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Method for preparing industrial pure zirconium ingot

An industrially pure, ingot-casting technology, applied in the fields of foundry, nuclear power, metallurgy, and petrochemical industry, it can solve the problems of fracture, inclusion of metallurgical defects, leakage, etc., and achieve the effect of uniform chemical composition and low content of impurity elements.

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

If the production process of zirconium sponge and zirconium ingot is not well controlled, it is easy to produce ZrO 2 , ZrN or ZrC defects, and if the vacuum consumable melting process cannot be completely eliminated, inclusion metallurgical defects will occur. Ingots containing inclusion metallurgical defects are prone to cracking and micro-cracks in subsequent processing. Such small cracks cannot pass non-destructive testing and other technologies. It was thoroughly discovered that accidents such as component fatigue failure, fracture, and leakage will occur at the micro-cracks during use, resulting in great economic losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Mix commercially pure zirconium sponge (oxygen: 0.10%; iron: 0.15%; chromium: 0.15%) and press it into an electrode block:

[0020] Step 2: Weld the electrode blocks into electrodes by welding methods such as plasma arc;

[0021] Step 3: Vacuum consumable arc melting and smelting into Ф80mm ingot once, the current is controlled at 10-20KA, the voltage is controlled at 31-36V, the melting vacuum is 3.5Pa, and the air leakage rate is 0.15Pa·m 3 / sec;

[0022] Step 4: Electron beam smelting to form a Ф125mm ingot twice, the pressurized current is controlled at 0.5-10A, the smelting speed is controlled at 15-30kg / h, and the smelting vacuum is 1×10 -2 Pa, the air leakage rate is 0.05Pa·m 3 / sec.

[0023] The surface of the ingot obtained by smelting is smooth and clean, without subcutaneous pores, cold shuts, etc. Samples were taken at the head and bottom of the ingot for chemical composition analysis. The analysis results show that the chemical composition is uni...

Embodiment 2

[0025] Step 1: Mix commercially pure zirconium sponge (oxygen: 0.08%; iron: 0.12%; chromium: 0.2%) and press it into an electrode block:

[0026] Step 2: Weld the electrode blocks into electrodes by welding methods such as plasma arc;

[0027] Step 3: Vacuum consumable arc melting and smelting into Ф100mm ingots once, the current is controlled at 3KA, the voltage is controlled at 28-42V, the melting vacuum is 2.5Pa, and the air leakage rate is 0.11Pa m 3 / sec;

[0028] Step 4: Electron beam smelting to form a Ф130mm ingot twice, the pressurized current is controlled at 0.5-10A, the smelting speed is controlled at 16-31kg / h, and the smelting vacuum is 5×10 -2 Pa, the air leakage rate is 0.03Pa·m 3 / sec.

[0029] The surface of the ingot obtained by smelting is smooth and clean, without subcutaneous pores, cold shuts, etc. Samples were taken at the head and bottom of the ingot for chemical composition analysis. The analysis results show that the chemical composition is unifor...

Embodiment 3

[0031] Step 1: Mix commercially pure zirconium sponge (oxygen: 0.1%; iron: 0.16%; chromium: 0.18%) and press it into an electrode block:

[0032] Step 2: Weld the electrode blocks into electrodes by welding methods such as plasma arc;

[0033] Step 3: Melting into Ф100mm ingot once by electron beam melting, the current is controlled at 0.5-10A, the melting speed is controlled at 10-14kg / h, and the melting vacuum is 2.5×10 -2 Pa, the air leakage rate is 0.09Pa m 3 / sec;

[0034] Step 4: Electron beam smelting to form a Ф130mm ingot twice, the pressurized current is controlled at 0.5-10A, the smelting speed is controlled at 16-31kg / h, and the smelting vacuum is 5×10 -2 Pa, the air leakage rate is 0.03Pa·m 3 / sec.

[0035]The surface of the ingot obtained by smelting is smooth and clean, without subcutaneous pores, cold shuts, etc. Samples were taken at the head and bottom of the ingot for chemical composition analysis. The analysis results show that the chemical composition ...

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PUM

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Abstract

The invention relates to a method for preparing industrial pure zirconium ingot, used in the field of nuclear power, metallurgy, petrochemical engineering and the like. The method includes the steps that industrial sponge zirconium of required weight is weighed to prepare an electrode block by pressing; the pressed electrode block is welded into an electrode; and then electric beam melting on vacuum consumable electro-arc furnace combining electric beam melting is carried out for at least once, so as to obtain industrial pure zirconium ingot. The zirconium ingot produced by the invention has uniform and stable chemical components and low content of impurity elements of Fe, Cr, O, H and the like, is better than the ingot melted by vacuum consumable electric arc, and is not mixed with high or low density of ZrO2 and WC; and the invention is applicable to producing pure zirconium ingot with high metallurgy quality.

Description

technical field [0001] The invention relates to a method for preparing an industrially pure zirconium ingot, which belongs to the field of casting technology and is mainly used in the fields of metallurgy, petrochemical industry, nuclear power and the like. Background technique [0002] Zirconium is a transition group element, belonging to IV-B group elements in the periodic table, it is not only a rare metal, but also a strategic metal. It has comprehensive properties such as high temperature strength, good corrosion resistance, machinability, good performance and low thermal neutron absorption cross section. Zirconium also has excellent compatibility with nuclear fuel and has a very small thermal neutron capture cross section (0.18× 10-28m 2 ), and its radiation resistance is also very good, plus zirconium has good gas absorption at high temperature, good corrosion resistance and processing performance, etc., zirconium materials are widely used as cladding materials and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/20C22B34/14
Inventor 李献军陈峰雷让岐张健文志刚陈战乾何育兴冯军宁杨蓉王永强
Owner BAOJI TITANIUM IND CO LTD
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