CN115896594A - High-strength high-toughness H13 die steel for aluminum extrusion and preparation method thereof - Google Patents
High-strength high-toughness H13 die steel for aluminum extrusion and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000001125 extrusion Methods 0.000 title claims abstract description 41
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000005242 forging Methods 0.000 claims abstract description 66
- 238000010438 heat treatment Methods 0.000 claims abstract description 43
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 10
- 230000000737 periodic effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 29
- 238000000137 annealing Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 17
- 238000000265 homogenisation Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000005204 segregation Methods 0.000 abstract description 10
- 239000002245 particle Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 9
- 238000001192 hot extrusion Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
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- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The invention discloses a preparation method of high strength and toughness H13 die steel for aluminum extrusion, which comprises the steps of smelting molten steel according to a certain chemical component ratio; refining the smelted molten steel until the molten steel is smelted into an ingot; putting the ingot into a furnace for periodic temperature rise; carrying out fast forging on the cast ingot subjected to the staged heating, wherein the fast forging comprises sectional upsetting and drawing; carrying out precision forging on the fast-forged bar; the technology effectively reduces the banded segregation in the die steel, obviously reduces the size of generated carbide particles, obviously improves the roundness, further improves the strength and the toughness of the prepared die steel, and prolongs the service life of the die.
Description
Technical Field
The invention relates to the technical field of steel processing, in particular to high-strength and high-toughness H13 die steel for aluminum extrusion and a preparation method thereof.
Background
The hot extrusion is a novel hot processing mode widely popularized in recent years, and the application field is very wide. The hot extrusion die operates at a higher temperature than the forge hot die because of the longer contact time between the hot extrusion die and the metal being extruded. During backward extrusion or combined extrusion, the temperature of the die is higher than that of forward extrusion due to the fact that the die and a workpiece are in friction, and if particles such as oxide scales exist, the friction is increased. The higher the heating temperature of the metal being extruded, the higher the operating temperature of the hot extrusion die. The working conditions of hot extrusion are quite heavy, the hot extrusion punch bears huge pressure and tensile force during working and demoulding, the die also bears large pressure and tensile force and strong friction and thermal cycle stress, and residual tool marks or thick grinding marks are often the initiation sources of thermal fatigue cracks, so that the thermal fatigue process is accelerated. Therefore, limited to the specificity of the process, high temperature strength (high tempering resistance), sufficient thermal fatigue resistance, and high wear resistance are particularly required for such molds. However, the prior art has not met the preparation requirements for preparing the die steel for hot extrusion with high hardness, good impact resistance and good toughness.
In view of the above, it is particularly necessary to provide a method for preparing a high-strength and high-toughness H13 die steel for aluminum extrusion, which can meet the requirements of a hot extrusion process.
Disclosure of Invention
The invention aims to provide a preparation method of large-size high-strength and high-toughness H13 die steel for aluminum extrusion, which is used for effectively reducing the strip segregation in steel, improving the strength and toughness of the prepared die steel, improving the metallurgical quality of the die steel, further prolonging the service life of a die and improving the production efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of high-strength and high-toughness H13 die steel for aluminum extrusion comprises the following steps:
smelting molten steel according to a certain chemical component ratio;
refining the smelted molten steel until the molten steel is smelted into an ingot;
feeding the ingot into a furnace for periodic temperature rise;
carrying out fast forging on the cast ingot subjected to the staged heating, wherein the fast forging comprises sectional upsetting and drawing;
carrying out precision forging on the fast-forged bar;
and annealing the bar after the finish forging to prepare the high-strength high-toughness H13 die steel for aluminum extrusion.
As a further improvement of the present invention, the sectional upsetting-followed elongation includes: after the first upsetting and drawing, the homogenization treatment is performed, and then the second upsetting and drawing are performed.
As a further improvement of the invention, the smelting molten steel comprises the following chemical components in proportion: c:0.40-0.45%, si:0.97-1.2%, mn:0.37-0.42%, cr:5.0-5.3%, mo:1.3-1.5%, V:0.95-1%, nb:0.015-0.020% and Fe for the rest.
As a further improvement of the present invention, the temperature raising system of the stepwise temperature raising is: putting the ingot into a furnace when the temperature of the heating furnace before forging is ensured to be less than or equal to 650 ℃, and preserving heat for 6-8 hours; heating to 850 +/-10 ℃, and keeping the temperature for 2-4 h; then heating to 1280 +/-10 ℃, and preserving the heat for 5-7 h; then cooling to 1180 +/-10 ℃, and preserving the temperature for more than or equal to 1h.
As a further improvement of the invention, the diameter of the smelted cast ingot is 1500-1800mm.
As a further improvement of the present invention, the segmented post-upsetting elongation comprises: upsetting to phi 1000 + -50 mm, and drawing to phi 750 + -10 mm; then, the mixture is melted back to 1290-1310 ℃ for homogenization for 13-15 h, cooled to 1180 +/-10 ℃ and kept for more than or equal to 1h, then the mixture is upset to phi 600 +/-30 mm and drawn to phi 400 +/-5 mm.
As a further improvement of the present invention, the finish forging of the fast forged bar includes:
and (3) putting the fast forged bar into a furnace, preserving the heat at 1150 +/-10 ℃ for more than or equal to 2.5h, and then forging.
As a further improvement of the invention, the diameter of the high-strength and high-toughness H13 die steel for aluminum extrusion is 280 +/-10 mm.
As a further improvement of the present invention, the annealing the finish-forged bar includes:
keeping the temperature of the bar after the precision forging at 500 +/-10 ℃ for 6 h; heating to 860 +/-10 ℃ at the heating rate of less than or equal to 100 ℃/h, and keeping the temperature for 12h; then cooling to 750 +/-10 ℃ at a cooling rate of less than or equal to 30 ℃/h, and preserving heat for 15h; then cooling to 350 ℃ or below at a cooling rate of 30 ℃/h or below and discharging.
The invention also provides the high-strength and high-toughness H13 die steel for aluminum extrusion, and the high-strength and high-toughness H13 die steel for aluminum extrusion is prepared by any one of the preparation methods of the high-strength and high-toughness H13 die steel for aluminum extrusion.
The invention has the technical effects and advantages that:
the preparation method of the high-strength and high-toughness H13 die steel for aluminum extrusion provided by the invention comprises the following steps of smelting molten steel according to a certain chemical component ratio; refining the smelted molten steel until the molten steel is smelted into an ingot; feeding the ingot into a furnace for staged heating; carrying out fast forging on the cast ingot subjected to the staged heating, wherein the fast forging comprises sectional upsetting and drawing; carrying out precision forging on the fast-forged bar; the technology realizes the effective reduction of the banded segregation in the die steel, obviously reduces the size of generated carbide particles, obviously improves the roundness, improves the strength and the toughness of the prepared die steel, and prolongs the service life of the die.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a flow chart of a method for preparing high-toughness H13 die steel for aluminum extrusion according to the present invention;
FIG. 2 is a schematic diagram of the ingot heating schedule trend of the present invention;
FIG. 3 is a schematic view showing the temperature rising profile of an ingot in comparative example 1 of the present invention;
FIG. 4 is a schematic view showing the annealing schedule trend of the bar after the finish forging;
FIG. 5 is a schematic diagram showing the structural difference in carbide size between the high toughness H13 die steel for aluminum extrusion obtained in examples 1 to 3 of the present invention and comparative example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to solve the defects of the prior art, the invention provides a preparation method of large-size phi 280 +/-10 mm high-strength and high-toughness H13 die steel for aluminum extrusion, and successfully prepares a high-quality bar material for an aluminum extrusion die, which has high tempering resistance, high wear resistance, high strength and high toughness. Specifically, the invention is realized by the following technical scheme, which can be seen in fig. 1:
(1) Smelting according to the following chemical components in proportion: c:0.40-0.45%, si:0.97-1.2%, mn:0.37-0.42%, cr:5.0-5.3%, mo:1.3-1.5%, V:0.95-1%, nb:0.015-0.020% and Fe for the rest;
(2) Pouring the smelted molten steel to be used as an electrode bar, refining the electrode bar by using an electroslag remelting process, and finally smelting the electrode bar into a cast ingot with the diameter of 1500-1800 mm;
(3) When the temperature of the heating furnace before forging is ensured to be less than or equal to 650 ℃, the ingot is put into the furnace to be heated in a segmented way, and the heating system is shown in figure 2; firstly preserving the heat for 6-8 h after the ingot is put into the furnace; then heating to 850 +/-10 ℃ at the heating rate of 50 ℃/h, and then preserving the heat for 2-4 h; then raising the temperature to 1280 +/-10 ℃ at the heating rate of 90 ℃/h, preserving the temperature for 5-7 h, and carrying out first high-temperature homogenization treatment; then cooling to 1180 +/-10 ℃ at a cooling rate of 100 ℃/h, and then carrying out subsequent sectional forging after heat preservation is more than or equal to 1h.
(4) Quick forging (segmented forging process): firstly upsetting the cast ingot subjected to the staged heating treatment to the diameter phi of 1000 +/-50 mm, drawing the cast ingot to the diameter phi of 750 +/-10 mm (lightly chamfering), returning the cast ingot to the furnace for 1290-1310 ℃, homogenizing for 13-15 h, cooling to 1180 +/-10 ℃, and preserving the temperature for more than or equal to 1h; upsetting to phi 600 +/-30 mm, drawing to phi 400 +/-5 mm, cutting off a cap opening, and turning to finish forging;
(5) And (3) precision forging: the press red-turning blank is put into a furnace, is subjected to heat preservation at 1150 +/-10 ℃ for more than or equal to 2.5 hours, is forged, is controlled to be phi 280 +/-10 mm, and defects at two ends need to be cut off completely.
(6) Annealing: and (3) annealing and stress-relieving the bar after finish forging in an annealing furnace, wherein the schedule can be shown in figure 4: keeping the temperature of the bar after the precision forging at 500 +/-10 ℃ for 6 hours; heating to 860 +/-10 ℃ at the heating rate of less than or equal to 100 ℃/h, and keeping the temperature for 12h; then cooling to 750 +/-10 ℃ at a cooling rate of less than or equal to 30 ℃/h, and preserving heat for 15h; then cooling to 350 ℃ or below at a cooling rate of 30 ℃/H or below, and discharging to obtain the finished product of the high-strength and high-toughness H13 die steel for aluminum extrusion with the diameter phi of 280 +/-10 mm.
The invention has the beneficial effects that: by adopting the production process of the H13 die steel for aluminum extrusion, the hardness and toughness of the prepared die steel are effectively improved, the banded segregation is obviously reduced, the service life of the die is prolonged, and the production efficiency is further improved: specifically, the method adopts higher homogenization temperature to enable the carbide to achieve the solid solution effect, effectively reduces the size of the carbide and improves the roundness of the carbide, and can effectively avoid the material from cracking caused by stress concentration caused by sharp corners and shape diversity of the carbide. 2. Sectional type forging process can effectively keep the inside temperature of material in the forging process, avoids forging cracking that the blank temperature drops and leads to excessively low in the forging process, and 3, sectional type forging process cooperation secondary high temperature homogenization handles for also make the segregation size of carbide reach littleer level when the segregation degree of carbide drops to lower. The reason is that the carbide in the material is in a semi-solid solution state due to the higher homogenization temperature, the sharp angle and the reduced part size can be effectively removed, and the plasticity of the material is increased at high temperature, so that the forging process is more effective for crushing the carbide.
The following describes in detail the method for producing a high toughness H13 die steel for aluminum extrusion according to the present invention with reference to specific examples 1 to 3 and comparative example 1:
comparative example 1
(1) Smelting according to the following chemical components in proportion: c:0.43%, si:0.98%, mn:0.38 percent and Cr;5.12%, mo:1.42%, V:0.95 percent, nb0.020 percent and the balance of Fe.
(2) Pouring the smelted molten steel to be used as an electrode bar, refining the electrode bar by using an electroslag remelting process, and finally smelting the electrode bar into an ingot with the diameter of 1500-1800 mm;
(3) When the temperature of the heating furnace before forging is ensured to be less than or equal to 650 ℃, the ingot is put into the furnace to be heated in a segmented way, and the heating system is shown in figure 3: firstly preserving heat for 6-8 h after the ingot is put into the furnace; then heating to 850 +/-10 ℃ at the heating rate of 50 ℃/h, and then preserving the heat for 2-4 h; then, the temperature can be increased to 1200 +/-10 ℃ at the heating rate of 90 ℃/h, the temperature is kept for 5 to 7h, and the first high-temperature homogenization treatment is carried out; then, the temperature can be reduced to 1180 +/-10 ℃ at the temperature reduction rate of 100 ℃/h, and then the temperature is kept for 1h.
(4) Quick forging: upsetting to phi 700mm, drawing to phi 500mm (lightly chamfering), returning to the furnace, heating to 1180 ℃, preserving heat for 1h, cutting off a cap opening, and turning to finish forging;
(5) And (3) precision forging: the press red-turning blank is put into a furnace, is subjected to heat preservation at 1150 +/-10 ℃ for more than or equal to 2.5 hours, is forged, and is controlled to have a size phi of 280mm, and defects at two ends need to be cut completely.
(6) Annealing: after the finish forging, the blank is placed into an annealing furnace for annealing and stress removal treatment, and the schedule is shown in figure 4.
Example 1
The invention is realized by the following technical scheme:
(1) Smelting according to the following chemical components in proportion: c:0.43%, si:0.98%, mn:0.38%, cr:5.12%, mo:1.42%, V:0.95%, nb:0.020% and the balance Fe.
(2) Pouring the smelted molten steel to be used as an electrode bar, refining the electrode bar by using an electroslag remelting process, and finally smelting the electrode bar into a cast ingot with the diameter of 1500-1800 mm;
(3) When the temperature of the heating furnace before forging is ensured to be less than or equal to 650 ℃, the ingot is put into the furnace to be heated in a segmented way, and the heating system is shown in figure 2; firstly preserving heat for 6-8 h after the ingot is put into the furnace; then heating to 850 +/-10 ℃ at the heating rate of 50 ℃/h, and then preserving the heat for 2-4 h; then raising the temperature to 1280 +/-10 ℃ at the heating rate of 90 ℃/h, preserving the temperature for 5-7 h, and carrying out first high-temperature homogenization treatment; then, the temperature can be reduced to 1180 +/-10 ℃ at the temperature reduction rate of 100 ℃/h, and then the temperature is kept for 1h.
(4) Quick forging: upsetting to phi 700mm, drawing to phi 500mm (lightly chamfering), returning to the furnace, heating to 1180 ℃, keeping the temperature for 1h, cutting off a cap opening, and performing rotary precision forging;
(5) And (3) precision forging: the press red-turning blank is put into a furnace, is subjected to heat preservation at 1150 +/-10 ℃ for more than or equal to 2.5 hours, is forged, and is controlled to have a size phi of 280mm, and defects at two ends need to be cut completely.
(6) Annealing: after the finish forging, the blank is put into an annealing furnace for annealing and stress removing treatment, and the schedule is shown as figure 4.
Example 2
The invention is realized by the following technical scheme:
(1) Smelting according to the following chemical components in proportion: c:0.43%, si:0.98%, mn:0.38%, cr:5.12%, mo:1.42%, V:0.95%, nb:0.020% and the balance Fe;
(2) Pouring the smelted molten steel to be used as an electrode bar, refining the electrode bar by using an electroslag remelting process, and finally smelting the electrode bar into a cast ingot with the diameter of 1500-1800 mm;
(3) When the temperature of the heating furnace before forging is ensured to be less than or equal to 650 ℃, the ingot is put into the furnace to be heated in a segmented way, and the heating system is shown in figure 2; the procedure is as in example 1.
(4) Quick forging: upsetting to phi 1000mm, drawing to phi 750mm (lightly chamfering), heating the material to 1180 ℃ after returning, and keeping the temperature for 1h; upsetting to phi 600mm, drawing to phi 400mm, cutting off the cap opening, and turning to precision forging;
(5) And (3) precision forging: the press red-turning blank is put into a furnace, is subjected to heat preservation at 1150 +/-10 ℃ for more than or equal to 2.5 hours, is forged, and is controlled to have a size phi of 280mm, and defects at two ends need to be cut completely.
(6) Annealing: after the finish forging, the blank is put into an annealing furnace for annealing and stress removing treatment, and the schedule is shown as figure 4.
Example 3
The invention is realized by the following technical scheme:
(1) Smelting according to the following chemical components in proportion: c:0.43%, si:0.98%, mn:0.38%, cr:5.12%, mo:1.42%, V:0.95%, nb:0.020% and Fe for the rest;
(2) Pouring the smelted molten steel to be used as an electrode bar, refining the electrode bar by using an electroslag remelting process, and finally smelting the electrode bar into a cast ingot with the diameter of 1500-1800 mm;
(3) When the temperature of the heating furnace before forging is ensured to be less than or equal to 650 ℃, the ingot is put into the furnace to be heated in a segmented way, and the heating system is shown in figure 2; the procedure is as in example 1.
(4) Quick forging: upsetting to phi 1000mm, drawing to phi 750mm (lightly chamfering), returning to the furnace, homogenizing at 1290 ℃ for 14h, cooling to 1180 ℃, and preserving heat for 1h; upsetting to phi 600mm, drawing to phi 400mm, cutting off the cap opening, and turning to precision forging;
(5) And (3) precision forging: the press red-turning blank is put into a furnace, is forged after the temperature is kept at 1150 +/-10 ℃ for more than or equal to 2.5 hours, and is controlled to have a size phi of 280mm, and defects at two ends need to be cut off completely.
(6) Annealing: after the finish forging, the blank is placed into an annealing furnace for annealing and stress removal treatment, and the schedule is shown in figure 4.
Test example 1
In the test example, the high-toughness H13 die steel products for aluminum extrusion prepared in examples 1 to 3 and comparative example 1 were respectively characterized by carbide strip segregation and mechanical properties, and the results are shown in fig. 5 and table 1 below. After observing the high-strength and high-toughness H13 die steel finished product for aluminum extrusion prepared in the comparative example 1, the carbides in the finished product have obvious sharp corners and shape diversity and have larger particle size, so that the tensile strength, yield strength, reduction of area, no impact notch, hardness and the like of the prepared bar are all at lower levels compared with the examples 1 to 3. In example 1, the higher homogenization temperature is adopted, so that the carbide can achieve a certain solid solution effect, the particle size of the generated carbide is reduced to a certain extent, and the roundness is improved, as shown in fig. 5. In addition, embodiment 2 further adopts the sectional type forging mode, can effectively keep the internal temperature of the material in the forging process, avoids forging cracking caused by too low temperature drop of the blank in the forging process, further reduces the generation size of the carbide and improves the generation roundness of the carbide. Further, in example 3, because a secondary high-temperature homogenization treatment process is introduced between the sectional forging processes, the segregation degree of the carbide is reduced to a lower level, and the segregation size of the carbide also reaches a smaller level. Therefore, compared with the H13 die steel prepared in the comparative example 1 in the prior art, the high-strength and high-toughness H13 die steel for aluminum extrusion prepared in the example 3 is remarkably improved in the aspects of tensile strength, yield strength, elongation after fracture, reduction of area, no impact notch, hardness and the like. Therefore, the method provided by the invention realizes the preparation of higher-quality H13 die steel for aluminum extrusion with high hardness, good impact resistance and good toughness by properly increasing the homogenization temperature and adopting a secondary high-temperature homogenization treatment process introduced between sectional forging processes.
TABLE 1 characterization of mechanical Properties of H13 die steels of examples 1-3 and comparative example 1
| Tensile strength Rm | Yield strength Rp0.2 | Elongation after fracture A | Reduction of area Z | Ak without impact gap | Hardness HRC | |
| Comparative example 1 | 1514 | 1297 | 9.3 | 29.7 | 263 | 45.97 |
| Example 1 | 1623 | 1392 | 9.3 | 39.3 | 320 | 47.22 |
| Example 2 | 1595 | 1371 | 11 | 37.3 | 317 | 46.48 |
| Example 3 | 1755 | 1497 | 8.8 | 31.3 | 363 | 49.80 |
In conclusion, according to the preparation method of the high-strength and high-toughness H13 die steel for aluminum extrusion, molten steel is smelted according to a certain chemical component ratio; refining the smelted molten steel until the molten steel is smelted into an ingot; putting the ingot into a furnace for periodic temperature rise; carrying out fast forging on the cast ingot subjected to the staged heating, wherein the fast forging comprises sectional upsetting and drawing; carrying out precision forging on the fast-forged bar; the technology realizes the effective reduction of banded segregation in the die steel, obviously reduces the size of generated carbide particles, obviously improves the roundness, improves the strength and the toughness of the prepared die steel, and prolongs the service life of the die.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of high-strength and high-toughness H13 die steel for aluminum extrusion is characterized by comprising the following steps:
smelting molten steel according to a certain chemical component ratio;
refining the smelted molten steel until the molten steel is smelted into an ingot;
feeding the ingot into a furnace for periodic temperature rise;
carrying out fast forging on the cast ingot subjected to the staged heating, wherein the fast forging comprises drawing out after sectional upsetting;
carrying out precision forging on the fast-forged bar;
and annealing the bar after the finish forging to prepare the high-strength high-toughness H13 die steel for aluminum extrusion.
2. The method of producing a high-toughness H13 die steel for aluminum extrusion as recited in claim 1,
the sectional upsetting post-elongation comprises: after the first upsetting and drawing, the homogenization treatment is performed, and then the second upsetting and drawing are performed.
3. The method for producing a high-toughness H13 die steel for aluminum extrusion as claimed in claim 1,
the smelting molten steel comprises the following chemical components in percentage by weight: c:0.40-0.45%, si:0.97-1.2%, mn:0.37-0.42%, cr:5.0-5.3%, mo:1.3-1.5%, V:0.95-1%, nb:0.015-0.020% and Fe for the rest.
4. The method for producing a high-toughness H13 die steel for aluminum extrusion as claimed in claim 1 or 2,
the temperature rising system of the stage temperature rising is as follows: putting the ingot into a furnace when the temperature of the heating furnace before forging is ensured to be less than or equal to 650 ℃, and preserving heat for 6-8 hours; heating to 850 +/-10 ℃, and keeping the temperature for 2-4 h; then heating to 1280 +/-10 ℃, and preserving the heat for 5-7 h; then the temperature is reduced to 1180 +/-10 ℃, and the temperature is kept for more than or equal to 1h.
5. The method for producing a high-toughness H13 die steel for aluminum extrusion as claimed in claim 1,
the diameter of the smelted cast ingot is 1500-1800mm.
6. The method for producing a high-toughness H13 die steel for aluminum extrusion as claimed in claim 5,
the sectional upsetting post-elongation comprises: upsetting to phi 1000 + -50 mm, and drawing to phi 750 + -10 mm; then, the mixture is melted back to 1290-1310 ℃ for homogenization for 13-15 h, cooled to 1180 +/-10 ℃ and kept for more than or equal to 1h, then the mixture is upset to phi 600 +/-30 mm and drawn to phi 400 +/-5 mm.
7. The method for preparing the high-toughness H13 die steel for aluminum extrusion according to claim 1, wherein the finish forging of the rapidly forged bar comprises:
and (3) putting the fast forged bar into a furnace, preserving the heat at 1150 +/-10 ℃ for more than or equal to 2.5h, and then forging.
8. The method for producing a high-toughness H13 die steel for aluminum extrusion as claimed in claim 7,
the diameter of the high-strength and high-toughness H13 die steel for aluminum extrusion is 280 +/-10 mm.
9. The method for preparing the high-strength and high-toughness H13 die steel for aluminum extrusion according to claim 1, wherein the annealing of the finish-forged bar comprises:
keeping the temperature of the bar after the precision forging at 500 +/-10 ℃ for 6 h; heating to 860 +/-10 ℃ at the heating rate of less than or equal to 100 ℃/h, and keeping the temperature for 12h; then cooling to 750 +/-10 ℃ at a cooling rate of less than or equal to 30 ℃/h, and preserving heat for 15h; then cooling to 350 ℃ or below at a cooling rate of 30 ℃/h or below and discharging.
10. A high strength and toughness H13 die steel for aluminum extrusion is characterized in that,
the high-strength high-toughness H13 die steel for aluminum extrusion is prepared by the preparation method of any one of claims 1 to 9.
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| CN202211401056.9A CN115896594B (en) | 2022-11-09 | High-strength and high-toughness H13 die steel for aluminum extrusion and preparation method thereof |
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