Material of special valve for chlorine

A valve and chlorine technology, applied in valve details, valve device, valve shell structure, etc., can solve the problems of only eight months long, short valve service life, increased use cost, etc., and achieve excellent chloric acid resistance. , Long working life and improved chloric acid resistance

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

AI Technical Summary

Problems solved by technology

[0002] At present, the special valve material for chlorine gas in my country adopts the traditional general-purpose smelting production process. Due to the alloy formula and processing technology used in it, the service life of the valve is short, and the valve has been in the environment of chloric acid medium for a long time, and the longest working life 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 special valve material for chlorine gas, mainly including C, Si, Mn, Cu elements, characterized in that: the content (weight) of the above-mentioned elements of each component is: C 5-12%, Si 15%, Mn 3%, Cu 0.8% . Impurity content: Al<0.015%, Ti<0.016%, S<0.008%, P<0.002%.

[0013] Its production process steps are as follows:

[0014] 1. Melting equipment and raw materials

[0015] Adopt IT intermediate frequency furnace, low S, low P pig iron, and also need to strictly control the impurity content in the charge: Al<0.015%, Ti<0.016%, S<0.008%, P<0.002%.

[0016] 2. Melting process

[0017] Feeding sequence: first put pig iron, scrap steel, and returned materials into the furnace for heating, and then add ferroalloy, silicon, and manganese after melting; the content of each main element is: C 5-12%, Si 15%, Mn 3%, Cu 0.8 %. Melting temperature: 1480-1520°C, melting time: 45-90 minutes.

[0018] Spheroidization and inoculation treatment temperature: 1450~1480℃. ...

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Abstract

The invention relates to a valve material specially used for chlorine. 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 and copper after melting, then performing casting and moulding after being smelted and finally performing heat treatment. A valve material of chloric acid resistant nodular cast iron can be steadily produced through the method. The material has the advantages of excellent chloric acid resistance, high comprehensive mechanical property and ideal metallurgical phase structure. The chloric acid resistance of the valve is improved considerably than the like products.

Description

technical field [0001] The invention relates to a manufacturing method of an alloy chloric acid-resistant ductile iron valve material used in the chemical industry. Background technique [0002] At present, the special valve material for chlorine gas in my country adopts the traditional general-purpose smelting production process. Due to the alloy formula and processing technology used in it, the service life of the valve is short, and the valve has been in the environment of chloric acid medium for a long time, and the longest working life can only reach eight months. Moreover, there are many potential 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. Contents of the invention [0003] The purpose of the invention is to provide a long service life and safe special valve material for chlorine gas for the valves which are in the environment of chl...

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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