• chromite sand double skin defect in heavy castings

Application of Response Surface Methodology for Modeling

melting point around 2090 degree centigrade. The chromite sand can be used to cast metals of high density and melting point, where the use of silica sand may result in defects like sand fusion. The Chromite sand replace Zircon sand, since the cost is low. Resin – Phenol Farmaldehyde . In the present work phenol formaldehyde is used as the binder.

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An investigation into the prediction of double

that the foundry experienced the double-skin defect, a niche quality issue that most commonly occurs in heavy-section steel casting with chromite molding materials. After it was determined that the double-skin defect was occurring, a methodology based on prior research was developed to understand the causation. Casting emissions

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An investigation into the prediction of double

After an extensive literature review, it was concluded that the foundry experienced the double-skin defect, a niche quality issue that most commonly occurs in heavy-section steel casting with chromite molding materials After it was determined that the double-skin defect was occurring, a methodology based on prior research was developed to

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Hevi sand process technical paper

Jan 21, 2013All of which are detrimental to foundries and ultimatelt casting quality. 2. Changes in Turbidity as above, but also increased incidence of double skin defects, ( see paper "Chromite Double Skin Defect on Heavy-Section Steel Castings" by same author). 3.

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3D

Chromite Double Skin Defect on Heavy-Section Steel Castings J D Howden This paper collates the relevant work done on chromite sand and its usage in steel foundries over the last 25 years.

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Heat Transfer Chromite Sand

Chromite Double Skin Defect on Heavy Steel Casting. Chromite Double Skin Defect on Heavy Casting Applications Figure 4 shows the heat transfer characteristics of various The

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The Glossary of Foundry and Casting

Chromite FeCr2O4. Specialty sand used in molding, has a similar effect to chills. Double Skin (Bottom Splash, Ingot Shell, Plaster) A casting defect caused by sand dropping from the cope or other overhanging section. Drop Ball A heavy weight, usually ball or pear shaped, dropped from a height to break large pieces of metal scrap.

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Foundry sand testing focus of molding division.

Jun 01, 1990Jun 01, 1990The formation and causes of chromite double skin defect were reviewed by J. Howden, Volclay, Ltd (90-28), and solutions, such as raw material quality controls and technical controls relating to melting procedures, pouring speeds, etc, were offered.

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Chromite Double Skin Defect on Heavy

Chromite Double Skin Defect on Heavy-Section Steel Castings J. D. Howden EILDON Refractories ABSTRACT This paper co llates the relevant work done on chromite sand and its usage in steel foundries over the last 25 years. Many of these works have discussed the chromite double skin defect (or chromite glazing), but none have suggested

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AMCOL

THE DOUBLE SKIN DEFECT Typical Occurrences In the author's experience, double skin is only found on steel castings that have been produced in chromite moulds or with chromite cores. It is also known as glazing, frit, or elephant skin, dependent upon where you are or with whom you are talking.

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Turbidity Testing Discussion

• see paper Chromite Double Skin Defect on Heavy-Section Steel Castings " by J.D. Howden for more information on these types of defects. • So lower turbidity values are generally thought to be advantageous in the casting process • The typical test method for most turbidity tests involves agitating chromite sand in water

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Evaluation of South African Chromite sand sintering

penetration or sand burn on. 8. Double skin is another surface defects affecting the casting of heavy section steel in chromite sand mould. The defects depend on a phenomenon called metallization. The metallization of chromite sand consists of the reduction of iron from the chromite sand. Under reducing conditions, Iron droplets are reduced

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Overseas Students in the United Kingdom: Some Recent

Chromite Double Skin Defect on Heavy-Section Steel Castings J D Howden This paper collates the relevant work done on chromite sand and its usage in steel foundries over the last 25 years.

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