CN110760745A

CN110760745A - Low-chromium alloy grinding ball

Info

Publication number: CN110760745A
Application number: CN201810832279.8A
Authority: CN
Inventors: 朱文星; 朱万军
Original assignee: Anhui Ningguo Ningxing Abrasion Resistant Material Co Ltd
Current assignee: Anhui Ningguo Ningxing Abrasion Resistant Material Co Ltd
Priority date: 2018-07-26
Filing date: 2018-07-26
Publication date: 2020-02-07

Abstract

The invention belongs to the field of casting manufacturing, and particularly relates to a low-chromium alloy grinding ball which comprises the following components: 2.0 to 3.3 percent of C, 1.75 to 2.2 percent of Si, 1.3 to 2.6 percent of Mn, 1.5 to 2.5 percent of Cr, 0.25 to 0.50 percent of Cu, 0.05 to 0.12 percent of Ti, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the balance of Fe. The content of noble metal Mo is reduced and the cost is reduced through the reasonable proportion of the high-chromium alloy. The high-chromium cast-alloy material obtained by the method has high hardness, the HRC can reach 60, the impact toughness is high, and the impact value reaches 12J/cm 2. The falling ball impact fatigue life is more than or equal to 9500 times, the breakage rate is less than 0.9 percent, and the cost is reduced.

Description

Low-chromium alloy grinding ball

Technical Field

The invention belongs to the field of casting manufacturing, and particularly relates to a low-chromium alloy grinding ball.

Background

In the production industries of cement, silicate products, novel building materials, refractory materials, fertilizers, black and non-ferrous metal ore dressing, glass ceramics and the like, a ball mill is a main production device for crushing and grinding related materials such as ores, coal, cement and the like, and a grinding ball is one of main wearing parts of the ball mill. Compared with grinding balls made of other materials, the high-chromium cast iron grinding ball is widely applied due to high hardness, low abrasion, good toughness, less breakage, good comprehensive mechanical properties and the like.

As a wear-resistant material grinding ball for wear resistance, a high-chromium grinding ball and a steel forged grinding ball are generally used. Although the high-chromium ball has good wear resistance, the production cost is high, and a large amount of national rare metal chromium is consumed; the steel forging grinding ball has poor wear resistance, not only consumes a large amount of steel, but also needs large labor intensity in the processing technology.

Disclosure of Invention

The invention aims to provide a low-chromium alloy grinding ball.

In order to achieve the purpose, the invention adopts the following technical scheme:

a low chromium alloy grinding ball comprises the following components: 2.0 to 3.3 percent of C, 1.75 to 2.2 percent of Si, 1.3 to 2.6 percent of Mn, 1.5 to 2.5 percent of Cr, 0.25 to 0.50 percent of Cu, 0.05 to 0.12 percent of Ti, 0.5 to 1 percent of graphene, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the balance of Fe.

Comprises the following components: 2.8 percent of C, 2.0 percent of Si, 1.8 percent of Mn, 2 percent of Cr, 0.3 percent of Cu, 0.08 percent of Ti, 0.8 percent of graphene, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the balance of Fe.

The preparation method of the low-chromium alloy grinding ball comprises the following steps:

1) smelting raw materials: putting the raw materials into a frequency electric furnace for smelting, and discharging molten iron obtained by smelting; the smelting temperature is 1640-; the tapping temperature of the molten iron is 1500-1550 ℃; 4) pouring the molten iron to obtain a prefabricated part; the casting temperature is 1410-1440 ℃; 5) the prefabricated part is put into a furnace for heating, and the temperature is increased by 100-150 ℃ per hour; when the temperature in the furnace reaches 800-850 ℃, preserving the heat for 2 hours; 6) naturally cooling along with the furnace, and tempering temperature: 240 ℃ and 260 ℃, duration: 1.4-1.8 hours.

Compared with the prior art, the invention has the beneficial effects that:

the application reduces the content of noble metal Mo and the cost by reasonable proportioning of the high-chromium alloy; the graphene is added, so that the graphene can be diffused along with alloy water, the transformation of carbide and the coarsening of carburization problems can be inhibited during low-temperature tempering, the yield strength is improved, the alloy obtains better toughness, and meanwhile, the strength and the corrosion resistance of the alloy can be improved by adding the graphene; by adding Si element, the tensile strength and impact toughness of the alloy are enhanced, the amount of martensite can be increased by increasing the content of Mn, and the wear resistance of the casting is improved; the addition of Cu can separate out fine particles in the cooling process, and the strength of the casting is improved. Ti can combine with carbon and nitrogen to form high-melting point compound, which can be used as external crystal nucleus to refine crystal grains and improve strength and toughness. Meanwhile, the elements are dissolved in the matrix in a solid manner, so that the transformation from austenite to pearlite can be delayed, and the hardenability of the material can be improved; in the present application, by reducing the tempering temperature, the transformation of carbides is suppressed, the precipitation of carbides is reduced, and the stability of the retained austenite is improved. The high-chromium cast-alloy material obtained by the method has high hardness, the HRC can reach 60, the impact toughness is high, and the impact value reaches 12J/cm 2. The falling ball impact fatigue life is more than or equal to 9500 times, the breakage rate is less than 0.9 percent, and the cost is reduced.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following preferred embodiments.

Example 1:

a low chromium alloy grinding ball comprises the following components: 2.8 percent of C, 2.0 percent of Si, 1.8 percent of Mn, 2 percent of Cr, 0.3 percent of Cu0.08 percent of Ti, 0.8 percent of graphene, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the balance of Fe.

1) smelting raw materials: putting the raw materials into a frequency electric furnace for smelting, and discharging molten iron obtained by smelting; the smelting temperature is 1640-; the tapping temperature of the molten iron is 1500-1550 ℃; 4) pouring the molten iron to obtain a prefabricated part; the casting temperature is 1410-1440 ℃; 5) the prefabricated part is put into a furnace for heating, and the temperature is increased by 100-150 ℃ per hour; when the temperature in the furnace reaches 800-850 ℃, preserving the heat for 2 hours; 6) naturally cooling along with the furnace, and tempering temperature: 240 ℃ and 260 ℃, duration: 1.4-1.8 hours. The HRC of the alloy grinding ball obtained in the embodiment can reach 60, and meanwhile, the alloy grinding ball has strong impact toughness and an impact value of 12J/cm 2. The falling ball impact fatigue life is more than or equal to 9500 times, and the breakage rate is less than 0.9 percent.

Example 2: a low chromium alloy grinding ball comprises the following components: 2.0% of C, 1.75% of Si, 1.3% of Mn, 1.5% of Cr1.5%, 0.25% of Cu, 0.05% of Ti, 0.5% of graphene, less than or equal to 0.02% of S, less than or equal to 0.02% of P, and the balance of Fe.

1) smelting raw materials: putting the raw materials into a frequency electric furnace for smelting, and discharging molten iron obtained by smelting; the smelting temperature is 1640-; the tapping temperature of the molten iron is 1500-1550 ℃; 4) pouring the molten iron to obtain a prefabricated part; the casting temperature is 1410-1440 ℃; 5) the prefabricated part is put into a furnace for heating, and the temperature is increased by 100-150 ℃ per hour; when the temperature in the furnace reaches 800-850 ℃, preserving the heat for 2 hours; 6) naturally cooling along with the furnace, and tempering temperature: 240 ℃ and 260 ℃, duration: 1.4-1.8 hours. The HRC of the alloy grinding ball obtained in the embodiment can reach 48, and meanwhile, the alloy grinding ball has strong impact toughness and an impact value of 12J/cm 2. The falling ball impact fatigue life is more than or equal to 9300 times, and the breakage rate is less than 0.9 percent.

Example 3: a low chromium alloy grinding ball comprises the following components: 3.3 percent of C, 2.2 percent of Si, 2.6 percent of Mn, 2.5 percent of Cr2, 0.50 percent of Cu, 0.12 percent of Ti, 1 percent of graphene, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the balance of Fe.

1) smelting raw materials: putting the raw materials into a frequency electric furnace for smelting, and discharging molten iron obtained by smelting; the smelting temperature is 1640-; the tapping temperature of the molten iron is 1500-1550 ℃; 4) pouring the molten iron to obtain a prefabricated part; the casting temperature is 1410-1440 ℃; 5) the prefabricated part is put into a furnace for heating, and the temperature is increased by 100-150 ℃ per hour; when the temperature in the furnace reaches 800-850 ℃, preserving the heat for 2 hours; 6) naturally cooling along with the furnace, and tempering temperature: 240 ℃ and 260 ℃, duration: 1.4-1.8 hours. The HRC of the alloy grinding ball obtained in the embodiment can reach 52, and meanwhile, the alloy grinding ball has strong impact toughness and an impact value of 9J/cm 2. The falling ball impact fatigue life is more than or equal to 9400 times, and the breakage rate is less than 0.9 percent.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A low-chromium alloy grinding ball is characterized by comprising the following components: 2.0-3.3% of C, 1.75-2.2% of Si, 1.3-2.6% of Mn1.5-2.5% of Cr, 0.25-0.50% of Cu, 0.05-0.12% of Ti, 0.5-1% of graphene, less than or equal to 0.02% of S, less than or equal to 0.02% of P, and the balance of Fe.

2. The low chromium alloy grinding ball according to claim 1, comprising the following components: 2.8 percent of C, 2.0 percent of Si, 1.8 percent of Mn, 2 percent of Cr, 0.3 percent of Cu, 0.08 percent of Ti, less than or equal to 0.02 percent of S, 0.8 percent of graphene, less than or equal to 0.02 percent of P, and the balance of Fe.

3. The low chromium alloy grinding ball as claimed in claim 1, wherein the preparation method of said low chromium alloy grinding ball comprises the following steps: