CN113832310A - Post-forging annealing process of large-specification Cr5 cold roll - Google Patents
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- 238000005242 forging Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000000137 annealing Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 67
- 238000004321 preservation Methods 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 3
- 241000519995 Stachys sylvatica Species 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
- C22C38/44—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
Abstract
The invention relates to a post-forging annealing process of a large-specification Cr5 cold roll, which comprises the following steps: after forging, quickly cooling the forging to 350-400 ℃, heating to 600-650 ℃ at full power for waiting for material, preserving heat for 1h/100mm, heating to 960-1000 ℃ at a speed of less than or equal to 80 ℃/h, and preserving heat for 1-2 h/100 mm. After the heat preservation is finished, quickly cooling to 350-400 ℃, and preserving the heat for 1.5-2.5 h/100 mm; heating to 600-650 ℃ at a speed of less than or equal to 80 ℃/h, preserving heat for 1h/100mm, heating to 870-910 ℃ at a speed of less than or equal to 80 ℃/h, preserving heat for 1-2 h/100mm, quickly cooling to 300-350 ℃ after heat preservation, and preserving heat for 1.5-2.5 h/100 mm; the temperature is increased to 800-850 ℃ at a speed of less than or equal to 80 ℃/h, the temperature is kept for 1-2 h/100mm, the furnace cooling is carried out at a speed of less than or equal to 30 ℃/h to 700-750 ℃ after the heat preservation is finished, the temperature is kept for 3.5-4.5 h/100mm, the furnace cooling is carried out at a speed of less than or equal to 10 ℃/h to 640-680 ℃ after the heat preservation is finished, the furnace cooling is carried out at a speed of less than or equal to 40 ℃/h to 500 ℃ after the heat preservation is finished, and the furnace cooling is carried out at a speed of less than or equal to 20 ℃/h to less than or equal to 150 ℃ for discharging and air cooling.
Description
Technical Field
The invention belongs to the technical field of manufacturing processes of steel for rollers, and particularly relates to a post-forging annealing process of a large-specification Cr5 cold roller.
Background
The design requirement of the Cr5 cold roll is that the grain size is more than or equal to grade 5, the spheroidized structure is 1-4 grade, and the reticular structure is less than or equal to grade 2. For the roller with the diameter of less than 700mm, the requirement is easy to meet, and along with the increase of the diameter of the cold roller, the difficulty of meeting the design requirement is increased. In addition, the Cr5 cold roll steel belongs to the third class of steel, the white spot sensitivity is high, electroslag remelting is generally adopted in production, and the prevention of the generation of white spots is also one of the main tasks of heat treatment after forging, so that a proper heat treatment process needs to be adopted to solve the problems after forging.
The large Cr5 cold roll has many times of forging, long high temperature retention time, easy formation of coarse grains and directional acicular ferrite group, which is a reflector of ultrasonic wave to generate forest noise. Coarse carbides precipitated on the grain boundary and solution interior also generate forest clutter. The existence of forest clutter reduces the accuracy of ultrasonic flaw detection, and serious forest clutter prevents ultrasonic flaw detection. The Cr5 cold roll steel belongs to hypereutectoid steel, when the steel is cooled slowly after being forged, a large amount of eutectoid carbide is precipitated along a crystal boundary, a reticular distribution phenomenon occurs, the spheroidization effect of the structure is reduced due to the existence of a reticular structure, the spheroidization effect is difficult to eliminate during subsequent quenching and heating, the mechanical property of the steel is reduced, and the grade of the reticular structure is strictly controlled.
One of the most detrimental effects of hydrogen in steel is the creation of white spots, often causing forgings to scrap. White spots are internal defects in the metal that are shaped as microscopic cracks of different lengths and in different directions. Sawtoothed fine cracks are formed on a transverse macroscopic test piece of the forging; the longitudinal fractures are rounded or oval spots with a sharp edge and silvery white luster. Although the content of hydrogen controlled in the forgings is effectively controlled with the continuous development of vacuum metallurgy technology, most of the forgings are mainly produced by conventional smelting and pouring, particularly electroslag remelting is adopted, and hydrogen absorption can occur in the production process, so that the prevention of white spots is still an important problem which needs to be solved at present.
The Cr5 cold roll steel belongs to the third class of steel and is an alloy steel type with stronger white spot sensitivity, and the heat treatment process after forging is not suitable, so that white spots are easy to generate, and the product is scrapped.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a post-forging annealing process of a large-size Cr5 cold roll for improving the problems of coarse grains, reticulation, spheroidization and hydrogen diffusion of the roll.
The scheme of the invention for achieving the aim is as follows: a post-forging annealing process of a large-size Cr5 cold roll comprises the following specific steps:
step 1), after forging, quickly cooling a forging piece to 350-400 ℃, heating the forging piece to 600-650 ℃ at full power for waiting for material, keeping the temperature for 1h/100mm, then heating the forging piece to 960-1000 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1-2 h/100mm, quickly cooling the forging piece to 350-400 ℃ after heat preservation, and keeping the temperature for 1.5-2.5 h/100 mm;
step 2), heating to 600-650 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1h/100mm, then heating to 870-910 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1-2 h/100mm, rapidly cooling to 300-350 ℃ after the heat preservation is finished, and keeping the temperature for 1.5-2.5 h/100 mm;
and 3) heating to 800-850 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1-2 h/100mm, cooling to 700-750 ℃ at a speed of less than or equal to 30 ℃/h after heat preservation, keeping the temperature for 3.5-4.5 h/100mm, cooling to 640-680 ℃ at a speed of less than or equal to 10 ℃/100mm after heat preservation, keeping the temperature for 4-10 h/100mm, cooling to 500 ℃ at a speed of less than or equal to 40 ℃/h after heat preservation, and cooling to 150 ℃ or less at a speed of less than or equal to 20 ℃/h.
Preferably, the rapid cooling in the step 1) is gap water cooling or fog cooling.
Preferably, in the step 1), when the temperature is increased by less than or equal to 80 ℃/h, the optimal temperature is 970 +/-10 ℃, and the optimal heat preservation time is 1.5h/100 mm; and after the heat preservation is finished, quickly cooling to 350-400 ℃, wherein the optimal heat preservation time is 2h/100 mm.
Preferably, in the step 2), when the temperature is raised for the second time at a rate of less than or equal to 80 ℃/h, the optimal temperature rise is 890 +/-10 ℃, the optimal heat preservation time is 1.5h/100mm, and after the heat preservation is finished, the temperature is quickly cooled to 300-350 ℃, and the optimal heat preservation time is 2h/100 mm.
Preferably, in the step 3), when the temperature is increased by less than or equal to 80 ℃/h, the optimal temperature is 830 +/-10 ℃; when the furnace cooling is carried out at a temperature of less than or equal to 30 ℃/h after the heat preservation is finished, the optimal furnace cooling temperature is 710 +/-10 ℃, and the optimal heat preservation time is 4h/100 mm; when the furnace cooling is carried out at the temperature of less than or equal to 10 ℃/100mm after the heat preservation is finished, the optimal furnace cooling temperature is 650 +/-10 ℃; after the heat preservation is finished, the furnace is cooled to 500 ℃ at the speed of less than or equal to 40 ℃/h, and then the furnace is cooled to less than or equal to 150 ℃ at the speed of less than or equal to 20 ℃/h, and the furnace is taken out for air cooling.
Preferably, the Cr5 cold roll is steel for the cold roll, wherein the mass percent of chromium is 4.8-5.1%, the mass percent of carbon is 0.78-0.90%, the mass percent of molybdenum is 0.20-0.60%, and the mass percent of vanadium is 0.10-0.20%.
Preferably, the large-size Cr5 cold roll is an electroslag ingot forging; the diameter of the cold roll body is between 700mm and 1000 mm.
The technical scheme of the invention has the following positive effects:
1. after forging, the forging is quickly cooled to 350-400 ℃, and after forging, the quick cooling can effectively prevent carbide from being separated out at a crystal boundary to form net-shaped carbide. Heating to 600-650 ℃ at full power, waiting for material, preserving heat, then heating to 960-1000 ℃ at a speed of less than or equal to 80 ℃/h, and preserving heat. And (4) heating at high temperature to dissolve carbide, and uniformly coarsening crystal grains of the forged piece. After heat preservation, quickly cooling to 350-400 ℃, preserving heat, preventing carbides from forming a net shape by quick cooling, pre-cooling and keeping to form a ferrite carbide structure, and accelerating hydrogen escape;
2. heating to 600-650 ℃ at a speed of less than or equal to 80 ℃/h, preserving heat, then heating to 870-910 ℃ at a speed of less than or equal to 80 ℃/h, and preserving heat. And (5) quickly cooling to 300-350 ℃ after heat preservation is finished, and preserving heat. Heating to a lower temperature and quickly cooling to refine grains coarsened by high-temperature normalizing, quickly cooling to reduce the precipitation of carbide along a grain boundary, reduce the level of a carbide network structure, and further accelerate the escape of hydrogen by low-temperature maintenance.
3. Raising the temperature to 800-850 ℃ at a speed of less than or equal to 80 ℃/h, preserving heat, furnace-cooling to 700-750 ℃ at a speed of less than or equal to 30 ℃/h after heat preservation, preserving heat, furnace-cooling to 640-680 ℃ at a speed of less than or equal to 10 ℃/h after heat preservation. After the heat preservation is finished, the furnace is cooled to 500 ℃ at the speed of less than or equal to 40 ℃/h, and then the furnace is cooled to less than or equal to 150 ℃ at the speed of less than or equal to 20 ℃/h, and the furnace is taken out for air cooling. And spheroidizing the structure and carbide by adopting isothermal spheroidization to obtain a spheroidized structure. And (3) performing heat preservation and subsequent speed-limited cooling at 640-680 ℃ to finish pearlite structure transformation, so that hydrogen atoms escape, the hydrogen atoms which do not escape are uniformly distributed, and white spots are prevented from being generated.
Drawings
Fig. 1 is a diagram of an annealing process of the present invention.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific embodiments, but the scope of the present invention is not limited thereto.
Example 1: as shown in figure 1, the post-forging annealing process of the large-specification Cr5 cold roll has the specification of phi 700mm multiplied by 3950mm and comprises the following chemical components in percentage by mass: c: 0.84%, Si 0.68%, Mn 0.41%, Ni: 0.32%, Cr: 4.94%, Mo: 0.22%, V: 0.13 percent, and the balance of Fe and other inevitable impurities, and adopts an electroslag ingot.
Step 1), after forging, quickly cooling a forged piece to 350-400 ℃, heating to 600-650 ℃ at full power for waiting for material, preserving heat for 7 hours, then heating to 970 +/-10 ℃ at a speed of 60-70 ℃/h, and preserving heat for 10.5 hours; and after the heat preservation is finished, quickly cooling to 350-400 ℃, and preserving heat for 14 hours.
Step 2), heating to 650 +/-10 ℃ at a speed of 60-70 ℃/h, preserving heat for 7h, then heating to 890 +/-10 ℃ at a speed of 60-70 ℃/h, and preserving heat for 10.5 h; and after the heat preservation is finished, quickly cooling to 300-350 ℃, and preserving heat for 14 h.
Step 3), heating to 830 +/-10 ℃ at a speed of 60-70 ℃/h, and preserving heat for 10.5 h; cooling the furnace to 710 +/-10 ℃ at a speed of 10-20 ℃/h after the heat preservation is finished, and preserving the heat for 28 h; cooling the furnace to 650 +/-10 ℃ at a speed of 5-10 ℃/h after the heat preservation is finished, and preserving the heat for 28 h; and after the heat preservation is finished, furnace cooling is carried out at the speed of 20-30 ℃/h to 500 ℃, and then furnace cooling is carried out at the speed of 10-20 ℃/h to 150 ℃, and then furnace discharging and air cooling are carried out.
The Cr5 cold roll produced by the process has the advantages of no clutter after forging ultrasonic flaw detection, qualified flaw detection, actual grain size of 6 grades, mesh structure of 1.5 grades, spheroidized structure of 2.0 grades, no white point defects found in transverse low-power and longitudinal fractures.
Example 2: as shown in figure 1, the post-forging annealing process of the large-specification Cr5 cold roll has the specification of phi 915mm multiplied by 4830mm and comprises the following chemical components in percentage by mass: c: 0.82%, Si 0.68%, Mn 0.39%, Ni: 0.35%, Cr: 4.95%, Mo: 0.23%, V: 0.12 percent, and the balance of Fe and other inevitable impurities, and adopts an electroslag ingot.
Step 1), after forging, quickly cooling a forged piece to 350-400 ℃, heating to 600-650 ℃ at full power for waiting for material, preserving heat for 10h, then heating to 970 +/-10 ℃ at a speed of 50-60 ℃/h, and preserving heat for 14 h; and after the heat preservation is finished, quickly cooling to 350-400 ℃, and preserving heat for 18.5 h.
Step 2), heating to 600-650 ℃ at a speed of 50-60 ℃/h, preserving heat for 10h, heating to 890 +/-10 ℃ at a speed of 50-60 ℃/h, preserving heat for 14h, rapidly cooling to 300-350 ℃ after heat preservation, and preserving heat for 18.5 h.
And 3) heating to 830 +/-10 ℃ at a speed of 50-60 ℃/h, preserving heat for 14h, furnace cooling to 710 +/-10 ℃ at a speed of 10-20 ℃/h after heat preservation, preserving heat for 37h, furnace cooling to 650 +/-10 ℃ at a speed of 5-10 ℃/h after heat preservation, preserving heat for 92h, furnace cooling to 500 ℃ at a speed of 20-30 ℃/h after heat preservation, and then furnace cooling to 120 ℃ at a speed of 10-20 ℃/h, and discharging and air cooling.
The Cr5 cold roll produced by the process has the advantages of no clutter after forging ultrasonic flaw detection, qualified flaw detection, 5-grade actual grain size, 2.0-grade net structure, 3.0-grade spheroidized structure, and no white point defects in transverse low-power and longitudinal fractures.
Claims (7)
1. The post-forging annealing process of the large-specification Cr5 cold roll is characterized by comprising the following steps of: the process comprises the following specific steps:
step 1), after forging, quickly cooling a forging piece to 350-400 ℃, heating the forging piece to 600-650 ℃ at full power for waiting for material, keeping the temperature for 1h/100mm, then heating the forging piece to 960-1000 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1-2 h/100mm, quickly cooling the forging piece to 350-400 ℃ after heat preservation, and keeping the temperature for 1.5-2.5 h/100 mm;
step 2), heating to 600-650 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1h/100mm, then heating to 870-910 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1-2 h/100mm, rapidly cooling to 300-350 ℃ after the heat preservation is finished, and keeping the temperature for 1.5-2.5 h/100 mm;
and 3) heating to 800-850 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 1-2 h/100mm, cooling to 700-750 ℃ at a speed of less than or equal to 30 ℃/h after heat preservation, keeping the temperature for 3.5-4.5 h/100mm, cooling to 640-680 ℃ at a speed of less than or equal to 10 ℃/100mm after heat preservation, keeping the temperature for 4-10 h/100mm, cooling to 500 ℃ at a speed of less than or equal to 40 ℃/h after heat preservation, and cooling to 150 ℃ or less at a speed of less than or equal to 20 ℃/h.
2. The post-forging annealing process of large-specification Cr5 cold rolls of claim 1, wherein the rapid cooling in step 1) is interstitial water cooling and fog cooling.
3. The forging annealing process of the large-specification Cr5 cold roll according to claim 1, wherein in the step 1), when the temperature is raised to be less than or equal to 80 ℃/h, the optimal temperature rise is 970 +/-10 ℃, and the optimal heat preservation time is 1.5h/100 mm; and after the heat preservation is finished, quickly cooling to 350-400 ℃, wherein the optimal heat preservation time is 2h/100 mm.
4. The forging annealing process of the large-specification Cr5 cold roll according to claim 1, wherein in the step 2), when the temperature is raised for the second time at a rate of less than or equal to 80 ℃/h, the optimal temperature rise is 890 +/-10 ℃, the optimal heat preservation time is 1.5h/100mm, the temperature is rapidly cooled to 300-350 ℃ after the heat preservation is finished, and the optimal heat preservation time is 2h/100 mm.
5. The forging annealing process for the large-specification Cr5 cold roll according to claim 1, wherein in the step 3), when the temperature is raised to be less than or equal to 80 ℃/h, the optimal temperature rise is 830 +/-10 ℃; when the furnace cooling is carried out at a temperature of less than or equal to 30 ℃/h after the heat preservation is finished, the optimal furnace cooling temperature is 710 +/-10 ℃, and the optimal heat preservation time is 4h/100 mm; when the furnace cooling is carried out at the temperature of less than or equal to 10 ℃/100mm after the heat preservation is finished, the optimal furnace cooling temperature is 650 +/-10 ℃; after the heat preservation is finished, the furnace is cooled to 500 ℃ at the speed of less than or equal to 40 ℃/h, and then the furnace is cooled to less than or equal to 150 ℃ at the speed of less than or equal to 20 ℃/h, and the furnace is taken out for air cooling.
6. The post-forging annealing process of the large-specification Cr5 cold roll according to claim 1, wherein the Cr5 cold roll is steel for the cold roll, and the steel comprises 4.8-5.1% by mass of chromium, 0.78-0.90% by mass of carbon, 0.20-0.60% by mass of molybdenum and 0.10-0.20% by mass of vanadium.
7. The post-forging annealing process of the large-specification Cr5 cold roll according to claim 1, wherein the large-specification Cr5 cold roll is an electroslag ingot forging; the diameter of the cold roll body is between 700mm and 1000 mm.
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| CN202111045828.5A CN113832310A (en) | 2021-09-07 | 2021-09-07 | Post-forging annealing process of large-specification Cr5 cold roll |
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| CN202111045828.5A CN113832310A (en) | 2021-09-07 | 2021-09-07 | Post-forging annealing process of large-specification Cr5 cold roll |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417965A (en) * | 2011-11-22 | 2012-04-18 | 洛阳中创重型机械有限公司 | Post-forging heat treatment process for 45Cr4NiMoV alloy steel large back-up rolls of rolling mills |
| CN103014259A (en) * | 2012-12-29 | 2013-04-03 | 大冶特殊钢股份有限公司 | After-forging hydrogen diffusion and annealing method of forging material |
| CN103468889A (en) * | 2013-08-30 | 2013-12-25 | 马鞍山市晨旭机械制造有限公司 | After-forged heat treatment technique of 9Cr2MoV chilled roll steel |
| CN109047600A (en) * | 2018-09-20 | 2018-12-21 | 成都先进金属材料产业技术研究院有限公司 | The forging method of cold rolling roller stock |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417965A (en) * | 2011-11-22 | 2012-04-18 | 洛阳中创重型机械有限公司 | Post-forging heat treatment process for 45Cr4NiMoV alloy steel large back-up rolls of rolling mills |
| CN103014259A (en) * | 2012-12-29 | 2013-04-03 | 大冶特殊钢股份有限公司 | After-forging hydrogen diffusion and annealing method of forging material |
| CN103468889A (en) * | 2013-08-30 | 2013-12-25 | 马鞍山市晨旭机械制造有限公司 | After-forged heat treatment technique of 9Cr2MoV chilled roll steel |
| CN109047600A (en) * | 2018-09-20 | 2018-12-21 | 成都先进金属材料产业技术研究院有限公司 | The forging method of cold rolling roller stock |
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