Method for producing large-sized zirconium ingot with the specification Phi of more than 600mm

A production method and large-scale technology, applied in the fields of metallurgy, casting, and petrochemical industry, can solve problems such as difficulty in ensuring the uniformity of components in large ingots, 100% guarantee of weld quality, and inability to completely eliminate crevice corrosion. The effect of producing large-scale zirconium materials, excellent surface quality of ingots, and stable solidification process

Inactive Publication Date: 2009-12-09
BAOJI TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, with the increase of ingot shape, the difficulty of smelting increases, and the composition uniformity of large ingots is often difficult to be guaranteed.
With the rapid development of domestic and foreign economies, the demand for large-scale zirconium corrosion-resistant equipment in the chemical industry and other industries has increased sharply, and the general production process of large-scale zirconium corrosion-resistant A large number of welding must be carried out, the production efficiency is low, the quality of the weld seam cannot be guaranteed 100%, the weld seam leakage accidents are prone to occur, and the crevice corrosion cannot be completely eliminated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 adds ZrO 2 Melting of zirconium ingots with alloy additives:

[0020] Step 1: Sponge zirconium (oxygen: 0.06%) and ZrO with a maximum particle size of no more than 30mm 2 Alloy additives, oxygen content target control 0.10%, fully mixed and pressed into electrode blocks:

[0021] Step 2: Use a vacuum plasma arc to weld the electrode block to the zirconium electrode, control the welding pre-vacuum to 2Pa, and the air leakage rate to 1.2Pa / min;

[0022] Step 3: Melt once into a Ф600mm ingot in a vacuum consumable electric arc furnace, the melting speed control parameters are: 22~16Kg / min, the arc stabilization control: the magnetic induction intensity is 30 gauss, and the arc stabilization current alternating time is controlled for 20 seconds; then Melting in a vacuum consumable electric arc furnace again to form a Ф700mm ingot, the melting speed control parameters are: 35~25Kg / min, the arc stabilization control: the magnetic induction intensity is 20 gauss...

Embodiment 2

[0025] Embodiment 2 adds the smelting of the zirconium ingot of Zr-2.5Nb alloy additive:

[0026] Step 1: Sponge zirconium (oxygen: 0.06%) and zirconium-niobium master alloy additives with a maximum particle size of no more than 30mm, the target oxygen content is controlled at 0.10%, fully mixed and pressed into an electrode block: the chemical composition of the zirconium-niobium master alloy : Niobium: 35%, Oxygen: 0.06%;

[0027] Step 2: Use a vacuum plasma arc to weld the electrode block to the zirconium electrode, control the welding pre-vacuum to 1.2Pa, and the air leakage rate to 1Pa / min;

[0028] Step 3: Melting on a vacuum consumable electric arc furnace once into a Ф540mm ingot, the melting speed control parameters are: 15~10Kg / min, the arc stabilization control: the magnetic induction intensity is 20 gauss, and the arc stabilization current alternating time is controlled for 20 seconds; After the second vacuum consumable electric arc furnace melting, a Ф600mm ingot...

Embodiment 3

[0031] The smelting of the zirconium ingot that does not add alloy additive in embodiment 3:

[0032] Step 1: Compress zirconium sponge (oxygen: 0.08%) with a maximum particle size of no more than 30mm into an electrode block:

[0033] Step 2: Use the vacuum plasma arc to weld the electrode block to the zirconium electrode, control the welding pre-vacuum to 1.2Pa, and the air leakage rate to 1.3Pa / min;

[0034] Step 3: Melt once into a Ф600mm ingot in a vacuum consumable electric arc furnace, the melting speed control parameters are: 22~16Kg / min, the arc stabilization control: the magnetic induction intensity is 30 gauss, and the arc stabilization current alternating time is controlled for 20 seconds; then Melting in a vacuum consumable electric arc furnace again to form a Ф700mm ingot, the melting speed control parameters are: 35~25Kg / min, the arc stabilization control: the magnetic induction intensity is 20 gauss, the arc stabilization current alternating time is controlled ...

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PUM

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Abstract

The invention relates to a method for producing large-sized zirconium ingot with the specification Phi of more than 600mm, and the technical characteristics lie in that a consumable electrode with relatively uniform components is prepared by adopting dosing, mixing and vacuum plasma arc electrode assembly and welding technology, and vacuum consumable electric arc melting is carried out for at least twice by adopting technology of 'speed reducing melting' and 'component uniformity controlling' and the like under the conditions that the melting speed control parameter is 10-40kg/min and the arc stability control is carried out with the magnetic induction of 10-50 Gauss and the stable arc current alternate control time of 1-60 seconds. Compared with the prior art, the invention has the advantages that the large-sized zirconium ingot produced by the invention has uniform and stable chemical components and excellent ingot surface quality, is better than small ingot melted by vacuum consumable electric arc, and has the advantages of high yield, high production efficiency and being easy for producing large zirconium material and the like; and the invention is applicable to producing ingots for large zirconium material.

Description

technical field [0001] The invention relates to a production method of large-sized zirconium ingots of Ф600 mm or more, which belongs to the field of casting technology and is mainly used in metallurgy, petrochemical and other fields, and stably realizes the industrialized batch production of large-sized zirconium ingots of Ф600 mm or larger. Background technique [0002] Zirconium is a transition group element, which belongs to the IV-B group elements in the periodic table of elements. It is not only a rare metal, but also a strategic metal. It has high temperature strength, good corrosion resistance, machinability, good performance and With comprehensive properties such as low thermal neutron absorption cross-section, it is widely used in nuclear energy, aerospace, aviation, ships, electronics, textiles, papermaking, medicine and other industries, and has broad prospects. In recent years, due to its excellent corrosion resistance, its application in the chemical industry h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C16/00C22C1/02
Inventor 陈峰贾栓孝李献军张健冯军宁杨蓉何育兴陈战乾李宏建国斌
Owner BAOJI TITANIUM IND CO LTD
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