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Use method of low-chromium alloy grinding ball modification agent

A technology of chromium alloy and modifier, which is applied in the field of casting grinding ball additives, can solve the problem of unsatisfactory mechanical performance indicators and wear resistance of low chromium alloy grinding balls, not too much use, and no obvious improvement in wear resistance. Improvement and other problems, to achieve the effect of fine structure and improvement of metamorphism, elimination of impurities, and stable and good use effect

Active Publication Date: 2013-04-17
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many modifiers for low-chromium alloy grinding balls, but they are not used too much, mainly because the modified materials used have no obvious improvement in wear resistance.
I have inspected many domestic manufacturers of grinding balls, such as dozens of manufacturers in Ningguo, Anhui, Shandong and Beijing. Our factory has also used the modifiers of two domestic manufacturers such as Zhenjiang, most of which use rare earth silicon and rare earth magnesium. Rare earth metamorphic materials such as low-chromium alloy grinding balls have unsatisfactory mechanical properties and wear resistance

Method used

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  • Use method of low-chromium alloy grinding ball modification agent
  • Use method of low-chromium alloy grinding ball modification agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Before smelting, the compound of group A and compound of group B are prepared according to 0.2% and 0.8% of the weight of molten iron respectively. In the later stage of smelting, when the chemical composition of molten iron reaches the following indicators: C: 2.2-2.8, Si: 0.5-1.2, Cr: 1.1-2.0 , Mn: 1.0-1.6, after P, S ≤ 0.05; three minutes before the molten iron is discharged, the temperature is 1480 ° C, first remove the impurities on the surface of the molten iron, and then remove the rare earth CeO in the compound of group A 2 25% and 75% of aluminum powder are mixed and put into the furnace. After 30 seconds, 60% of calcium oxide and 40% of calcium calcium barium in the compound of group B are mixed and put into the furnace, and the power supply is continued for 3 minutes to reach the molten iron. The temperature is 1470°C and transferred to the ladle for casting.

[0023] The chemical composition of the low chromium alloy grinding ball is:

[0024] Ingredient na...

Embodiment 2

[0029] Before smelting, the compounds of Group A and Group B are prepared according to 0.3% and 0.5% of the weight of molten iron respectively. In the later stage of smelting, when the chemical composition reaches the following indicators C: 2.2-2.8 Si: 0.5-1.2 Cr: 1.1-2.0 Mn: 1.0 After -1.6 P, S ?0.05; three minutes before the molten iron is discharged, the temperature is 1480 ° C, first remove impurities on the surface of the molten iron, and then remove the rare earth CeO in the compound of group A 2 40% and 60% of aluminum powder are mixed and put into the furnace. After 30 seconds, mix 40% of calcium oxide and 60% of silicon calcium barium in group B compound and put them into the furnace, and continue to power for 3 minutes to reach the temperature of tapping water 1470°C transfer to ladle for casting.

[0030] The chemical composition of the low chromium alloy grinding ball is:

[0031] Ingredient name C Si Mn Cr P S

[0032] Content % 2.60 1.1 1.1 2.1 0.045 0.035

...

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Abstract

The invention belongs to the technical field of cast grinding ball additive in ferrous metallurgy casting industry and relates to an application method of a low-chromium alloy grinding ball modification agent. The low-chromium alloy grinding ball modification agent is composed of a compound group A and a compound group B, by weight percentage, the compound group A is composed of 220% to 40% of CeO and 60% to 80% of aluminum powder, and the compound group B is composed of 60% to 40% of calcium oxide and 40% to 60% of silico-calcium-barium. The low-chromium alloy grinding ball modification agent has the advantages that after using the modification agent, hardness of manufactured low-chromium alloy grinding balls reaches HRc47-53, and toughness and abrasion-resisting performance of the grinding balls are improved remarkably. Under the premise that abrasion-resisting and anti-crushing performance of the grinding balls is further improved, ball loss is reduced from 1.12 kilograms / ton to 0.79 kilogram / ton after the modification agent is used for four months, and use effect is stable and good.

Description

[0001] The invention belongs to the technical field of casting grinding ball additives in the iron and steel metallurgical foundry industry, and in particular relates to a method for using a low-chromium alloy grinding ball modifier. Background technique [0002] In recent years, alloy balls of high, medium and low materials have their own advantages in the production of metallurgical wear-resistant balls at home and abroad. Among them, low-chromium alloy balls are used in 99% of domestic iron ore beneficiation production. It has the characteristics of low cost and high cost performance. The pursuit of high quality and high wear resistance in low-cost production materials is the project that has attracted the most attention from colleagues. [0003] At present, there are many modifiers for low chromium alloy grinding balls, but they are not used too much, mainly because the modified materials used have no significant improvement in wear resistance. I have inspected many domes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C33/04B22D1/00
Inventor 韩建国
Owner ANSTEEL GRP MINING CO LTD