity is 0.287Ω -1 cm -1 , The melting rate is 46g / S.

[0046] The preparation method of this slag system is: using fluorite, industrial alumina, industrial cerium oxide, lime, fused magnesia and silica as raw materials, among which the CaF in fluorite powder 2 The purity is more than 97%, Al in industrial alumina 2 o 3 The purity is more than 96%, CeO in cerium oxide for industrial use 2 The purity of CaO in lime is above 95%, the purity of MgO in fused magnes...

Embodiment 3

[0055] The mass percentage of the chemical composition of the electroslag remelting slag system for the duplex stainless steel of the present embodiment is: CaF 2 50.40%, Al 2 o 3 14.50%, CeO 2 7.50%, CaO 19.50%, MgO 4.60%, SiO 2 2.90%, the rest are impurities, the impurity content is 0.60%, the quaternary alkalinity of the slag system (CaO+MgO) / (SiO 2 +Al 2 o 3 ) is 1.39.

[0056] The melting temperature of the slag system is 1386°C. At 1500°C, the viscosity of the slag system is 0.027Pa·S and the conductivity is 0.292Ω. -1 cm -1 , The melting rate is 53g / S.

[0057] The preparation method of this slag system is: using fluorite, industrial alumina, industrial cerium oxide, lime, fused magnesia and silica as raw materials, among which the CaF in fluorite powder 2 The purity is more than 97%, Al in industrial alumina 2 o 3 The purity is more than 96%, CeO in cerium oxide for industrial use 2 The purity of CaO in lime is above 95%, the purity of MgO in fused magne...

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Abstract

The invention discloses an electroslag remelting slag system for duplex stainless steel. The electroslag remelting slag system is prepared from the following components in percent by weight: 50.0-65.0% of CaF2, 8.0-15.0% of Al2O3, 3.0-10.0% of CeO2, 15.0-20.0% of CaO, 3.0-5.0% of MgO, 1.0-3.0% of SiO2 and the balance impurities which are not more than 1%. According to the slag system, the slag viscosity changes gently as the temperature is reduced, and the high temperature plasticity and the strength of slag can be also improved, so that bleed-out and slag leakage are prevented. The conductivity of the slag can be reduced, the chemical stability of the slag can be improved, and the system has better deoxidizing and desulfurizing effects and inclusion absorption action, thereby playing a role of purifying molten steel deeply. As-cast grains can be refined, and the strength and the toughness of steel are improved. The electroslag remelting slag system is uniform to transfer heat and goodin lubricating effect, and the slag layer is kept stable and is melted uniformly.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary materials, and in particular relates to an electroslag remelted slag system for duplex stainless steel, a preparation method and a use method thereof. Background technique [0002] In recent years, with the rapid development of a series of industries such as my country's nuclear power, petrochemical and deep-sea oil and gas development, the requirements for corrosion resistance, high temperature strength and creep performance of various alloy pipes have greatly increased. Materials such as heat-resistant steel can no longer meet the needs of actual production, and super duplex stainless steel is an ideal material for making the above-mentioned pipes. [0003] Super duplex stainless steel is a kind of duplex stainless steel containing higher mass fractions of chromium, molybdenum and nitrogen than super duplex stainless steel, with higher strength and better corrosion resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C33/04
CPCC22B9/18C22C33/04Y02P10/20
Inventor 翟海平刘晓翟素萍王庆李花兵都祥元赵酿赵华东
Owner JIANGSU XIHU SPECIAL STEEL
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