Method for producing nodular cast iron in high aluminum through melting in three-stage furnace

A technology of ductile cast iron and production method, which is applied in the field of metallurgy, can solve the problems of undisclosed production process, restricting the service life of the side sealing plate coal retainer of boiler accessories, etc., and achieve the effects of quick results, low investment and high economic benefits

Inactive Publication Date: 2005-03-30
王长亭
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Problems solved by technology

But the problem is that the production process of this high-alumina heat-resistant ductile iron has not been made public. How to use local resources to produce high-alumina heat-resistant ductile iron is a key issue that restricts the life of boiler accessories side sealing plates and coal retainers.

Method used

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Embodiment Construction

[0021] Production Technology of High Alumina Heat-resistant Ductile Iron

[0022] 1. Smelting process of ductile iron

[0023] In the foundry workshop, a 1 ton / hour three-section punching iron furnace is used. The diameter of the furnace is 600 mm, the furnace height is 4.5 meters, the hot air temperature is 140 ° C, the molten iron temperature is 1350 ° C, and the sulfur content of Shanxi coke is 1.3%.

[0024] Jinan P08 pig iron: C4.4%, Si0.51%, Mn0.5%, S0.047%, P0.084%.

[0025] Ratio of ingredients: P08 pig iron 50%, nodular iron return charge 40%, scrap iron 10%.

[0026] Nodulizer (produced by alloy casting), its chemical composition should meet: Mg7-8%, Re11.5%, Si40%, Al1.34%.

[0027] Spheroidization process: the spheroidization process adopts the bottom-covering pit flushing method, the addition of nodulizer is 2%, the ferrosilicon (75 ferrosilicon) is inoculated with 0.5%, and the desulfurization (S) is added with 0.5% alkali. Put the spheroidizing agent on the b...

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Abstract

This invention relates to a method for producing high aluminium-contd. spheroidal cast iron. The prodn. process is: (1). The process used for melting molten spheroidal iron is used for producing qualified molten spheroidal cast iron. (2). molten aluminium is proceeded degassing treatment by using tri-oxygen degassing agent, mixing said molten aluminium 25% and molten spheriodal iron 75%, keeping temp. of 1100 deg.C for 40 hrs, without oxidation being occurred. This invention three-section furnace for melting high-aluminium conte, theat-resisting spheroidal cast iron has advantages of: quick becoming effective, high economic benefit and the inventive product high-temp.-resisting spheroidal cast iron can be used for boiler, burner the like high temp. environment.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a production method for smelting high-alumina nodular cast iron with a three-section furnace. technical background [0002] The side sealing plate and coal retainer of the boiler accessories are relatively large, and the raw material is high-silicon heat-resistant cast iron. Many users report that the heat-resistant temperature is low and the service life is short. Basically, it needs to be replaced every three months, which not only increases maintenance costs, but also affects work efficiency. In order to solve this problem, after consulting the metal material manual, the Soviet standard RQTAL-24, high-alumina heat-resistant ductile iron is a good material for the production of side sealing plates and coal retainers. It has the advantages of high temperature resistance, oxidation resistance, and long service life. But the problem is that the production process of this high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/08C22C37/04
Inventor 王长亭
Owner 王长亭
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