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Super-pure electro-slag remelting method for super-invar alloy

An invar and electroslag remelting technology, applied in the field of metal materials, can solve the problems of reducing the forging yield, difficult forging success, etc., and achieve the effects of improving the yield, increasing the unit weight, and small thermal expansion coefficient

Active Publication Date: 2011-07-20
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impact is more significant for super-Invar alloys. Reasonable electroslag remelting process improves the hot workability of the alloy and greatly increases the yield, which is beneficial to the expansion of the alloy and other properties; inappropriate processes seriously reduce the yield of forging, and even make it difficult forging success

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for ultra-pure electroslag remelting of super-Invar alloy, characterized in that it comprises the following steps:

[0023] a), Preparation of self-fusing electrode rod

[0024] The ingredients of Super Invar alloy self-fluxing electrode rods are: Ni32%, Co4%, Fe64%, with a total weight of 30kg. After vacuum induction melting, it is cast into a round rod with a diameter of 110mm; after the surface is sanded and finished, it is used as Electroslag remelting self-fusing electrode rod;

[0025] b), electroslag remelting

[0026] The slag ratio of electroslag remelting is by weight: CaF 2 : CaO 2 :Al 2 o 3 =50:30:20, specially used for electroslag remelting of super invar (Super invar) alloy, the above-mentioned slag is heated to a molten state, poured into a crystallizer with a diameter of 160mm, and the self-melting electrode rod prepared in step a Slowly descend into the molten electroslag remelting slag, adjust the remelting voltage to 42V and current to ...

Embodiment 2

[0028] A method for ultra-pure electroslag remelting of super-Invar alloy, characterized in that it comprises the following steps:

[0029] a), Preparation of self-fusing electrode rod

[0030] The ingredients of Super Invar alloy self-melting electrode rods are: Ni33%, Co4.5%, Fe62.5%, with a total weight of 500kg. After vacuum induction melting, it is cast into a round rod with a diameter of 170mm; the surface is finely ground After trimming, it is used as a self-fusing electrode rod for electroslag remelting;

[0031] b), electroslag remelting

[0032] The slag ratio of electroslag remelting is by weight: CaF 2 : CaO 2 :Al 2 o 3 =60:20:20, specially used for electroslag remelting of super invar (Super invar) alloy, the above-mentioned slag is heated to a molten state, poured into a crystallizer with a diameter of 280mm, and the self-fusing electrode rod prepared in step a Slowly descend into the molten electroslag remelting slag, adjust the remelting voltage to 52V an...

Embodiment 3

[0034] A method for ultra-pure electroslag remelting of super-Invar alloy, characterized in that it comprises the following steps:

[0035] a), Preparation of self-fusing electrode rod

[0036] The ingredients of Super Invar alloy self-fluxing electrode rods are: Ni34%, Co3.5%, Fe62.5%, with a total weight of 500kg. After vacuum induction melting, it is cast into a round rod with a diameter of 220mm; the surface is finely ground After trimming, it is used as a self-fusing electrode rod for electroslag remelting;

[0037] b), electroslag remelting

[0038] The slag ratio of electroslag remelting is by weight: CaF 2 : CaO 2 :Al 2 o 3=80:15:5, specially used for electroslag remelting of super invar (Super invar) alloy, the above-mentioned slag is heated to a molten state, poured into a crystallizer with a diameter of 320mm, and the self-melting electrode rod prepared in step a Slowly descend into the molten electroslag remelting slag, adjust the remelting voltage to 42V and...

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Abstract

The invention discloses a super-pure electro-slag remelting method for a super-invar alloy, which comprises the following steps of: a) preparing a self-melting electrode rod, namely performing vacuum induction melting on the components of the self-melting electrode rod of the super-invar alloy: 32 to 34 weight parts of Ni, 3.5 to 5.5 weight parts of Co and 60.5 to 64.5 weight parts of Fe, and casting to obtain a round rod, namely the self-melting electrode rod for electro-slag remelting; and b) performing electro-slag remelting, namely heating slag for electro-slag remelting, which is prepared from 40 to 85 weight parts of CaF2, 10 to 30 weight parts of GaO2 and 30 to 5 weight parts of Al2O3 into a melted state, pouring into a crystallizer, descending the self-melting electrode rod into the melted slag for electro-slag remelting, ensuring that liquid drops of the melted self-melting electrode rod pass through the melted slag layer and react with the slag, recrystallizing purified steel liquid at the bottom of the crystallizer to obtain an electro-slag ingot, forging to obtain a black rod, and performing solid solution and stabilization treatment to obtain the super-invar alloy. The purity of the super-invar alloy is improved, the structure is optimized, the thermal expansion coefficient is smaller, the processability of the alloy is improved, and the yield of a product is greatly improved.

Description

[0001] technology field [0002] The invention relates to a metal material, in particular to a super-invar alloy ultra-pure electroslag remelting method. Background technique [0003] Super Invar alloy refers to a metal material with an extremely low thermal expansion coefficient at a certain temperature. Its ultra-low expansion performance comes from a material with a large positive spontaneous volume magnetostriction below the Curie point. The hysteresis elongation offsets the The normal lattice shrinks, resulting in almost zero expansion at room temperature. Super Invar alloy is mainly used in precision instruments and measurement fields, and its ultra-low expansion coefficient is the basis for processing accuracy and precision measurement. The expansion coefficient of super Invar alloy can reach 0.1×10 -6 Below, while the expansion coefficients of general metals and metal compounds are 1×10 -5 Above, so impurities have a great influence on the performance of Super Invar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
CPCY02P10/25
Inventor 魏捍东王东哲祁宏张中美孙威贺文海
Owner CHONGQING MATERIALS RES INST
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