Processing method of special valve material for chlorine gas

A processing method and valve technology, which is applied in the manufacture of alloy chloric acid-resistant ductile iron valve materials, can solve the problems of only eight months, short service life of valves, frequent replacement of valves, etc., and achieve excellent chloric acid resistance , long working life and high comprehensive mechanical properties

Inactive Publication Date: 2006-01-11
周裕香
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  • Summary
  • Abstract
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  • Claims
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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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Comparison scheme
Effect test

Embodiment Construction

[0012] A kind of processing method of special valve material for chlorine gas, the steps are as follows:

[0013] 1. Melting equipment and raw materials

[0014] Adopt IT intermediate frequency furnace, low S, low P pig iron, in addition, it is necessary to strictly control the impurity content in the charge: Al<0.03%, Ti<0.04%, and the rest of the charge is derusted;

[0015] 2. Melting process

[0016] Feeding sequence: first put pig iron, scrap steel, and recycled materials into the furnace for heating, and then add ferroalloy, silicon, and manganese after melting; the content of each main element is: C3~7%, Si8~26%, Mn5~10%.

[0017] Melting temperature: 1480-1520°C, melting time: 45-90 minutes.

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

[0019] 3. Pouring process

[0020] Pouring temperature: 1380 ~ 1420 ℃, depending on the size of the workpiece, the pouring speed is based on the principle of fast pouring, the weight of a single piece...

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Abstract

A precess for preparing the material dedicated for the valve of Cl gas includes such steps as smelting pig iron, used steel and returns in MF furnace, adding Fe alloy, Si and Mn, refining, casting and heat treating to obtain the chloric acid-resistant nodular cast iron.

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 present invention is to provide a long service life and safe special valve material for chlorine gas for valves that have been in the environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C22C38/06C21D6/00
Inventor 周裕香
Owner 周裕香
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