CN116716542A - Heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and preparation process thereof - Google Patents
Heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and preparation process thereof Download PDFInfo
- Publication number
- CN116716542A CN116716542A CN202310695109.0A CN202310695109A CN116716542A CN 116716542 A CN116716542 A CN 116716542A CN 202310695109 A CN202310695109 A CN 202310695109A CN 116716542 A CN116716542 A CN 116716542A
- Authority
- CN
- China
- Prior art keywords
- equal
- furnace
- percent
- slag
- die steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 77
- 239000010959 steel Substances 0.000 title claims abstract description 77
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 230000007797 corrosion Effects 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000005242 forging Methods 0.000 claims abstract description 44
- 238000003723 Smelting Methods 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims abstract description 8
- 238000000265 homogenisation Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 3
- 239000002893 slag Substances 0.000 claims description 77
- 238000001816 cooling Methods 0.000 claims description 42
- 238000010438 heat treatment Methods 0.000 claims description 31
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 239000000843 powder Substances 0.000 claims description 28
- 238000010079 rubber tapping Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 22
- 238000000137 annealing Methods 0.000 claims description 21
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 229910008455 Si—Ca Inorganic materials 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 7
- 239000010436 fluorite Substances 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000010583 slow cooling Methods 0.000 claims description 7
- 230000003009 desulfurizing effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 239000000047 product Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- 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
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and a preparation process thereof, and belongs to the technical field of die steel preparation. The plastic die steel provided by the invention comprises the following elements in percentage by weight: c:0.20 to 0.25 percent of Mn:0.50 to 1.00 percent of Si: less than or equal to 0.50 percent, S: less than or equal to 0.003 percent, P: less than or equal to 0.024 percent, cr: 12.00-13.50%, mo:0.50 to 1.00 percent of V:0.20 to 0.30 percent of N:0.02 to 0.05 percent of Ni:0.30 to 1.00 percent of W:0.30 to 0.80 percent and the balance of iron. The preparation method comprises the following steps: firstly, adopting a non-vacuum induction furnace, an LF furnace and a VD furnace to carry out primary smelting, then adopting a common electroslag furnace to carry out secondary remelting to obtain a uniform steel ingot with high purity, finally, carrying out high-temperature homogenization and forging to obtain a phi 200 round bar with uniform structure and excellent strength and toughness, wherein after the round bar is quenched at the temperature of 850 ℃ and 1040 ℃ and tempered and quenched twice at the temperature of 250 ℃, the impact of a notch can be up to 310J, the quenched and tempered hardness reaches 49HRC, and the plastic die steel is also excellent in heat resistance and corrosion resistance.
Description
Technical Field
The invention relates to a preparation method of plastic die steel, belongs to the technical field of die steel materials, and in particular relates to a preparation process of heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel, which is a die steel material for bottle blank dies.
Background
The level of the technology of mold production has become an important sign for measuring the level of the production level of a national product, because the mold determines the quality, benefit and development capability of a new product to a great extent. The "mold is the basic process equipment for industrial production" has also gained consensus.
In products such as electronics, automobiles, motors, electric appliances, instruments, meters, home appliances, communication and the like, 60 to 80% of parts are formed by means of a mold. The high precision, high complexity, high consistency, high productivity and low consumption of the production of the parts by the mould are not comparable to those of other processing and manufacturing methods. The mould is also a benefit amplifier, and the value of the end product produced by the mould is often tens of times and hundreds of times of the value of the mould.
Compared with international advanced levels such as America, japanese, fabry-Perot and the like, the high-end die steel in China has a certain gap, and is difficult to meet market demands in aspects such as variety, quality, dimension specification and performance, so that the basic research of the die steel and the attack of production process must be enhanced, and the quality and performance level of the domestic die steel are improved.
The traditional plastic die steel cannot meet the high quality requirements of complex structure, high dimensional accuracy, high corrosion resistance, high polishing rate and the like. Particularly, for the plastic die steel for high-grade bottle blanks, the current production capacity is limited, the product quality is uneven, and the heat resistance and corrosion resistance of the material still need to be further improved; meanwhile, the impact property of the existing plastic die steel is low, and the hardness is required to be improved. Therefore, development of new technology, new technology and new variety of high-end die steel is imperative.
How to provide a preparation process of plastic die steel with good heat resistance and corrosion resistance, higher impact performance and high hardness, which is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the problems, thereby providing the heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and the preparation process thereof, and meeting the use requirements in the field of high-end plastic die steel products. The technical aim of the invention is to provide the plastic die steel with good heat resistance and corrosion resistance, higher impact performance and high hardness and the preparation process thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention firstly provides a preparation process of heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel, which comprises the following elements in percentage by weight:
c:0.20 to 0.25 percent of Mn:0.50 to 1.00 percent of Si: less than or equal to 0.50 percent, S: less than or equal to 0.003 percent, P: less than or equal to 0.024 percent, cr: 12.00-13.50%, mo:0.50 to 1.00 percent of V:0.20 to 0.30 percent of N:0.02 to 0.05 percent of Ni:0.30 to 1.00 percent of W:0.30 to 0.80 percent and the balance of iron;
the preparation method comprises the following steps:
preparing alloy according to the element component proportion, smelting molten steel until homogenization, adding slag in the smelting process for deoxidizing and desulfurizing at 1550-1570 ℃, removing slag after the slag is removed, adding slag again for slagging, adding Al powder for diffusion deoxidization, tapping when the temperature is increased to be more than or equal to 1640 ℃, and entering an LF furnace;
step B, adjusting argon blowing flow and pressure after the seat bag is put into an LF station, adding lime and fluorite to adjust slag, and keeping the pressure at 0.2-0.7 MPa; heating to 1570-1590 ℃, and adding Si-Ca powder and Al powder to start reduction after slag is melted uniformly; sampling and fully analyzing the white slag, adding Al powder to maintain a reducing atmosphere, and keeping the white slag for more than or equal to 30min; regulating components according to a sampling result, adding a deoxidizer, maintaining a reducing atmosphere, heating to 1660-1690 ℃ to remove slag to 40-60%, tapping into a VD station;
the total evacuating time of the C, VD furnace is more than or equal to 15min, the ultimate vacuum is less than or equal to 133Pa, the holding time is more than or equal to 10min, the baked N-Cr is added after the evacuating, the static argon blowing is more than or equal to 8min, the temperature is measured to be 1555-1565 ℃, and tapping and pouring are carried out;
step D, placing the electrode rod cast in the step C as an electrode in an electroslag remelting furnace for secondary remelting purification to form an electroslag ingot;
step E, placing the steel ingot treated in the step D into a heating furnace, heating to 1250 ℃ at a speed of less than or equal to 200 ℃/h, preserving heat for 12 hours, and then discharging from the furnace for forging;
and F, performing air cooling to 300 ℃ after forging, performing air cooling or slow cooling to 120-200 ℃ and then performing furnace annealing in time, and performing surface polishing after annealing to obtain the required material.
The preparation method provided by the invention comprises the steps of refining the LF steel ladle, vacuum degassing the VD furnace, remelting the steel material by a common electroslag furnace for the second time to ensure that the purity of the die steel material reaches a higher state, heating the steel material by a high-temperature homogenizing heating method, and finally forging the steel material by a 2000T press to improve the uniformity of a metallographic structure of the material.
The die steel material produced by the invention can reach 310J without notch impact after being preheated, quenched at 850 ℃ +1040 ℃ and tempered at 250 ℃ for two times, the quenched and tempered hardness reaches 49HRC, and the heat resistance and the corrosion resistance are excellent.
Preferably, in the step A, the molten steel smelting is performed in a 20T non-vacuum induction furnace.
Preferably, in the step A, 20-40kg of aluminum ingots are added into a steel ladle before tapping, and slag is formed by mixing and flushing with a 3T furnace.
Preferably, in the step B, the J-Al wire is fed for 50-200m according to the Al condition in the furnace before the LF furnace is hung.
Preferably, in step D, 75 is used # The pre-melted slag is filled for more than or equal to 30min.
Preferably, in the step D, after the electroslag remelting is finished, the furnace cooling is performed for more than or equal to 30 minutes, and the cooling time is more than or equal to 36 hours.
Preferably, in the step E, the total forging ratio of forging is more than or equal to 5, the forging temperature is more than or equal to 1000 ℃, and the final forging temperature is more than or equal to 800 ℃.
Preferably, in the step F, the annealing temperature is 600-750 ℃, the heat preservation time is more than or equal to 30 hours, and the furnace cooling is carried out at the speed of less than or equal to 30 ℃/h to 500 ℃, and the furnace is taken out for air cooling.
The second purpose of the invention is to provide the heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel obtained by the preparation process.
Specifically, the plastic die steel has a notch-free impact of 310J and a quenched and tempered hardness of 49HRC.
The beneficial effects of the invention are as follows:
(1) The heat-resistant corrosion-resistant high-toughness plastic die steel material prepared by the method has uniform structure, good heat resistance and corrosion resistance and good toughness. After the die steel material is subjected to quenching at 850 ℃ plus 1040 ℃ and tempering at 250 ℃ twice, the notch-free impact can reach 310J, the tempering hardness reaches 49HRC, and the heat resistance and the corrosion resistance are excellent;
(2) The die steel material produced by the method has good economic and social benefits in the high-end plastic die steel market, and is suitable for popularization and application.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A preparation process of heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel,
the elemental composition (in weight percent) of the plastic die steel is shown in the following table 1, except iron:
TABLE 1
The preparation method comprises the following steps:
preparing alloy according to the element component proportion, smelting molten steel until homogenization, adding slag in the smelting process for deoxidizing and desulfurizing at 1550-1570 ℃, removing slag after the slag is removed, adding slag again for slagging, adding Al powder for diffusion deoxidization, tapping when the temperature is increased to be more than or equal to 1640 ℃, and entering an LF furnace;
step B, adjusting argon blowing flow and pressure after the seat bag is put into an LF station, adding lime and fluorite to adjust slag, and keeping the pressure at 0.2-0.7 MPa; heating to 1570-1590 ℃, and adding Si-Ca powder and Al powder to start reduction after slag is melted uniformly; sampling and fully analyzing the white slag, adding Al powder to maintain a reducing atmosphere, and keeping the white slag for more than or equal to 30min; regulating components according to a sampling result, adding a deoxidizer, maintaining a reducing atmosphere, heating to 1660-1690 ℃ to remove slag to 40-60%, tapping into a VD station;
the total evacuating time of the C, VD furnace is more than or equal to 15min, the ultimate vacuum is less than or equal to 133Pa, the holding time is more than or equal to 10min, the baked N-Cr is added after the evacuating, the static argon blowing is more than or equal to 8min, the temperature is measured to be 1555-1565 ℃, and tapping and pouring are carried out;
step D, placing the electrode rod cast in the step C as an electrode in an electroslag remelting furnace for secondary remelting purification to form an electroslag ingot;
step E, placing the steel ingot treated in the step D into a heating furnace, heating to 1250 ℃ at a speed of less than or equal to 200 ℃/h, preserving heat for 12 hours, and then discharging from the furnace for forging;
and F, performing air cooling to 300 ℃ after forging, performing air cooling or slow cooling to 120-200 ℃ and then performing furnace annealing in time, and performing surface polishing after annealing to obtain the required material.
Preferably, in the step A, the molten steel smelting is performed in a 20T non-vacuum induction furnace.
Preferably, in the step A, 20-40kg of aluminum ingots are added into a steel ladle before tapping, and slag is formed by mixing and flushing with a 3T furnace.
Preferably, in the step B, the J-Al wire is fed for 50-200m according to the Al condition in the furnace before the LF furnace is hung.
Preferably, in step D, 75 is used # The pre-melted slag is filled for more than or equal to 30min.
Preferably, in the step D, after the electroslag remelting is finished, the furnace cooling is performed for more than or equal to 30 minutes, and the cooling time is more than or equal to 36 hours.
Preferably, in the step E, the total forging ratio of forging is more than or equal to 5, the forging temperature is more than or equal to 1000 ℃, and the final forging temperature is more than or equal to 800 ℃.
Preferably, in the step F, the annealing temperature is 600-750 ℃, the heat preservation time is more than or equal to 30 hours, and the furnace cooling is carried out at the speed of less than or equal to 30 ℃/h to 500 ℃, and the furnace is taken out for air cooling.
Example 2
Sample 1 was taken according to table 1 and the preparation of plastic die steel was carried out as follows:
preparing alloy according to the element component proportion, smelting molten steel until homogenization, wherein the smelting temperature is 1550 ℃ in a 20T non-vacuum induction furnace, adding slag in the smelting process for deoxidization and desulfurization, removing slag after the slag is removed by 80%, adding slag again for slagging, adding Al powder for diffusion deoxidization, tapping when the temperature is up to 1640 ℃, adding 20kg of aluminum ingot into a ladle before tapping, mixing and flushing to form slag by using a 3T furnace, and entering an LF furnace;
b, adjusting argon blowing flow and pressure after the seat bag is put into an LF station, adding lime and fluorite to adjust slag, and keeping the pressure at 0.2MPa; heating to 1570-1 ℃, and adding Si-Ca powder and Al powder to start reduction after slag is melted uniformly; sampling and fully analyzing the white slag, adding Al powder to maintain a reducing atmosphere, and keeping the white slag for 30min; feeding a J-Al wire 50m according to the Al condition in the furnace before the ladle is hung in the LF furnace; regulating components according to the sampling result, adding deoxidizing agent, maintaining the reducing atmosphere, heating to 1660 ℃ to remove slag to 40%, tapping, and entering a VD station;
step C, VD furnace total evacuating time is 15min, extreme vacuum is 133Pa, holding time is 10min, baked N-Cr is added after the evacuating, argon is statically blown for 8min, and tapping and pouring are carried out at the temperature of 1555 ℃;
step D, placing the electrode rod cast in the step C as an electrode in an electroslag remelting furnace for secondary remelting purification to form an electroslag ingot; use 75 # Pre-slag, filling for 30min, cooling after furnace cooling for 30min, and cooling for 36h;
step E, placing the steel ingot treated in the step D into a heating furnace, heating to 1250 ℃ at 200 ℃/h, preserving heat for 12 hours, and then discharging and forging; the total forging ratio of forging is more than or equal to 5, the forging temperature is 1000 ℃, and the final forging temperature is 800 ℃;
and F, performing air cooling to 300 ℃ after forging, or performing slow cooling to 120 ℃ after air cooling, and then performing furnace annealing in time, wherein the annealing temperature is 600 ℃, the heat preservation time is 30 hours, and discharging and air cooling from a furnace at the speed of 30 ℃/h to 500 ℃, and performing surface polishing after annealing is finished to obtain the required material.
Example 3
Sample 2 was taken according to table 1 and the preparation of plastic die steel was carried out as follows:
preparing alloy according to the element component proportion, smelting molten steel to be uniform, wherein the smelting temperature is 1570 ℃ in a 20T non-vacuum induction furnace, adding slag in the smelting process to deoxidize and desulphurize, removing slag after the slag is removed, removing slag by 88%, adding slag again to form slag, adding Al powder to perform diffusion deoxidation, tapping when the temperature is 1650 ℃, adding 40kg of aluminum ingot into a ladle before tapping, mixing and flushing to form slag by using a 3T furnace, and entering an LF furnace;
b, adjusting argon blowing flow and pressure after the seat bag is put into an LF station, adding lime and fluorite to adjust slag, and keeping the pressure at 0.7MPa; heating to 1590 ℃, and adding Si-Ca powder and Al powder to start reduction after slag is melted uniformly; sampling and fully analyzing the white slag, adding Al powder to maintain a reducing atmosphere, and keeping the white slag for 36min; feeding a J-Al wire 200m according to the Al condition in the furnace before the ladle is hung in the LF furnace; regulating components according to the sampling result, adding deoxidizing agent, maintaining the reducing atmosphere, heating to 1690 ℃ to remove slag to 60%, tapping into a VD station;
step C, VD furnace total evacuating time is 20min, the holding time is 130Pa, the holding time is 15min, baked N-Cr is added after the evacuating, argon is statically blown for 12min, and the temperature is measured to 1565 ℃ for tapping and casting;
step D, placing the electrode rod cast in the step C as an electrode in an electroslag remelting furnace for secondary remelting purification to form an electroslag ingot; use 75 # Pre-slag, filling for 38min, cooling after furnace cooling for 35min, and cooling for 40h;
step E, placing the steel ingot treated in the step D into a heating furnace, heating to 1250 ℃ at 180 ℃/h, preserving heat for 12 hours, and then discharging and forging; the total forging ratio of forging is more than or equal to 5, the forging temperature is 1020 ℃, and the final forging temperature is 820 ℃;
and F, performing air cooling to 300 ℃ after forging, or performing slow cooling to 200 ℃ after air cooling, and then performing furnace annealing in time, wherein the annealing temperature is 750 ℃, the heat preservation time is 33 hours, and performing furnace cooling to 500 ℃ at 25 ℃/h, discharging and air cooling, and performing surface polishing after annealing is finished to obtain the required material.
Example 4
Sample 3 was taken according to table 1 and the preparation of plastic die steel was carried out as follows:
preparing alloy according to the element component proportion, smelting molten steel until homogenization, wherein the smelting temperature is 1560 ℃ in a 20T non-vacuum induction furnace, adding slag in the smelting process for deoxidization and desulfurization, removing slag after the slag is removed by 82%, adding slag again for slagging, adding Al powder for diffusion deoxidization, tapping when the temperature is raised to 1650 ℃, adding 30kg of aluminum ingot into a ladle before tapping, mixing and flushing with a 3T furnace for slagging, and entering an LF furnace;
b, adjusting argon blowing flow and pressure after the seat bag is put into an LF station, adding lime and fluorite to adjust slag, and keeping the pressure at 0.4MPa; heating to 1580 ℃, and adding Si-Ca powder and Al powder to start reduction after slag is melted uniformly; sampling and fully analyzing the white slag, adding Al powder to maintain a reducing atmosphere, and keeping the white slag for 34min; feeding a J-Al wire 150m according to the Al condition in the furnace before the ladle is hung in the LF furnace; regulating components according to the sampling result, adding deoxidizing agent, maintaining the reducing atmosphere, heating to 1680 ℃ to remove slag to 50%, tapping into a VD station;
step C, VD furnace total evacuating time is 16min, extreme vacuum is 131Pa, holding time is 12min, baked N-Cr is added after the evacuating, argon is statically blown for 10min, and tapping and pouring are carried out at 1560 ℃ in a temperature measuring mode;
step D, placing the electrode rod cast in the step C as an electrode in an electroslag remelting furnace for secondary remelting purification to form an electroslag ingot; use 75 # Pre-slag, filling for 32min, cooling after furnace cooling for 32min, and cooling for 38h;
step E, placing the steel ingot treated in the step D into a heating furnace, heating to 1250 ℃ at 190 ℃/h, preserving heat for 12 hours, and then discharging and forging; the total forging ratio of forging is more than or equal to 5, the forging temperature is 1030 ℃, and the final forging temperature is 850 ℃;
and F, performing air cooling to 300 ℃ after forging, or performing slow cooling to 180 ℃ and then performing furnace annealing in time, wherein the annealing temperature is 700 ℃, the heat preservation time is 33 hours, and performing furnace cooling to 500 ℃ at 25 ℃/h, discharging and air cooling, and performing surface polishing after annealing is finished to obtain the required material.
Example 5
Sample 4 was taken according to table 1 and the preparation of plastic die steel was carried out as follows:
preparing alloy according to the element component proportion, smelting molten steel until homogenization, wherein the smelting temperature is 1555 ℃ in a 20T non-vacuum induction furnace, adding slag in the smelting process for deoxidization and desulfurization, removing slag after the slag is removed, removing slag by 86%, adding slag again for slagging, adding Al powder for diffusion deoxidization, tapping when the temperature is higher than or equal to 1648 ℃, adding 25kg of aluminum ingot into a steel ladle before tapping, mixing and flushing with a 3T furnace for slagging, and entering an LF furnace;
b, adjusting argon blowing flow and pressure after the seat bag is put into an LF station, adding lime and fluorite to adjust slag, and keeping the pressure at 0.4MPa; heating to 1575 ℃, and adding Si-Ca powder and Al powder to start reduction after slag is melted uniformly; sampling and fully analyzing the white slag, adding Al powder to maintain a reducing atmosphere, and keeping the white slag for 36min; feeding a J-Al wire 150m according to the Al condition in the furnace before the ladle is hung in the LF furnace; regulating components according to the sampling result, adding deoxidizing agent, maintaining the reducing atmosphere, heating to 1670 ℃, deslagging to 45%, tapping into a VD station;
step C, VD furnace total evacuating time is 20min, the holding time is 130Pa, the holding time is 16min, baked N-Cr is added after the evacuating, argon is statically blown for 12min, and tapping and pouring are carried out at 1562 ℃ in a temperature measuring mode;
step D, placing the electrode rod cast in the step C as an electrode in an electroslag remelting furnace for secondary remelting purification to form an electroslag ingot; use 75 # Pre-slag, filling for 35min, cooling after furnace cooling for 35min, and cooling for 38h;
step E, placing the steel ingot treated in the step D into a heating furnace, heating to 1250 ℃ at 175 ℃/h, preserving heat for 12 hours, and then discharging and forging; the total forging ratio of forging is more than or equal to 5, the forging temperature is 1030 ℃, and the final forging temperature is 810 ℃;
and F, performing air cooling to 300 ℃ after forging, or performing slow cooling to 140 ℃ and then performing furnace annealing in time, wherein the annealing temperature is 650 ℃, the heat preservation time is 32h, and performing furnace cooling to 500 ℃ at a speed of 28 ℃/h, discharging and air cooling, and performing surface polishing after annealing is finished to obtain the required material.
Experimental example
The plastic die steel prepared in the above examples 2 to 5 of the present invention was subjected to performance test, and the results were as follows:
the die steel material prepared by the method has uniform structure, higher purity, good heat resistance and corrosion resistance and excellent toughness, is subjected to LF ladle refining and VD furnace vacuum degassing, is subjected to secondary remelting by a common electroslag furnace, reaches a higher purity state, is heated by a high-temperature homogenizing heating method, and is forged by a 2000T press to improve the uniformity of the metallographic structure of the material and reduce banding and reticulation. After the die steel material produced by the invention is quenched and tempered at 850 ℃ +1040 ℃ and tempered at 250 ℃ twice, the transverse notch impact reaches 310J, 312J, 315J and 320J respectively, the quenched and tempered hardness reaches 49HRC, 50HRC, 52HRC and 55HRC respectively, and the heat resistance and the corrosion resistance are excellent.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate technical solution, and this description is provided for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the embodiments may be combined appropriately to form other ways that will be understood by those skilled in the art.
Claims (10)
1. The preparation process of the heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel is characterized by comprising the following elements in percentage by weight:
c:0.20 to 0.25 percent of Mn:0.50 to 1.00 percent of Si: less than or equal to 0.50 percent, S: less than or equal to 0.003 percent, P: less than or equal to 0.024 percent, cr: 12.00-13.50%, mo:0.50 to 1.00 percent of V:0.20 to 0.30 percent of N:0.02 to 0.05 percent of Ni:0.30 to 1.00 percent of W:0.30 to 0.80 percent and the balance of iron;
the preparation process of the plastic die steel comprises the following steps:
preparing alloy according to the element component proportion, smelting molten steel until homogenization, adding slag in the smelting process for deoxidizing and desulfurizing at 1550-1570 ℃, removing slag after the slag is removed, adding slag again for slagging, adding Al powder for diffusion deoxidization, tapping when the temperature is increased to be more than or equal to 1640 ℃, and entering an LF furnace;
step B, adjusting argon blowing flow and pressure after the seat bag is put into an LF station, adding lime and fluorite to adjust slag, and keeping the pressure at 0.2-0.7 MPa; heating to 1570-1590 ℃, and adding Si-Ca powder and Al powder to start reduction after slag is melted uniformly; sampling and fully analyzing the white slag, adding Al powder to maintain a reducing atmosphere, and keeping the white slag for more than or equal to 30min; regulating components according to a sampling result, adding a deoxidizer, maintaining a reducing atmosphere, heating to 1660-1690 ℃ to remove slag to 40-60%, tapping into a VD station;
the total evacuating time of the C, VD furnace is more than or equal to 15min, the ultimate vacuum is less than or equal to 133Pa, the holding time is more than or equal to 10min, the baked N-Cr is added after the evacuating, the static argon blowing is more than or equal to 8min, the temperature is measured to be 1555-1565 ℃, and tapping and pouring are carried out;
step D, placing the electrode rod cast in the step C as an electrode in an electroslag remelting furnace for secondary remelting purification to form an electroslag ingot;
step E, placing the steel ingot treated in the step D into a heating furnace, heating to 1250 ℃ at a speed of less than or equal to 200 ℃/h, preserving heat for 12 hours, and then discharging from the furnace for forging;
and F, performing air cooling to 300 ℃ after forging, performing air cooling or slow cooling to 120-200 ℃ and then performing furnace annealing in time, and performing surface polishing after annealing to obtain the required material.
2. The process for preparing heat-resistant corrosion-resistant high-toughness plastic die steel according to claim 1, wherein in the step A, the molten steel is melted in a 20T non-vacuum induction furnace.
3. The process for preparing the heat-resistant corrosion-resistant high-toughness plastic die steel according to claim 1, wherein in the step A, 20-40kg of aluminum ingots are added into a steel ladle before tapping, and slag is formed by mixing and flushing with a 3T furnace.
4. The process for preparing the heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel according to claim 1, wherein in the step B, the J-Al wire is fed by 50-200m according to the Al condition in an LF furnace before the ladle is hung.
5. The process for preparing heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel according to claim 1, wherein in the step D, 75 is used # The pre-melted slag is filled for more than or equal to 30min.
6. The process for preparing the heat-resistant corrosion-resistant high-toughness plastic die steel according to claim 1, wherein in the step D, after the electroslag remelting is finished, the furnace cooling is performed for more than or equal to 30 minutes, and the cooling time is more than or equal to 36 hours.
7. The process for preparing the heat-resistant corrosion-resistant high-toughness plastic die steel according to claim 1, wherein in the step E, the total forging ratio requirement of forging is more than or equal to 5, the forging temperature is more than or equal to 1000 ℃, and the final forging temperature is more than or equal to 800 ℃.
8. The process for preparing the heat-resistant corrosion-resistant high-toughness plastic die steel according to claim 1, wherein in the step F, the annealing temperature is 600-750 ℃, the heat preservation time is more than or equal to 30 hours, and the heat preservation time is less than or equal to 30 ℃/h, and the heat preservation time is cooled to 500 ℃ in a furnace way and is discharged for air cooling.
9. A heat-resistant corrosion-resistant high-toughness plastic die steel obtained by the preparation process according to any one of claims 1 to 8.
10. The heat and corrosion resistant high strength and toughness plastic die steel according to claim 9, wherein said plastic die steel has a free-of-notch impact of 310J and a quenched and tempered hardness of 49HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310695109.0A CN116716542A (en) | 2023-06-13 | 2023-06-13 | Heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310695109.0A CN116716542A (en) | 2023-06-13 | 2023-06-13 | Heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116716542A true CN116716542A (en) | 2023-09-08 |
Family
ID=87865630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310695109.0A Pending CN116716542A (en) | 2023-06-13 | 2023-06-13 | Heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116716542A (en) |
-
2023
- 2023-06-13 CN CN202310695109.0A patent/CN116716542A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101328522B (en) | Smelting production method of low activation martensitic steel for fusion reactor | |
| CN109266970A (en) | High-nitrogen, high-chromium plastic die steel and its smelting and heat treatment method | |
| CN112359283B (en) | Manufacturing process of super-grade high-quality die-casting die steel forging module | |
| CN114540699B (en) | High-performance hot-work die steel and preparation method thereof | |
| CN109207856B (en) | Nitrogenous plastic die flat steel and production method thereof | |
| CN109468544B (en) | High-carbon high-chromium cold-work die steel and preparation method thereof | |
| CN112795843A (en) | Hot work die steel and preparation method thereof | |
| CN110964990A (en) | High-performance large-diameter thick-wall austenitic stainless steel forged pipe for nuclear power and short-process preparation method thereof | |
| CN114540703B (en) | High-toughness, high-polishing-property and corrosion-resistant plastic die steel and preparation method thereof | |
| CN109371332A (en) | A kind of 16MnCrS5 pinion steel and its production method | |
| CN114438394B (en) | Production process of pre-hardened high-polishing plastic mold steel | |
| CN107779775B (en) | H13 high-speed precision forging die steel and steel ingot production method | |
| CN103526121A (en) | Anti-scratching mandrel material | |
| CN102965589B (en) | Mechanical expanding machine pull rod shaft with high fatigue strength and preparation method thereof | |
| CN115896634B (en) | High-temperature-resistant nonferrous metal die-casting forming die steel material and preparation method thereof | |
| CN116716542A (en) | Heat-resistant corrosion-resistant high-strength and high-toughness plastic die steel and preparation process thereof | |
| CN110565009A (en) | Alloyed pre-hardened plastic die steel and preparation method thereof | |
| CN108570599A (en) | A kind of high-strength high hard narrow quenching degree oil 4145H steel ingots and its production method | |
| CN113604742A (en) | Corrosion-resistant plastic die steel flat steel with high pre-hardening hardness and excellent cutting processing performance and manufacturing method thereof | |
| CN113604730A (en) | High-temperature-resistant and high-toughness hot-work die steel and production process thereof | |
| CN118241123A (en) | Steel for hot forming die and preparation process thereof | |
| CN114959463B (en) | Martensitic stainless steel spindle with high impact performance and production method thereof | |
| CN115747671B (en) | Preparation method of cold-work die steel | |
| CN115852261B (en) | Mirror plastic die steel with uniform section hardness and manufacturing method thereof | |
| CN116426837A (en) | High-strength high-toughness corrosion-resistant plastic die steel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |