CN116377317A - As-cast austenite high-manganese wear-resistant steel and preparation method and application of product thereof - Google Patents
As-cast austenite high-manganese wear-resistant steel and preparation method and application of product thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/22—Lining for containers
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to as-cast austenite high-manganese wear-resistant steel, which comprises the following alloy elements in percentage by mass: c:0.7-1.3%, si:0.3-0.7%, mn:7.0-20.0%, al:0.03-0.4%, cr:0.2-1.0%, mo:0.1-0.6%, ni:2.0-7.0%, V:0.05-0.6%, N:0.01-0.04%; p: less than or equal to 0.04 percent; s: less than or equal to 0.02 percent, and the balance of iron and unavoidable impurities. According to the invention, the element proportion of C, mn, ni, cr is reasonably proportioned, and Mo, V, nb, N, re is used for alloying treatment, so that the steel obtains reliable as-cast austenite, fine nucleation carbides such as Mo, V, nb, N, re are densely distributed in an alloyed material crystal packet to refine grains, and precipitation of grain boundary carbides can be obviously reduced, so that the mechanical property is improved; and due to grain refinement and existence of fine carbide hard particles, the stacking fault energy in the process of work hardening can be effectively reduced, so that the work hardening capacity is improved, and the wear resistance of the product is increased.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to an as-cast austenitic high-manganese wear-resistant steel and a preparation method and application of a product thereof.
Background
The high manganese steel is taken as a special wear-resistant steel, the patent of the high manganese steel is firstly obtained by the English Hardfield (R0.A0.Hadfield) in 1883, the representative steel grade is ZG120Mn13 (C: 1.05-1.35%, si:0.3-0.9%, mn:11-14%, P: less than or equal to 0.06%, S: less than or equal to 0.04% and a small amount of V, ti, nb, B elements, RE elements and the like are allowed to be added), the high manganese steel has been known for more than 100 years, and is a steel grade with higher carbon content and manganese content, the superficial surface of the steel grade is deformed to induce twin crystal strengthening and dislocation, the surface hardness and strength are sharply improved, and the work hardening phenomenon is only existed on the surface of the steel grade, the matrix below the surface of the steel grade is still austenite, so the high hardness wear-resistant steel is applied to the heavy load equipment such as a crusher, the high hardness wear-resistant steel with excellent toughness and plasticity, and the wear-resistant steel grade is still the most consumed in mining, crushing, transportation and other areas such as mines.
Along with the development of material science, people have increasingly clear knowledge of the existing high manganese steel, and the high manganese steel needs to be subjected to water toughening treatment after being heated to over 1050 ℃ in the actual processing process, so that the use requirement can be met after the matrix is austenitized. The water toughening treatment is a solution treatment process, and the as-cast structure of the high manganese steel is composed of austenite, carbide and a small amount of pearlite. Carbides precipitated along the austenite grain boundaries reduce the toughness of the steel, and to eliminate carbides, the steel is heated to an austenite region temperature (1050-1100 ℃) and held for a period of time (1 h for every 25mm wall thickness) so that the carbides in the as-cast structure are substantially all solid-dissolved into austenite, and then rapidly water-cooled (so-called water-toughening treatment), thereby obtaining a single supercooled austenite structure. For example, thin and long workpieces such as conveyor plates on mine conveyors in large mines, up to about 3m in length. The conveying plates are assembled and used for chain ring strings, so that the requirement on the dimensional accuracy of each conveying plate is relatively high.
However, thin and long high manganese steel workpieces such as conveying plates have a number of disadvantages in practical production: (1) Irregular deformation in water toughening treatment is difficult to control, and shaping treatment is difficult to carry out after distortion deformation. After the high-manganese wear-resistant steel conveying plate produced by the conventional process is subjected to water toughening treatment and shot blasting cleaning, the flatness of the product is often failed, the surface in the length direction and the surface in the plane deform in both directions, the drawing requirements can be met only by repeated shaping, and even part of the product cannot be just scrapped after serious distortion. (2) It is difficult to use in the manufacture of high manganese steel and ZTA ceramic composites, such as high manganese steel and ZTA ceramic composite board hammers. The plate hammer is one of the important parts when the impact crusher processes materials, high manganese steel or ultra-high manganese steel is often adopted as a matrix material of a large wear-resistant part, and hard ZTA ceramic particles are compositely embedded in a working position. As the high manganese steel produced by the conventional water toughening heat treatment process is subjected to water toughening treatment at 1050-1100 ℃, the high manganese steel matrix embedded with ZTA ceramic expands and contracts due to the blocking factor during heat treatment, and the ZTA ceramic is cracked after being subjected to rapid temperature change of the water toughening treatment, so that the high manganese steel composite ZTA ceramic process is difficult to practice. (3) the high manganese steel has poor wear resistance in many occasions. From the two aspects of production difficulty and material characteristics, the austenitic high manganese steel treated by water toughness belongs to a stable austenitic material, and the component design range is positioned inIn the austenitic region of the Fe-C-Mn structure diagram, under the condition of impact abrasive wear, the strengthening mechanism of austenite is as follows: a→dislocation, twinning→epsilon-m→alpha' -M. Due to most impact conditions<3.0J/cm 2 Impact load belongs to the category of medium and low impact values, and the impact energy cannot completely meet the physical equivalent of alpha' -M phase change, so that the wear resistance of products such as conveying plates for ore material transportation and the like is not ideal. For example, the non-strong impact parts such as a ball mill lining plate, a crushing surface guard plate and the like manufactured by the traditional austenitic high manganese steel have short durability time and high resource consumption.
In view of the foregoing, there is a need for improved methods in the art.
Disclosure of Invention
First, the technical problem to be solved
In view of the above-mentioned shortcomings and disadvantages of the prior art, the present invention provides an as-cast austenitic high manganese wear-resistant steel and a method for producing the same, wherein the as-cast austenitic high manganese wear-resistant steel has mechanical properties (tensile strength and impact strength) equivalent to those of austenitic high manganese steel and wear-resistant properties superior to those of austenitic high manganese steel, and the water toughness treatment is not required in the process of processing into products, so that not only can heat treatment energy consumption and material oxidation burning loss be saved, but also the workload of shaping procedures is greatly reduced, the production period of the products is shortened, and the technical problems of difficult-to-control distortion deformation caused by the water toughness treatment and low product yield caused by the distortion are avoided.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
in a first aspect, the invention provides an as-cast austenitic high-manganese wear-resistant steel, which comprises the following alloy elements in percentage by mass: c:0.7-1.3%, si:0.3-0.7%, mn:7.0-20.0%, al:0.03-0.4%, cr:0.2-1.0%, mo:0.1-0.6%, ni:2.0-7.0%, V:0.05-0.6%, N:0.01-0.04%; p: less than or equal to 0.04 percent; s: less than or equal to 0.02 percent, and the balance of iron and unavoidable impurities.
Preferably, the C content is 1.3% or more and C is 0.8% or more, more preferably 1.2% or more and C is 0.9% or more.
Preferably, the Si content is 0.7% or more and Si is 0.5% or more, more preferably 0.65% or more and Si is 0.55% or more.
Preferably, the Mn content is: 17.0% or more Mn 9% or more, more preferably 15% or more Mn 10% or more.
Preferably, the Ni content is 5% or more and 3% or more of Ni, more preferably 4.2% or more and 3.20% or more of Ni.
Preferably, the Cr content is 0.9% or more and Cr is 0.3% or more, more preferably 0.75% or more and Cr is 0.35% or more.
Preferably, the Mo content is 0.50 percent or more and Mo is 0.20 percent or more, more preferably 0.40 percent or more and Mo is 0.30 percent or more.
Preferably, the V content is 0.40% or more and V is 0.10% or more, more preferably 0.35% or more and V is 0.15% or more.
Preferably, the N content is 0.03% or more and N is 0.02% or more, more preferably 0.025% or more and N is 0.020% or more.
Preferably, P: less than or equal to 0.035 percent; s: less than or equal to 0.015 percent; the lower the P and S content, the better in the case where the technology is achievable.
Preferably, the Al content is 0.20% or more and Al is 0.05% or more, more preferably 0.10% or more and Al is 0.05% or more.
According to a preferred embodiment of the invention, the wear resistant steel further comprises 0.01-0.15% of Nb and/or 0.03-0.3% of Re. On the premise of meeting the use requirement of specific occasions, nb or Re elements can not be added into the wear-resistant steel alloy elements so as to reduce the product cost; for the application occasions with higher requirements on the product performance, the mechanical performance and the wear resistance of the product can be further improved by adding Nb or Re elements.
Preferably, the Nb content is 0.15% or more and Nb is 0.05% or more, more preferably 0.10% or more and Nb is 0.06% or more. Preferably, the Re content is 0.25% or more and Re is 0.05% or more, more preferably 0.10% or more and Re is 0.05% or more.
Wherein Al and Re are deoxidizing and degassing elements, and the ReSiCa alloy and aluminum can be adopted to jointly deoxidize the wear-resistant steel in actual production.
In the as-cast austenite high-manganese wear-resistant steel, the wear-resistant steel is enabled to obtain reliable as-cast austenite through reasonable proportion of C, si, mn, ni, cr elements, and Mo, V, nb, N, re is used for alloying treatment, so that high-melting-point fine nucleation carbides such as Mo, V, nb, N, re are dispersed and distributed in the wear-resistant steel, and the as-cast austenite high-manganese wear-resistant steel provides polycrystalline nucleus crystallization conditions for early crystallization of molten steel, further refines grains, can obviously reduce the generation of grain boundary carbides, and further improves mechanical properties such as tensile strength, impact value and the like; and due to grain refinement and existence of fine carbide hard particles, the stacking fault energy in the process of work hardening can be effectively reduced, so that the work hardening capacity is improved, and the wear resistance of the product is increased.
Wherein Ni is a strong austenite stabilizing element, and the content of the Ni element is increased, so that the mechanical properties (such as tensile strength, impact value and the like) of the wear-resistant steel are stabilized. Cr, mo, V, nb, N is an alloying element (for carbide, nitride, etc.) for improving the wear resistance of the wear resistant steel. Wherein Re and Al are deoxidizing and degassing agents.
When the content of Cr, mo, ni, V, nb, re and the like is too high, the product cost is remarkably increased, and the excessive element content conversely causes the mechanical properties of the wear-resistant steel to be reduced. Also, when the content of Cr, mo, ni, V and the like is too low, the mechanical properties of the wear-resistant steel product cannot be expected. Accordingly, the present invention limits their content to the aforementioned range.
In a second aspect, the present invention provides a method of making an as-cast austenitic high manganese wear resistant steel article comprising: adding raw materials according to the alloy element components, smelting to 1500-1600 ℃, discharging from a furnace, blowing argon into a bag for 3-8 minutes, pouring the bag into a product mould at 1400-1500 ℃, demoulding to obtain an as-cast blank, and cleaning, polishing or cleaning, polishing and machining the blank in a combined way to obtain the as-cast austenitic high-manganese wear-resistant steel product.
Preferably, the cleaning and polishing comprises cutting and casting, riser cleaning and shot blasting.
Preferably, the machining includes machining methods such as turning, milling, planing, drilling, water jet cutting and the like.
Preferably, the smelting temperature is 1520-1560 ℃ and the casting temperature is 1420-1460 ℃.
Preferably, the as-cast austenitic high manganese wear resistant steel product is a thin, long wear resistant work piece.
Preferably, the cast austenite high manganese wear-resistant steel product is a wear-resistant workpiece such as a conveying plate on an ore conveyor, a crusher composite ceramic plate hammer, a crusher guard plate, a ball mill lining plate, a grinding roller of a Raymond mill, a grinding ring and the like in a large mine.
In a third aspect, the invention provides an application of as-cast austenitic high-manganese wear-resistant steel in preparing a light and thin long wear-resistant workpiece.
In a fourth aspect, the invention provides an application of as-cast austenite high manganese wear-resistant steel in preparing a conveying plate on an ore conveyor, a composite ceramic plate hammer of a crusher, a hammer head of the crusher, a guard plate of the crusher, a lining plate of a ball mill, a grinding roller or a grinding ring of a Raymond mill.
(III) beneficial effects
The invention provides an as-cast austenite high manganese wear-resistant steel which has mechanical properties equivalent to those of austenite high manganese steel and wear resistance superior to those of austenite high manganese steel, wherein the as-cast austenite high manganese wear-resistant steel is obtained by reasonably proportioning C, mn, ni, cr element proportion and alloying Mo, V, N, nb, re (such as Nb and Re) elements, and fine nucleation carbides such as Mo, V, nb, N, re are densely distributed in an alloyed material crystal package to refine crystal grains, and the precipitation of crystal boundary carbides can be obviously reduced so as to improve the mechanical properties; and due to grain refinement and the existence of fine carbide hard particles, the fault energy in the process of work hardening can be reduced, so that the work hardening capacity is improved, and the wear resistance of the as-cast austenite high-manganese wear-resistant steel product is improved.
The as-cast austenite high manganese wear-resistant steel can be classified into a metastable austenite new material, high-hardness particles such as carbide, nitride, oxide and the like are densely distributed in a crystal packet of the material, the high-hardness particles are wear-resistant phases, and the high-hardness particles prevent dislocation, so that the phase change impact energy is reduced, and favorable conditions are provided for work hardening.
Compared with the existing austenitic high manganese steel, the as-cast austenitic high manganese wear-resistant steel provided by the invention has the following technical advantages:
firstly, the water-toughening heat treatment is not needed in the product processing process, so that metal burning loss, deformation and heating energy consumption in the water-toughening heat treatment process are reduced, the influence of the water-toughening heat treatment deformation on light, thin and special structural products similar to conveying plates and the like can be avoided, and the production precision and the assembly precision of the products are improved; because the problem of water-tough heat treatment deformation is avoided, the shaping workload can be greatly reduced, the qualification rate of light, thin and special structural products is improved, the production period is shortened, and the production efficiency is improved; the casting production period is reduced by at least 5 days, and the product percent of pass is improved to more than 98 percent from about 93 percent. In addition, when the cast austenite high manganese wear-resistant steel is used for producing ZTA ceramic composite products (such as plate hammers and the like), the problems of cracking of the products, fragmentation of embedded ZTA ceramic and the like can be prevented because water-tough heat treatment is not needed, and the problem that the existing high manganese steel composite ceramic ZTA ceramic process is difficult to practice is solved.
Secondly, the wear-resisting performance of the high manganese steel product is superior to that of a common high manganese steel product. Through tests, the as-cast Brinell hardness of the as-cast austenitic high-manganese wear-resistant steel is more than or equal to 220HB, and the tensile strength is as follows: not less than 713Mpa, elongation: 24% or more, impact strength Aku: not less than 91.3J; the hardness is equivalent to that of the Mn18Cr2 high manganese steel treated by conventional water toughening; and the Brinell hardness, tensile strength and impact strength of the wear-resistant workpiece are far superior to the performance parameters of the wear-resistant workpiece (the performance index of the wear-resistant workpiece is that the hardness is HB140-240, the tensile strength is more than or equal to 650Mpa, the elongation is more than or equal to 20%, and the impact strength AKu is more than or equal to 90J)
Comparative wear test (relative wear resistance=impact wear time/weight difference of samples before and after test) was performed on an MLD-10 dynamic abrasive wear tester with conventional water-tough treated Mn18Cr2 high manganese steel, with an impact energy of 1.0Jcm 2 The impact times are 100 times/min, the grinding materials are 10-12 meshes of broken quartz sand, the abrasion test is carried out for 30min, and the relative abrasion resistance is more than 1.85 times of that of the comparison group. The service life of the ball mill lining board produced by adopting the as-cast austenite high-manganese wear-resistant steel is prolonged by more than 18 months, and the service life of the ball mill lining board is prolonged by more than half a year compared with the service life of the prior Mn18Cr2 product, and the service life of the ball mill lining board is more than 1.5 times of that of the conventional Mn18Cr2 product.
Thirdly, the method is more suitable for producing vulnerable parts of mining equipment. Such as conveying plates on a large mine ore conveyor, composite ceramic plate hammers of a crusher, hammer heads of the crusher, protecting plates of the crusher, lining plates of a ball mill, grinding rings of a Raymond mill and the like. Because the equipment has high replacement rate of vulnerable parts, the consumption of accessories is large, and the production difficulty of the conventional process is also large. The as-cast austenite high-manganese wear-resistant steel has the advantages of better wear resistance, good safety, short production period, few production procedures and the like, so that the technical scheme of the invention can create considerable social benefits except for slightly increasing the material cost.
Drawings
FIG. 1 is a graph showing the comparison of the crystalline phases of the as-cast austenitic high manganese wear resistant steel of the present invention with Mn18Cr2 high manganese steel produced by conventional water-tough heat treatment under 200-fold and 500-fold electron microscope fields.
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.
Example 1
The embodiment provides as-cast austenite high manganese wear-resistant steel with mechanical properties equivalent to those of the austenite high manganese steel and wear resistance superior to those of the austenite high manganese steel, which comprises the following alloy elements in percentage by mass: c:1.15%, si:0.52%, mn:15.3%, al:0.05%, cr:0.33%, mo:0.17%, ni:2.9%, V:0.11%, N:0.02%, re:0.04%; p: less than or equal to 0.04 percent; s: less than or equal to 0.02 percent, and the balance of iron and unavoidable impurities. And (3) smelting the materials to 1550 ℃ by adopting an intermediate frequency furnace according to the ingredients, discharging, blowing argon into a bag for 5min, pouring at 1450 ℃ to obtain an as-cast blank, cutting, casting, cleaning a riser, and performing shot blasting and then testing.
Example 2
The embodiment provides as-cast austenite high manganese wear-resistant steel with mechanical properties equivalent to those of the austenite high manganese steel and wear resistance superior to those of the austenite high manganese steel, which comprises the following alloy elements in percentage by mass: c:0.99%, si:0.34%, mn:17.0%, al:0.35%, cr:0.72%, mo:0.45%, ni:6.4%, V:0.35%, nb:0.12%, N:0.037%; p: less than or equal to 0.04 percent; s: less than or equal to 0.02 percent, and the balance of iron and unavoidable impurities. And (3) smelting the materials according to the previous components by adopting an intermediate frequency furnace to 1580 ℃ for discharging, blowing argon into a bag for 5min, casting at 1430 ℃ to obtain an as-cast blank, cutting, casting a riser, cleaning, and performing shot blasting and then testing.
Mechanical properties of as-cast austenitic high manganese wear resistant steels of examples 1 and 2 were tested: the as-cast Brinell hardness is 220-240HB, and the tensile strength is as follows: not less than 713Mpa, elongation: 24% or more, impact strength Aku: not less than 91.3J (each of the above-mentioned items is an actual measurement value of the sample). The hardness is equivalent to that of the Mn18Cr2 high manganese steel treated by conventional water toughening; the hardness value, the tensile strength and the impact strength are far more than index values of performance parameters of wear-resistant workpieces such as conveying plates on a large-scale mine ore conveyor, crusher composite ceramic plate hammers, crusher guard plates, ball mill liners, raymond mill roller grinding rings and the like (the performance indexes of the wear-resistant workpieces are that the hardness is HB140-240, the tensile strength is more than or equal to 650Mpa, the elongation is more than or equal to 20%, and the impact strength AKu is more than or equal to 90J).
Comparative example 1
Comparative example 1 is a hydrothermally treated Mn18Cr2 high manganese steel, the alloy composition of which is: c:1.27%, si:0.53%, mn:18.1%, al:0.039%, cr 1.9%, ni 0.021%, cu 0.028%, mo:0.133%, P:0.039%, S:0.01%; the balance being iron and unavoidable impurities. And (3) smelting according to the ingredients, casting, performing water-toughening heat treatment, performing shot blasting cleaning, and testing.
The crystalline phases of the as-cast austenitic high manganese wear resistant steels of example 1, example 2 and the conventional water-tough Mn18Cr2 high manganese steel of comparative example 1 are compared under the same test conditions as in fig. 1. As shown in the figure, the high-hardness wear-resistant particles such as fine carbides, nitrides and oxides are densely distributed in the cast austenite high-manganese wear-resistant steel crystal, and austenite grain boundaries are clear and the grain boundaries are rare inclusions are visible under the 500-time visual field. Compared with comparative example 1, the austenitic high-manganese wear-resistant steel as cast state has fine austenite grain package, high-hardness wear-resistant particles (no inclusions of 5mm are seen from the upper and lower sides of the grade 3A according to GB/T13925-2010 nonmetallic inclusion, no inclusions of 5mm are seen) densely distributed in the austenite grain package, and the grain size of the austenitic high-manganese wear-resistant steel as cast state is about one time smaller than that of a standard Mn18Cr2 product of conventional water-toughened high-manganese steel.
Comparative wear test (relative abrasion resistance=impact abrasion time/weight difference of samples before and after test) with conventional water-tough Mn18Cr2 on MLD-10 dynamic abrasive wear tester, test impact energy of 1.0Jcm 2 The impact times are 100 times/min, the grinding material is crushed quartz sand with 10-12 meshes, and the abrasion test is carried out for 30min. The relative abrasion resistance of examples 1 and 2 was 1.85 and 2.11 times that of the comparative group, respectively.
Example 3
The embodiment is an application of cast austenite high manganese wear-resistant steel in preparing a conveying plate (2470 mm long plate) of a mineral aggregate conveyor, wherein the alloy elements comprise the following components in percentage by mass: c:0.90%, si:0.6%, mn:12.8%, al:0.045%, cr:0.26%, mo:0.20%, ni:3.27%, V:0.15%, nb:0.10%, N:0.025%, re:0.04%; p: less than or equal to 0.04 percent; s: less than or equal to 0.02 percent, and the balance of iron and unavoidable impurities. And (3) smelting the materials to 1550 ℃ by adopting an intermediate frequency furnace according to the ingredients, discharging, blowing argon into a bag for 5min, pouring the bag to a forming die of a conveying plate of a mineral aggregate conveyor at 1460 ℃, demolding to obtain an as-cast blank of the conveying plate, cutting off a casting head, cleaning, and after shot blasting, enabling the side surface of the conveying plate to be straight in the length direction, wherein only slight shaping is required in the plane direction, so that the assembly requirement is completely met.
On the contrary, if the Mn18Cr2 high manganese steel Shui Ren heat treatment is adopted to produce the conveying plate as a comparison, the Mn18Cr2 high manganese steel conveying plate has plane deformation, the side surface of the conveying plate is deformed in an arc shape in the length direction (concave arc deformation on one side and convex arc deformation on the other side), the side surface deformation of the 2470mm long plate exceeds 60mm, and the drawing and assembly precision requirements can be met only by repeated shaping.
Example 4
The embodiment is an application of as-cast austenite high-manganese wear-resistant steel in preparing a crusher composite ceramic plate hammer product, wherein the alloy elements comprise the following components in percentage by mass: c:1.25%, si:0.62%, mn:17.3%, al:0.042%, cr:0.85%, mo:0.25%, ni:4.55%, V:0.16%, N:0.020%, re:0.042%; p: less than or equal to 0.04 percent; s: is less than or equal to0.02%, the balance being iron and unavoidable impurities. And (3) smelting the materials according to the previous components by adopting an intermediate frequency furnace to 1560 ℃ for tapping, blowing argon into a bag for 3min, pouring the materials into a plate hammer forming die pre-filled with ceramic blocks at 1460 ℃, demoulding to obtain a high-manganese wear-resistant steel-ceramic composite plate hammer cast blank, and carrying out plane processing to obtain the cast austenitic high-manganese wear-resistant steel-ceramic composite plate hammer. Wherein the component of the ceramic ZTA ceramic block is 70% of Al 2 O 3 +30％ZrO 2 The granularity of the ceramic is 12 meshes, and the embedding quantity is 16 groups on each side. The product percent of pass of the process reaches 100 percent.
The conventional water toughening heat treatment process is used for producing the high manganese steel-ceramic composite board hammer, the water toughening heat treatment is carried out after 1080 ℃ heat preservation for several hours, in most cases, the ceramic is broken due to the fact that the ceramic is difficult to bear factors such as severe heat expansion and cold contraction, rapid temperature change of the water toughening treatment and the like, and the high manganese steel body is cracked due to uneven stress caused by adding of ceramic blocks in the heat treatment temperature rising process, so that the high manganese steel-ceramic composite process is difficult to realize.
On the contrary, when the as-cast austenite high-manganese wear-resistant steel is used for producing the crusher composite ceramic plate hammer product, the water-tough heat treatment process is not needed, so that the wear-resistant steel composite ceramic process is easy to realize, stress non-uniformity cracking is avoided, and the 100% product percent of pass is achieved on the premise that other process conditions are not problematic. Besides, the service life of the wear-resistant steel-ceramic composite board hammer produced by adopting the cast austenite high-manganese wear-resistant steel is more than 3 times of that of Mn3Cr 2.
Example 5
The embodiment is an application of cast austenite high manganese wear-resistant steel in preparing a ball mill lining plate for producing 2.1m, and the alloy elements of the cast austenite high manganese wear-resistant steel comprise the following components in percentage by mass: c:1.15%, si:0.65%, mn:13.7%, al:0.053%, cr:0.65%, mo:0.35%, ni:3.2%, V:0.18%, N:0.021%, re:0.035%; p: less than or equal to 0.04 percent; s: less than or equal to 0.02 percent, and the balance of iron and unavoidable impurities.
And (3) smelting the materials to 1520 ℃ by adopting an intermediate frequency furnace according to the ingredients, discharging, blowing argon in a bag for 4min, pouring at 1430 ℃, demoulding to obtain an as-cast blank of the ball mill lining plate, and carrying out planar processing such as cutting, casting, riser cleaning, shot blasting cleaning and the like to obtain the ball mill lining plate, wherein the product size and the design coincidence degree of the drawing reach more than 99.2%. The service life of the product is prolonged by more than half a year than that of the original Mn13Cr2 product, and the service time is 1.5 times of that of the original Mn13Cr2 product.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The as-cast austenite high-manganese wear-resistant steel is characterized by comprising the following alloy elements in percentage by mass: c:0.7-1.3%, si:0.3-0.7%, mn:7.0-20.0%, al:0.03-0.4%, cr:0.2-1.0%, mo:0.1-0.6%, ni:2.0-7.0%, V:0.05-0.6%, N:0.01-0.04%; p: less than or equal to 0.04 percent; s: less than or equal to 0.02 percent, and the balance of iron and unavoidable impurities.
2. The as-cast austenitic high-manganese wear-resistant steel according to claim 1, wherein the C content is 1.3% or more C0.8% or more, more preferably 1.2% or more C0.9% or more.
3. The as-cast austenitic high-manganese wear-resistant steel according to claim 1, wherein the Si content is 0.7% or more Si 0.5% or more, more preferably 0.65% or more Si 0.55% or more.
4. The as-cast austenitic high manganese wear resistant steel of claim 1, wherein the Mn content is: 17.0 percent or more and Mn or more than 9 percent; ni content is 5 percent or more and Ni is 3 percent or more; the Cr content is 0.9 percent or more and 0.3 percent or more; the Mo content is 0.5 percent or more and 0.20 percent or more.
5. The as-cast austenitic high-manganese wear-resistant steel according to claim 1, wherein the V content is 0.3% or more and 0.10% or more; the N content is 0.03 percent or more and the N content is 0.02 percent or more; the Al content is 0.20 percent or more and 0.05 percent or more.
6. The as-cast austenitic high manganese wear-resistant steel according to any of claims 1 to 5, further comprising 0.01 to 0.15% Nb and/or 0.03 to 0.3% Re.
7. A method of making an as-cast austenitic high manganese wear resistant steel product comprising: the alloy element component additive raw materials of the cast austenite high manganese wear-resistant steel according to any one of claims 1 to 6, smelting to 1500-1600 ℃, discharging, argon blowing in a bag for 3-8 minutes, pouring into a product mould at 1400-1500 ℃, demoulding to obtain an cast blank, and cleaning, polishing or cleaning, polishing and combined machining the blank to obtain the cast austenite high manganese wear-resistant steel product.
8. The method of claim 7, wherein the planar machining includes cutting, riser cleaning, and shot blasting; smelting temperature is 1520-1560 ℃ and casting temperature is 1420-1460 ℃; the machining includes at least one of turning, milling, planing, drilling, and water jet machining methods.
9. Use of an as-cast austenitic high manganese wear resistant steel according to any of claims 1-6 for the manufacture of a thin and long wear resistant work piece.
10. Use of an as-cast austenitic high manganese wear resistant steel according to any of claims 1-6 for the manufacture of conveyor plates on ore conveyors, crusher composite ceramic plate hammers, crusher shields, ball mill liners, grinding rolls or grinding rings of raymond mills.
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