CN111790757A - Chromium alloy large-scale section steel finishing roll and manufacturing method thereof - Google Patents
Chromium alloy large-scale section steel finishing roll and manufacturing method thereof Download PDFInfo
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- CN111790757A CN111790757A CN202010570386.5A CN202010570386A CN111790757A CN 111790757 A CN111790757 A CN 111790757A CN 202010570386 A CN202010570386 A CN 202010570386A CN 111790757 A CN111790757 A CN 111790757A
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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
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- 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
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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
- 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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- 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
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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
- 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
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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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- 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
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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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Abstract
The invention discloses a chromium alloy large-scale section steel finishing roll and a manufacturing method thereof, and the manufacturing method comprises the following steps: the roller is prepared from the following raw materials in parts by weight: 0.35-0.65% of carbon, 0.45-0.75% of silicon, 0.60-0.80% of manganese, 0.60-1.00% of nickel, 4.00-6.00% of chromium and 0.50-0.80% of vanadium; firstly adding furnace charge into a power frequency electric furnace, performing low-power current operation, rapidly heating the furnace charge with high power when the furnace charge enters a critical temperature, adding alloy into the furnace charge supplemented after the furnace charge is completely melted, sequentially slagging by using a slagging agent after several minutes, removing residual impurity elements and gas elements, activating other alloy elements by using active elements, and organically fusing; the pouring adopts a top pouring process; the roller adopts a hot box opening process. The prepared roller has the advantages of refined microstructure grains, high hardness, small fall, good wear resistance, excellent toughness and strength, strong hot cracking resistance and excellent surface quality of rolled materials.
Description
Technical Field
The invention relates to the technical field of finishing rolls, in particular to a chromium alloy large-scale section steel finishing roll and a manufacturing method thereof.
Background
The large-sized section steel finishing mill frame needs to ensure the size precision and the surface quality of a section steel and realize negative tolerance rolling, so that a finishing roll needs to have excellent wear resistance, higher yield strength and toughness and stronger hot cracking resistance.
At present, the large-scale section steel finishing roll in China mainly uses a nickel-chromium-molybdenum pearlite nodular cast iron wireless chilled cast iron roll, when channel steel, angle steel, I-shaped steel and mining U-shaped steel with specification are produced, a roll body is processed with a deeper hole pattern, and the hardness fall of the roll body is large, so that the single-groove rolling quantity of the roll is low, the groove changing operation and the roll changing operation are frequent, the roll consumption is increased, the operation rate of a rolling mill is low, and the surface quality of a rolled material is influenced. The high-carbon semi-steel roll and the high-carbon graphite steel roll are used in part of steel mills, the high-carbon semi-steel with the carbon content of more than 1.7 percent has 50-65 HSD hardness, the content of nickel-chromium-molybdenum alloy elements is increased, cast bainite appears on the roll body structure of the roll, and the roll shows good wear resistance, but the carbon and carbide content is more than 5 percent and sometimes exists in a block field or net shape, so that a certain loose area is formed in part of the roll area and the core part, the tensile strength of the roll is directly influenced, and even roll breakage accidents occur due to operation overload.
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 manufactured roll has the advantages of refined microstructure grains, high hardness, small fall, good wear resistance, excellent toughness and strength, strong hot cracking resistance and excellent surface quality of rolled materials.
The technical scheme adopted by the invention for solving the technical problems is as follows: a chromium alloy large-scale section steel finishing roll is provided with an upper roll made of chromium alloy large-scale section steel and a lower roll made of chromium alloy large-scale section steel, wherein a plurality of upper ring grooves are uniformly arranged along the length direction of a roll body of the upper roll, and the upper ring grooves are split along the up-down direction to obtain an upper triangular groove which is concave downwards and a lower triangular groove which is concave upwards; a plurality of lower ring blocks are uniformly arranged along the length direction of a roller body of the lower roller, and the lower ring blocks are split along the up-down direction to obtain an upper convex triangular bump and a lower convex triangular bump which protrude downwards; the upper triangular convex block in the lower roller is matched, meshed and embedded into the lower triangular groove of the upper roller.
More specifically, in the above technical solution, the upper roll further has bearing installation parts, connection parts, and transmission parts, the bearing installation parts are symmetrically disposed at the left and right ends of the roll body of the upper roll, the connection parts are disposed at the left side of the left bearing installation part, and the transmission parts are disposed at the right side of the right bearing installation part.
More specifically, in the above technical solution, the lower roll further has bearing installation parts, connection parts, and transmission parts, the bearing installation parts are symmetrically disposed at the left and right ends of the roll body of the lower roll, the connection parts are disposed at the left side of the left bearing installation part, and the transmission parts are disposed at the right side of the right bearing installation part.
A manufacturing method of a chromium alloy large-scale section steel finishing roll comprises the following specific manufacturing steps:
the first step is that the roller is prepared by the following raw materials by weight:
0.35 to 0.65% of carbon,
0.45 to 0.75 percent of silicon,
0.60 to 0.80 percent of manganese,
0.60 to 1.00 percent of nickel,
4.00 to 6.00 percent of chromium,
0.50-0.80% of vanadium;
secondly, adding furnace burden in a power frequency electric furnace, performing low-power current operation, when the furnace burden enters a critical temperature, rapidly raising the temperature at a high power, completely melting the furnace burden, adding alloy when the temperature of steel rises to 1430-1480 ℃, sequentially slagging by using a slagging agent after several minutes, wherein the addition amount of the slagging agent is 15-20 kg/ton of steel, the slagging agent added in the process reacts with impurity elements of phosphorus and sulfur and gas elements of hydrogen and oxygen to form dross, cleaning the dross after several minutes, and adding high-melting-point alloy when the temperature rises to 1550-1570 ℃ after the completion of cleaning; secondly, carrying out secondary slagging, wherein the addition amount of a slagging agent used in the secondary slagging process is 10-15 kg/ton of steel, removing slag after several minutes, then adding 3-5 kg/ton of steel yttrium based heavy rare earth molten steel modificator, removing residual impurity elements and gas elements, activating other alloy elements by using active elements, organically fusing, then heating to 1580-1620 ℃, adding 0.03-0.05% of aluminum into each ton of molten steel for deoxidation and tapping, blowing argon to float fine slag, and carrying out calming for 8-15 minutes for pouring;
thirdly, pouring by adopting a top pouring process, wherein the pouring temperature is the liquid phase temperature plus 20-30 ℃, the pouring speed is controlled according to the roll shape and the weight, an electromagnetic vibrator is started to vibrate after the pouring is finished, the frequency is 60-120 times/min, and a riser is covered with a heat insulating agent;
step four, the roller adopts a hot box opening process: the roller temperature is subjected to unpacking and furnace charging heat treatment at 550-650 ℃, heat preservation is carried out for 6-8 hours after diffusion annealing enters the furnace, then the roller temperature is 10-20 ℃/hour to 1050-1100 ℃, after heat preservation is carried out for 20-40 hours, furnace cooling is carried out on a trolley to 450-500 ℃, furnace spheroidizing is carried out, the temperature is raised for 20-30 hours, after the roller temperature is 780-850 ℃, heat preservation is carried out for 20-30 hours, then air cooling, normalizing and tempering are carried out: and (3) after air cooling to normal temperature, furnace normalizing, heating to the temperature of 10-15 ℃ per hour, preserving heat for several hours when the temperature is 660-680 ℃, heating to 980 ℃ at the speed of 15-30 ℃/hour, preserving heat for 20-40 hours, air cooling, cooling to 200-400 ℃, then furnace tempering, heating at the speed of 30-40 ℃/hour, preserving heat for 6-10 hours when the temperature is 550-600 ℃, then furnace cooling, and taking out from the furnace when the roll temperature is 200 +/-5 ℃ after the cooling speed is 30-50 ℃/hour.
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 scheme, in the first step, the raw material of the roller further has rhenium of more than or equal to 0.03%.
More specifically, in the above technical solution, in the second step, the slag former is prepared by mixing cullet, silicon-manganese particles, molding new sand, industrial alkali and fluorite.
More specifically, in the above technical solution, in the second step, the slagging agent for the second slagging is prepared by mixing calcium oxide, calcium carbide and the balance of industrial alkali.
The invention has the beneficial effects that: the roll manufactured by the method has the advantages of refined microstructure crystal grains, high hardness, small fall, good wear resistance, excellent toughness strength, strong hot cracking resistance, 8-fold increase of single-groove rolling quantity compared with the traditional roll, over 2500 tons of rolling material, excellent surface quality of the rolled material and better use efficiency and economic benefit.
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. an upper roller; 2. a lower roller; 3. a roll body; 4. an upper ring groove; 4-1, arranging a triangular groove; 4-2, lower triangular grooves; 5. a lower ring block; 5-1, arranging a triangular bump; 5-2, lower triangular bumps; 6. a bearing mounting portion; 7. a connecting portion; 8. a transmission section; 9. and (6) rounding off.
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 chromium alloy large-sized section steel finishing roll provided by the invention comprises an upper roll 1 made of chromium alloy large-sized section steel and a lower roll 2 made of chromium alloy large-sized section steel, wherein a plurality of upper ring grooves 4 are uniformly arranged along the length direction of a roll body 3 of the upper roll 1, and the upper ring grooves 4 are split along the up-down direction to obtain an upper triangular groove 4-1 which is concave downwards and a lower triangular groove 4-2 which is concave upwards; a plurality of lower ring blocks 5 are uniformly arranged along the length direction of the roller body 3 of the lower roller 2, and the lower ring blocks 5 are split along the up-down direction to obtain an upper convex triangular bump 5-1 protruding upwards and a lower convex triangular bump 5-2 protruding downwards; the upper triangular lug 5-1 in the lower roller 2 is matched, meshed and embedded into the lower triangular groove 4-2 of the upper roller 1.
The upper roll 1 further comprises bearing installation parts 6, connection parts 7 and transmission parts 8, wherein the bearing installation parts 6 are symmetrically arranged at the left end and the right end of the roll body 3 of the upper roll 1, the connection parts 7 are arranged at the left side of the left bearing installation part 6, and the transmission parts 8 are arranged at the right side of the right bearing installation part 6. The roller body 3, the bearing mounting part 6, the connecting part 7 and the transmission part 8 in the upper roller 1 are of an integrated structure. The joint of the roller body 1 and the bearing installation part 6 in the upper roller 1 is provided with a fillet 9. The axes of the roller body 1, the upper ring groove 4, the bearing mounting part 3, the connecting part 4 and the transmission part 5 in the upper roller 1 are positioned on the same straight line. The transmission part 8 is a flat square transmission part.
The lower roll 2 further has bearing mounting portions 6, connecting portions 7, and transmission portions 8, the bearing mounting portions 6 being symmetrically provided at both left and right ends of the roll body 3 of the lower roll 2, the connecting portions 7 being provided on the left side of the left bearing mounting portion 6, and the transmission portions 8 being provided on the right side of the right bearing mounting portion 6. The roller body 3, the bearing mounting part 6, the connecting part 7 and the transmission part 8 in the lower roller 2 are of an integrated structure. The joint of the roller body 1 and the bearing installation part 6 in the lower roller 2 is provided with a fillet 9. The axes of the roller body 1, the lower ring block 5, the bearing mounting part 3, the connecting part 4 and the transmission part 5 in the lower roller 2 are positioned on the same straight line. The transmission part 8 is a flat square transmission part.
The invention provides a chromium alloy large-scale section steel finishing roll, which has the advantages of refined microstructure crystal grains, high hardness, small fall, good wear resistance, excellent toughness strength, strong hot cracking resistance, 8-fold increase of single-groove rolling quantity compared with the traditional roll, over 2500 tons of rolling quantity, excellent surface quality of rolled materials and better use efficiency and economic benefit.
The manufacturing method of the chromium alloy large-scale section steel finishing roll comprises the following steps:
firstly, chemical components are innovatively and optimally configured, and a roller is prepared from the following raw materials in parts by weight: 0.35-0.65% of carbon, 0.45-0.75% of silicon, 0.60-0.80% of manganese, less than or equal to 0.020% of phosphorus, less than or equal to 0.020% of sulfur, 0.60-1.00% of nickel, 4.00-6.00% of chromium, 0.50-0.80% of vanadium and more than or equal to 0.03% of rhenium.
Secondly, innovating a smelting and pouring process: 1. adding 80% of furnace charge into a power frequency electric furnace, performing low-power current operation, when the furnace charge enters a critical temperature, rapidly raising the temperature at a high power, supplementing 20% of furnace charge after the furnace charge is completely melted, adding alloy when the temperature of steel rises to 1430-1480 ℃, sequentially slagging after 20 minutes, wherein a slagging agent is prepared by mixing 30% of cullet, 30% of silicon-manganese particles, 30% of modeling fresh sand, 7% of industrial alkali and 3% of fluorite, adding 15-20 kg/ton of steel, performing chemical reaction on the slagging agent, impurity elements of phosphorus and sulfur, gas elements of hydrogen and oxygen to form floating slag, cleaning after several minutes, adding high-melting-point alloy when the temperature rises to 1550-1570 ℃ after cleaning, performing secondary slagging, wherein the slagging agent is prepared by 55-65% of calcium oxide, 20-30% of calcium carbide, the balance of industrial alkali, adding 10-15 kg/ton of steel, cleaning after several minutes, and then adding 3-5 kg of rare earth alterant per ton of molten steel, removing residual impurity elements and gas elements, activating other alloy elements by using active elements, organically fusing, heating to 1580-1620 ℃, adding 0.03-0.05% of aluminum into per ton of molten steel for deoxidation and tapping, blowing argon to float fine slag, and calming for 8-15 minutes for pouring; 2. and the pouring adopts a top pouring process, the pouring temperature is 20-30 ℃ plus the liquid phase temperature, the pouring speed is controlled according to the roll shape and the weight, the electromagnetic vibrator is started to vibrate after the pouring is finished, the frequency is 60-120 times/min, and a riser is covered with a heat insulating agent.
Thirdly, special heat treatment: the roller adopts a hot box opening process: the roller temperature is subjected to unpacking and furnace charging heat treatment at 550-650 ℃, heat preservation is carried out for 6-8 hours after diffusion annealing enters the furnace, then the temperature is increased to 1050-1100 ℃ at 10-20 ℃/hour, after heat preservation is carried out for 20-40 hours, furnace cooling is carried out on a trolley to 450-500 ℃, furnace spheroidization is carried out, the temperature is raised to 20-30 ℃ for hours, furnace cooling is carried out for 20-30 hours after the temperature is raised to 780-850 ℃, the cooling speed is 30 ℃/hour, then air cooling, normalizing and tempering are carried out: and (3) after air cooling to normal temperature, furnace normalizing, heating to 10-15 ℃ per hour, preserving heat for 4 hours when the temperature is 660-680 ℃, heating to 980 ℃ at the speed of 15-30 ℃/hour, preserving heat for 20-40 hours, air cooling, cooling to 200-400 ℃, then furnace tempering, heating at the speed of 30-40 ℃/hour, preserving heat for 6-10 hours when the temperature is 550-600 ℃, then furnace cooling, and taking out from the furnace when the roll temperature is 200 +/-5 ℃ after the cooling speed is 30-50 ℃/hour.
Fourthly, the hardness of the roll surface of the roll is 65-75 HSD, and the hardness drop from the roll surface to the groove bottom of the hole pattern is less than or equal to 2 HSD. The tensile strength of the roller is more than or equal to 620 Mpa. And (3) roller metallographic matrix structure: metal type fine grained carbide + pearlite + bainite + 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 large-scale section steel finishing roll is characterized in that: the chromium alloy rolling mill is provided with an upper roller (1) made of chromium alloy large-scale section steel and a lower roller (2) made of chromium alloy large-scale section steel, a plurality of upper ring grooves (4) are uniformly arranged along the length direction of a roller body (3) of the upper roller (1), and the upper ring grooves (4) are split along the up-down direction to obtain an upper triangular groove (4-1) which is concave downwards and a lower triangular groove (4-2) which is concave upwards; a plurality of lower ring blocks (5) are uniformly arranged along the length direction of a roller body (3) of the lower roller (2), and the lower ring blocks (5) are split along the up-down direction to obtain an upper convex triangular bump (5-1) protruding upwards and a lower convex triangular bump (5-2) protruding downwards; an upper triangular lug (5-1) in the lower roller (2) is matched, meshed and embedded into a lower triangular groove (4-2) of the upper roller (1).
2. A chromium alloy large-sized section steel finishing roll according to claim 1, characterized in that: the upper roller (1) is further provided with a bearing installation part (6), a connection part (7) and a transmission part (8), the bearing installation part (6) is symmetrically arranged at the left end and the right end of the roller body (3) of the upper roller (1), the connection part (7) is arranged on the left side of the left bearing installation part (6), and the transmission part (8) is arranged on the right side of the right bearing installation part (6).
3. A chromium alloy large-sized section steel finishing roll according to claim 1, characterized in that: the lower roll (2) is further provided with a bearing installation part (6), a connection part (7) and a transmission part (8), the bearing installation part (6) is symmetrically arranged at the left end and the right end of the roll body (3) of the lower roll (2), the connection part (7) is arranged on the left side of the left bearing installation part (6), and the transmission part (8) is arranged on the right side of the right bearing installation part (6).
4. The manufacturing method of a chromium alloy large-sized section steel finishing roll as claimed in claim 1, wherein: the specific manufacturing steps are as follows:
the first step is that the roller is prepared by the following raw materials by weight:
0.35 to 0.65% of carbon,
0.45 to 0.75 percent of silicon,
0.60 to 0.80 percent of manganese,
0.60 to 1.00 percent of nickel,
4.00 to 6.00 percent of chromium,
0.50-0.80% of vanadium;
secondly, adding furnace burden in a power frequency electric furnace, performing low-power current operation, when the furnace burden enters a critical temperature, rapidly raising the temperature at a high power, completely melting the furnace burden, adding alloy when the temperature of steel rises to 1430-1480 ℃, sequentially slagging by using a slagging agent after several minutes, wherein the addition amount of the slagging agent is 15-20 kg/ton of steel, the slagging agent added in the process reacts with impurity elements of phosphorus and sulfur and gas elements of hydrogen and oxygen to form dross, cleaning the dross after several minutes, and adding high-melting-point alloy when the temperature rises to 1550-1570 ℃ after the completion of cleaning; secondly, carrying out secondary slagging, wherein the addition amount of a slagging agent used in the secondary slagging process is 10-15 kg/ton of steel, removing slag after several minutes, then adding 3-5 kg/ton of steel yttrium based heavy rare earth molten steel modificator, removing residual impurity elements and gas elements, activating other alloy elements by using active elements, organically fusing, then heating to 1580-1620 ℃, adding 0.03-0.05% of aluminum into each ton of molten steel for deoxidation and tapping, blowing argon to float fine slag, and carrying out calming for 8-15 minutes for pouring;
thirdly, pouring by adopting a top pouring process, wherein the pouring temperature is the liquid phase temperature plus 20-30 ℃, the pouring speed is controlled according to the roll shape and the weight, an electromagnetic vibrator is started to vibrate after the pouring is finished, the frequency is 60-120 times/min, and a riser is covered with a heat insulating agent;
step four, the roller adopts a hot box opening process: the roller temperature is subjected to unpacking and furnace charging heat treatment at 550-650 ℃, heat preservation is carried out for 6-8 hours after diffusion annealing enters the furnace, then the roller temperature is 10-20 ℃/hour to 1050-1100 ℃, after heat preservation is carried out for 20-40 hours, furnace cooling is carried out on a trolley to 450-500 ℃, furnace spheroidizing is carried out, the temperature is raised for 20-30 hours, after the roller temperature is 780-850 ℃, heat preservation is carried out for 20-30 hours, then air cooling, normalizing and tempering are carried out: and (3) after air cooling to normal temperature, furnace normalizing, heating to the temperature of 10-15 ℃ per hour, preserving heat for several hours when the temperature is 660-680 ℃, heating to 980 ℃ at the speed of 15-30 ℃/hour, preserving heat for 20-40 hours, air cooling, cooling to 200-400 ℃, then furnace tempering, heating at the speed of 30-40 ℃/hour, preserving heat for 6-10 hours when the temperature is 550-600 ℃, then furnace cooling, and taking out from the furnace when the roll temperature is 200 +/-5 ℃ after the cooling speed is 30-50 ℃/hour.
5. The manufacturing method of a chromium alloy large-sized section steel finishing roll according to claim 4, characterized in that: in the first step, the raw material of the roller also contains phosphorus of less than or equal to 0.020%.
6. The manufacturing method of a chromium alloy large-sized section steel finishing roll according to claim 4, characterized in that: in the first step, the raw material of the roller also has sulfur of less than or equal to 0.020%.
7. The manufacturing method of a chromium alloy large-sized section steel finishing roll according to claim 4, characterized in that: in the first step, the raw material of the roller also has rhenium more than or equal to 0.03 percent.
8. The manufacturing method of a chromium alloy large-sized section steel finishing roll according to claim 4, characterized in that: in the second step, the slag former is prepared by mixing cullet, silicon-manganese particles, molding new sand, industrial alkali and fluorite.
9. The manufacturing method of a chromium alloy large-sized section steel finishing roll according to claim 4, characterized in that: in the second step, the slagging agent for secondary slagging is prepared by mixing calcium oxide, calcium carbide and the balance of industrial alkali.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010570386.5A CN111790757A (en) | 2020-06-19 | 2020-06-19 | Chromium alloy large-scale section steel finishing roll and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010570386.5A CN111790757A (en) | 2020-06-19 | 2020-06-19 | Chromium alloy large-scale section steel finishing roll and manufacturing method thereof |
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| CN111790757A true CN111790757A (en) | 2020-10-20 |
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| CN202010570386.5A Pending CN111790757A (en) | 2020-06-19 | 2020-06-19 | Chromium alloy large-scale section steel finishing roll and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112792304A (en) * | 2020-12-07 | 2021-05-14 | 邢台德龙机械轧辊有限公司 | Preparation method of large chromium alloy strip steel supporting roll |
| CN114472528A (en) * | 2022-02-08 | 2022-05-13 | 南京钢铁股份有限公司 | Roller machining method for increasing negative tolerance of 22-specification finished deformed steel bar |
-
2020
- 2020-06-19 CN CN202010570386.5A patent/CN111790757A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112792304A (en) * | 2020-12-07 | 2021-05-14 | 邢台德龙机械轧辊有限公司 | Preparation method of large chromium alloy strip steel supporting roll |
| CN114472528A (en) * | 2022-02-08 | 2022-05-13 | 南京钢铁股份有限公司 | Roller machining method for increasing negative tolerance of 22-specification finished deformed steel bar |
| CN114472528B (en) * | 2022-02-08 | 2024-01-09 | 南京钢铁股份有限公司 | Roller machining method for increasing negative tolerance of 22-specification finished deformed steel bar |
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