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Smelting process for controlling aluminum increase at tail end of electroslag ingot in electroslag remelting process

A technology of electroslag remelting and electroslag ingot, which is applied in the field of electroslag metallurgy and can solve the problems of increasing aluminum at the end of electroslag ingot

Inactive Publication Date: 2020-09-04
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to solve the shortcomings of the existing electroslag production and provide a control electroslag remelting that can effectively solve the problem of increasing aluminum at the end of the electroslag ingot and provide a basic guarantee for the improvement of the subsequent performance of the electroslag ingot. The smelting process of adding aluminum at the end of the electroslag ingot replaces the traditional graphite electrode thermal ignition slagging, avoiding the carbon of the graphite electrode entering the slag and reacting with the calcium oxide in the slag to form calcium carbide, which is further combined with three The defect that aluminum oxide reacts to form aluminum element

Method used

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  • Smelting process for controlling aluminum increase at tail end of electroslag ingot in electroslag remelting process
  • Smelting process for controlling aluminum increase at tail end of electroslag ingot in electroslag remelting process

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Embodiment 1

[0031] Example 1: A smelting process for controlling the addition of aluminum at the end of an electroslag ingot during the electroslag remelting process, remelting 6.8 tons of steel 30CrMnSiNi2MoVE for special products, the technical agreement requires Al≤0.025%, and the ingot type specification: Φ725 / Φ790mm; slag Department: CaF 2 :Al 2 o 3 : CaO=60:20:20; slag amount: 260kg, its specific operation method is as follows:

[0032] Step 1), the slag is pre-baked before remelting, wherein the fluorite powder is baked at not less than 600°C for ≥4 hours, kept at ≥200°C, and taken as needed; alumina powder and lime are not Bake at less than 700°C for ≥4 hours, keep warm at ≥200°C, and take it as you go;

[0033] Step 2) After the spindle guard is seated, place the arc ignition agent in the center of the spindle guard, and surround the arc ignition agent with fluorite powder to ensure that a slag pool is formed as soon as possible after arcing to prevent damage to the bottom cop...

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Abstract

The invention relates to a smelting process for controlling aluminum increase at the tail end of an electroslag ingot in an electroslag remelting process. The smelting process can solve the problem ofaluminum increase at the tail end of the electroslag ingot in the electroslag remelting process, and is characterized in that a common CaF<2>-Al<2>O<3>-CaO ternary slag system is adopted so that controlling the electroslag remelting process can be carried out, an arc striking agent adopts scrap iron prepared from a metal electrode body, a metal electrode cold-state ignition mode is directly adopted for slagging and smelting, electric arcs are slowly added in batches during slagging and slag charge adding, the electric arcs are embedded into the slag charge all the time, and 2% to 4% of silicon dioxide is added into slag after the slag charge is completely melted. By adopting the smelting process controlling aluminum increase at the tail end of the electroslag ingot in the electroslag remelting process, electroslag is carried out, the problem that aluminum is increased at the tail end of the electroslag ingot can be effectively solved, and a basic guarantee is provided for improving the follow-up performance of the electroslag ingot.

Description

technical field [0001] The invention belongs to the technical field of electroslag metallurgy, and particularly relates to a smelting process for controlling the aluminum increase at the end of an electroslag ingot in the electroslag remelting process, which can solve the problem of increasing aluminum at the end of an electroslag ingot in the electroslag remelting process. Background technique [0002] As a secondary refining process, electroslag remelting is an essential and important process in the production of premium products. The steel ingot smelted by electroslag remelting has dense structure, uniform composition, and the purity is effectively improved, and the performance and life of the products made of it are greatly improved. [0003] The role of aluminum in steel mainly includes the following points: first, it exists as a deoxidizer in the smelting process and refines the grain; second, it is added to steel as an alloying element to improve the oxidation resista...

Claims

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Application Information

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IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 王文洋王晓飞黄开元翟文进张庆雷
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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