Ultra pure electroslag remelting method for high-performance corrosion resistant alloy

A corrosion-resistant alloy and electroslag remelting technology, applied in the field of metallurgical smelting, can solve the problems of low yield of hot working, poor high temperature thermoplasticity, uneven structure, etc., and achieve the effect of good hot working performance, good performance and structure optimization.

Active Publication Date: 2013-02-06
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high alloy content, high-performance corrosion-resistant alloys have serious segregation, especially for large-scale products. The common electroslag remelting process is prone to severe segregation, resulting in uneven structure and easy precipitation of σ-brittle phases, especially in the thermal processing temperature zone.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The ultra-pure electroslag remelting method of high-performance corrosion-resistant alloy has the following steps:

[0021] a) Preparation of self-fusing electrode rod

[0022] Calculated on the basis of the total weight of each furnace of 3000kg, the ingredients of the high-performance corrosion-resistant alloy self-fluxing electrode rod are calculated by weight percentage: Ni: 29%, Cr: 28%, Mo: 3%, Fe: 40%, after vacuum induction Smelting, casting into Φ450mm round rod, after sanding and finishing the surface of the round rod, it is a self-melting electrode rod for electroslag remelting;

[0023] b) Electroslag remelting

[0024] The slag material for electroslag remelting is calculated according to the amount of 150kg per furnace, and the proportion is calculated by weight percentage: CaF 2 : 75%, CaO: 5%, Al 2 o 3 : 15%, MgO: 5%, specially used for electroslag remelting of this high-performance corrosion-resistant alloy. The above-mentioned slag is heated to a m...

Embodiment 2

[0028] A method for ultra-pure electroslag remelting of high-performance corrosion-resistant alloys, comprising the following steps:

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

[0030] Based on the total weight of each furnace of 3000kg, the ingredients of the high-performance corrosion-resistant alloy self-fluxing electrode rod are calculated by weight percentage: Ni: 25%, Cr: 26%, Mo: 4.5%, Fe: 44.5%, after vacuum induction Smelting, casting into Φ350mm round rod, after sanding and finishing the surface of the round rod, it is a self-melting electrode rod for electroslag remelting;

[0031] b) Electroslag remelting

[0032] The slag material for electroslag remelting is calculated according to the amount of 150kg per furnace, and the proportion is calculated by weight percentage: CaF 2 : 60%, CaO: 25%, Al 2 o 3 : 5%, MgO: 10%, specially used for electroslag remelting of this high-performance corrosion-resistant alloy. The above-mentioned slag is heated to a mol...

Embodiment 3

[0036] A method for ultra-pure electroslag remelting of a high-performance corrosion-resistant alloy, comprising the following steps:

[0037] a) Preparation of self-fusing electrode rod

[0038] Calculated based on the total weight of each furnace of 3000kg, the ingredients of the high-performance corrosion-resistant alloy self-fluxing electrode rod are calculated by weight percentage: Ni: 33%, Cr: 27%, Mo: 2.5%, Fe: 37.5%, after vacuum induction Smelting, casting into Φ300mm round rod, after sanding and finishing the surface of the round rod, it is a self-melting electrode rod for electroslag remelting;

[0039] b) Electroslag remelting

[0040] The slag material for electroslag remelting is calculated according to the amount of 150kg per furnace, and the proportion is calculated by weight percentage: CaF 2 : 70%, CaO: 15%, Al 2 o 3 : 10%, MgO: 5%, specially used for electroslag remelting of this high-performance corrosion-resistant alloy. The above-mentioned slag is heate...

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PUM

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Abstract

The invention relates to an ultra pure electroslag remelting method for a high-performance corrosion resistant alloy, and the method comprises the following steps of: preparing the following ingredient components of a self-fluxing electrode bar in parts by weight: 25-34 parts of Ni, 25-29 parts of Cr, 2.5-4.5 parts of Mo and 30-45 parts of Fe, and carrying out vacuum induction melting, so as to obtain the self-fluxing electrode bar; slowly melting the self-fluxing electrode bar in melted electroslag remelting slag charge comprising the following components in parts by weight: 55-80 parts of CaF2, 5-25 parts of CaO, 5-15 parts of Al2O3 and 5-10 parts of MgO, purifying, and recrystallizing in a crystallizer, so as to obtain an electroslag ingot; and forging the electroslag ingot into a bar material at the temperature of 1130+/-5 DEG C, and carrying out solution treatment, so that the high-performance corrosion resistant alloy is obtained. By utilizing the ultra pure electroslag remelting method provided by the invention, the content of harmful elements such as sulphur and phosphorus in the alloy can be reduced, the impurity distribution of the alloy is improved, fining of structure can be facilitated, and the hot workability and yield of the alloy can be improved.

Description

technical field [0001] The invention relates to the field of metallurgical smelting, in particular to an ultra-pure electroslag remelting method for high-performance corrosion-resistant alloys. Background technique [0002] High-performance corrosion-resistant alloys used in the field of oil and gas exploration and production refer to those alloys that can meet the needs of deep sea and deep well oil and gas fields, and have excellent comprehensive properties such as mechanics and corrosion resistance, and at the same time have the ability to resist H 2 S, CO 2 , Cl - A cost-effective alloy for comprehensive strong acid corrosion. Due to the high alloy content, high-performance corrosion-resistant alloys have serious segregation, especially for large-scale products. The common electroslag remelting process is prone to severe segregation, resulting in uneven structure and easy precipitation of σ-brittle phases, especially in the thermal processing temperature zone. The ran...

Claims

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Application Information

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IPC IPC(8): C22B9/18
CPCY02P10/25
Inventor 王方军魏捍东万红贺文海刘海定罗维凡王东哲
Owner CHONGQING MATERIALS RES INST
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