Method for producing malleable iron pipe by using reclaiming waste

A technology for recycling scrap and cast iron pipe fittings, which is applied in the field of metal casting and can solve the problems of graphite, casting gray parts, and unstable casting performance.

Active Publication Date: 2017-05-31
HEBEI JIANZHI CASTING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the casting metal melting and pouring process for the production of malleable cast iron pipe fittings, the ratio of raw materials and the melting process are the main factors affecting product performance. The existing batching method with casting pig iron and scrap steel as the main raw material has problems with unstable performance of castings, It is easy to have the problem of casting g

Method used

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Embodiment Construction

[0018] Below in conjunction with embodiment the present invention is described in further detail:

[0019] The method of the present invention for producing malleable cast iron pipe fittings by using recycled waste materials matches the smelting process of the intermediate frequency electric furnace, and replaces cast iron in raw materials with waste mechanical iron. Although there are many types of waste mechanical iron, there are certain rules in the content of chemical elements. Especially after a variety of waste machine irons are crushed and fully mixed, the carbon content is generally about 3.4%, the silicon content is about 1.9%, and the manganese content is about 0.6%. In order to meet the performance requirements of casting products, the weight of raw materials The ratio is: returned furnace material, 45-55 parts; scrap steel, 10-30 parts; mechanical iron, 20-35 parts; carburizer, 0.6-1 part; ferrosilicon, 0.25-0.5 parts; 10 servings.

[0020] As the first preferred ...

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Abstract

The invention relates to a method for producing a malleable iron pipe by using reclaiming waste. The method is characterized in that a medium frequency furnace smelting process is adopted, foundry pig iron with waste machine iron, and raw materials include, by weight, 45-55 parts of foundry returns, 10-30 parts of waste rolled steel, 20-35 parts of the machine iron, 0.6-1 part of a carburetant, 0.25-0.5 part of ferrosilicon and 0-10 parts of malleable cast iron chippings. According to the method, the raw material structure and the matching process are optimized, the matrix structure of a cast workblank piece is improved, the product performance is stabilized, the phenomenon of casting grey pieces is reduced, and the rejection rate of cast products is reduced.

Description

technical field [0001] The invention relates to a batching method, in particular to a method for producing malleable cast iron pipe fittings by using recycled waste materials, and belongs to the technical field of metal casting. Background technique [0002] In foundry production enterprises, the technological process for the production of malleable iron pipe fittings mainly includes mold preparation, casting metal melting and pouring, casting processing and inspection procedures. At present, in the melting and pouring process of cast metal, cast pig iron and scrap steel are mostly used as the main raw materials, and auxiliary materials are added according to a certain proportion, and cupola or electric furnace is used for smelting. After chemical annealing treatment, a high-strength cast iron is obtained, which has high strength, plasticity and impact toughness. [0003] In the casting metal melting and pouring process for the production of malleable cast iron pipe fitting...

Claims

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Application Information

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IPC IPC(8): C22C33/08C21C1/08
CPCC21C1/08C22C33/08Y02P10/20
Inventor 任福艳刘唐刘金生陈秀军陈凤宇艾晨光
Owner HEBEI JIANZHI CASTING GROUP
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