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Low-chromium cast iron grinding ball and casting method thereof

A technology of low-chromium cast iron and casting method, applied in the field of chromium cast iron in the field of metal materials, can solve the problems of low service life and many internal defects, and achieve the effects of improving performance, reducing oxidation, and improving distribution uniformity.

Inactive Publication Date: 2014-05-07
王会智
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a low-chromium cast iron grinding ball and its casting method to solve the problem of low service life caused by many internal defects in the low-chromium cast iron grinding balls of the prior art. The grinding balls produced by the invention can greatly Reduce the number of internal defects, improve the crystal phase structure, thereby increasing the service life of the grinding ball

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A low chromium cast iron grinding ball, its composition contains 1.8% carbon, 0.5% silicon, 1.0% manganese, 0.8% chromium, 0.3% nickel, 0.3% molybdenum and essential impurity elements, It also contains 0.3% copper, 0.03% boron, 0.1% lithium, 0.1% sodium and 0.1% rare earth elements.

[0021] The casting method of the low chromium cast iron grinding ball comprises the following steps:

[0022] 1) Weigh raw materials such as cast iron, ferromanganese, ferrochrome, ferronickel, molybdenum powder, copper powder, boron powder, elemental silicon, elemental lithium, elemental sodium, and rare earth elements according to the above ratio, and set aside;

[0023] 2) Prepare the lost foam, and place the elemental sodium weighed in step 1) in the lost foam;

[0024] 3) Molten steel smelting: melt the cast iron, ferromanganese, ferrochromium and ferronickel weighed in step 1) into molten metal, then add molybdenum powder and copper powder to it and mix evenly, then decarburize and ...

Embodiment 2

[0028] A low chromium cast iron grinding ball, its composition contains 2.3% carbon, 1.0% silicon, 1.5% manganese, 3.0% chromium, 1.0% nickel, 1.0% molybdenum and essential impurity elements, It also contains 0.8% copper, 0.07% boron, 0.3% lithium, 0.2% sodium and 0.3% rare earth elements.

[0029] The casting method of the low chromium cast iron grinding ball comprises the following steps:

[0030] 1) Weigh raw materials such as cast iron, ferromanganese, ferrochrome, ferronickel, molybdenum powder, copper powder, boron powder, elemental silicon, elemental lithium, elemental sodium, and rare earth elements according to the above ratio, and set aside;

[0031] 2) Prepare the lost foam, and place the elemental sodium weighed in step 1) in the lost foam;

[0032] 3) Molten steel smelting: melt the cast iron, ferromanganese, ferrochromium and ferronickel weighed in step 1) into molten metal, then add molybdenum powder and copper powder to it and mix evenly, then decarburize and ...

Embodiment 3

[0036] A low chromium cast iron grinding ball, its composition contains 2.1% carbon, 0.8% silicon, 1.3% manganese, 1.9% chromium, 0.7% nickel, 0.7% molybdenum and essential impurity elements, It also contains 0.5% copper, 0.05% boron, 0.2% lithium, 0.15% sodium and 0.2% rare earth elements.

[0037] The casting method of the low chromium cast iron grinding ball comprises the following steps:

[0038] 1) Weigh raw materials such as cast iron, ferromanganese, ferrochrome, ferronickel, molybdenum powder, copper powder, boron powder, elemental silicon, elemental lithium, elemental sodium, and rare earth elements according to the above ratio, and set aside;

[0039] 2) Prepare the lost foam, and place the elemental sodium weighed in step 1) in the lost foam;

[0040] 3) Molten steel smelting: melt the cast iron, ferromanganese, ferrochromium and ferronickel weighed in step 1) into molten metal, then add molybdenum powder and copper powder to it and mix evenly, then decarburize and...

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Abstract

The invention relates to a low-chromium cast iron grinding ball and a casting method thereof. The low-chromium cast iron grinding ball contains carbon, silicon, manganese, chromium, nickel, molybdenum, copper, boron, lithium, sodium, rare-earth elements and essential impurity elements. The casting method comprises the following steps: preparing raw materials and an evaporative mold according to requirements, adding a simple substance sodium into the evaporative mold, and casting molten metal into the evaporative mold; and after the casting is cooled to 300-520 DEG C, taking out the casting, and carrying water quenching to finish the casting. The small-atom lithium and sodium are added, so that the sodium atoms and lithium atoms are diffused and filled in clearances of eutectic carbides or pores in the crystalline phase in the cast iron under high-temperature conditions, thereby greatly lowering the number of internal defects; and the boron powder and rare-earth elements can increase the quantity of the eutectic structures and enhance the dispersivity, so that the lithium atoms and sodium atoms can be filled and distributed in the whole structure, thereby enhancing the overall performance.

Description

technical field [0001] The invention relates to chromium cast iron in the field of metal materials, in particular to a low-chromium cast iron grinding ball and a casting method thereof. Background technique [0002] Regarding grinding balls, high-carbon and high-alloy cast grinding balls and high-carbon and low-alloy forged or cast grinding balls are widely used at home and abroad. Chromium cast iron grinding balls, while high-carbon and low-alloy grinding balls are mostly used in the wet process of mines. [0003] The casting of the existing chromium cast iron grinding balls is generally to add functional components such as manganese, chromium, silicon, nickel, molybdenum and copper into the cast iron, and then cast them into shape. The grinding balls cast with the above-mentioned ingredients and technological means are highly brittle and have a large number of internal defects. When they collide with each other, cracks are easily caused by internal defects, thereby af...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08B02C17/20
Inventor 王会智
Owner 王会智
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