CN111560563A - Production method of electroslag type hot-working die steel plate - Google Patents
Production method of electroslag type hot-working die steel plate Download PDFInfo
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Abstract
A method for producing an electroslag type hot-work die steel plate, which belongs to the technical field of metallurgy. The method comprises the working procedures of smelting, die casting, electroslag remelting, heating, rolling and annealing; in the smelting process, molten steel is smelted in an electric furnace, refined in an LF furnace and transferred into a VD furnace for vacuum treatment when the temperature reaches 1650 ℃; the molten steel comprises the following chemical components in percentage by mass: 0.30 to 0.43%, Si: 0.80-1.20%, Mn: 0.30-0.60%, P is less than or equal to 0.025%, S is less than or equal to 0.005%, Cr: 4.00-5.50%, Mo: 1.20-2.50%, V: 0.40-1.10%, Al: 0.015 to 0.045%, and the balance of Fe and inevitable impurities; the electroslag remelting process adopts a quinary slag system, and the average remelting speed is 16-25 kg/min. The invention adds the electroslag remelting process, and the performance of the rolled steel plate has better isotropy.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a production method of an electroslag type hot-working die steel plate.
Background
The hot-working die steel is suitable for making alloy tool steel for die for hot deformation processing of metal, is mainly used for making forging die, hot extrusion die, precision forging die with large impact load, aluminum, copper and alloy die-casting die thereof, and has the characteristics of high hardenability, excellent thermal cracking resistance, medium wear resistance, softening resistance at higher temperature, small heat treatment deformation, good processing performance and the like. After the electroslag remelting process, the steel has better service life and high fatigue resistance, and is widely applied in the market.
At present, common steel ingots and round ingot electroslag ingots are adopted in domestic electroslag type hot work die steel to produce steel plates through forging. The invention adopts the slab ingot electroslag ingot for production, the produced slab ingot electroslag ingot is rolled into a steel plate by a rolling mill, the maximum width of the steel plate reaches 2300mm, and the rolling instead of forging can be realized.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production method of an electroslag type hot-work die steel plate. The invention adopts the following technical scheme:
a production method of an electroslag type hot-work die steel plate comprises the working procedures of smelting, die casting, electroslag remelting, heating, rolling and annealing.
In the smelting process, molten steel is smelted in an electric furnace and refined in an LF furnace, and is transferred into a VD furnace for vacuum treatment when the temperature reaches 1650 ℃, the vacuum degree is less than or equal to 66.7Pa, and the vacuum retention time is more than or equal to 25 min; adding a CaSi block of more than or equal to 100 kg/furnace or a Fe-Ca line with the diameter of 0.5-3.0 cm of 50-200 m/furnace before vacuum treatment; the molten steel comprises the following chemical components in percentage by mass: c: 0.30 to 0.43%, Si: 0.80-1.20%, Mn: 0.30-0.60%, P is less than or equal to 0.025%, S is less than or equal to 0.005%, Cr: 4.00-5.50%, Mo: 1.20-2.50%, V: 0.40-1.10%, Al: 0.015 to 0.045%, and the balance of Fe and inevitable impurities.
In the die casting process, low-carbon covering slag is adopted, the steel ingot is cast and solidified in a die for 8 hours, then the die is removed, a slow cooling pit is arranged for slow cooling for 24 hours or more, and the casting temperature is 1530-1560 ℃.
The electroslag remelting process adopts a quinary slag system, the average remelting speed is 16-25 kg/min, and the quinary slag system comprises the following components in parts by weight: CaF2：Al2O3：CaO：SiO2：MgO=38～43 : 29～31 : 19～21 : 5～8 : 1～4。
In the heating procedure, the highest heating temperature is 1280 ℃, the soaking temperature is 1100-1260 ℃, the soaking time is more than or equal to 12 hours, and the total heating time is 30-58 hours.
In the rolling procedure, the heating temperature is 1100-1260 ℃, the initial rolling temperature is 1050-1100 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is not less than 880 ℃, the total rolling reduction rate is not less than 60%, and the strip temperature after rolling is timely and slowly cooled.
The annealing process adopts a two-stage annealing process, the first-stage annealing temperature is 860-890 ℃, the second-stage annealing temperature is 720-760 ℃, the furnace is discharged after being cooled to be less than or equal to 500 ℃, and the total in-furnace time is more than or equal to 24 hours.
The thickness of the steel plate is 160-420 mm, and the width is not more than 2300 mm.
The beneficial effect that adopts above-mentioned technical scheme to produce lies in: the invention adds the electroslag remelting process on the basis of the die casting of the steel ingot, thereby ensuring that the steel quality is purer, the structure is more compact, the performance of the rolled steel plate has better isotropy, and the steel plate has larger thickness specification and wider application.
The yield strength of the steel plate obtained by the invention is more than or equal to 320MPa, the tensile strength is more than or equal to 610MPa, the impact energy at 20 ℃ is more than or equal to 13.6J, the flaw detection of the steel plate meets the highest grade E/E grade of the forging ultrasonic flaw detection standard SEP1921, and each index of the inclusion grade A, B, C, D is less than 0.5.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The steel grade of the hot-work die steel plate is H13, the thickness of the steel plate is 420mm, the width of the steel plate is 1850mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 66.0Pa for 25min, and adding 100kg of CaSi blocks per furnace before vacuum; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon mold flux into a steel ingot mold, demolding after solidifying for 8 hours, then slowly cooling in a slow cooling pit for 24 hours, and casting at the temperature of 1539 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 22 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1260 ℃, the total heating time is 48 hours, and the soaking time is 20 hours;
(5) a rolling procedure: the heating temperature is 1240 ℃, the initial rolling temperature is 1050 ℃, the austenite recrystallization zone is rolled at low speed and high reduction, the final rolling temperature is 905 ℃, the total reduction rate is 70%, and the strip temperature after rolling is cooled slowly in time;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the annealing temperature of the first stage is 860 ℃, the annealing temperature of the second stage is 730 ℃, the steel plate is cooled to 500 ℃ and discharged from the furnace, and the total in-furnace time is 26 hours.
Through detection, the yield strength of the H13 finished steel plate is 320MPa, the tensile strength is 610MPa, the 20 ℃ impact energy is 42J, 45J and 41J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 2
The steel grade of the hot-work die steel plate is H13, the thickness of the steel plate is 180mm, the width of the steel plate is 2000mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 66.5Pa for 28min, and adding a Fe-Ca wire with the diameter of 0.8cm into the furnace before vacuum treatment, wherein the diameter of the Fe-Ca wire is 50 m/furnace; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon protective slag into a steel ingot mold, demolding after solidifying for 8 hours, then slowly cooling in a slow cooling pit for 24 hours, and casting at the temperature of 1557 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 23 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1240 ℃, the total heating time is 50 h, and the soaking time is 20 h;
(5) a rolling procedure: heating temperature is 1260 ℃, rolling temperature is 1060 ℃, austenite recrystallization zone is rolled at low speed and high pressure, finishing temperature is 900 ℃, total reduction rate is 90%, and strip temperature after rolling is timely and slowly cooled;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the annealing temperature of the first stage is 880 ℃, the annealing temperature of the second stage is 740 ℃, the steel plate is cooled to 500 ℃ and discharged from the furnace, and the total in-furnace time is 28 hours.
Through detection, the yield strength of the H13 finished steel plate is 409MPa, the tensile strength is 630MPa, the 20 ℃ impact energy is 55J, 54J and 51J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 3
The steel grade of the hot-work die steel plate is H11, the thickness of the steel plate is 380mm, the width of the steel plate is 1800mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 65.7Pa for 27.5min, and adding 100kg of CaSi blocks per furnace before vacuum; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon covering slag into a steel ingot mold, demolding after solidifying for 8 hours, then placing into a slow cooling pit for slow cooling for 25 hours, and casting at 1542 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 19 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1253 ℃, the total heating time is 40 hours, and the soaking time is 18 hours;
(5) a rolling procedure: the heating temperature is 1200 ℃, the initial rolling temperature is 1080 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is 890 ℃, the total rolling reduction rate is 75%, and the strip temperature after rolling is timely and slowly cooled;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the annealing temperature of the first stage is 890 ℃, the annealing temperature of the second stage is 760 ℃, the steel plate is discharged after being cooled to 500 ℃, and the total in-furnace time is 32 hours.
Through detection, the yield strength of the H11 finished steel plate is 360MPa, the tensile strength is 591MPa, the 20 ℃ impact energy is 45J, 44J and 47J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 4
The steel grade of the hot-work die steel plate is H11, the thickness of the steel plate is 250mm, the width of the steel plate is 1800mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 66.7Pa for 26min, and adding a Fe-Ca wire with the diameter of 0.5cm into the furnace before vacuum treatment, wherein the wire is 74 m/furnace; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon protective slag into a steel ingot mold, demolding after solidifying for 8 hours, then slowly cooling in a slow cooling pit for 26 hours, and casting at the temperature of 1555 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 25 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1260 ℃, the total heating time is 40 hours, and the soaking time is 17 hours;
(5) a rolling procedure: heating temperature is 1260 ℃, rolling temperature is 1100 ℃, austenite recrystallization zone is rolled at low speed and high pressure, finishing rolling temperature is 953 ℃, total rolling reduction rate is 80%, and strip temperature after rolling is timely and slowly cooled;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the annealing temperature of the first stage is 870 ℃, the annealing temperature of the second stage is 750 ℃, the steel plate is cooled to 500 ℃ in a furnace and taken out of the furnace, and the total in-furnace time is 35 hours.
Through detection, the yield strength of the H11 finished steel plate is 340MPa, the tensile strength is 625MPa, the 20 ℃ impact energy is 50J, 48J and 51J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 5
The steel grade of the hot-work die steel plate is H13, the thickness of the steel plate is 160mm, the width of the steel plate is 2300mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 65.3Pa for 27min, and adding a Fe-Ca wire with the diameter of 2.1cm into the furnace before vacuum treatment; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon mold flux into a steel ingot mold, demolding after solidifying for 8 hours, then slowly cooling in a slow cooling pit for 24.2 hours, and casting at the temperature of 1535 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 16 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1123 ℃, the total heating time is 36.1h, and the soaking time is 13.3 h;
(5) a rolling procedure: the heating temperature is 1145 ℃, the initial rolling temperature is 1061 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is 884 ℃, the total rolling reduction rate is 66%, and the strip temperature after rolling is timely and slowly cooled;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the annealing temperature of the first stage is 888 ℃, the annealing temperature of the second stage is 736 ℃, the steel plate is cooled to 477 ℃ and discharged from the furnace, and the total in-furnace time is 24 hours.
Through detection, the finished steel plate has yield strength of 348MPa, tensile strength of 702MPa, impact energy of 42J, 43J and 45J at 20 ℃, and mechanical property detection results show that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 6
The steel grade of the hot-work die steel plate is DIEVAR, the thickness of the steel plate is 334mm, the width of the steel plate is 2000mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 66.1Pa for 30min, and adding 106kg of CaSi blocks per furnace before vacuum; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon covering slag into a steel ingot mold, demolding after solidifying for 8 hours, then placing into a slow cooling pit for slow cooling for 28.5 hours, and casting at 1560 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 17.1 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1167 ℃, the total heating time is 31.5h, and the soaking time is 17.5 h;
(5) a rolling procedure: heating temperature is 1100 ℃, rolling temperature is 1087 ℃, austenite recrystallization zone is rolled at low speed and high pressure, finishing rolling temperature is 946 ℃, total rolling reduction rate is 71%, and the strip temperature after rolling is timely and slowly cooled;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the first-stage annealing temperature is 868 ℃, the second-stage annealing temperature is 755 ℃, the steel plate is cooled to 493 ℃ and discharged from the furnace, and the total in-furnace time is 30.3 hours.
Through detection, the yield strength of the finished steel plate is 390MPa, the tensile strength is 689MPa, the 20 ℃ impact energy is 39J, 40J and 41J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 7
The steel grade of the hot-work die steel plate is H13, the thickness of the steel plate is 185mm, the width of the steel plate is 2300mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 65.4Pa for 28.5min, and adding a Fe-Ca wire with the diameter of 1.4cm into the furnace before vacuum treatment, wherein the wire is 180 m/furnace; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon mold flux into a steel ingot mold, demolding after solidifying for 8 hours, then placing into a slow cooling pit for slow cooling for 25.3 hours, and casting at the temperature of 1533 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 20.2 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1100 ℃, the total heating time is 43.4 hours, and the soaking time is 15.6 hours;
(5) a rolling procedure: the heating temperature is 1125 ℃, the initial rolling temperature is 1095 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is 917 ℃, the total rolling reduction rate is 83%, and the strip temperature after rolling is timely and slowly cooled;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the annealing temperature of the first stage is 885 ℃, the annealing temperature of the second stage is 720 ℃, the steel plate is discharged after being cooled to 455 ℃, and the total in-furnace time is 25.1 h.
Through detection, the yield strength of the finished steel plate is 382MPa, the tensile strength is 703MPa, the 20 ℃ impact energy is 37J, 38J and 39J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical property. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 8
The steel grade of the hot-working die steel plate is DIEVAR, the thickness of the steel plate is 268mm, the width of the steel plate is 2200mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 65.5Pa for 25.5min, and adding a Fe-Ca wire with the diameter of 3cm into the furnace before vacuum treatment; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon covering slag into a steel ingot mold, demolding after solidifying for 8 hours, and then slowly cooling in a slow cooling pit for 27 hours at the casting temperature of 1530 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 24.4 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1144 ℃, the total heating time is 54.9 hours, and the soaking time is 12 hours;
(5) a rolling procedure: the heating temperature is 1152 ℃, the initial rolling temperature is 1069 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is 939 ℃, the total reduction rate is 88%, and the strip temperature is cooled slowly in time after rolling;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the first-stage annealing temperature is 881 ℃, the second-stage annealing temperature is 748 ℃, the furnace is cooled to 460 ℃, and the furnace discharge time is 29.4 hours.
Through detection, the finished steel plate of the embodiment has yield strength of 393MPa, tensile strength of 675MPa, 20 ℃ impact energy of 45J, 42J and 43J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 9
The steel grade of the hot-working die steel plate is DIEVAR, the thickness of the steel plate is 409mm, the width of the steel plate is 1800mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 65.0Pa for 25min, and adding 110kg of CaSi blocks per furnace before vacuum; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon protective slag into a steel ingot mold, demolding after solidifying for 8 hours, then slowly cooling in a slow cooling pit for 29.4 hours, and casting at the temperature of 1551 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 18.5 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1219 ℃, the total heating time is 30h, and the soaking time is 22 h;
(5) a rolling procedure: heating temperature of 1193 ℃, rolling temperature of 1074 ℃, rolling in austenite recrystallization zone at low speed and under high pressure, rolling temperature of 880 ℃, total rolling reduction rate of 62%, and timely slow cooling after rolling with temperature;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the first-stage annealing temperature is 875 ℃, the second-stage annealing temperature is 723 ℃, the furnace is cooled to 424 ℃, the steel plate is discharged, and the total in-furnace time is 27.5 h.
Through detection, the finished steel plate of the embodiment has the yield strength of 390MPa, the tensile strength of 698MPa and the 20 ℃ impact energy of 41J, 39J and 40J, and the mechanical property detection result shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Example 10
The steel grade of the hot-work die steel plate of the embodiment is DIEVAR, the thickness of the steel plate is 311mm, the width of the steel plate is 1950mm, and the production steps are as follows:
(1) smelting: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, transferring the molten steel into a VD furnace for vacuum degassing treatment when the temperature of the molten steel reaches 1650 ℃, keeping the vacuum degree at 64.8Pa for 32min, and adding a Fe-Ca wire with the diameter of 2.6cm into the furnace before vacuum treatment, wherein the diameter of the Fe-Ca wire is 200 m/furnace; the chemical components and the mass percentage of the molten steel are shown in the table 1;
(2) die casting process: casting low-carbon covering slag into a steel ingot mold, demolding after solidifying for 8 hours, and then slowly cooling in a slow cooling pit for 27.8 hours at a casting temperature of 1546 ℃;
(3) an electroslag remelting process: adopting a quinary slag system, wherein the average remelting speed is 16.6 kg/min; the components and the weight ratio of the five-element slag system are shown in the table 2;
(4) a heating procedure: the maximum heating temperature is 1280 ℃, the soaking temperature is 1194 ℃, the total heating time is 58 hours, and the soaking time is 15 hours;
(5) a rolling procedure: the heating temperature is 1177 ℃, the initial rolling temperature is 1054 ℃, the austenite recrystallization zone is rolled at low speed and high pressure, the final rolling temperature is 925 ℃, the total rolling reduction rate is 60%, and the strip temperature after rolling is timely cooled slowly;
(6) and (3) annealing: and (3) charging and annealing the rolled steel plate, and adopting a two-stage annealing process, wherein the first-stage annealing temperature is 862 ℃, the second-stage annealing temperature is 725 ℃, the steel plate is cooled to 485 ℃ and discharged from the furnace, and the total in-furnace time is 34.3 hours.
Through detection, the finished steel plate of the embodiment has yield strength of 375MPa, tensile strength of 687MPa, 20 ℃ impact energy of 39J, 37J and 38J, and the detection result of mechanical properties shows that the steel plate has good comprehensive mechanical properties. The flaw detection of the steel plate meets the highest level E/E of the forging ultrasonic flaw detection standard SEP1921, and all indexes of the inclusion rating A, B, C, D are less than 0.5.
Table 1. molten steel chemical compositions and mass% in the smelting process of each example
In table 1, the balance is Fe and inevitable impurities.
Table 2 shows the composition and weight ratio (%)
Claims (9)
1. A production method of an electroslag type hot work die steel plate is characterized by comprising the following steps: smelting, die casting, electroslag remelting, heating, rolling and annealing;
in the smelting process, molten steel is smelted by an electric furnace and refined by an LF furnace, the molten steel is transferred into a VD furnace for vacuum treatment when the temperature reaches 1650 ℃, and a CaSi block or an Fe-Ca wire is added before the vacuum treatment; the molten steel comprises the following chemical components in percentage by mass: c: 0.30 to 0.43%, Si: 0.80-1.20%, Mn: 0.30-0.60%, P is less than or equal to 0.025%, S is less than or equal to 0.005%, Cr: 4.00-5.50%, Mo: 1.20-2.50%, V: 0.40-1.10%, Al: 0.015 to 0.045%, and the balance of Fe and inevitable impurities;
the electroslag remelting process adopts a quinary slag system, and the average remelting speed is 16-25 kg/min.
2. The method for producing an electroslag type hot work die steel plate according to claim 1, wherein in the VD furnace vacuum treatment process, the degree of vacuum is less than or equal to 66.7Pa, and the vacuum holding time is more than or equal to 25 min.
3. The method for producing an electroslag type hot work die steel plate according to claim 2, wherein in the VD furnace vacuum treatment process, the amount of CaSi blocks added is not less than 100 kg/furnace; the linear diameter of Fe-Ca is 0.5-3.0 cm, and the addition amount is 50-200 m/furnace.
4. The method for producing an electroslag type hot work die steel plate according to claim 3, wherein in the die casting process, low-carbon mold powder is adopted, a cast steel ingot is solidified in a die for 8 hours, then is demoulded, is filled with a slow cooling pit and is slowly cooled for 24 hours or more, and the casting temperature is 1530-1560 ℃.
5. The method for producing an electroslag type hot work die steel plate according to claim 4, wherein in the electroslag remelting process, the five-element slag system comprises the following components in parts by weight: CaF2：Al2O3：CaO：SiO2：MgO=38～43 : 29～31 : 19～21 : 5～8 : 1～4。
6. The method for producing an electroslag type hot work die steel plate according to claim 5, wherein in the heating step, the maximum heating temperature is 1280 ℃, the soaking temperature is 1100-1260 ℃, the soaking time is not less than 12h, and the total heating time is 30-58 h.
7. The method for producing an electroslag type hot-work die steel plate according to any one of claim 6, wherein the rolling process is performed at a heating temperature of 1100-1260 ℃, a starting rolling temperature of 1050-1100 ℃, an austenite recrystallization zone is rolled at a low speed under a high pressure, a final rolling temperature is not less than 880 ℃, a total rolling reduction rate is not less than 60%, and the steel plate is slowly cooled in time with a temperature after rolling.
8. The method for producing an electroslag type hot work die steel plate according to any one of claims 1 to 7, wherein the annealing process adopts a two-stage annealing process, the first stage annealing temperature is 860 to 890 ℃, the second stage annealing temperature is 720 to 760 ℃, the steel plate is discharged after being cooled to 500 ℃ or less in a furnace, and the total in-furnace time is 24 hours or more.
9. The method for producing a steel plate for an electroslag type hot work die according to any one of claims 1 to 7, wherein the steel plate has a thickness of 160 to 420mm and a width of 2300mm or less.
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