KR100608098B1 - Hot wear-resistant materials and method of manufacturing the same and roller crusher having the same - Google Patents

Abstract

The present invention relates to a hot wear-resistant material and a method for producing the same, comprising a mixture of 0.1 to 1.0 parts by weight of C, 0.1 to 5.0 parts by weight of Cr, and 0.1 to 10 parts by weight of Nb, Co, W and V. Provided are hot abrasion resistant materials comprising iron alloyed iron and a number of heat treatment processes to produce hot abrasion resistant materials that can be used in the heat of a reduced melting furnace. As a result, it is possible to use for a long time even at high temperature, thereby achieving high lifespan, improving mechanical durability, maintaining thermal stability, and in particular, a roll crusher manufactured by using the above-described hot abrasion-resistant material in the hot zone of the crushed tooth. Abrasion characteristics can be improved, and impact resistance characteristics of the roll body can be improved.

Roll, crusher, wear resistance, durability, heat treatment, hardness

Description

Hot wear-resistant materials and method for manufacturing same and roll crusher comprising same {Hot wear-resistant materials and method of manufacturing the same and roller crusher having the same}

1 is a conceptual diagram of a roll crusher according to the present invention.

<Explanation of symbols for main parts of drawing>

100: roll body (100) 110: crushed value (110)

The present invention relates to a hot wear resistant material and a method for manufacturing the same, and to a hot wear resistant material having improved abrasion resistance so as to be usable in a reduced melting steelmaking furnace through material improvement and a roll crusher using the same.

Generally, a roll crusher has a pair of rolls rotating in opposite directions to each other, and a crushed value is formed on the surface of one roll. Thus, when the crushed object is supplied through the supply port while the pair of rolls having the crushed value are rotated, the crushed object is rolled into the roll having the crushed value and compressed and crushed.

The roll crusher used in the general smelting process (or steelmaking process) is operated in a temperature range of about 300 to 1000 degrees. This causes a problem that the fracture value of the roll surface is easily worn or damaged. It is assumed that the matrix around the carbide at high temperature deteriorates from martensite to ferrite, and is easily caused by subsequent hardening of iron ore.

Therefore, the roll crusher that is to be used annually of the reduced melting furnace has to maintain not only mechanical durability but also thermoelectric stability, and the crushed value 110 formed on the surface of the roll must have excellent impact resistance as well as wear resistance.

Therefore, the present invention is to change the material of the roll crusher to solve the above problems, by changing the manufacturing method of the mechanical durability is improved, it is possible to maintain thermal stability, excellent wear resistance and impact resistance within hot It is an object to provide a wear material and a method for producing the same.

A hot wear resistant material comprising a poly-alloy-based iron containing 0.1 to 1.0 parts by weight of C, 0.1 to 5.0 parts by weight of Cr, and a mixture of 0.1 to 10 parts by weight of Nb, Co, W and V. to provide. At this time, it is preferable that Cr, Nb, W, and Co combine with C to form carbide.

In addition, preparing a multi-alloy iron containing a mixture of 0.1 to 1.0 parts by weight of C, 0.1 to 5.0 parts by weight of Cr, and 0.1 to 10 parts by weight of Nb, Co, W and V according to the present invention and carbon It provides a method for producing a hot wear-resistant material comprising the step of performing a heat treatment process to be at least the A3 transformation point according to the components.

Here, the heat treatment process, performing a first heat treatment of annealing or normalizing for about 1 hour to 13 hours at a temperature of 700 to 1100 degrees, performing a second heat treatment by heating and cooling and 100 to 700 degrees Performing a third heat treatment to remove stress for about 1 to 4 hours under temperature, wherein the first heat treatment is performed at least once, and the inside and outside of the multi-alloy iron by the second heat treatment. It is preferable that the hardness difference of is 3-30 based on HRC.

In addition, in the roll crusher according to the present invention, a multi-alloy iron containing 0.1 to 1.0 parts by weight of C, 0.1 to 5.0 parts by weight of Cr, and a mixture of 0.1 to 10 parts by weight of Nb, Co, W, and V is mixed. Provided is a roll crusher comprising a wear resistant material comprising. At this time, it is preferable that Cr, Nb, W, and Co combine with C to form carbide.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like numbers refer to like elements in the figures.

The material is deformed or changed in shape by the sliding or high contact pressure between the materials during use. In the case of a metal material, the wear resistance may be improved by heat treatment, surface treatment, hard chromium plating, and the like. In the following embodiment will be described based on the use of the hot wear-resistant material of the present invention as the material of the roll crusher used between the hot.

1 is a conceptual diagram of a roll crusher according to the present invention.

Referring to FIG. 1, the roll crusher according to the present invention includes a pair of circular bodies 100a and 100b facing each other and a crushed tooth 110 formed on the surfaces of the bodies 100a and 100b, and the crushed tooth 110 ) Materials include C, Cr, Fe and mixed metals. At this time, the mixed metal includes Nb, Co, W and V.

The central axes of the circular roll bodies 100a and 100b are connected to an electric motor or a hydraulic motor, which is a rotation driving means (not shown). On the outer circumferential surfaces of the circular roll bodies 100a and 100b, the crushed teeth 110 protrude at equal angle intervals. Here, the crushed tooth 110 is mainly a tooth for crushing the teeth into the crushed raw material by the key effect. The wedge surface of the crushed tooth 110 forms an obtuse key angle. The chi angle is to be broken into the raw material by the key effect, and when the crushed tooth 110 is fixed to the body 100a, the top of the wedge surface forms a negative angle between the radial direction and the cutting edge angle. Therefore, when the crushed value 110 enters into the raw material at the key angle and crushes it, the crushed value 110 acts to crush at an acute angle than the external key angle. Here, the wedge surface is in contact with the raw material when mainly in the forward rotation (here referred to as the crushing direction), and is mainly crushed and crushed by the key effect (entering into the raw material). It is preferable that the back surface of the wedge surface has a chamfer formed at an angle of approximately 45 degrees with the wedge surface.

In order to fix the above-mentioned crushing teeth 110 to the outer circumferential surfaces of the circular roll bodies 100a and 100b, the circular roll bodies 100a and 100b may be formed with fixing holes crushed in the radial direction. The crushed tooth 110 is inserted into and fixed in the fixing holes of the bodies 100a and 100b and is made of an integral member, which is disposed outside the roll bodies 100a and 100b and may be formed to have a predetermined angle in the rotation direction. Of course, the present invention is not limited thereto, and the circular roll bodies 100a and 100b and the crushed teeth 110 may be simultaneously formed. When the bodies 100a and 100b and the crushed teeth 110 are integrally formed, the components constituting the bodies 100a and 100b and the crushed teeth 110 are composed of the same components. Of course, when the body (100a, 100b) and the crushed teeth 110 are manufactured separately from each other, the components may not be the same.

The above-described crushed value 110 is mainly composed of a mixture of 0.1 to 1.0 parts by weight of C, 0.1 to 5.0 parts by weight of Cr, and 0.1 to 10 parts by weight of Nb, Co, W and V in Fe. In this case, when the C content is added in the above range, the wear resistance of the crushed value 110 may be improved, but may be easily modified by heat. Within the above range, Cr may be added, and a mixed metal of Nb, Co, W, and V may be added to improve mechanical durability, increase hot hardness, and improve heat resistance characteristics. In addition, hot hardness may be increased by adding Nb-C, W-C, and V-C based on Cr-C. That is, Cr, Nb, W, Co and C combine to form a carbide.

In addition, in the present invention, a separate heat treatment process is performed in order to maintain excellent thermal stability even at the hardness and high temperature of the roll crusher including the crushed value 110.

First, crushed teeth 110 are produced on the multi-alloy iron roll bodies 100a and 100b including C, Cr, and Nb, Co, W, and V in Fe and its outer peripheral surface.

Subsequently, the first heat treatment is performed, but annealing or normalizing the roll bodies 100a and 100b having the crushed teeth 110 formed on the outer circumferential surface for about 1 to 13 hours at a temperature of 700 to 1100 degrees is performed. ). It is preferable to perform such annealing or normalizing once or several times.

Here, annealing is a type of heat treatment, which refers to an operation of heating at a high temperature so as to be in a thermally parallel state, and the material softens as it slowly cools down after heating. Such annealing removes distortion and the like, and facilitates machining. That is, the temperature is gradually raised to about 900 degrees, and then the lower bodies 100a and 100b having the shredded teeth 110 formed on the outer side are heated for a long time under this temperature, and then slowly cooled. The process time is preferably about 12 hours. Through such annealing, it is possible to produce a tissue having low hardness and high ductility, thereby improving toughness.

Normalizing is an operation in which steel is heated to austenite temperature to sufficiently austenite, and then slowly cooled in air to produce pearlite having a fine layer spacing. Due to the phase transformation caused by normalization, the crystal grains of ferrite and pearlite are made fine and maintained at high temperature, so that the distribution of alloying elements is uniform. As a result, it is possible to obtain an effect of increasing hardness, ductility, etc., and decreasing the difference in properties depending on the part or direction of the steel. This normalizing is particularly important as a heat treatment for carbon steels having about 0.5 to 0.9 parts by weight of carbon steel or steel which is used without plastic processing with casting. That is, the temperature is gradually increased to about 900 degrees, and then the lower bodies 100a and 100b having the shredded teeth 110 formed on the outer side are heated for a long time under this temperature, and then cooled by air cooling. However, the process time is preferably carried out about 1 hour per inch for sufficient stability. Through such normalization, the grain size can be refined to generate a standard tissue.

Next, secondary heat treatment is performed, but the crushed value heat treatment by rapid heating and quenching is performed. That is, by performing rapid heating quenching, it refers to a process of rapidly raising the temperature and then rapidly cooling. That is, the temperature of the roll bodies 100a and 100b in which the shredded teeth 110 are formed on the outer circumferential surface is rapidly raised to a temperature of about 600 to 1100 degrees, and then rapidly assumed to be at room temperature. By the secondary heat treatment, the crushed teeth 110 are hardened, and martensite structure is generated. Through the second heat treatment, the hardness of the bodies 100a and 100b and the crushed teeth 110 may be set. This hardness difference is preferably set to 3 to 30 HRC basis. Through this, the hardness of the crushed tooth 110 can be strengthened compared to the body.

Next, the third heat treatment is performed, but the stress relief heat treatment is performed for 1 to 4 hours at a temperature of 100 to 700 degrees. This eliminates thermal and tensile stresses and compressive stresses.

Next, the roll bodies 100a and 100b having the crushed teeth 110 formed on the outer circumferential surface are subjected to high temperature tempering for about 4 to 6 hours at a temperature of 550 to 750 degrees.

In this embodiment, heat treatment for annealing or normalizing stress removal was sequentially performed. However, the present invention is not limited thereto, and the heat treatment process may be variously changed to A3 transformation point according to the carbon component of the roll bodies 100a and 100b in which the crushed teeth 110 are formed on the outer circumferential surface. This is because the phase change is severe depending on the components of C and each A3 transformation point is different. That is, at least one of annealing, normalizing ring, crushed heat treatment, and tempering may be performed. In addition, after performing at least one of annealing and normalizing, the crushed value heat treatment and tempering may be performed. Of course, various other combinations are possible. In addition to the secondary heat treatment, reinforcing treatment such as flame heat treatment may be performed.

Through such a heat treatment process, the hardness difference between the internal material and the crushed material 110 may have a difference of at least 5 HRC.

Hereinafter, the specific examples will be described.

Table 1 is a graph showing the hardness value of the roll crusher according to the content of the alloying element described above.

Referring to the table, Example 1 is a ring body (100a, 100b) by using a multi-alloy iron is added 0.2 parts by weight of C, 2 parts by weight of Cr, 5 parts by weight of Nb, Co, W and V alloy After the crushed teeth 110 were prepared, the first and second tertiary heat treatments were sequentially performed. In Example 2, 0.5 parts by weight of C, 2 parts by weight of Cr, and 10 parts by weight of Nb, Co, W and V alloys are added. The ring bodies 100a and 100b and the crushed teeth 110 are made of alloy iron. After fabrication, the first, second and third heat treatments were performed sequentially. In Example 3, the ring bodies 100a and 100b and the crushed teeth 110 are made of multi-alloy iron, in which 0.9 parts by weight of C, 5 parts by weight of Cr, and 7 parts by weight of Nb, Co, W, and V alloys are added. After the preparation, the first, second and third heat treatments were performed sequentially.

Table 2 is a table showing the hot hardness of each material produced by the ratio of the Example and Comparative Example.

As shown in Table 2, the multi-alloy material according to Examples 1 to 3 exhibits a hardness of about 80.6 to 487 at a temperature of 400 to 800 degrees. In Comparative Example 2, although the hardness value of the hot rod showed high hardness, breakage caused by impact occurred during use, and Comparative Example 3 was used as a representative heat-resistant metal which is generally used, but the hot hardness at 400 degrees or higher than the developed product It can be seen that is low.

Thus, the roll crusher produced through the composition and heat treatment process according to the present invention can be used for a long time even at high temperature can achieve a high service life, it is possible to improve the mechanical durability. In addition, it is possible to maintain the thermal stability, to improve the hot wear resistance of the crushed teeth 110, and to improve the impact resistance characteristics of the roll body (100a, 100b).

As described above, the present invention is a hot wear-resistant material containing a multi-alloy iron containing C, Cr, and Nb, Co, W, and V, and by using a plurality of heat treatment processes, it can be used for a long time even at high temperature, resulting in high service life. It can achieve, and can improve the mechanical durability.

In addition, by using the hot wear-resistant material, it is possible to maintain the thermal stability by producing a roll crusher that can be used in the hot, to improve the hot wear resistance characteristics of the crushed teeth, it is possible to improve the impact resistance characteristics of the roll body.

Claims (7)

delete delete The body is cast by casting from 84 to 99.7 parts by weight of Fe, from 0.1 to 1.0 weight of C, from 0.1 to 5.0 parts of Cr and from 0.1 to 10 parts of Nb, Co, W and V in a mixture of multialloy based iron. Manufacturing step; And Performing a first heat treatment of annealing or normalizing for 1 hour to 13 hours in the temperature range of 700 to 1100 degrees Celsius (° C.); Performing a second heat treatment through rapid cooling to a room temperature and rapid heating to a temperature in the range of 600 to 1100 degrees Celsius; And Method for producing a hot wear-resistant material comprising the step of performing a third heat treatment for stress relief for 1 hour to 4 hours in the temperature range of 100 to 700 degrees (° C.). The method according to claim 3, The method of producing a hot wear-resistant material having a hardness difference between the inside and outside of the multi-alloy iron is 3 to 30 HRC. In a roll crusher containing a body and a crushed tooth formed on the surface of the body, The body by casting from 84 to 99.7 parts by weight of Fe, 0.1 to 1.0 parts by weight of C, 0.1 to 5.0 parts by weight of Cr, and a mixture of 0.1 to 10 parts by weight of Nb, Co, W and V. Alternatively, the crushed value is formed and subjected to a first heat treatment of annealing or normalizing for 1 hour to 13 hours in a temperature range of 700 to 1100 degrees (° C.), quenching to room temperature and 600 to 1100 degrees (° C.). Secondary heat treatment is carried out by rapid heating to a temperature of a range, and a heat-resistant material prepared by performing a third heat treatment for stress relief for 1 to 4 hours in the temperature range of 100 to 700 degrees (℃) Roll shredder, characterized in that. The method according to claim 5, The roll crusher of claim 1, wherein the Cr, Nb, Co, W, and Co are mixed with C to form a carbide material. delete

Images