Aqueous alkali nickel-containing ductile iron valve material

A technology of nickel balls and valves, which is applied in the field of alloy alkali-resistant ductile iron valve materials, can solve the problems of short service life of valves, frequent replacement of valves, increase of use costs, etc., and achieve long working life, excellent alkali resistance, The effect of working life safety

Inactive Publication Date: 2008-10-08
周裕香
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, my country uses the traditional general-purpose smelting production process for alkali-resistant ductile iron valve materials. Due to the alloy formula and processing technology used in the valve, the service life of the valve is short, and the valve has the longest working life in the alkaline medium environment of about 35% for a long time. The length can only reach eight months, and there are many safety hazards and unstable performance
For production, valves need to be replaced frequently, which brings inconvenience to actual production and increases the cost of use

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] A liquid caustic nickel-containing ductile iron valve material, mainly including C, Si, Mn, Cu, Ni elements, the difference is that the content (weight) of each component element is: C 4-10%, Si 10%, Mn 5%, Cu1.0%, Ni 3-15%. Impurity content: Al<0.015%, Ti<0.016%, S<0.008%, P<0.002%.

[0013] It includes the following steps:

[0014] 1) Smelting: first add pig iron, scrap steel, and returned materials to the IT intermediate frequency furnace for heating, and then add ferroalloy, silicon, manganese, and nickel after melting. ℃; Except for pig iron, the rest of the furnace materials are derusted first and then put into the IT intermediate frequency furnace;

[0015] 2) Pouring: the temperature is 1380~1420℃;

[0016] 3) Modeling: shape shrinkage rate: 1.5-2.0%;

[0017] 4) Heat treatment: the temperature is 650-670°C, the holding time is 3-6 hours, and the furnace is cooled slowly to below 150°C and air-cooled to room temperature.

[0018] In the above step 2), the p...

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Abstract

The invention relates to valve material of liquid alkali nickeliferous nodular cast iron, and belongs to a manufacturing method of valve material of alloy alkali resistant nodular cast iron applied in the chemical industry. The manufacturing method comprises the following steps: charging cast iron, scrap steel and foundry returns into an IT intermediate frequency furnace to heat, adding ferroalloy, silicon, manganese, nickel and copper after melting, then performing casting and moulding after smelting and finally performing heat treatment. The valve material of the alkali resistant nodular cast iron can be produced steadily through the method. The material has the advantages of excellent alkali resistance, high comprehensive mechanical property and ideal metallurgical phase structure. The alkali resistance of the valve is improved considerably than the like products.

Description

technical field [0001] The invention relates to a method for manufacturing an alloy alkali-resistant ductile iron valve material used in the chemical industry. Background technique [0002] At present, my country uses the traditional general-purpose smelting production process for alkali-resistant ductile iron valve materials. Due to the alloy formula and processing technology used in the valve, the service life of the valve is short, and the valve has the longest working life in the alkaline medium environment of about 35% for a long time. The longest period can only reach eight months, and there are many safety hazards and unstable performance. For production, the valve needs to be replaced frequently, which brings inconvenience to actual production and increases the cost of use. [0003] The purpose of the invention is to provide a long service life and safe nickel-containing ductile iron valve material in liquid caustic soda for valves which have been in the alkaline med...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10F16K27/00
Inventor 周裕香
Owner 周裕香
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