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Low nickel cast iron and preparation method thereof and use thereof in impeller

A technology of nickel cast iron and its manufacturing method, which is applied in the direction of casting equipment, the control of pouring molten metal from the ladle, mechanical equipment, etc., which can solve the problems of nickel resource shortage and achieve high impact toughness

Active Publication Date: 2009-04-29
ZHEJIANG ZHENXING PETROCHEM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem of lack of nickel resources in the prior art, the present invention provides a low-nickel cast iron that replaces the role of nickel in cast iron by adding other alloy elements, thereby reducing the nickel content

Method used

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  • Low nickel cast iron and preparation method thereof and use thereof in impeller
  • Low nickel cast iron and preparation method thereof and use thereof in impeller
  • Low nickel cast iron and preparation method thereof and use thereof in impeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 150kg of raw iron, 81kg of scrap steel, 30kg of blast furnace ferromanganese, 6kg of ferromanganese nitride, 16kg of electrolytic nickel, 8kg of electrolytic copper, and 9kg of 75 ferrosilicon. Mix and prepare the charge, put the charge into an intermediate frequency electric furnace and energize and melt it. After the charge is completely melted, cover it with perlite on the (liquid iron) to raise the temperature. After adding ferrosilicon and melting ferrosilicon, the iron can be tapped. The temperature at which molten iron is poured into the sand mold or shell mold (the part in red is not clearly described) is controlled at 1400°C. The properties of the low-nickel cast iron obtained are compared with those of No. 1 nickel cast iron in the United States, as shown in Table 1.

[0023] Table 1

[0024]

Embodiment 2

[0026] Weigh 238kg of raw iron, 16kg of ferromanganese nitride, 30kg of electrolytic nickel, 14kg of electrolytic copper, and 2kg of 75 ferrosilicon, and mix them to make a charge. Put the charge into an intermediate frequency electric furnace and melt it with electricity. After the charge is completely melted, cover it with perlite Raise the temperature on the (liquid iron), when the temperature of the (liquid iron) rises to 1700°C, add ferrosilicon after slag removal, and iron can be tapped after the ferrosilicon is melted. The temperature at which molten iron is poured into the sand mold or shell mold (the part in red is not clearly described) is controlled at 1500°C. The obtained low-nickel cast iron is compared with the properties of No. 1 nickel cast iron in the United States, as shown in Table 2.

[0027] Table 2

[0028]

Embodiment 3

[0030] Weigh 233kg of primary iron, 15kg of blast furnace ferromanganese, 15kg of ferromanganese nitride, 22kg of electrolytic nickel, 8kg of electrolytic copper, and 7kg of 75% ferrosilicon, and mix them to make a charge. Finally, cover the molten iron with perlite to raise the temperature. When the temperature of the molten iron rises to 1750°C, add ferrosilicon after slag removal and melt the ferrosilicon to tap the iron, and pour the molten iron into the sand mold or shell mold The temperature (not clearly described in the red part) is controlled at 1550°C. The properties of the low-nickel cast iron obtained are compared with those of No. 1 nickel cast iron in the United States, as shown in Table 3. (please supplement table 3, list low-nickel cast iron of the present invention and No. 1 nickel cast iron of the United States in the values ​​of parameters such as strength, hardness, impact toughness, corrosion resistance, metallographic structure)

[0031] table 3

[0032]...

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PUM

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Abstract

The invention discloses a low-nickel cast iron material, which comprises the following compositions in weight percentage: 2.0 to 3.6 percent of C, 1.0 to 2.8 percent of Si, 3 to 10 percent of Mn, 3 to 10 percent of Ni, 2 to 5 percent of Cu, 0.05 to 0.5 percent of N, and the balance being iron. The invention discloses a manufacturing method for low-nickel cast iron at the same time, which comprises the following steps: a, preparing a charging material; b, charging the charging material into an intermediate frequency electric furnace to melt, covering the charging material by perlite after the charging material is totally melted; and c, when the charging material is heated to above 1,650 DEG C, removing slag and discharging molten iron; and controlling the cast molten iron at a temperature of between 1,400 and 1,550 DEG C. The invention also discloses application of the low-nickel cast iron to a guide impeller. Combination property and abrasion resistance of the low-nickel cast iron are higher than those of American No. I nickel cast iron, and metallurgical structure and corrosion resistance of the low-nickel cast iron accord with those of the American No. I nickel cast iron.

Description

technical field [0001] The invention relates to an alloy cast iron material and a preparation method of the cast iron material. In particular, it relates to a low-nickel cast iron material and a preparation method thereof. The invention also relates to the application of the low-nickel cast iron material in the vane guide wheel. Background technique [0002] High-nickel cast iron contains Ni13.5% to 36%, and the matrix is ​​austenite, so it is also called nickel austenitic cast iron. According to its graphite form, it is divided into gray cast iron and nodular cast iron. There are 8 grades of austenitic gray cast iron according to the US ASTMA436-97 standard. There are 9 grades of austenitic ductile iron according to the US ASTM A439-99 standard. [0003] High-nickel cast iron is widely used in petroleum, chemical machinery, nuclear industry, aerospace industry, marine industry and other fields. [0004] At present, only three or four grades are selected for the impelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08B22D37/00F04D29/24
Inventor 宋其通
Owner ZHEJIANG ZHENXING PETROCHEM MACHINERY
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