WO2021035898A1 - Wear-resistant lining plate of bucket wheel machine hopper, and preparation method therefor - Google Patents

Abstract

A wear-resistant lining plate of a bucket wheel machine hopper, characterized in that the components, in percentages by mass, are: 0.5%-0.8% of carbon, 0.1%-0.3% of germanium, 1.5%-2.0% of manganese, 0.05%-0.1% of technetium, 0.2%-0.5% of copper, 0.4%-0.8% of zirconium, 0.05%-0.08% of tantalum, 0.01%-0.03% of yttrium, 0.02%-0.04% of holmium, 0.05%-0.1% of silicon boride, ≤0.03% of sulfur, ≤0.03% of phosphorus, the balance being iron. Further disclosed is a method for preparing the wear-resistant lining plate of a bucket wheel machine hopper. The wear-resistant lining plate of a bucket wheel machine hopper has the advantages of a higher hardness, wear resistance and impact toughness, greater fatigue resistance, and being able to effectively improve ball grinding efficiency.

Description

Wear-resistant lining plate of bucket wheel machine hopper and preparation method thereof Technical field

The invention relates to the technical field of metal materials, in particular to a wear-resistant lining plate of a bucket wheel machine hopper and a preparation method thereof.

Background technique

Bucket wheel stacker-reclaimer and mixing reclaimer are high-efficiency equipment for continuous loading and unloading of bulk materials in modern industry. Because of their dual functions of reclaiming and stacking, they are widely used in ports, wharves, metallurgy, cement, steel The stacking operations of bulk material storage yards such as factories, coking plants, coal storage plants, power plants, etc., can greatly improve production efficiency, such as stacking ore, coal, coke, sand and gravel.

When the bucket wheel stacker-reclaimer and the mixing reclaimer work, they rely on the bucket on the wheel body to directly act on the material for excavation and reclaiming. When the bucket excavates the material, the material enters the material through the cutting of the bucket blade. Bucket. Therefore, when the hopper is working, the bucket blade and the liner will generate a huge friction with the material, which will cause the blade and the liner to wear and cause the hopper to be damaged.

In current domestic practical applications, the mainstream materials of liner materials are high manganese steel, high chromium cast iron, and medium and low alloy steel. High manganese steel has good toughness, but its wear resistance and corrosion resistance are not ideal. High chromium cast iron has good wear resistance but poor toughness. The carbides and high-carbon martensite in it are brittle. Under certain impact conditions, it is prone to spalling and fracture, which seriously affects the normal operation of the equipment. The brittleness and corrosion resistance of low- and medium-alloy steel are not up to standard.

The Chinese invention patent with application publication number CN104060178A discloses a ball mill liner material and preparation method. The ball mill liner material disclosed in this patent has the following composition and mass percentage: C 0.25-2.0%, Cr 10-25%, Si 0.4 -2.0%, Mn 0.4-1.0%, Nb 0.1-2.0%, W 0.1-1.0%, P, S≤0.04%, Al 0.01-0.04%, Ce 0.2-0.3%, the balance is Fe. The ball mill liner material disclosed in the patent has certain impact toughness, but its hardness and hardenability still need to be further improved, and the heat treatment process is more complicated.

The Chinese invention patent with application publication number CN101045972A relates to a liner material, C: 0.45-0.55%, Si: 1.6-2.0%, Mn: 2.8-3.3%, P≤0.04%, S≤0.04%. The bainite structure obtained by controlling the heat treatment method, but because the material contains less alloying elements and low carbide content, the wear resistance needs to be further improved.

Therefore, it is very necessary to develop a wear-resistant liner for bucket wheel machines with high hardness, good wear resistance, excellent plasticity and toughness, and high fatigue strength.

Summary of the invention

In order to overcome the shortcomings in the prior art, the present invention provides a wear-resistant liner for a bucket wheel machine and a preparation method thereof. The preparation process is simple, easy to operate, and has a wide range of raw materials sources, which can significantly save energy and reduce economic losses; the prepared Bucket wheel machine hopper wear-resistant liner has the advantages of higher hardness, wear resistance and impact resistance toughness, greater fatigue resistance, and can effectively improve the efficiency of ball milling.

In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is a wear-resistant lining plate of a bucket wheel machine hopper, which is characterized in that the composition according to weight percentage is: carbon 0.5-0.8%, germanium 0.1-0.3%, manganese 1.5-2.0%, technetium 0.05-0.1%, copper 0.2-0.5%, zirconium 0.4-0.8%, tantalum 0.05-0.08%, yttrium 0.01-0.03%, holmium 0.02-0.04%, silicon boride 0.05-0.1%, sulfur ≤0.03%, phosphorus ≤0.03%, the balance is iron.

Further, the preparation method of the wear-resistant liner of the bucket wheel machine hopper includes the following steps:

Step S1: mix carbon, germanium, manganese, technetium, copper, zirconium, tantalum, yttrium, holmium, silicon boride, sulfur, and phosphorus according to weight percentages, and then place them in a ball mill for ball milling and mixing to obtain a mixture;

Step S2: Using pig iron and scrap steel as iron sources, adding the pig iron to an induction electric furnace for heating and melting, then performing desulfurization, deoxidation, and refining with a refining agent once, then adding the mixture prepared in step S1 for alloying, and then adding scrap steel Melt, add refining agent for secondary refining, detect and adjust the content of each component to qualified, keep it at 1450-1650°C for 3-5 hours to obtain alloy liquid;

Step S3: Pour the alloy liquid made in step S2 into a sand mold for casting, and cool the cast casting to 850-1000°C, quench it directly into oil, and perform oil-cooling quenching to obtain a casting liner;

Step S4: Put the cast liner into a heat treatment furnace for heat treatment to obtain a finished product.

Further, the rotation speed of the ball mill in step S1 is 180-220 rpm, and the ball milling time is 3-5 hours.

Further, the mass ratio of the pig iron to the scrap steel is 1:(1-3).

Further, the refining agent is made from the following raw materials in parts by weight: 3-6 parts by weight of cesium fluoroaluminate, 1-3 parts by sodium chloride, 0.5-1.5 parts by beryllium chloride, 2-4 parts by calcium sulfate, and magnesium nitrate 1-2 parts, 1-2 parts of pumice, 0.3-0.6 parts of graphene, 30-40 parts of tool steel powder.

Further, the preparation method of the refining agent includes the following steps: after the raw materials are mixed uniformly, heated to a molten state, then poured into pure water for chilling, and then pressed into a blank, after being calcined, crushed, and sieved, The refining agent is obtained.

Preferably, the pressure of the pressed compact is 10-16 MPa.

Preferably, the calcination is specifically: calcination at 900-1000°C for 3.5-5 hours.

Preferably, the mesh number of the sieving is 100-200 mesh.

Further, the specific process of the heat treatment in step S4 is as follows: first heat up from room temperature to 480-520°C at a rate of 180-200°C/hour, keep the temperature for 40-60 minutes; then heat up to 680°C at a rate of 190-210°C/hour -700℃, keep for 15-25 minutes; then increase the temperature to 940-960℃ at 200-210℃/hour, keep for 1-2 hours; then decrease the temperature to 450-500℃ at 170-180℃/hour, keep the temperature for 40- 60 minutes; then cool down to 250-300°C at a rate of 160-170°C/hour, hold for 3.5-6.5 hours; then slowly cool to 150°C with the furnace to get the final liner product.

The beneficial effects produced by adopting the above technical solutions are:

(1) The wear-resistant liner for the bucket wheel machine hopper provided by the present invention has a simple preparation process, easy operation, wide raw material sources, obvious energy saving, reduced economic losses, mild reaction conditions, and is suitable for large-scale production.

(2) The wear-resistant liner of the bucket wheel machine provided by the present invention overcomes the unsatisfactory wear resistance and corrosion resistance of the traditional high-manganese steel wear-resistant liner. The high-chromium cast iron wear-resistant liner has poor toughness and carbonization. The high-carbon martensite and high-carbon martensite are brittle. Under certain impact conditions, they are prone to spalling and fracture, which seriously affects the normal operation of the equipment. The low- and medium-alloy steel wear-resistant liner has neither brittleness nor corrosion resistance. Defects that meet the standard have the advantages of higher hardness, wear resistance, impact resistance, and greater fatigue strength, which can effectively improve the efficiency of ball milling.

(3) The wear-resistant liner of the bucket wheel machine hopper provided by the present invention is added with silicon boride to form a eutectic liquid phase with other alloys. During the casting process, it can not only inhibit the growth of alloy grains, but also play a role in dispersion strengthening It can greatly improve the hardness and wear resistance of the liner material, and improve its impact toughness; it has good wettability with the alloy matrix, which can effectively avoid the pores and microcracks that are easy to form in casting As well as the deposition and agglomeration of ceramic phases.

(4) The wear-resistant liner of the bucket wheel machine hopper provided by the present invention can reasonably control the process video, so that the quality of the finished product is more stable and uniform, and the overall performance is more excellent; it can significantly improve the yield, and will not produce pores and oxides on the surface of the casting; The internal defects of the liner material are effectively eliminated, the wear resistance and fatigue strength of the liner are improved, which is conducive to improving production efficiency; the addition of elements such as germanium, technetium, zirconium, tantalum, yttrium, holmium, etc., has a synergistic effect, It can further improve the overall performance of the material and improve the wear resistance to a greater extent.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, and to make the above-mentioned features, objectives, and advantages of the present invention clearer and easier to understand, the present invention will be further described below in conjunction with embodiments. The examples are only used to illustrate the present invention and not to limit the scope of the present invention.

The raw materials used in the examples of the present invention are all purchased commercially.

Example 1

A wear-resistant lining plate for a bucket wheel machine hopper, which is characterized in that the composition according to weight percentages is: carbon 0.5%, germanium 0.1%, manganese 1.5%, technetium 0.05%, copper 0.2%, zirconium 0.4%, tantalum 0.05% , Yttrium 0.01%, holmium 0.02%, silicon boride 0.05%, sulfur ≤0.03%, phosphorus ≤0.03%, and the balance is iron.

The preparation method of the wear-resistant lining plate of the bucket wheel machine hopper includes the following steps:

Step S1: mix carbon, germanium, manganese, technetium, copper, zirconium, tantalum, yttrium, holmium, silicon boride, sulfur, and phosphorus according to weight percentages, and then place them in a ball mill for ball milling and mixing to obtain a mixture; The rotating speed of the ball mill is 180 rpm, and the ball milling time is 3 hours;

Step S2: Using pig iron and scrap steel as iron sources, adding the pig iron to an induction electric furnace for heating and melting, then performing desulfurization, deoxidation, and refining with a refining agent once, then adding the mixture prepared in step S1 for alloying, and then adding scrap steel Melt, add refining agent for secondary refining, detect and adjust the content of each component to pass, keep it at 1450°C for 3 hours to obtain alloy liquid; the mass ratio of pig iron to scrap steel is 1:1;

Step S3: Pour the alloy liquid made in step S2 into a sand mold for casting, and cool the casting to 850°C, quench it into oil directly, and perform oil-cooling quenching to obtain a cast liner;

Step S4: Put the cast liner into a heat treatment furnace for heat treatment to obtain a finished product.

The refining agent is made of the following raw materials in parts by weight: 3 parts of cesium fluoroaluminate, 1 part of sodium chloride, 0.5 parts of beryllium chloride, 2 parts of calcium sulfate, 1 part of magnesium nitrate, 1 part of pumice, 0.3 parts of graphene , 30 copies of tool steel powder.

The preparation method of the refining agent includes the following steps: after the raw materials are mixed uniformly, heated to a molten state, then poured into pure water for chilling, and then pressed into a blank, after finishing, after calcining, crushing and sieving, the Refining agent; the pressure of the pressed compact is 10 MPa; the calcination is specifically: calcination at 900° C. for 3.5 hours; the mesh number of the sieving is 100 mesh.

The specific process of the heat treatment in step S4 is as follows: firstly increase the temperature from room temperature to 480°C at a rate of 180°C/hour and keep the temperature for 40 minutes; then increase the temperature to 680°C at a rate of 190°C/hour and keep the temperature for 15 minutes; Increase the temperature to 940°C for 1 hour and keep it warm for 1 hour; then cool it down to 450°C at 170°C/hour and keep it warm for 40 minutes; then cool it down to 250°C at 160°C/hour and keep it warm for 3.5 hours; then slowly cool to 150°C with the furnace The final liner product is obtained after the furnace is released.

Example 2

A wear-resistant liner for a bucket wheel machine hopper, which is characterized in that the composition according to weight percentages is: carbon 0.6%, germanium 0.15%, manganese 1.6%, technetium 0.06%, copper 0.3%, zirconium 0.5%, tantalum 0.06% , Yttrium 0.015%, holmium 0.025%, silicon boride 0.06%, sulfur ≤ 0.03%, phosphorus ≤ 0.03%, and the balance is iron.

The preparation method of the wear-resistant lining plate of the bucket wheel machine hopper includes the following steps:

Step S1: mix carbon, germanium, manganese, technetium, copper, zirconium, tantalum, yttrium, holmium, silicon boride, sulfur, and phosphorus according to weight percentages, and then place them in a ball mill for ball milling and mixing to obtain a mixture; The rotating speed of the ball mill is 190 rpm, and the ball milling time is 3.5 hours;

Step S2: Using pig iron and scrap steel as iron sources, adding the pig iron to an induction electric furnace for heating and melting, then performing desulfurization, deoxidation, and refining with a refining agent once, then adding the mixture prepared in step S1 for alloying, and then adding scrap steel Melt, add a refining agent for secondary refining, detect and adjust the content of each component to pass, and keep it at 1500°C for 3.5 hours to obtain an alloy liquid; the mass ratio of the pig iron to the scrap steel is 1:1.5;

Step S3: Pour the alloy liquid made in step S2 into a sand mold for casting, and cool the cast casting to 900° C., quench it into oil directly, and perform oil-cooling quenching to obtain a cast liner;

Step S4: Put the cast liner into a heat treatment furnace for heat treatment to obtain a finished product.

The refining agent is made of the following raw materials in parts by weight: 4 parts of cesium fluoroaluminate, 1.5 parts of sodium chloride, 0.8 parts of beryllium chloride, 2.5 parts of calcium sulfate, 1.3 parts of magnesium nitrate, 1.3 parts of pumice, 0.4 parts of graphene , 33 parts of tool steel powder.

The preparation method of the refining agent includes the following steps: after the raw materials are mixed uniformly, heated to a molten state, then poured into pure water for chilling, and then pressed into a blank, after finishing, after calcining, crushing and sieving, the Refining agent; the pressure of the pressed compact is 12 MPa; the calcination is specifically: calcination at 930° C. for 4 hours; the mesh number of the sieving is 130 mesh.

The specific process of heat treatment in step S4 is as follows: firstly increase the temperature from room temperature to 490°C at a rate of 185°C/hour and keep the temperature for 45 minutes; then increase the temperature to 685°C at a rate of 195°C/hour and keep the temperature for 17 minutes; Increase the temperature to 945°C in 1 hour and keep it for 1.2 hours; then decrease the temperature to 460°C at a rate of 173°C/hour and keep it for 45 minutes; then decrease the temperature to 265°C at a rate of 163°C/hour and keep it for 4 hours; then slowly cool to 150°C with the furnace The final liner product is obtained after the furnace is released.

Example 3

A wear-resistant liner for a bucket wheel machine hopper, which is characterized in that the composition in terms of weight percentage is: carbon 0.65%, germanium 0.2%, manganese 1.7%, technetium 0.08%, copper 0.35%, zirconium 0.65%, tantalum 0.065% , Yttrium 0.02%, holmium 0.03%, silicon boride 0.08%, sulfur ≤0.03%, phosphorus ≤0.03%, and the balance is iron.

The preparation method of the wear-resistant lining plate of the bucket wheel machine hopper includes the following steps:

Step S1: mix carbon, germanium, manganese, technetium, copper, zirconium, tantalum, yttrium, holmium, silicon boride, sulfur, and phosphorus according to weight percentages, and then place them in a ball mill for ball milling and mixing to obtain a mixture; The rotating speed of the ball mill is 200 rpm, and the ball milling time is 4 hours;

Step S2: Using pig iron and scrap steel as iron sources, adding the pig iron to an induction electric furnace for heating and melting, then performing desulfurization, deoxidation, and refining with a refining agent once, then adding the mixture prepared in step S1 for alloying, and then adding scrap steel Melt, add a refining agent for secondary refining, detect and adjust the content of each component to pass, keep it at 1530°C for 4 hours to obtain an alloy liquid; the mass ratio of the pig iron to the scrap steel is 1:2;

Step S3: Pour the alloy liquid made in step S2 into a sand mold for casting, and the casting after casting is cooled to 930°C, quenched directly into oil, and quenched by oil to obtain a cast liner;

Step S4: Put the cast liner into a heat treatment furnace for heat treatment to obtain a finished product.

The refining agent is made of the following raw materials by weight: 4.5 parts by weight of cesium fluoroaluminate, 2 parts by sodium chloride, 1.2 parts by beryllium chloride, 3 parts by calcium sulfate, 1.5 parts by magnesium nitrate, 1.5 parts by pumice, 0.45 parts by graphene , 35 copies of tool steel powder.

The preparation method of the refining agent includes the following steps: after the raw materials are mixed uniformly, heated to a molten state, then poured into pure water for chilling, and then pressed into a blank, after finishing, after calcining, crushing and sieving, the Refining agent; the pressure of the pressed compact is 13 MPa; the calcination is specifically: calcination at 950° C. for 4.3 hours; the mesh number of the sieving is 150 mesh.

The specific process of the heat treatment in step S4 is as follows: first heat up from room temperature to 500°C at a rate of 190°C/hour and hold for 50 minutes; then heat up to 690°C at a rate of 200°C/hour and hold for 20 minutes; and then heat up to 205°C/hour. Increase the temperature to 950°C for 1.5 hours; then decrease the temperature to 480°C at a rate of 175°C/hour and hold for 50 minutes; then decrease the temperature to 270°C at a rate of 165°C/hour and hold for 5 hours; then slowly cool to 150°C with the furnace The final liner product is obtained after the furnace is released.

Example 4

A wear-resistant liner for a bucket wheel machine hopper, which is characterized in that the composition according to weight percentages is: carbon 0.73%, germanium 0.25%, manganese 1.9%, technetium 0.09%, copper 0.45%, zirconium 0.7%, tantalum 0.07% , Yttrium 0.03%, holmium 0.035%, silicon boride 0.09%, sulfur ≤ 0.03%, phosphorus ≤ 0.03%, and the balance is iron.

The preparation method of the wear-resistant lining plate of the bucket wheel machine hopper includes the following steps:

Step S1: mix carbon, germanium, manganese, technetium, copper, zirconium, tantalum, yttrium, holmium, silicon boride, sulfur, and phosphorus according to weight percentages, and then place them in a ball mill for ball milling and mixing to obtain a mixture; The rotating speed of the ball mill is 210 rpm, and the ball milling time is 4.5 hours;

Step S2: Using pig iron and scrap steel as iron sources, adding the pig iron to an induction electric furnace for heating and melting, then performing desulfurization, deoxidation, and refining with a refining agent once, then adding the mixture prepared in step S1 for alloying, and then adding scrap steel Melt, add refining agent for secondary refining, detect and adjust the content of each component to pass, keep it at 1600°C for 4.5 hours to obtain alloy liquid; the mass ratio of pig iron to scrap is 1:2.8;

Step S3: Pour the alloy liquid made in step S2 into a sand mold for casting, and the casting after casting is cooled to 960°C, quenched directly into oil, and quenched by oil to obtain a cast liner;

Step S4: Put the cast liner into a heat treatment furnace for heat treatment to obtain a finished product.

The refining agent is made of the following raw materials by weight: 5.5 parts by weight of cesium fluoroaluminate, 2.7 parts by sodium chloride, 1.4 parts by beryllium chloride, 3.8 parts by calcium sulfate, 1.8 parts by magnesium nitrate, 1.8 parts by pumice, 0.55 parts by graphene , 38 copies of tool steel powder.

The preparation method of the refining agent includes the following steps: after the raw materials are mixed uniformly, heated to a molten state, then poured into pure water for chilling, and then pressed into a blank, after finishing, after calcining, crushing and sieving, the Refining agent; the pressure of the pressed compact is 15MPa; the calcination is specifically: calcination at 990° C. for 4.8 hours; the mesh number of the sieving is 190 mesh.

The specific process of the heat treatment in step S4 is as follows: first heat up from room temperature to 510°C at a rate of 195°C/hour and hold for 55 minutes; then heat up to 695°C at a rate of 205°C/hour and hold for 23 minutes; then heat up to 209°C/hour Increase the temperature to 957°C in 1 hour and keep for 1.8 hours; then decrease the temperature to 490°C at a rate of 178°C/hour and keep the temperature for 58 minutes; then decrease the temperature to 290°C at a rate of 168°C/hour and keep the temperature for 6 hours; then slowly cool to 150°C with the furnace The final liner product is obtained after the furnace is released.

Example 5

A wear-resistant liner for a bucket wheel machine hopper, which is characterized in that the composition according to weight percentages is: carbon 0.8%, germanium 0.3%, manganese 2.0%, technetium 0.1%, copper 0.5%, zirconium 0.8%, tantalum 0.08% , Yttrium 0.03%, Holmium 0.04%, Silicon boride 0.1%, Sulfur ≤0.03%, Phosphorus ≤0.03%, and the balance is iron.

The preparation method of the wear-resistant lining plate of the bucket wheel machine hopper includes the following steps:

Step S1: mix carbon, germanium, manganese, technetium, copper, zirconium, tantalum, yttrium, holmium, silicon boride, sulfur, and phosphorus according to weight percentages, and then place them in a ball mill for ball milling and mixing to obtain a mixture; The rotating speed of the ball mill is 220 rpm, and the ball milling time is 5 hours;

Step S2: Using pig iron and scrap steel as iron sources, adding the pig iron to an induction electric furnace for heating and melting, then performing desulfurization, deoxidation, and refining with a refining agent once, then adding the mixture prepared in step S1 for alloying, and then adding scrap steel Melt, add a refining agent for secondary refining, detect and adjust the content of each component to pass, keep it at 1650°C for 5 hours to obtain an alloy liquid; the mass ratio of the pig iron to the scrap steel is 1:3;

Step S3: Pour the alloy liquid made in step S2 into a sand mold for casting, and cool the casting to 1000°C, quench it directly into oil, and perform oil-cooling quenching to obtain a casting liner;

Step S4: Put the cast liner into a heat treatment furnace for heat treatment to obtain a finished product.

The refining agent is made of the following raw materials in parts by weight: 6 parts of cesium fluoroaluminate, 3 parts of sodium chloride, 1.5 parts of beryllium chloride, 4 parts of calcium sulfate, 2 parts of magnesium nitrate, 2 parts of pumice, and 0.6 parts of graphene. , 40 parts of tool steel powder.

The preparation method of the refining agent includes the following steps: after the raw materials are mixed uniformly, heated to a molten state, then poured into pure water for chilling, and then pressed into a blank, after finishing, after calcining, crushing and sieving, the Refining agent; the pressure of the pressed compact is 16MPa; the calcination is specifically: calcination at 1000° C. for 5 hours; the mesh number of the sieving is 200 mesh.

The specific process of heat treatment in step S4 is as follows: first heat up from room temperature to 520°C at a rate of 200°C/hour and hold for 60 minutes; then heat up to 700°C at a rate of 210°C/hour and hold for 25 minutes; and then heat up to 210°C/hour. Increase the temperature to 960°C for 2 hours; then decrease the temperature to 500°C at a rate of 180°C/hour and keep the temperature for 60 minutes; then decrease the temperature to 300°C at a rate of 170°C/hour and keep the temperature for 6.5 hours; then slowly cool to 150°C with the furnace The final liner product is obtained after the furnace is released.

Comparative example 1

This example provides a wear-resistant liner for the hopper of a bucket wheel machine. The formula and preparation method are basically the same as those in Example 1, except that no germanium is added.

Comparative example 2

This example provides a wear-resistant liner for the hopper of a bucket wheel machine. The formula and preparation method are basically the same as those in Example 1, except that technetium is not added.

Comparative example 3

This example provides a wear-resistant liner for the hopper of a bucket wheel machine. The formula and preparation method are basically the same as those in Example 1, except that no zirconium is added.

Comparative example 4

This example provides a wear-resistant liner for the hopper of a bucket wheel machine. The formula and preparation method are basically the same as those in Example 1, except that no tantalum is added.

Comparative example 5

This example provides a wear-resistant liner for the hopper of a bucket wheel machine. The formula and preparation method are basically the same as those in Example 1, except that holmium is not added.

Comparative example 6

This example provides a wear-resistant liner for the hopper of a bucket wheel machine. The formula and preparation method are basically the same as those in Example 1, except that no silicon boride is added.

Comparative example 6

This example provides a wear-resistant liner for the hopper of a bucket wheel machine. The formula and preparation method are basically the same as those in Example 1, except that no silicon boride is added.

Comparative example 7

This example provides a wear-resistant liner for the hopper of a bucket wheel machine, which is made according to the formula and preparation method of Example 1 of the Chinese invention patent application number 201711074979.7.

Performance tests were performed on the samples prepared in the foregoing Examples 1-5 and Comparative Examples 1-7, and the test methods and test results are shown in Table 1.

Table 1

Test items	hardness	Tensile Strength	L	Bending strength
unit	HR10/392	MPa	mm/100H	MPa
testing method	JB/T8133.3-1999	GB/T23805-2009	GB/T12444.1-1990	GB/T4741-1999
Example 1	94.0	483	0.10	1850
Example 2	94.2	488	0.09	1880
Example 3	94.5	492	0.09	1900
Example 4	94.7	495	0.07	1910
Example 5	95.0	500	0.06	1930
Comparative example 1	89.3	450	0.15	1630
Comparative example 2	89.0	453	0.17	1620
Comparative example 3	88.7	448	0.16	1600
Comparative example 4	88.5	452	0.14	1590
Comparative example 5	87.9	445	0.18	1520
Comparative example 6	87.5	450	0.16	1610
Comparative example 7	89.0	435	0.20	1500

It can be seen from Table 1 that the wear-resistant liner of the bucket wheel machine hopper disclosed in the embodiment of the present invention has higher tensile strength, hardness, and bending strength, and its wear resistance is better, which is the synergistic effect of each component the result of.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and the specification describe only the principles of the present invention. The present invention may have various forms without departing from the spirit and scope of the present invention. Changes and improvements, these changes and improvements fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. A wear-resistant liner for a bucket wheel machine hopper, which is characterized in that the composition in terms of weight percentage is: carbon 0.5-0.8%, germanium 0.1-0.3%, manganese 1.5-2.0%, technetium 0.05-0.1%, copper 0.2- 0.5%, zirconium 0.4-0.8%, tantalum 0.05-0.08%, yttrium 0.01-0.03%, holmium 0.02-0.04%, silicon boride 0.05-0.1%, sulfur ≤0.03%, phosphorus ≤0.03%, and the balance is iron.
2. A method for preparing a wear-resistant liner of a bucket wheel machine hopper is characterized in that it comprises the following steps:

   Step S1: mix carbon, germanium, manganese, technetium, copper, zirconium, tantalum, yttrium, holmium, silicon boride, sulfur, and phosphorus according to weight percentages, and then place them in a ball mill for ball milling and mixing to obtain a mixture;

   Step S2: Using pig iron and scrap steel as iron sources, adding the pig iron to an induction electric furnace for heating and melting, then performing desulfurization, deoxidation, and refining with a refining agent once, then adding the mixture prepared in step S1 for alloying, and then adding scrap steel Melt, add refining agent for secondary refining, detect and adjust the content of each component to qualified, keep it at 1450-1650°C for 3-5 hours to obtain alloy liquid;

   Step S3: Pour the alloy liquid made in step S2 into a sand mold for casting, and cool the cast casting to 850-1000°C, quench it directly into oil, and perform oil-cooling quenching to obtain a casting liner;

   Step S4: Put the cast liner into a heat treatment furnace for heat treatment to obtain a finished product.
3. The method for preparing a wear-resistant liner for a bucket wheel machine hopper according to claim 2, characterized in that, in step S1, the rotation speed of the ball mill is 180-220 rpm, and the ball milling time is 3-5 hours.
4. The method for preparing a wear-resistant liner for a bucket wheel machine hopper according to claim 2, wherein the mass ratio of the pig iron to the scrap steel is 1:(1-3).
5. The method for preparing a wear-resistant liner of a bucket wheel machine hopper according to claim 2, wherein the refining agent is made of the following parts by weight of raw materials: 3-6 parts of cesium fluoroaluminate, 1 part of sodium chloride -3 parts, 0.5-1.5 parts of beryllium chloride, 2-4 parts of calcium sulfate, 1-2 parts of magnesium nitrate, 1-2 parts of pumice, 0.3-0.6 parts of graphene, 30-40 parts of tool steel powder.
6. According to claim 5, a method for preparing wear-resistant liners for bucket wheel machines, wherein the method for preparing the refining agent comprises the following steps: after the raw materials are uniformly mixed, heated to a molten state, and then poured For example, it is chilled in pure water, then pressed into a blank, and then calcined, crushed and sieved to obtain the refining agent.
7. The method for preparing a wear-resistant liner of a bucket wheel machine hopper according to claim 6, wherein the pressure of the pressed compact is 10-16 MPa; and the calcination is specifically: calcination at 900-1000°C for 3.5 -5 hours; the number of meshes sieved is 100-200 meshes.
8. The method for preparing a wear-resistant liner of a bucket wheel machine hopper according to claim 2, wherein the specific process of the heat treatment in step S4 is: first heating from room temperature to 480-200°C/hour at a rate of 180-200°C/hour. 520℃, keep for 40-60 minutes; then heat up to 680-700℃ at a rate of 190-210℃/hour, keep for 15-25 minutes; then heat up to 940-960℃ at 200-210℃/hour, keep for 1-2 Hours; then cool down to 450-500°C at a rate of 170-180°C/hour and hold for 40-60 minutes; then cool down to 250-300°C at a rate of 160-170°C/hour and hold for 3.5-6.5 hours; then slowly follow the furnace Cool down to 150°C to get the final liner product.