CN110935838B - Roller processing method suitable for improving forging penetration and shortening heat treatment period - Google Patents
Roller processing method suitable for improving forging penetration and shortening heat treatment period Download PDFInfo
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- CN110935838B CN110935838B CN201911352659.2A CN201911352659A CN110935838B CN 110935838 B CN110935838 B CN 110935838B CN 201911352659 A CN201911352659 A CN 201911352659A CN 110935838 B CN110935838 B CN 110935838B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/02—Making machine elements balls, rolls, or rollers, e.g. for bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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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
- C21D1/28—Normalising
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22C38/06—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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
Abstract
The invention relates to a roller processing method suitable for improving forging penetration and shortening heat treatment period, which sequentially comprises the steps of selecting steel ingot blanking → carrying out forging process on the steel ingot to form a roller blank → carrying out heat treatment normalizing process on the roller blank → rough turning of the roller blank → semi-finishing of the roller blank. The forging method and the heat treatment method in the production process are improved, so that the prepared roller has good outer surface quality, low inclusion, fine grain of a spheroidized structure and low carbide grade, the hardness after heat treatment is lower than the standard requirement, the requirement of a user is met, about 40 percent of furnace time is saved, the energy consumption is reduced, and the cost is saved.
Description
Technical Field
The invention relates to a roller processing method suitable for improving forging penetration and shortening a heat treatment period.
Background
The roller is known as the 'steel material' and is a tool for causing plastic deformation of metal materials in the rolling production of metals such as steel, aluminum, copper and the like, is an important large part for determining the production efficiency of a rolling mill, the quality and the economical efficiency of rolled materials, is an indispensable key part and the most main large consumption part for rolling the rolling mill, and has the consumption cost of 5-15% of the production cost of rolled steel. The production cost is higher if the factors of production halt, production reduction and equipment maintenance increase caused by roll consumption are considered.
The existing roller in the market has the problems that the surface layer of the roller has more hydrogen content, high inclusion content, easy damage and unbalanced texture in the roller in the production process, so that the whole roller has low quality and short service life.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the roller processing method suitable for improving the forging penetration and shortening the heat treatment period is provided, and the technical problems are solved by the conventional production method.
The technical scheme adopted by the invention for solving the technical problems is as follows: a roller processing method suitable for improving forging penetration and shortening heat treatment period sequentially comprises the steps of selecting steel ingots for blanking → carrying out forging process on the steel ingots to form roller blanks → carrying out heat treatment normalizing process on the roller blanks → carrying out rough turning on the roller blanks → carrying out semi-finishing on the roller blanks.
Further, the forging process of the steel ingot comprises the following steps: and (3) upsetting and drawing the steel ingot for three times to obtain a cold-rolling roller blank, wherein after primary upsetting, the obtained blank is charged into a furnace for primary annealing and hydrogen diffusion treatment, and after secondary upsetting, the obtained blank is charged into the furnace for secondary annealing and hydrogen diffusion treatment.
Furthermore, the forging temperature of each upsetting and drawing is more than or equal to 1100 ℃, and the final forging temperature is more than or equal to 900 ℃; returning to the furnace for heating after the first upsetting and drawing, controlling the temperature of the furnace according to 1200 +/-10 ℃, and keeping the temperature for 2-5 hours;
after the first annealing hydrogen diffusion treatment, the steel is returned to the furnace and heated according to the following process conditions: controlling the temperature of the charging furnace according to 570 +/-10 ℃, keeping the temperature for 6-10 hours, then heating to 880 +/-10 ℃, keeping the temperature for 6-10 hours, then heating to 1300 +/-10 ℃, keeping the temperature for 40-55 hours, finally cooling to 1200 +/-10 ℃, and keeping the temperature for 2-6 hours;
and returning to the furnace for heating after the third upsetting, controlling the furnace charging temperature according to 1200 +/-10 ℃, and keeping the temperature for 2-5 hours.
Further, the upset ratio per upset was 1/2;
upsetting and then drawing out each upsetting and drawing out the steel bar by adopting an FM method;
the drawing deformation process is controlled according to 'light-heavy-light', the light deformation is controlled according to the unilateral reduction of 30-60 mm, the heavy deformation is controlled according to the unilateral reduction of 130-170 mm, and the feeding amount is 200-300 mm;
the third drawing adopts a breaker to strengthen the deformation, so that the deformation of the whole roller is ensured to be more than or equal to 30 percent;
the diameter of the cold-rolling roller blank obtained by three times of upsetting and drawing is phi 300 mm-600 mm.
Further, after the second annealing and hydrogen diffusion treatment, the steel is returned to the furnace and heated according to the following process conditions: controlling the temperature of the charging furnace according to 500 +/-10 ℃, keeping the temperature for 8-12 hours, then heating to 880 +/-10 ℃, keeping the temperature for 13-18 hours, finally cooling to 680 +/-20 ℃, and keeping the temperature for 16-20 hours.
Further, the chemical components of the steel ingot comprise, by mass: 0.80 to 0.92 percent of C, 0.40 to 0.85 percent of Si, 0.30 to 0.70 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 4.7 to 5.3 percent of Cr4, 0.25 to 0.50 percent of Mo0, 0.20 to 0.40 percent of V, 0.1 to 0.30 percent of Ni0.010 to 0.040 percent of Al, 0.05 to 0.25 percent of Re + Ce, less than or equal to 1.5ppm of H, less than or equal to 30ppm of O, less than or equal to 120ppm of N, and the balance of Fe.
Further, the normalizing process for the heat treatment of the roller blank comprises the following steps:
step S1, controlling the temperature of the normalized roller blank to be 680 +/-20 ℃ for waiting, and carrying out the next step after the temperature of the roller blank is uniform; in the step S1, the forged roller blank is directly placed into a resistance furnace without air cooling, the furnace temperature is 680 +/-20 ℃ for heat preservation in a heat treatment furnace, and the surface temperature of the roller blank is above Bs when the roller blank is placed into the heat treatment furnace;
step S2, cooling the resistance furnace to 220-270 ℃ and carrying out deep cooling treatment;
step S3, austenitizing and uniformly treating, controlling the furnace temperature to be 850-870 ℃, and carrying out soaking and heat preservation treatment; the heat preservation time is calculated according to the effective thickness (1.5-1.8) h/100mm of the roller blank, and the soaking time is calculated according to half of the heat preservation time;
step S4, cooling the furnace to 670 +/-20 ℃ to balance the transformation temperature and perform isothermal structure transformation, wherein the heat preservation time is 90-150 hours;
and step S5, cooling the resistance furnace to normal temperature, and discharging the roller blank.
Further, in step S2, the furnace temperature of the heat treatment furnace is cooled to a deep cooling temperature and is kept at the deep cooling temperature, and the heat preservation time is calculated according to the effective thickness (1.5-2.0) h/100mm of the roller blank.
Further, in step S5, the furnace is cooled to less than or equal to 150 ℃ at the speed of less than or equal to 6 ℃/h and discharged.
The invention has the beneficial effects that:
the roller processing method suitable for improving forging permeability and shortening heat treatment period improves the forging method and the heat treatment method in the production process, so that the prepared roller has good outer surface quality, low inclusion, fine spheroidized structure grains and low carbide grade, the hardness after heat treatment is lower than the standard requirement, the requirement of a user is met, about 40 percent of furnace time is saved, the energy consumption is reduced, and the cost is saved.
The hydrogen content of the roll blank obtained by the forging process is effectively controlled below 1ppm, the situations of white spots and unqualified flaw detection are avoided, and the method is particularly suitable for forging steel ingots for 8Cr5MoV, Cr5 and MC5D cold rolls. The invention further provides a whole set of manufacturing method of the cold-rolled roller blank, and the cold-rolled roller blank is prepared by the method.
The specific test results are as follows:
(1) non-metallic inclusions: class A0.0-0.5, class B0.0-0.5, class C0.0-0.5, class D0.0-0.5, class DS 0.0-0.5.
(2) 0.0 to 1.5 grades of net-shaped carbide and 0.5 to 2.0 grades of liquated carbide.
(3) Spheroidized structure: 1.0-2.5 grade.
(4) The content of [ H ] is 1ppm or less.
(5) HBW is 25 or less.
And the residual heat after the roller blank is forged is utilized to perform primary balance structure transformation, so that the inner and outer structures of the roller blank are uniform. Compared with the multiple normalizing heat treatment process after forging in the prior art, the method fully utilizes the afterheat after forging, reduces the austenitizing times, can obtain a pearlite type balance structure after the balance structure is transformed, cuts off the inheritance of an original coarse structure, and achieves the effect of refining grains.
The roller blank heat treatment normalizing process has the advantages that the grain size can reach 6.5 grade, the absolute value and the uniformity of the grain size reach higher quality, and the process effect is better; after the post-forging heat treatment is carried out by adopting the multiple normalizing and tempering process mode in the prior art, the roller blank is sampled to carry out grain size evaluation, and the result shows that the grain size evaluation is 4.5 grade.
Compared with the multiple normalizing heat treatment process after forging in the prior art, the heat treatment method only needs about 500 hours, and the temperature of other steps is only about 650 ℃ or below except for slightly higher austenitizing treatment; in the prior art, the normalizing operation is generally carried out for more than three times at 850-1000 ℃ and the tempering treatment is carried out, and the total time of furnace consumption reaches more than 830 hours. Therefore, the process of the invention can shorten the heat treatment period,
the final speed limiting furnace cooling of the heat treatment method can avoid the cracking of the roller blank due to overlarge internal stress.
Detailed Description
The invention will now be further described with reference to specific examples.
A roller processing method suitable for improving forging penetration and shortening heat treatment period sequentially comprises the steps of selecting steel ingots for blanking → carrying out forging process on the steel ingots to form roller blanks → carrying out heat treatment normalizing process on the roller blanks → carrying out rough turning on the roller blanks → carrying out semi-finishing on the roller blanks.
Specifically, the forging process of the steel ingot comprises the following steps: and (3) upsetting and drawing the steel ingot for three times to obtain a cold-rolling roller blank, wherein after primary upsetting, the obtained blank is charged into a furnace for primary annealing and hydrogen diffusion treatment, and after secondary upsetting, the obtained blank is charged into the furnace for secondary annealing and hydrogen diffusion treatment.
By adopting a three-pier three-drawing process, the deformation is increased, the structure is refined, and the quality defects of internal looseness, shrinkage cavity and the like of the product can be improved to the greatest extent.
Specifically, the forging temperature of each upsetting and drawing is more than or equal to 1100 ℃, and the final forging temperature is more than or equal to 900 ℃; returning to the furnace for heating after the first upsetting and drawing, controlling the temperature of the furnace according to 1200 +/-10 ℃, and keeping the temperature for 2-5 hours;
after the first annealing hydrogen diffusion treatment, the steel is returned to the furnace and heated according to the following process conditions: controlling the temperature of the charging furnace according to 570 +/-10 ℃, keeping the temperature for 6-10 hours, then heating to 880 +/-10 ℃, keeping the temperature for 6-10 hours, then heating to 1300 +/-10 ℃, keeping the temperature for 40-55 hours, finally cooling to 1200 +/-10 ℃, and keeping the temperature for 2-6 hours;
and returning to the furnace for heating after the third upsetting, controlling the furnace charging temperature according to 1200 +/-10 ℃, and keeping the temperature for 2-5 hours.
Specifically, the upset ratio per upset was 1/2;
upsetting and then drawing out each upsetting and drawing out the steel bar by adopting an FM method;
the drawing deformation process is controlled according to 'light-heavy-light', the light deformation is controlled according to the unilateral reduction of 30-60 mm, the heavy deformation is controlled according to the unilateral reduction of 130-170 mm, and the feeding amount is 200-300 mm;
the third drawing adopts a breaker to strengthen the deformation, so that the deformation of the whole roller is ensured to be more than or equal to 30 percent;
the diameter of the cold-rolling roller blank obtained by three times of upsetting and drawing is phi 300 mm-600 mm.
Specifically, after the second annealing and hydrogen diffusion treatment, the steel is returned to the furnace and heated according to the following process conditions: controlling the temperature of the charging furnace according to 500 +/-10 ℃, keeping the temperature for 8-12 hours, then heating to 880 +/-10 ℃, keeping the temperature for 13-18 hours, finally cooling to 680 +/-20 ℃, and keeping the temperature for 16-20 hours.
Specifically, the chemical components of the steel ingot are as follows by mass percent: 0.80 to 0.92 percent of C, 0.40 to 0.85 percent of Si, 0.30 to 0.70 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 4.7 to 5.3 percent of Cr4, 0.25 to 0.50 percent of Mo0, 0.20 to 0.40 percent of V, 0.1 to 0.30 percent of Ni0.010 to 0.040 percent of Al, 0.05 to 0.25 percent of Re + Ce, less than or equal to 1.5ppm of H, less than or equal to 30ppm of O, less than or equal to 120ppm of N, and the balance of Fe.
The key point of the forging method is that special annealing hydrogen diffusion treatment is carried out after the second upsetting and drawing, the structure stress release and hydrogen diffusion can be ensured through the operation, the hydrogen content can be controlled below 1ppm even if the forging method is produced in rainy season, and the conditions of white spots and flaw detection failure are avoided.
Specifically, the roller blank heat treatment normalizing process comprises the following steps of:
step S1, controlling the temperature of the normalized roller blank to be 680 +/-20 ℃ for waiting, and carrying out the next step after the temperature of the roller blank is uniform; in the step S1, the forged roller blank is directly placed into a resistance furnace without air cooling, the furnace temperature is 680 +/-20 ℃ for heat preservation in a heat treatment furnace, and the surface temperature of the roller blank is above Bs when the roller blank is placed into the heat treatment furnace;
step S2, cooling the resistance furnace to 220-270 ℃ and carrying out deep cooling treatment;
step S3, austenitizing and uniformly treating, controlling the furnace temperature to be 850-870 ℃, and carrying out soaking and heat preservation treatment; the heat preservation time is calculated according to the effective thickness (1.5-1.8) h/100mm of the roller blank, and the soaking time is calculated according to half of the heat preservation time;
step S4, cooling the furnace to 670 +/-20 ℃ to balance the transformation temperature and perform isothermal structure transformation, wherein the heat preservation time is 90-150 hours;
and step S5, cooling the resistance furnace to normal temperature, and discharging the roller blank.
Specifically, in step S2, the furnace temperature of the heat treatment furnace is cooled to a deep cooling temperature and kept at the deep cooling temperature, and the heat preservation time is calculated according to the effective thickness (1.5-2.0) h/100mm of the roller blank.
Specifically, in step S5, the furnace is cooled to 150 ℃ or lower at the speed of 6 ℃/h or lower and discharged.
The roller processing method suitable for improving forging permeability and shortening heat treatment period improves the forging method and the heat treatment method in the production process, so that the prepared roller has good outer surface quality, low inclusion, fine spheroidized structure grains and low carbide grade, the hardness after heat treatment is lower than the standard requirement, the requirement of a user is met, about 40 percent of furnace time is saved, the energy consumption is reduced, and the cost is saved.
The hydrogen content of the roll blank obtained by the forging process is effectively controlled below 1ppm, the situations of white spots and unqualified flaw detection are avoided, and the method is particularly suitable for forging steel ingots for 8Cr5MoV, Cr5 and MC5D cold rolls. The invention further provides a whole set of manufacturing method of the cold-rolled roller blank, and the cold-rolled roller blank is prepared by the method.
The specific test results are as follows:
(1) non-metallic inclusions: class A0.0-0.5, class B0.0-0.5, class C0.0-0.5, class D0.0-0.5, class DS 0.0-0.5.
(2) 0.0 to 1.5 grades of net-shaped carbide and 0.5 to 2.0 grades of liquated carbide.
(3) Spheroidized structure: 1.0-2.5 grade.
(4) The content of [ H ] is 1ppm or less.
(5) HBW is 25 or less.
And the residual heat after the roller blank is forged is utilized to perform primary balance structure transformation, so that the inner and outer structures of the roller blank are uniform. Compared with the multiple normalizing heat treatment process after forging in the prior art, the method fully utilizes the afterheat after forging, reduces the austenitizing times, can obtain a pearlite type balance structure after the balance structure is transformed, cuts off the inheritance of an original coarse structure, and achieves the effect of refining grains.
The roller blank heat treatment normalizing process has the advantages that the grain size can reach 6.5 grade, the absolute value and the uniformity of the grain size reach higher quality, and the process effect is better; after the post-forging heat treatment is carried out by adopting the multiple normalizing and tempering process mode in the prior art, the roller blank is sampled to carry out grain size evaluation, and the result shows that the grain size evaluation is 4.5 grade.
Compared with the multiple normalizing heat treatment process after forging in the prior art, the heat treatment method only needs about 500 hours, and the temperature of other steps is only about 650 ℃ or below except for slightly higher austenitizing treatment; in the prior art, the normalizing operation is generally carried out for more than three times at 850-1000 ℃ and the tempering treatment is carried out, and the total time of furnace consumption reaches more than 830 hours. Therefore, the process of the invention can shorten the heat treatment period.
The final speed limiting furnace cooling of the heat treatment method can avoid the cracking of the roller blank due to overlarge internal stress.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. A roller processing method suitable for improving forging penetration and shortening heat treatment period is characterized by sequentially comprising the steps of selecting steel ingots for blanking → carrying out forging process on the steel ingots to form roller blanks → carrying out heat treatment normalizing process on the roller blanks → carrying out rough turning on the roller blanks → carrying out semi-finishing on the roller blanks;
the forging process of the steel ingot comprises the following steps: carrying out three times of upsetting and drawing out on the steel ingot to obtain a cold-rolling roller blank, wherein after the first upsetting, the obtained blank is charged into a furnace for carrying out first annealing and hydrogen diffusion treatment, and after the second upsetting, the obtained blank is charged into the furnace for carrying out second annealing and hydrogen diffusion treatment;
after the second annealing and hydrogen diffusion treatment, the steel is returned to the furnace and heated according to the following process conditions: controlling the temperature of the charging furnace according to 500 +/-10 ℃, keeping the temperature for 8-12 hours, then heating to 880 +/-10 ℃, keeping the temperature for 13-18 hours, finally cooling to 680 +/-20 ℃, and keeping the temperature for 16-20 hours;
the heat treatment normalizing process for the roller blank comprises the following steps:
step S1, controlling the temperature of the normalized roller blank to be 680 +/-20 ℃ for waiting, and carrying out the next step after the temperature of the roller blank is uniform; in the step S1, the forged roller blank is directly placed into a resistance furnace without air cooling, the furnace temperature is 680 +/-20 ℃ for heat preservation, and the surface temperature of the roller blank is above Bs when the roller blank is placed into the resistance furnace;
step S2, cooling the resistance furnace to 220-270 ℃ and carrying out cryogenic treatment;
step S3, austenitizing and uniformly treating, controlling the furnace temperature to be 850-870 ℃, and carrying out soaking and heat preservation treatment; the heat preservation time is calculated according to the effective thickness (1.5-1.8) h/100mm of the roller blank, and the soaking time is calculated according to half of the heat preservation time;
step S4, cooling the furnace to 670 +/-20 ℃ to balance the transformation temperature and perform isothermal structure transformation, wherein the heat preservation time is 90-150 hours;
and step S5, cooling the resistance furnace to normal temperature, and discharging the roller blank.
2. The method for processing a roll suitable for improving the forging penetration and shortening the heat treatment period as claimed in claim 1, wherein the start forging temperature per upsetting is not less than 1100 ℃ and the finish forging temperature is not less than 900 ℃; returning to the furnace for heating after the first upsetting and drawing, controlling the temperature of the furnace according to 1200 +/-10 ℃, and keeping the temperature for 2-5 hours;
after the first annealing hydrogen diffusion treatment, the steel is returned to the furnace and heated according to the following process conditions: controlling the temperature of the charging furnace according to 570 +/-10 ℃, keeping the temperature for 6-10 hours, then heating to 880 +/-10 ℃, keeping the temperature for 6-10 hours, then heating to 1300 +/-10 ℃, keeping the temperature for 40-55 hours, finally cooling to 1200 +/-10 ℃, and keeping the temperature for 2-6 hours;
and returning to the furnace for heating after the third upsetting, controlling the furnace charging temperature according to 1200 +/-10 ℃, and keeping the temperature for 2-5 hours.
3. The method for roll processing suitable for improving forgeability and shortening heat treatment cycle according to claim 1, wherein the upset ratio per upset is 1/2;
upsetting and then drawing out each upsetting and drawing out the steel bar by adopting an FM method;
the drawing deformation process is controlled according to 'light-heavy-light', the light deformation is controlled according to the unilateral reduction of 30-60 mm, the heavy deformation is controlled according to the unilateral reduction of 130-170 mm, and the feeding amount is 200-300 mm;
the third drawing adopts a breaker to strengthen the deformation, so that the deformation of the whole roller is ensured to be more than or equal to 30 percent;
the diameter of the cold-rolling roller blank obtained by three times of upsetting and drawing is phi 300 mm-600 mm.
4. The method for processing a roll suitable for improving forgeability and shortening a heat treatment cycle according to claim 1,
the steel ingot comprises the following chemical components in percentage by mass: 0.80 to 0.92 percent of C, 0.40 to 0.85 percent of Si, 0.30 to 0.70 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 4.7 to 5.3 percent of Cr4, 0.25 to 0.50 percent of Mo0, 0.20 to 0.40 percent of V, 0.1 to 0.30 percent of Ni0.010 to 0.040 percent of Al, 0.05 to 0.25 percent of Re + Ce, less than or equal to 1.5ppm of H, less than or equal to 30ppm of O, less than or equal to 120ppm of N, and the balance of Fe.
5. The method of roll processing suitable for improving forgeability and shortening heat treatment period as claimed in claim 1, wherein the furnace temperature of the resistance furnace is cooled to a cryogenic temperature and maintained at the cryogenic temperature for a holding time calculated as effective thickness (1.5-2.0) h/100mm of the roll blank at step S2.
6. The method for processing a roll suitable for improving the forgeability and shortening the heat treatment period as set forth in claim 1, wherein the roll is discharged from the furnace at a rate of 6 ℃/h or less to 150 ℃ or less in step S5.
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