CN111790756A - Chromium alloy section steel finished product roller and manufacturing method thereof - Google Patents
Chromium alloy section steel finished product roller and manufacturing method thereof Download PDFInfo
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- CN111790756A CN111790756A CN202010570183.6A CN202010570183A CN111790756A CN 111790756 A CN111790756 A CN 111790756A CN 202010570183 A CN202010570183 A CN 202010570183A CN 111790756 A CN111790756 A CN 111790756A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 89
- 239000010959 steel Substances 0.000 title claims abstract description 89
- 229910000599 Cr alloy Inorganic materials 0.000 title claims abstract description 34
- 239000000788 chromium alloy Substances 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 7
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 238000005496 tempering Methods 0.000 claims abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000000137 annealing Methods 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 239000011651 chromium Substances 0.000 claims abstract description 4
- 238000009792 diffusion process Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 239000010955 niobium Substances 0.000 claims abstract description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 241000254158 Lampyridae Species 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 3
- 230000001914 calming effect Effects 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000003607 modifier Substances 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- 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
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Geometry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a method for manufacturing a chromium alloy section steel finished product roller, which comprises the following specific steps: the roller is prepared from the following raw materials in parts by weight: 0.45-0.75% of carbon, 0.45-0.80% of silicon, 0.45-0.80% of manganese, 5.50-6.50% of chromium, 0.50-1.00% of nickel, 0.50-0.80% of vanadium and 0.15-0.30% of niobium; smelting pure molten steel, slagging by using a slagging agent, adding a modifier, and removing impurity elements by using active elements in rare earth to obtain pure molten steel; the top pouring process is adopted, when the molten steel is poured to the effective height of the upper roll neck, the height of the steel ladle is increased, and the downward flow impact force of the molten steel is increased; diffusion annealing, spheroidizing heating, normalizing heating and tempering. The chromium alloy section steel finished product roller and the manufacturing method thereof have the characteristics of high performance, greenness, environmental protection and conservation.
Description
Technical Field
The invention relates to the technical field of rollers, in particular to a chromium alloy section steel finished product roller and a manufacturing method thereof.
Background
In the rolling production process of the section steel, the specification, shape, size, precision and surface smoothness of a finished section steel product are always the key points of the control of the production process of the section steel, particularly the section steel with a complex section, the requirements are met, and the affected factors are many, such as rolling force, the material quality, rigidity, process design, rolling environment and the like of the section steel, and are in indispensable close connection with the comprehensive performance of a main rolling tool roller. At present, traditional rollers for rolling various types of section steel at home and abroad are made of more materials, but limited by rolling environment, the number of fine rollers which completely meet rolling requirements is small, and as steel products are produced in China to be strong, reduced green process equipment needs to be developed, industrial policies of reducing resource and energy consumption and reducing environmental pollution and carbon emission need to be created, and technological innovation needs to be provided, and high-performance, green, environment-friendly and saving new products need to be developed. Therefore, as a roller manufacturing enterprise for achieving the above object, it is necessary to develop an innovative way to improve efficiency, search market for science and technology, and continuously research and develop new products meeting the requirement of time difference so as to meet new requirements of section steel rolling enterprises.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the chromium alloy section steel finished product roller and the manufacturing method thereof are provided, and the obtained roller has the characteristics of high performance, greenness, environmental protection and conservation.
The technical scheme adopted by the invention for solving the technical problems is as follows: a chromium alloy section steel finished product roller is provided with two rollers which are distributed in an up-and-down symmetrical mode, the roller is provided with a roller body made of chromium alloy section steel, the left end and the right end of the roller body are respectively provided with a bearing installation part made of chromium alloy section steel, a fillet is arranged at the joint of the roller body and the bearing installation part, the outer side of the bearing installation part on the left side is provided with a connecting part made of chromium alloy section steel, and the outer side of the bearing installation part on the right side is provided with a transmission part made of chromium alloy section steel; evenly be provided with a plurality of arc annular along the length direction of roll body, the arc annular is cut open along upper and lower direction and is obtained the upper groove of undercut and the lower groove of upper groove, and the lower groove that is arranged in the top roll and the upper groove that is arranged in the roll of below are assembled and are formed a whole circle.
More specifically, in the above technical solution, the axis of the roll body, the axis of the arc-shaped ring groove, the axis of the bearing mounting portion, the axis of the connecting portion, and the axis of the transmission portion are located on the same straight line.
More specifically, in the above technical solution, the width of the arc-shaped ring groove occupies 0.07-0.09 of the length of the roller body.
More specifically, in the above technical solution, the roller body, the bearing mounting portion, the connecting portion, and the transmission portion are an integrated structure.
A manufacturing method of a chromium alloy section steel finished product roller comprises the following specific steps:
the first step is that the roller is prepared by the following raw materials by weight:
0.45 to 0.75% of carbon,
0.45 to 0.80 percent of silicon,
0.45 to 0.80 percent of manganese,
5.50 to 6.50 percent of chromium,
0.50 to 1.00 percent of nickel,
0.50 to 0.80 percent of vanadium,
0.15 to 0.30 percent of niobium;
smelting pure molten steel, adding alloy when the temperature of the steel reaches 1450-1500 ℃, slagging by using a slagging agent, adding 3-5 kg/ton of yttrium-based heavy rare earth molten steel alterant when the temperature of the steel reaches 1580-1620 ℃ after the steel is mixed by an electromagnetic stirrer, and removing impurity elements by using active elements in the rare earth to obtain the pure molten steel;
thirdly, adopting a top pouring process, pouring small flow when the lower roll neck in the casting cavity is poured to meet the requirement of sequential solidification, pouring large flow when the roll neck is filled with molten steel to a roll body, lifting the height of a molten steel ladle when the molten steel is poured to the effective height of the upper roll neck, increasing the downward flow impact force of the molten steel, sequentially feeding, simultaneously starting an electromagnetic vibrator, improving the density of molten steel cooling solidification crystals by utilizing vibration waves, refining microstructures, and eliminating a loose area formed when the roll is cooled and solidified;
step four, in a diffusion annealing stage, charging the roller at normal temperature, heating at the speed of 10-15 ℃/h, keeping the temperature for 6-8 h when the temperature is raised to 660-680 ℃ in a phase change stage, then heating at the speed of 15-20 ℃/h, and pulling out to 1050-1100 ℃ for air cooling on a trolley;
step five, spheroidizing temperature rise, namely, cooling the roller on a trolley to 450-550 ℃, then, performing furnace spheroidizing to convert carbide in the structure from a sheet shape to a fine particle shape, raising the temperature to a temperature slightly higher than an AC1 critical point at the temperature rise speed of 20-30 ℃/h, preserving the temperature for 15-30 h, and then, cooling the furnace;
a sixth step, in the normalizing temperature rise stage, when the roller temperature furnace is cooled to 500 ℃, the roller temperature furnace enters the furnace, the temperature is raised at the speed of 10-30 ℃ to 1000-1050 ℃, and then the roller is hung on a rotary spray quenching machine for water mist spray quenching;
and seventhly, tempering when the roller temperature is 250-300 ℃, keeping the temperature at 25 mm/h when the temperature is increased to 480-520 ℃ at the speed of 10-20 ℃/h, and then cooling in a furnace.
More specifically, in the above technical scheme, in the first step, the raw material of the roll further contains phosphorus of not more than 0.020%.
More specifically, in the above technical scheme, in the first step, the raw material of the roll further has sulfur of not more than 0.020%.
More specifically, in the above technical solution, in the second step, the slag former is prepared by mixing lime, firefly, carbon powder, silicon powder, and calcium carbide.
More specifically, in the technical scheme, in the second step, before tapping, 0.03-0.05% of aluminum cakes are inserted into the furnace for deoxidation, argon is blown in a ladle in a soft mode during tapping, micro slag floats upwards and is dehydrogenated, blowing is stopped after a few minutes, molten steel is calmed for 5-15 minutes, and the steel is poured when the temperature of the liquid phase is 50-80 ℃.
The invention has the beneficial effects that: the chromium alloy section steel finished product roller and the manufacturing method thereof provided by the invention have the advantages that the structural design is very reasonable, the roller has the characteristics of high performance, greenness, environmental protection and conservation, and the use requirements of steel rolling enterprises are met.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
The reference numbers in the figures are: 1. a roll body; 2. rounding off; 3. a bearing mounting portion; 4. a connecting portion; 5. a transmission section; 6. an arc-shaped ring groove; 6-1, arranging a groove; 6-2, lower groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "one side", "the other side", "both sides", "between", "middle", "upper", "lower", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the finished roll of chromium alloy section steel of the invention is provided with two rolls which are distributed in an up-down symmetrical manner, the roll is provided with a roll body 1 made of chromium alloy section steel, the left end and the right end of the roll body 1 are respectively provided with a bearing installation part 3 made of chromium alloy section steel, a fillet 2 is arranged at the joint of the roll body 1 and the bearing installation part 3, wherein the outer side of the bearing installation part 3 at the left side is provided with a connecting part 4 made of chromium alloy section steel, and the outer side of the bearing installation part 3 at the right side is provided with a transmission part 5 made of chromium alloy section steel; a plurality of arc-shaped ring grooves 6 are uniformly arranged along the length direction of the roller body 1, the arc-shaped ring grooves 6 are cut along the up-down direction to obtain an upper groove 6-1 of a downward concave and a lower groove 6-2 of an upper groove, and the lower groove 6-2 in the upper roller and the upper groove 6-1 in the lower roller are spliced to form a whole circle.
Wherein, the axis of the roller body 1, the axis of the arc-shaped ring groove 6, the axis of the bearing installation part 3, the axis of the connecting part 4 and the axis of the transmission part 5 are positioned on the same straight line. The width dimension of the arc-shaped ring groove 6 occupies 0.07-0.09 of the length dimension of the roller body 1, and the roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are of an integrated structure, namely, the roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are made of the same material, and the roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are of an integrated structure. The roller body 1, the bearing mounting part 3 and the connecting part 4 are all of a cylindrical structure. The transmission part 5 adopts a flat square transmission part.
The application of the patent aims at the characteristics of diversified, standardized, serialized, large-scale, high-rigidity and high-precision development of section steel products, and combines the national industrial policies, an improved chromium alloy section steel finished product roller is developed, the product has good wear resistance, strong impact toughness and strong hot cracking resistance, the rolling quantity of the roller on-machine operation is basically equivalent in the early and late stages, the rolling total quantity is improved by more than 5 times compared with that of the traditional roller, the improved chromium alloy section steel finished product roller is well received by rolling enterprises, and better economic benefit and social benefit are obtained.
The production method of the chromium alloy section steel finished roll comprises the following steps:
firstly, chemical components are reasonably prepared, and the roller is prepared from the following raw materials in parts by weight: 0.45-0.75% of carbon, 0.45-0.80% of silicon, 0.45-0.80% of manganese, less than or equal to 0.020% of phosphorus, less than or equal to 0.020% of sulfur, 5.50-6.50% of chromium, 0.50-1.00% of nickel, 0.50-0.80% of vanadium and 0.15-0.30% of niobium.
Secondly, smelting and pouring are carried out: 1. smelting pure molten steel, adding alloy when the temperature of the steel is 1450-1500 ℃, slagging after 20 minutes, mixing a slagging agent by lime, firefly, carbon powder, silicon powder and calcium carbide, mixing the materials by an electromagnetic mixer, adding 3-5 kg/ton of yttrium-based heavy rare earth molten steel modifier when the temperature of the steel is 1580-1620 ℃, removing impurity elements by using active elements in the rare earth to obtain pure molten steel, and inserting 0.03-0.05% of aluminum cakes into the furnace for deoxidation 5 minutes before tapping. Soft blowing argon in a steel ladle during tapping to enable micro slag to float upwards and remove hydrogen, stopping blowing after a plurality of minutes, calming molten steel for 5-15 minutes, and pouring when the temperature of the steel reaches 50-80 ℃; 2. pouring: the top pouring process is adopted, when the lower roll neck in the casting cavity is poured to meet the sequential solidification requirement, small flow is poured, when the roll neck is filled with molten steel to the roll body, large flow is poured, when the molten steel is poured to the effective height of the upper roll neck, the height of a molten steel ladle is increased, the downward flow impact force of the molten steel is increased, the flow is one third, sequential feeding is carried out, meanwhile, an electromagnetic vibrator is started, the density of the molten steel cooling solidification crystals is improved by utilizing vibration waves, the microstructure is refined, and a loose area formed when the roll is cooled and solidified is eliminated.
Thirdly, special heat treatment: 1. in the diffusion annealing stage, charging the roller at normal temperature, heating at the speed of 10-15 ℃/h, preserving heat for 6-8 hours when the temperature is raised to 660-680 ℃ in the phase change stage, then heating at the speed of 15-20 ℃/h, preserving heat according to the diameter of the roller of 25 mm/hour when the temperature of the roller is raised to 1050-1100 ℃, and then pulling out the roller to be cooled on a trolley; 2. in the spheroidization heating stage, the roller is cooled to 450-550 ℃ on a trolley and then enters a furnace for spheroidization, so that carbide in the structure is converted into fine particles from a sheet shape, corresponding structure preparation is prepared for subsequent roller quenching treatment, the heating speed is 20-30 ℃/h, the temperature is raised to a value slightly higher than the critical point of AC1, the temperature is kept for 15-30 h, and then the furnace is cooled; 3. in the normalizing temperature rise stage, when the roller temperature furnace is cooled to 500 ℃, the roller temperature furnace enters the furnace, the temperature is raised at the speed of 10-30 ℃ (the front section is 10-20 ℃, the rear section is 20-30 ℃), when the temperature is 1000-1050 ℃, the roller is kept at the temperature of 25 mm/h, and then the roller is hung on a rotary spray quenching machine for water mist spray quenching; 4. tempering: tempering when the roller temperature is 250-300 ℃, heating at the speed of 10-20 ℃/h, keeping the temperature when the temperature is 480-520 ℃, keeping the temperature at 25 mm/h, and then furnace cooling.
Fourthly, comprehensive performance of the roller: 1. the roll body hardness of the roll is 65-73 HSD, and the working layer hardness fall is less than or equal to 1.5 HSD; 2. the tensile strength of the roller is more than or equal to 600 Mpa; 3. the roller has a metallographic matrix structure, and metal type fine granular carbide, tempered sorbite, bainite and a small amount of martensite.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A chromium alloy shaped steel finished product roll is characterized in that: the roller is provided with two rollers which are distributed in an up-and-down symmetrical mode, the roller is provided with a roller body (1) made of chromium alloy steel, the left end and the right end of the roller body (1) are respectively provided with a bearing installation part (3) made of chromium alloy steel, a fillet (2) is arranged at the joint of the roller body (1) and the bearing installation part (3), the outer side of the bearing installation part (3) on the left side is provided with a connecting part (4) made of chromium alloy steel, and the outer side of the bearing installation part (3) on the right side is provided with a transmission part (5) made of chromium alloy steel; a plurality of arc-shaped ring grooves (6) are uniformly arranged in the length direction of the roller body (1), the arc-shaped ring grooves (6) are cut along the up-down direction to obtain an upper groove (6-1) which is sunken downwards and a lower groove (6-2) which is the upper groove, the lower groove (6-2) which is positioned in the upper roller and the upper groove (6-1) which is positioned in the lower roller are assembled to form a whole circle.
2. A chromium alloy section steel finished roll according to claim 1, characterized in that: the axis of the roller body (1), the axis of the arc-shaped ring groove (6), the axis of the bearing installation part (3), the axis of the connecting part (4) and the axis of the transmission part (5) are positioned on the same straight line.
3. A chromium alloy section steel finished roll according to claim 1, characterized in that: the width dimension of the arc-shaped ring groove (6) occupies 0.07-0.09 of the length dimension of the roller body (1).
4. A chromium alloy section steel finished roll according to claim 1, characterized in that: the roller body (1), the bearing installation part (3), the connecting part (4) and the transmission part (5) are of an integrated structure.
5. A method of manufacturing a chromium alloy steel finished roll according to claim 1, characterized in that: the specific process is as follows:
the first step is that the roller is prepared by the following raw materials by weight:
0.45 to 0.75% of carbon,
0.45 to 0.80 percent of silicon,
0.45 to 0.80 percent of manganese,
5.50 to 6.50 percent of chromium,
0.50 to 1.00 percent of nickel,
0.50 to 0.80 percent of vanadium,
0.15 to 0.30 percent of niobium;
smelting pure molten steel, adding alloy when the temperature of the steel reaches 1450-1500 ℃, slagging by using a slagging agent, adding 3-5 kg/ton of yttrium-based heavy rare earth molten steel alterant when the temperature of the steel reaches 1580-1620 ℃ after the steel is mixed by an electromagnetic stirrer, and removing impurity elements by using active elements in the rare earth to obtain the pure molten steel;
thirdly, adopting a top pouring process, pouring small flow when the lower roll neck in the casting cavity is poured to meet the requirement of sequential solidification, pouring large flow when the roll neck is filled with molten steel to a roll body, lifting the height of a molten steel ladle when the molten steel is poured to the effective height of the upper roll neck, increasing the downward flow impact force of the molten steel, sequentially feeding, simultaneously starting an electromagnetic vibrator, improving the density of molten steel cooling solidification crystals by utilizing vibration waves, refining microstructures, and eliminating a loose area formed when the roll is cooled and solidified;
step four, in a diffusion annealing stage, charging the roller at normal temperature, heating at the speed of 10-15 ℃/h, keeping the temperature for 6-8 h when the temperature is raised to 660-680 ℃ in a phase change stage, then heating at the speed of 15-20 ℃/h, and pulling out to 1050-1100 ℃ for air cooling on a trolley;
step five, spheroidizing temperature rise, namely, cooling the roller on a trolley to 450-550 ℃, then, performing furnace spheroidizing to convert carbide in the structure from a sheet shape to a fine particle shape, raising the temperature to a temperature slightly higher than an AC1 critical point at the temperature rise speed of 20-30 ℃/h, preserving the temperature for 15-30 h, and then, cooling the furnace;
a sixth step, in the normalizing temperature rise stage, when the roller temperature furnace is cooled to 500 ℃, the roller temperature furnace enters the furnace, the temperature is raised at the speed of 10-30 ℃ to 1000-1050 ℃, and then the roller is hung on a rotary spray quenching machine for water mist spray quenching;
and seventhly, tempering when the roller temperature is 250-300 ℃, keeping the temperature at 25 mm/h when the temperature is increased to 480-520 ℃ at the speed of 10-20 ℃/h, and then cooling in a furnace.
6. The manufacturing method of a chromium alloy section steel finished roll according to claim 5, characterized in that: in the first step, the raw material of the roller also contains phosphorus of less than or equal to 0.020%.
7. The manufacturing method of a chromium alloy section steel finished roll according to claim 5, characterized in that: in the first step, the raw material of the roller also has sulfur of less than or equal to 0.020%.
8. The manufacturing method of a chromium alloy section steel finished roll according to claim 5, characterized in that: in the second step, the slagging agent is prepared by mixing lime, firefly, carbon powder, silicon powder and calcium carbide.
9. The manufacturing method of a chromium alloy section steel finished roll according to claim 5, characterized in that: and in the second step, before tapping, inserting 0.03-0.05% aluminum cakes into the furnace for deoxidation, soft blowing argon gas into a steel ladle during tapping to enable micro slag to float upwards and remove hydrogen, stopping blowing after a plurality of minutes, calming molten steel for 5-15 minutes, and pouring when the steel is heated to the liquid phase temperature of 50-80 ℃.
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