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Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof

A technology of electroslag remelting and premelting slag, which is applied in the field of electroslag refining, can solve problems such as high moisture content, unstable cleanliness of electroslag ingots, and restrictions on the technical level of high-end products, and achieve the effect of ensuring stability

Inactive Publication Date: 2014-12-10
刘天成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional heavy slag materials C, S, P, Fe and other impurities contain many impurities and high moisture content, usually the content of silicon element is above 0.6%, the cleanliness of the produced electroslag ingots is unstable, which seriously restricts the high-end product technical level

Method used

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  • Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof
  • Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof
  • Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A low-silicon and low-impurity pre-melted slag for electroslag remelting, which is composed of the following chemical components according to mass percentage: F: 28.2%, Al: 10.6%, Ca: 42.6%, O: 16.9%, Mg≤1.2%, Si ≤0.28%, Fe≤0.23%, Ti≤0.18%, C≤0.03%, P≤0.015%, S≤0.03%, H2O (measured at 650°)≤0.06%.

[0026] A method for preparing low-silicon and low-impurity pre-melted slag for electroslag remelting, comprising the following steps:

[0027] (1) Dosing ingredients according to the above composition requirements;

[0028] (2) Use an intermediate frequency furnace or an electric furnace to melt the above-mentioned chemical composition ingredients at 1500° within 3 hours, and ensure that the liquid slag is uniform and clear;

[0029] (3) Pour the uniform liquid slag into the metal mold for cooling;

[0030] (4) Use crushers and other equipment to crush and screen the cooled solid slag to ensure that the particle size is within 15mm;

[0031] (5) Vacuum packaging with alum...

Embodiment 2

[0034] A low-silicon and low-impurity pre-melted slag for electroslag remelting is composed of the following chemical components according to mass percentage:

[0035] F: 32.6%, Al: 7.9%, Ca: 45.8%, O: 12.6%, Mg≤0.9%, Si≤0.28%, Fe≤0.23%, Ti≤0.18%, C≤0.03%, P≤0.015%, S≤0.03%, H2O (measured at 650° temperature)≤0.06%.

[0036] A method for preparing low-silicon and low-impurity pre-melted slag for electroslag remelting, comprising the following steps:

[0037] (1) Dosing ingredients according to the above composition requirements;

[0038] (2) Use an intermediate frequency furnace or an electric furnace to melt the above-mentioned chemical composition and ingredients at 1350° within 2 hours, and ensure that the liquid slag is uniform and clear;

[0039] (3) Pour the uniform liquid slag into the metal mold for cooling;

[0040] (4) Use crushers and other equipment to crush and screen the cooled solid slag to ensure that the particle size is within 15mm;

[0041] (5) Vacuum pa...

Embodiment 3

[0044] A low-silicon and low-impurity pre-melted slag for electroslag remelting is composed of the following chemical components in terms of mass percentages:

[0045] F: 24.3%, Al: 10.5%, Ca: 45.0%, Mg: 1.8%, O: 17.8%, Si≤0.28%, Fe≤0.23%, Ti≤0.18%, C≤0.03%, P≤0.015%, S≤0.03%, H2O (measured at 650° temperature)≤0.06%.

[0046] A method for preparing low-silicon and low-impurity pre-melted slag for electroslag remelting, comprising the following steps:

[0047] (1) Dosing ingredients according to the above composition requirements;

[0048] (2) Use an intermediate frequency furnace or an electric furnace to melt the above chemical composition and ingredients at 1600° within 4.5 hours, and ensure that the liquid slag is uniform and clear;

[0049] (3) Pour the uniform liquid slag into the metal mold for cooling;

[0050] (4) Use crushers and other equipment to crush and screen the cooled solid slag to ensure that the particle size is within 10mm;

[0051] (5) Vacuum packagin...

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Abstract

The invention provides low-silicon and low-impurity pre-melting slag for electro-slag remelting through the optimal design of a formula scheme and a technical preparing method of pre-melting slag. The low-silicon and low-impurity pre-melting slag consists of 24-34% of F, 35-58% of Ca, 6-19% of Al, 0-3% of Mg, 10-26% of O and not more than 0.28% of Si in percentage by mass. The granularity is distributed between 0 and 15mm. The preparing method comprises the processing steps of mixing, electric furnace smelting, cooling, crushing, granularity sieving and aluminum foil vacuum packaging. The low-silicon electro-slag re-melting slag has low impurity content and even ingredients and can meet the electro-slag re-melting technical requirements of various high-temperature alloys and special steel, such as stainless steel.

Description

technical field [0001] The invention relates to the technical field of electroslag refining, and also relates to a preparation process of low-silicon and low-impurity pre-melted slag for electroslag remelting of special steel types such as high-temperature alloys and stainless steel. Background technique [0002] In the electroslag remelting process, the consumable electrode is remelted in the liquid slag pool, and the metal material with high purity and uniform structure is produced through a water-cooled crystallizer. The liquid metal droplets formed at the end of the consumable electrode pass through the active liquid slag pool, and impurity elements such as sulfur and oxygen and non-metallic inclusions are filtered and absorbed by the slag. After this, the pure metal slag enters the liquid metal bath, and then solidifies and takes shape in a water-cooled crystallizer at a controlled solidification rate. It can be seen that electroslag remelting is an effective way to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor 刘天成
Owner 刘天成
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