KR20220122058A - Wear plate and wear ring for pumping car and making method thereof - Google Patents

Abstract

The present invention relates to a wear plate and a wear ring for a pump car, which greatly improve wear resistance, and to a manufacturing method thereof. The wear plate and wear ring used in a concrete pump car comprises: C of 0.3 to 0.8 wt%; Mn of 8 to 12 wt%; Cr of 4 to 6 wt%; Ni of 4 to 8 wt%; Si of 2 to 4 wt%; B of 0.3 to 0.5 wt%; Ce of 0.05 to 0.1 wt%; Mg of 0.05 to 0.1 wt%; and the rest of alloy including other unavoidable impurities and iron.

Description

Wear plate and wear ring for pump car and manufacturing method thereof

The present invention relates to a wear plate and a wear ring used in a concrete pump car, and by inserting and fixing a wear-resistant member on the body surface, a wear plate and a wear ring used in a pump car that can greatly improve abrasion resistance and simplify the manufacturing process, and manufacturing thereof it's about how

A pump car is an equipment that transports cement concrete slurry {Slurry} to a high-rise building or a worksite far away. The pump for pumping cement concrete has two cylinders {Cylinder} and a piston {Piston} on the left and right, and the wear plate is installed here, and the S-valve assembled with the transfer pipeline {Pipe Line} The one connected to the -Valve is the Wear Ring.

1 shows a wear plate {10} and a wear ring {30}. The wear plate {10} has a shape in which a pair of through holes {11} {12} are formed on both sides, and the wear ring {30} has a structure that is closely assembled to the upper flange part {22} of the wear plate {10}. have.

This wear ring {30} moves between the left and right pumps while making surface contact with the upper flanges {22} of the through holes {11} and {12} of the wear plate {10} to transfer the mixed liquid cement concrete. It acts as an outlet. In this way, the wear plate {10} and the wear ring {30} in surface contact cause friction between metals, and also friction with gravel or sand contained in the cement concrete, resulting in severe wear. In addition, since cement is strongly basic, a chemical reaction occurs and wear due to corrosion occurs.

In order to cope with these physical and chemical wear characteristics, a method of attaching a wear-resistant material made of cemented carbide or the like to the wear-resistant surface of the wear plate and the wear ring body by welding or directly manufacturing it by a powder metallurgy method has been used.

As a representative method, there is Patent No. 10-1777552, which, as shown in FIGS. 2 and 3, a wear plate ring {200} inserted into a pair of base holes {120} formed in the base {100}; A wear-resistant assembly for a pump car comprising a wear ring {300} having a size corresponding to the wear plate ring {200} and a spacer {400} fixed between the wear plate ring {200} is proposed.

Here, the wear plate ring {200} and the wear ring {300} are 2 to 5 wt% of carbon {Carbon}, 0.4 to 1.5 wt% of silicon {Silicon}, 0.3 to 2 wt% of manganese {Manganese}, 6 to 12% by weight of vanadium {Vanadium}, 2 to 12% by weight of molybdenum {Molybdenum}, 3 to 12% by weight of tungsten {Tungsten}, 2 to 8% by weight of columbium {Columbium}, 2 to 8% by weight of cobalt A metallic material containing {Cobalt}, 2 to 6 wt% of chromium {Chromium}, 0.1 to 1 wt% of titanium {Titanium}, 0.1 to 0.2 wt% of cerium {Cerium} and the remaining unavoidable impurities and iron {Fe} manufactured by centrifugal casting,

The spacer {400} is a part rubbed together with the wear plate ring {200} by the wear ring {300}, and since centrifugal casting is difficult, it is manufactured by powder metallurgy using spent carbide or waste cemented carbide powder to improve wear resistance, , has a structure that is fixed to the wear plate using a fastening member.

However, this technology makes wear plate rings and wear rings by centrifugally casting high-speed steel instead of carbide for wear-resistant members, and has a structure in which a spacer manufactured by powder metallurgy is separately fixed to the body. There is a defect that it is broken by an accident or separated from the body by a fixed part.

The present invention is to solve the above problems, and the body part is made of an alloy that has excellent wear resistance and can be manufactured by centrifugal casting method injected in the state of molten iron, and the surface area requiring wear resistance has a value. An object of the present invention is to provide a wear plate and a wear ring used in a pump car, and a manufacturing method thereof, which can be inserted and fixed into the body using cheap super-hard materials or waste materials, which can increase the service life and significantly reduce the price.

A wear plate and a wear ring used in the concrete pump car of the present invention for achieving the above object,

The body is 0.3% to 0.8% of carbon {C} by weight, 8% to 12% of manganese {Mn}, 4% to 6% of chromium {Cr}, 4% to 8% of nickel {Ni}, and silicon {Si} is 2%~4%, boron {B} is 0.3%~0.5%, cerium {Ce} is 0.05%~0.1%, magnesium {Mg} is 0.05%~0.1%, other unavoidable impurities and iron alloy composition It is made of a casting of

The wear-resistant member is one or more selected from SiC, TiC, WC, CBN, Si3N4, and waste carbide tip, and the shape is circular or square, and the size is 10 to 20 mm in diameter or horizontal and vertical, and the thickness is It is 2 to 6 mm, and is characterized in that it is inserted and welded at a distribution rate of 30 to 60% per area of the body surface.

In addition, the manufacturing method of the wear plate and the wear ring used in the concrete pump car of the present invention,

preparing a mold for casting the body of the wear plate and the wear ring;

fixing the wear-resistant member to the inner space of the mold;

In the mold to which the wear-resistant member is fixed, 0.3% to 0.8% of carbon {C} by weight, 8% to 12% of manganese {Mn}, 4% to 6% of chromium {Cr}, and 4% to 6% of nickel {Ni} 4%~8%, silicon {Si} 2%~4%, boron {B} 0.3%~0.5%, cerium {Ce} 0.05%~0.1%, magnesium {Mg} 0.05%~0.1% etc. Casting a body by injecting and solidifying a molten metal having an alloy composition of unavoidable impurities and iron;

a heat treatment step of heating and quenching the cast body in a heating furnace;

It characterized in that it consists of a step of manufacturing the finished product by roughing and finishing machining the heat-treated body,

In the step of casting the body, the injection of molten metal is carried out at 1450 ° C to 1550 ° C,

The heat treatment step is characterized in that water quenching after heating to 1050 ~ 1100 ℃ in a heating furnace,

The mold is a self-hardening mold,

The wear-resistant member is one or more selected from SiC, TiC, WC, CBN, Si3N4, and waste carbide tip, and is inserted and fixed in the self-hardening mold.

According to the present invention, the body of the present invention wear plate and wear ring is made of high manganese special steel material with very good wear resistance, melted in a high-frequency induction furnace, and then manufactured in one piece by sand casting (Sand Casting) or mold casting. The effect of inserting a wear-resistant member into the surface of the casting to be made, but using a cheap material for the wear-resistant member or using a defective product or a waste cutting tool, the manufacturing process is very simple and the material cost is low, so that the total manufacturing cost can be greatly reduced there is

1 is a perspective view of a conventional wear plate and a wear ring Figure 2 is an exploded view of a conventional wear plate 3 is a perspective view of a conventional wear ring Figure 4 is a perspective view of the present invention wear plate and wear ring

The wear plate {10} and the wear ring {30} of the present invention are shown in FIG.

According to Figure 4, the wear-resistant member {24} is inserted and fixed to the wear-resistant surface {20} of the wear plate {10}, that is, the entire wear-resistant surface that is in contact with the lower surface of the wear ring {30}, that is, the wear plate. A wear-resistant member like the one is inserted and fixed.

The body of the wear plate {10} and the wear ring {30} of the present invention contains 0.3% to 0.8% of carbon {C}, 8% to 12% of manganese {Mn}, and 4% to 6% of chromium {Cr} by weight. %, nickel {Ni} 4% to 8%, silicon {Si} 2% to 4%, boron {B} 0.3% to 0.5%, cerium {Ce} 0.05% to 0.1%, magnesium {Mg} It is made of a cast product of this 0.05% to 0.1% other unavoidable impurities and an alloy composition of iron, and a wear-resistant member {24} is inserted and welded to the surface of the body,

The wear-resistant member {24} is used at least one selected from SiC, TiC, WC, CBN, Si3N4 and waste carbide tip, the shape of which is circular or square, and the size is 10 to 20 mm in diameter or horizontal and vertical. , the thickness is 2 to 6 mm, and the wear-resistant member {24} is characterized in that it is inserted and welded at a distribution rate of 30 to 60% per area of the body surface.

One of the most important technical matters in the present invention is an alloy steel material used as the body of the wear plate and the wear ring. The most important property of the material for the body is wear resistance, and it should be superior or equal to the wear resistance of Stellite used as an existing welding material.

Next, the price should be low, because the entire base plate is used as a sugar alloy material. If the alloy cost is high, the price increases. Also, castability must be excellent. Since the shape of the base plate is not complicated or thin, castability is not so important, but the fluidity of the molten metal must be good because it must easily cover the wear-resistant members such as SiC, TiC, WC, and cBN.

As a material having these necessary physical properties, in the present invention, the carbon {C} component is 0.3% to 1.0% by weight, silicon {Si} is 2% to 4%, chromium {Cr} is 4% to 6%, manganese { 8% to 12% of Mn}, 4% to 8% of nickel {Ni}, 0.2% to 0.4% of boron {B}, 0,05% to 0.1% of cerium {Ce}, and 0.01% of magnesium {Mg} % to 0.03%, aluminum {Al} is 0.15% to 0.3%, and the remainder is an alloy steel made of unavoidable impurities {sulfur, phosphorus, etc.} and iron {Fe}.

In the present invention, carbon is an essential component constituting carbide {Carbide}, and all carbides are intermetallic compounds having very high hardness, so they are alloyed to serve to increase wear resistance. Since sugar material is a material with a very high work hardening phenomenon, it has high abrasion resistance even if the amount of carbide is small. However, it is advantageous to reduce carbon to 0.1% or less for parts that need to increase impact resistance, but it is advantageous to increase carbon when wear resistance is more important. In the Wear Plate and Wear Ring, which are products of the present invention, impact strength is also important, but wear resistance is more important, so the C component is limited to 0.3% to 1.0%. If the carbon content is less than 0.3%, the abrasion resistance will decrease, and if it is more than 1.0%, the impact strength will decrease.

Here, the reason why silicon {Si} is limited to 2% to 4% is that Si has an excellent deoxidation effect and greatly lowers the melting point {Melting Point} of the sugar alloy by eutectic reaction with Fe, Mn, Ni, etc. give. When the melting point is lowered, the fluidity of the molten metal is improved, and thus the castability is greatly improved. This is because castability is very important in the present invention, and bonding strength is improved only when castability is good for welding with the insert tip, which is the wear-resistant member. Because of these properties, silicon {Si} is alloyed with 2% to 4%, and even if it is 2% or less, there is no problem in deoxidation, but in terms of castability, 2% or more and 4% showed the best effect. When Si exceeds 4%, silicon ferrite structure may appear and brittleness may occur, so it is limited to 4%.

Here, manganese {Mn} is the most powerful element that stabilizes the austenite structure together with nickel. It is also the most powerful element causing work hardenability. Hadfield Steel, which is used as a wear-resistant material for tooth plates that crush rock or gravel such as Jaw Crasher and Con Crusher, is a representative high manganese steel. The initial austenite hardness is Brinell hardness, which is about HB200, but when it receives impact or frictional energy, its hardness increases to around HB600. This is because the austenite structure is transformed into a martensite structure.

The reason for alloying Mn in the present invention is to increase wear resistance due to the work hardening phenomenon.

In order to obtain a complete austenite structure at room temperature, Mn should be 8% or more, and in order to maximize work hardening, it is preferable to alloy Mn at 14% or more. to 12%. If Mn is alloyed with more than 12%, it is limited to 12% or less because brittleness occurs due to interaction with chromium.

Here, chromium {Cr} is alloyed to increase strength and initial hardness, and is also limited to 4% to 8% by weight. Chromium combines with carbon or boron to form chromium carbide or chromium boride, and these compounds increase strength and hardness and play a role in increasing the abrasion resistance of sugar materials. In Hadfield Steel, even if the content of chromium is alloyed with 2% or 3%, there is an effect of increasing the wear resistance.

In the wear plate and wear ring of the present invention, it is somewhat insufficient to obtain abrasion resistance comparable to that of stellite, so the minimum chromium content is 4% or more and the upper limit is limited to 8% or less because of the phenomenon that brittleness increases at 8% or more. limited

Here, nickel {Ni} is a strong austenite stabilizing element along with manganese and an important element that causes work hardening. Nickel is superior to manganese in increasing the toughness and strength of the alloy, and while manganese steel has a defect that the yield strength is low compared to the tensile strength, nickel does not cause a rapid decrease in yield strength. Although it is 4 to 5 times more expensive than manganese, in the alloy of the present invention, in addition to the role of easily promoting work hardening, it has an excellent effect in increasing hardness by precipitation hardening by combining with boron, so 4% to 6% of the alloy is used. If the Ni content is less than 4%, it is difficult to obtain 100% austenite structure at room temperature, and if it is alloyed with more than 6% Ni, the austenite structure is excessively stabilized and the martensite transformation is slowed down, resulting in poor wear resistance. Also, since it is the most expensive element in sugar alloys, the cost increases.

Here, boron {B} is alloyed with 0.3% to 0.5%, and boron is combined with carbon to form boron carbide, or combined with Cr, Ni, Mn, etc. to form boride. Boron has properties very similar to carbon and acts as a complement to carbon. Compared to carbon, boron plays a role in making crystal grains finer, and the impact strength, tensile strength, and corrosion resistance are much better when mixed than carbon alone. In general boron steel, boron is alloyed with about 0.0005% to 0.005% of boron for the purpose of increasing hardenability, but in sugar alloys, boron is alloyed to increase work hardenability by forming boride and to increase wear resistance by precipitation hardening. If the boron content is 0.3% or less, the effect decreases, and if the boron content is 0.5% or more, it is useful to increase the initial hardness, but there is a defect that brittleness occurs after martensite transformation, so it is limited to 0.5%.

Here, the reason for alloying about 0.1% to 0.2% of cerium {Ce}, which is a rare earth metal, is that cerium is a strong desulfurization and deoxidizing agent and improves impact strength and tensile strength by refining crystal grains. By using an expensive element or Fe-Si-Mg-Ce ferroalloy used as a spheroidizing agent for nodular graphite cast iron, it can be alloyed cheaply.

Here, magnesium {Mg} is a strong deoxidizing and desulfurizing agent, and alloying in 0.01% to 0.03% is an additional residual element due to the use of the Fe-Si-Mg-Ce ferroalloy.

Since magnesium has very strong oxidizing power and the evaporation temperature is only 1,104 °C, pure magnesium cannot be alloyed. Therefore, it is necessary to use a spheroidizing agent for nodular graphite cast iron made of Fe-Si-Mg-Ce, and it is impossible to directly put it into an induction furnace.

Here, SiC, an ultra-hard material for inserts used as a wear-resistant member, is silicon carbide, and its hardness is about HV2,800 and its specific gravity is 3.21. This SiC has very high hardness, so it has excellent wear resistance and low price. However, it has a drawback in that it has poor intermetallic wettability.

TiC is titanium carbide {Titanium Carbide}, its hardness is HV3,200 and specific gravity is 4.93. TiC also has excellent wear resistance and the price to weight ratio is less than 50% of that of WC, but the wettability is poor.

cBN is Cubic Boron Nitride, which has a hardness of HV4,500 and a specific gravity of 3.45. cBN{Cubic Boron Nitride} is the second highest hardness material after diamond, and its abrasion resistance is also second to that of diamond. The drawback is that the price is rather high and the wetability is poor.

WC, a cemented carbide material, is tungsten carbide, and its hardness is HV1,800~HV2,300, and its specific gravity is 15.4. In fact, the hardness of the carbide state is about HV1,050 ~ HV1,350. The biggest drawback is that the price is relatively high due to its high specific gravity, but the advantage is that it has good wettability.

As the wear-resistant member used in the present invention, SiC, TiC, cBN, WC, etc. may be selectively used, or two or three kinds may be used together. The cemented carbide material to be used in the present invention uses a coin-shaped circular or polygonal shape, and its size is 3 to 7 mm in an area of about 1 cm to 1.5 cm in width and height.

The most ideal shape is the shape of a thinly cut pipe or the shape of a leaf coin, the diameter of which is 10 mm to 20 mm, and the thickness is also 3 mm to 7 mm. The reason for limiting the size of the carbide material, which is a wear-resistant member, to the above size is to prevent the carbide material from breaking due to impact during use as it is molded into the wear plate body and the wear ring body.

The wear-resistant member is molded in the base metal surface layer, and when the plate surface and the ring surface cause mutual friction, it acts as a bearing and at the same time as a tooth to prevent wear. At this time, if the shape of the wear-resistant member is an angular shape, it may cause breakage in a side impact, so the circular shape is good, but if the size of the member is not large, it is not a problem. However, if it is cylindrical, it is much more advantageous to overcome the impact strength.

The wear-resistant member formed of SiC, TiC, cBn, and WC is a new material, a defective material that occurs during manufacturing, or a cutting tool tip that is discarded after use. This is because these wear-resistant members are embedded in the surface of the wear plate or wear ring and only play the role of bearing and super-hard teeth that do not wear out. Among them, the most desirable material is a waste cutting tool tip, which is very cheap compared to new materials. In addition, the waste cutting tool TiP contains TiC, cBn, WC, etc. alone or in combination of two or three, so that it has high hardness and excellent wettability.

In the method of inserting the wear-resistant member, which is the carbide material, on the upper surface of the wear plate and the wear ring, in the case of the existing carbide product, it was produced by manual stellite welding, but in the present invention, the Mn-Cr-Ni-Si-B The wear-resistant member is automatically wrapped in molten iron and completely inserted by directly casting molten iron made of abrasive alloy steel and injecting it directly into the wear-resistant member that has been set in the sand mold in advance.

In addition, the manufacturing method of the wear plate and the wear ring used in the concrete pump car of the present invention comprises the steps of preparing a mold for casting the body of the wear plate and the wear ring, and fixing the wear-resistant member in the inner space of the mold; ,

Carbon {C}: 0.3% to 0.8%, manganese {Mn}: 8% to 12%, chromium {Cr}: 4% to 6%, nickel {Ni} in weight % in the mold to which the wear-resistant member is fixed: 4% to 8%, silicon {Si}: 2% to 4%, boron {B}: 0.3% to 0.5%, cerium {Ce}: 0.05% to 0.1%, magnesium {Mg}: 0.05% to 0.1%, Casting a body by injecting and solidifying a molten alloy made of iron and other unavoidable impurities;

a heat treatment step of heating and quenching the cast body in a heating furnace;

It is characterized in that it comprises the steps of manufacturing the finished product by roughing and finishing machining the heat-treated body.

In the step of casting the body, the injection of molten metal is carried out at 1450 ° C to 1550 ° C,

The heat treatment step is characterized in that water quenching after heating to 1050 ~ 1100 ℃ in a heating furnace,

The mold is a self-hardening mold,

The wear-resistant member is at least one selected from among SiC, TiC, WC, CBN, Si3N4, and waste carbide tip, and is inserted and fixed in the self-hardening mold.

Here, the reason for fixing the wear-resistant member to the internal space of the self-hardening mold is that the wear-resistant member is a leaf-shaped or square-shaped small object made of SiC, TiC, WC, and waste carbide tools. If molten iron is poured without heating, it will be swept away by the molten iron or flow to another place. Therefore, it is necessary to fix it at a predetermined position in the mold space and pour molten iron.

The reason that the molten metal is injected at 1450°C to 1550°C in the casting stage is because this temperature is the most suitable injection temperature. If it is lower than that, the molten iron rapidly hardens, resulting in misrun defects.

The reason for water quenching after heating to 1050~1100℃ in a heating furnace is the water quenching characteristic temperature of the high manganese steel material. After this heat treatment, the hardness is about HB200-230, but when an impact or processing energy is applied, the austenite structure changes to a martensite structure, and the hardness increases to HB500-600. to be.

<Example>

First, in order to prepare the alloy material as shown in Table 1 below, the calculated scrap iron and alloy iron are charged into a high-frequency electric induction furnace and melted with electric energy.

C Si Mn Cr Ni B Ce Al Co Mg Example 1 0.5 3.8 10.0 5.5 5.0 0.4 0.1 0.2 - 0.01 Example 2 0.6 3.9 10.5 5.3 5.0 0.3 0.1 0.21 - 0.02 Example 3 0.7 4.0 10.4 5.4 5.1 0.2 0.1 0.2 - 0.02 Example 4 0.8 3.9 10.3 5.2 4.9 0.2 0.1 0.18 - 0.01 Comparative Example 1 0.2 2.0 8.0 5.0 4.0 - - 0.15 - - Comparative Example 2 Hadfield Steel 1.2 1.0 14.0 2.0 0.1 - - - - - Comparative Example 315Cr3Mo 3.0 0.6 0.4 16 0.1 - - - Mo; 3.0 - Comparative Example 4Nitronic60 0.1 4.0 8.0 16.0 7.0 - - N; 0.15 Mo;0.02 Cu;0.05 Comparative Example 5Stellite6 1.0 - 1.2 30 - - - W;4.5 Co;63 -

Chemical composition of wear-resistant alloy material {wt%}

Next, a mold for casting the wear plate and the wear ring is prepared, and the wear-resistant member, which is a hard material, is fixed in a mold made of silica sand (Sand Mold), and a paint is applied with a brush or sprayed.

After that, preheat the mold with a gas torch and dry the moisture before putting it together.

At this time, the mold should use a self-hardening mold. It is best to use the CO2 process, which is produced by using sodium silicate as a binder for silica sand, which is an inorganic self-hardening mold, and CO2 gas as a curing gas. Furan, an organic self-hardening process You may use a mold made by Process or Pepset Process or Shell Process using Resin Coated Sand.

The casting operation is completed by injecting alloy steel composed mainly of manganese, chromium, and nickel with excellent wear resistance melted in the high-frequency induction furnace into the mold produced in this way,

After that, after removing the sprue system, etc., and performing a shot blasting treatment, the temperature is raised to 1,050°C in a heat treatment furnace, maintained for 2 hours, water quenched heat treatment, and then the entire surface is roughed to produce a finished product.

Table 2 shows the test results for the chemical composition and physical properties of the alloy steel containing manganese-chromium-nickel having excellent wear resistance and excellent impact strength of the present invention as a main component.

Tensile strength {kg/mm2} elongation {%} Hardness {HRC} Abrasion comparison {mg/1000 times} note Example 1 125 14.2 52 2.55 After work hardening Example 2 132 12.6 55 2.48 After work hardening Example 3 140 11.8 57 2.45 After work hardening Example 4 165 8.5 62 2.21 After work hardening Comparative Example 1 150 4.0 54 3.18 After work hardening Comparative Example 2 120 6.0 52 6.24 After work hardening Comparative Example 3 - 0.3 65.3 1.09 after heat treatment Comparative Example 4 73.5 30 HRB95 4.01 after heat treatment Comparative Example 5 73.8 1.2 45.8 2.23 after heat treatment

Comparison of physical properties by wear-resistant alloy material

As shown in Table 2, although Examples 1 to 4, which are alloy steels of the present invention, are the cheapest materials, mechanical properties such as tensile strength, elongation, hardness, etc. It has been shown to be comparable to Stellite steel.

Comparative Material 2 is a high manganese steel {trade name: Hadfield Steel} and is an abrasion-resistant steel used as a tooth plate of Kryasha.

Comparative Material 3 is High Chromium White Cast Iron and has the best wear resistance among cast iron materials. However, the elongation of this material is close to zero and the brittleness is very strong, so it cannot be used for parts requiring impact strength.

Comparative Material 4 is a patented wear-resisting material, has excellent high-temperature abrasion resistance and very high impact strength. Low hardness and low wear resistance.

Comparative material 5 is the brand name of the famous wear-resistant steel called Stelite6, and it has excellent high-temperature abrasion resistance. It is a super alloy used as a welding material for the existing cemented carbide insert wear plate and wear ring.

Claims (6)

In the wear plate and wear ring used for a concrete pump car, The body of the wear plate and the wear ring is a cast product, and the composition is C: 0.3% to 0.8%, Mn: 8% to 12%, Cr: 4 by weight. %~6%, Ni: 4%~8%, Si: 2%~4%, B: 0.3%~0.5%, Ce: 0.05%~0.1%, Mg: 0.05%~0.1%, remainder: other unavoidable impurities A wear plate and a wear ring used in a concrete pump car, characterized in that it is made of an alloy of iron and iron, and a wear-resistant member is uniformly inserted into the surface of the body. According to claim 1, The wear-resistant member is one or more selected from SiC, TiC, WC, CBN, Si3N4, and waste carbide tip, the shape of which is circular or prismatic, the size of which is 10 to 20 mm in width and length, Wear plates and wear rings used in concrete pump cars, characterized in that the thickness is 2 to 6 mm The wear plate and wear ring used in a concrete pump car according to claim 1 or 2, wherein the wear-resistant member inserted into the surface of the body is inserted and welded at a distribution rate of 30 to 60% per area. A method of manufacturing a wear plate and a wear ring used in a concrete pump car, the method comprising: preparing a mold for casting the body of the wear plate and the wear ring; and fixing a wear-resistant member in an internal space of the mold; C: 0.3%~0.8%, Mn: 8%~12%, Cr: 4%~6%, Ni: 4%~8%, Si: 2%~4%, B: 0.3% to 0.5%, Ce: 0.05% to 0.1%, Mg: 0.05% to 0.1%, remainder: casting a body by pouring and solidifying an alloy molten metal consisting of other unavoidable impurities and iron, and the cast body A method of manufacturing a wear plate and a wear ring used in a concrete pump car, characterized in that it consists of a heat treatment step of heating and rapid cooling in a heating furnace, and manufacturing a finished product by roughing and finishing machining the heat-treated body According to claim 4, In the step of casting the body, the injection of the molten metal is carried out at 1450 ℃ ~ 1550 ℃, The heat treatment step is concrete characterized in that the water quenching after heating to 1050 ~ 1100 ℃ in a heating furnace Manufacturing method of wear plate and wear ring used in pump car The self-hardening mold according to claim 4 or 5, wherein the mold is a self-hardening mold, and the wear-resistant member is at least one selected from among SiC, TiC, WC, CBN, Si3N4, and waste carbide tip. Manufacturing method of wear plate and wear ring used in concrete pump car, characterized in that it is inserted and fixed

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