CN114438416A - Cr-Mo-V-N alloy material for bottle blank mold and preparation method thereof - Google Patents
Cr-Mo-V-N alloy material for bottle blank mold and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 23
- 229910001199 N alloy Inorganic materials 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 18
- 238000007670 refining Methods 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000005242 forging Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000000265 homogenisation Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000009849 vacuum degassing Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 abstract description 23
- 239000004033 plastic Substances 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 18
- 238000005336 cracking Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000009863 impact test Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052729 chemical element Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910001214 P-type tool steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention provides a Cr-Mo-V-N alloy material for a bottle blank mold and a preparation method thereof, belonging to the technical field of mold steel preparation. According to the bottle blank mold, the required raw materials comprise the following elements in percentage by weight: 0.15-0.30%; cr: 13.00-15.00%; mo: 0.80-1.30%; ni: 0.20 to 1.00 percent; n: 0.04-0.15%; v: 0.20-0.35%; mn: 0.20 to 1.00 percent, and the balance being Fe and impurities. The Cr-Mo-V-N alloy material for the bottle blank mold has the characteristics of high strength, high corrosion resistance and high polishing property, the impact toughness of the Cr-Mo-V-N alloy material is greatly improved, the performance stability of different batches of mold materials is excellent, and products of different batches have no difference basically; the plastic die steel has extremely low cracking degree and basically has no damage in the preparation process.
Description
Technical Field
The invention belongs to the technical field of plastic die steel, and particularly relates to a Cr-Mo-V-N alloy material for a bottle blank die and a preparation method thereof.
Background
The die steel is used for manufacturing dies such as a hot forging die, a cold stamping die, a die-casting die and the like, and the plastic die steel is used for manufacturing plastics. The traditional plastic die steel is often added with some alloy elements in the production process to improve the performance of the plastic die steel so as to meet the performance requirements of the plastic die steel under different working environments, thus leading the element composition of the plastic die steel to be more and more diversified, and the stability of the produced die steel in different batches is poorer.
With the development of the domestic mold market, the requirements on the strength, the corrosion resistance, the polishing performance, particularly the toughness and the like of the plastic mold are higher and higher, and meanwhile, the requirements on the stability of different batches of performance of mold materials are higher.
At present, the market of domestic high-end plastic die steel is occupied by imported high-price products, and in order to get rid of the difficult situation that domestic key die materials are limited by import for a long time, the comprehensive properties of the existing plastic die materials 1.2316(3Cr17NiMo) and S136(4Cr13 series products) can not meet the requirements of the use environment of the domestic plastic die at present, and particularly the problem of die cracking can not be effectively solved all the time.
Therefore, how to find a new preparation process, remarkably improve the comprehensive performance of the plastic die steel, particularly the improvement of the impact toughness, ensure the stability of the performance of die materials in different batches, and solve the problem of die cracking becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a Cr-Mo-V-N alloy material for a bottle blank mold and a preparation method thereof. The invention aims to solve the problems of poor comprehensive performance, particularly low impact toughness of the existing plastic die steel; secondly, the problem of poor performance stability of the existing plastic die steel in different batches of die materials is solved; thirdly, solve the problem that current plastic mold steel is easy to ftracture.
One of the purposes of the invention is to provide a preparation method of a Cr-Mo-V-N alloy material for a bottle blank mold, which comprises the following steps:
(1) taking the following raw materials C of required elements in percentage by weight: 0.15-0.30%; cr: 13.00-15.00%; mo: 0.80-1.30%; ni: 0.20 to 1.00 percent; n: 0.04-0.15%; v: 0.20-0.35%; mn: 0.20-1.00%, and the balance of Fe and impurities; primarily smelting in a non-vacuum induction furnace at 1520-1620 ℃, then refining by using a ladle at 1560-1650 ℃, and then vacuum degassing and refining to obtain molten steel and casting the molten steel into a consumable electrode;
(2) remelting and refining the consumable electrode in a protective atmosphere electroslag furnace to prepare an electroslag remelting ingot;
(3) carrying out high-temperature homogenization on the electroslag remelting ingot;
(4) forging or rolling and deforming the homogenized steel ingot to prepare a steel bar, wherein the total forging ratio is more than or equal to 7;
(5) and (3) carrying out refining pre-heat treatment on the steel bar obtained in the step (4), wherein the step of the refining pre-heat treatment comprises the following steps: heating the steel bar to 700 +/-50 ℃, preserving heat for more than 5 hours, heating to 980 +/-20 ℃, preserving heat for more than 2 hours, rapidly cooling, heating to 720-750 ℃, preserving heat for more than 20 hours, cooling to 400 ℃, and taking out of the furnace for air cooling; and then preparing a finished product to obtain the product.
The preparation method provided by the invention fully considers the characteristics of the use environment of the bottle blank mold: the method comprises the steps of optimizing the component proportion of an alloy material according to comprehensive factors influencing the ductility, toughness and fracture toughness of the material, and designing an LF furnace and a VD furnace to reduce the content of hydrogen and oxygen in molten steel, thereby solving the problem of high content of hydrogen and oxygen in a material matrix. The oxygen content in the molten steel is further reduced and purified by an LF furnace, a VD furnace and a protective atmosphere electroslag remelting process, and meanwhile, the solidification crystal structure of a steel ingot is improved by a protective atmosphere electroslag gradual reduction constant melting speed technology, so that the purity of steel is improved, and the segregation of dendrites is reduced. More importantly, the invention finally solves the problem of poor toughness of the material by high-temperature homogenization technology and pre-heat treatment refinement, and greatly prolongs the service life of the material by the comprehensive measures. The obtained finished product is detected to have the H content less than or equal to 1.5ppm, the O content less than or equal to 20ppm, the sum of 4 items of the most serious visual fields of various inclusions less than or equal to 3.0, and the comprehensive mechanical property (particularly the impact toughness) far exceeds that of similar products.
The invention not only well keeps the characteristics of high strength, high corrosion resistance and high polishing property of the Cr-Mo-V-N alloy material for the bottle blank mold, but also greatly improves the impact toughness, and the performance stability of different batches of mold materials is excellent, and products in different batches have no difference basically; meanwhile, the plastic die steel has extremely low cracking degree, 500 times of sample preparation is completed, the cracking degree (obviously cracking on the surface of the sample) is only 0.2 percent, basically no damage is caused, foreign technology blockages are broken, and the plastic die steel can well replace the existing products (such as S136 and 1.2316).
Further, the impurities in the step (1) comprise, by weight: less than or equal to 0.50 percent of Si, less than or equal to 0.006 percent of S, less than or equal to 0.025 percent of P and less than or equal to 0.20 percent of Cu.
And (3) further, performing surface polishing treatment on the steel bar obtained in the step (5), eliminating surface defects, and enabling the size, shape and surface quality of the steel bar to meet design requirements to obtain the finished bright steel bar.
Further, the vacuum degree of the vacuum degassing refining in the step (1) is less than or equal to 133 Pa.
Further, the protective atmosphere in the step (2) is N2The electroslag remelting slag system comprises the following components: CaF2:Al2O3:MgO＝75:20:5。
Further, the temperature of the high-temperature homogenization treatment in the step (3) is more than or equal to 1200 ℃.
The invention also aims to provide the Cr-Mo-V-N alloy material for the bottle blank mold prepared by the method.
Specifically, the Cr-Mo-V-N alloy material for the bottle blank mold comprises the following elements in percentage by weight: c: 0.15-0.30%; cr: 13.00-15.00%; mo: 0.80-1.30%; ni: 0.20 to 1.00 percent; n: 0.04-0.15%; v: 0.20-0.35%; mn: 0.20 to 1.00 percent; si is less than or equal to 0.50 percent; s is less than or equal to 0.006 percent; p is less than or equal to 0.025 percent; cu is less than or equal to 0.20 percent, and the balance is Fe.
The Cr-Mo-V-N alloy material for the bottle blank mold has the room-temperature tensile property: tensile strength Rm≥1000N/mm2Yield strength RP0.2≥850N/mm2Elongation A4 is more than or equal to 16%, reduction of area Z is more than or equal to 56%, impact energy AKvThe hardness is not less than 26J/cm2, and the hardness is HB 290-330; the room temperature unnotched impact properties were:quenching hardness HRC: 48-52, hardening and tempering hardness HRC: 47-52, and the unnotched impact value is more than or equal to 405J/cm2。
The sample heat treatment steps and the process parameters of the invention are as follows:
1) room temperature tensile, "V" notch impact
Quenching: heating temperature is more than or equal to 1030 ℃, time is 40 minutes, and cooling mode is as follows: cooling with oil;
tempering: heating temperature is more than or equal to 690 ℃, time is 120 minutes, and cooling mode is as follows: and air cooling.
The tensile and impact test requirements at room temperature of the test sample are as follows:
tensile strength Rm≥1000N/mm2；
Yield strength RP0.2≥850N/mm2；
Elongation A4≥16％；
The reduction of area Z is more than or equal to 56 percent;
impact energy AKv≥26J/cm2；
The hardness HR is 29-35.
2) Impact without gap at room temperature
Quenching: heating temperature is more than or equal to 1030 ℃, time is 40 minutes, and cooling mode is as follows: cooling with oil;
tempering: heating at 200-400 ℃ for 120 minutes, and cooling: air cooling (tempering cycle twice).
The room temperature unnotched impact test of the test specimens requires the following:
quenching hardness HRC: 48 to 52;
hardening and tempering hardness HRC: 47-52;
the unnotched impact value is more than or equal to 405J/cm2。
The invention has the following beneficial effects:
(1) the Cr-Mo-V-N alloy material for the bottle blank mold has the characteristics of high strength, high corrosion resistance and high polishing property, the impact toughness of the Cr-Mo-V-N alloy material is greatly improved, the performance stability of different batches of mold materials is excellent, and products of different batches have no difference basically; the plastic die steel has extremely low cracking degree, and basically has no damage in the preparation process;
(2) the plastic die steel provided by the invention has the advantages that the H content is less than or equal to 1.5ppm, the O content is less than or equal to 20ppm, the sum of 4 items of the most serious fields of various inclusions is less than or equal to 3.0, and the comprehensive mechanical properties (particularly the impact toughness) are far superior to those of similar products;
(3) the Cr-Mo-V-N alloy material for the bottle blank mold provided by the invention has the room-temperature tensile property as follows: tensile strength Rm≥1000N/mm2Yield strength RP0.2≥850N/mm2Elongation A4 is more than or equal to 16%, reduction of area Z is more than or equal to 56%, impact energy AKv≥26J/cm2Hardness HBC 29-35; the room temperature unnotched impact properties were: quenching hardness HRC: 48-52, hardening and tempering hardness HRC: 47-52, and the unnotched impact value is more than or equal to 405J/cm2The plastic die steel made of the material can meet the use requirements of a plastic die with high strength, high toughness and high corrosion resistance under the working condition of 200-400 ℃.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail with reference to the following embodiments, it should be noted that the following embodiments are only for explaining and illustrating the present invention and are not intended to limit the present invention. The invention is not limited to the above embodiments, but may be modified within the scope of the invention.
Examples
Firstly, (1) taking required chemical elements, smelting in a non-vacuum induction furnace, a ladle refining furnace and a vacuum degassing circuit, and adjusting the content of the chemical elements in the smelting process to ensure that the weight percentage of the chemical elements is as follows 1:
table 1 examples each elemental composition
| C％ | Cr％ | Ni％ | Mo％ | V％ | Mn％ | N％ | |
| Example 1 | 0.19 | 13.30 | 0.80 | 0.85 | 0.25 | 0.55 | 0.06 |
| Example 2 | 0.21 | 13.10 | 0.75 | 0.80 | 0.24 | 0.60 | 0.062 |
| Example 3 | 0.20 | 13.45 | 0.85 | 0.81 | 0.26 | 0.65 | 0.064 |
Controlling the content of impurity elements to be as low as possible, and pouring the solution into a consumable electrode;
(2) remelting and refining the consumable electrode in an electroslag furnace, wherein the electroslag remelting slag system comprises the following components: CaF2:Al2O3MgO is 75:20:5, and the content of impurity elements is further reduced to meet the following requirements:
si is less than or equal to 0.50 percent (weight percentage), S is less than or equal to 0.005 percent (weight percentage),
p is less than or equal to 0.025 percent (weight percentage), and Cu is less than or equal to 0.15 percent (weight percentage);
sampling and analyzing the qualified content of each component to prepare the electroslag ingot.
Secondly, the electroslag ingot is made into a steel bar, and the method comprises the following steps:
1) heating and forging or rolling the electroslag ingot into a steel bar;
2) after the steel bar is forged, the steel bar is subjected to refining and preheating treatment, and the steps and the process parameters are as follows:
heating the steel bar to 700 +/-50 ℃, preserving heat for more than or equal to 5 hours, then heating to 980 +/-20 ℃, preserving heat for more than or equal to 2 hours, then quickly cooling, then heating to 720-750 ℃, preserving heat for more than or equal to 20 hours, then cooling to 400 ℃, discharging and air cooling.
3) Performing surface treatment on the steel bar, namely performing surface polishing/milling treatment on the finished steel bar to eliminate surface defects and enable the size, shape and surface quality of the steel bar to meet design requirements to prepare a finished bright steel bar;
4) and (4) sampling and testing the mechanical property on the finished steel bar/flat steel, and performing room-temperature tensile, hardness and impact tests.
The sample heat treatment steps and process parameters are as follows:
1) room temperature tensile, "V" notch impact
Quenching: heating temperature is more than or equal to 1030 ℃, time is 40 minutes, and cooling mode is as follows: cooling with oil;
tempering: heating temperature is more than or equal to 690 ℃, time is 120 minutes, and cooling mode is as follows: and air cooling.
The technical requirements of the tensile and impact test at room temperature of the sample are as follows:
2) impact without gap at room temperature
Quenching: heating temperature is more than or equal to 1030 ℃, time is 40 minutes, and cooling mode is as follows: cooling with oil;
tempering: heating at 200-400 ℃ for 120 minutes, and cooling: air cooling (tempering cycle twice).
The technical requirements of the room-temperature impact test of the sample are as follows:
impact energy AKv≥280J/cm2
Hardness HRC 47-52
Test example 1
The room temperature mechanical properties (tensile, impact) of the materials manufactured in the above embodiments are shown in tables 2 and 3 below, and it can be seen from the experimental data in tables 2 and 3 that the steel material for plastic dies manufactured by the method has high strength, high toughness, high corrosion resistance and high polishing performance, compared with S136(4Cr13 series) and 1.2316(3Cr17NiMo), the impact toughness is effectively improved on the premise of ensuring the strength performance, the difference of longitudinal and transverse toughness performance is greatly reduced, and the use requirements of users are met. The results of the plastic die steel material prepared by the material and the corresponding process method after stretching and impacting at room temperature show that the mechanical properties completely meet the design requirements, and the test results are as follows:
TABLE 2 tensile Properties at room temperature, "V" -notch impact toughness
TABLE 3 tensile Properties at room temperature, unnotched impact toughness
Test example 2
When the bottle blank mold steel is prepared according to the method of the above example, taking the element composition of example 1 as an example, 100 times of preparation of different batches of bottle blank mold steel is completed, and the performance stability of each batch of mold material is found to be excellent, and products of each batch have no difference basically.
According to the element composition of the example 2, the production of 500 bottle blank mold samples was completed according to the method of the example, the cracking product was evaluated as cracking which is clearly visible on the surface of the sample, the good product was evaluated as cracking which is difficult to be seen with naked eyes, the statistical cracking degree was 0.2%, 499 pieces of the 500 samples were not damaged, and the cracking degree was extremely low.
Claims (9)
1. A preparation method of a Cr-Mo-V-N alloy material for a bottle blank mold is characterized by comprising the following steps:
(1) taking the following raw materials C of required elements in percentage by weight: 0.15-0.30%; cr: 13.00-15.00%; mo: 0.80-1.30%; ni: 0.20 to 1.00 percent; n: 0.04-0.15%; v: 0.20-0.35%; mn: 0.20-1.00%, and the balance of Fe and impurities; primarily smelting in a non-vacuum induction furnace at 1520-1620 ℃, then refining by using a ladle at 1560-1650 ℃, and then vacuum degassing and refining to obtain molten steel and casting the molten steel into a consumable electrode;
(2) remelting and refining the consumable electrode in a protective atmosphere electroslag furnace to prepare an electroslag remelting ingot;
(3) carrying out high-temperature homogenization on the electroslag remelting ingot;
(4) forging or rolling and deforming the homogenized steel ingot to prepare a steel bar, wherein the total forging ratio is more than or equal to 7;
(5) and (3) carrying out refining pre-heat treatment on the steel bar obtained in the step (4), wherein the step of the refining pre-heat treatment comprises the following steps: heating the steel bar to 700 +/-50 ℃, preserving heat for more than 5 hours, heating to 980 +/-20 ℃, preserving heat for more than 2 hours, rapidly cooling, heating to 720-750 ℃, preserving heat for more than 20 hours, cooling to 400 ℃, and taking out of the furnace for air cooling; and then preparing a finished product to obtain the product.
2. The method according to claim 1, wherein the impurities in step (1) comprise, in weight percent: less than or equal to 0.50 percent of Si, less than or equal to 0.006 percent of S, less than or equal to 0.025 percent of P and less than or equal to 0.20 percent of Cu.
3. The preparation method according to claim 1 or 2, characterized in that the steel bar obtained in the step (5) is subjected to surface polishing treatment to eliminate surface defects and to make the size, shape and surface quality of the steel bar meet design requirements, so as to obtain a finished bright steel bar.
4. The method according to claim 1, wherein the vacuum degree of the vacuum degassing refining in the step (1) is less than or equal to 133 Pa.
5. The method according to claim 1, wherein the protective atmosphere in the step (2) is N2The electroslag remelting slag system comprises the following components: CaF2:Al2O3:MgO＝75:20:5。
6. The method according to claim 1, wherein the temperature of the high-temperature homogenization treatment in the step (3) is 1200 ℃ or more.
7. The Cr-Mo-V-N alloy material for bottle blank molds, which is prepared by the method of any one of claims 1 to 6.
8. The Cr-Mo-V-N alloy material for the bottle blank mold as claimed in claim 7, wherein the Cr-Mo-V-N alloy material comprises the following elements in percentage by weight: c: 0.15-0.30%; cr: 13.00-15.00%; mo: 0.80-1.30%; ni: 0.20 to 1.00 percent; n: 0.04-0.15%; v: 0.20-0.35%; mn: 0.20 to 1.00 percent; si is less than or equal to 0.50 percent; s is less than or equal to 0.006 percent; p is less than or equal to 0.025 percent; cu is less than or equal to 0.20 percent, and the balance is Fe.
9. The Cr-Mo-V-N alloy material for the bottle blank mold according to claim 8, wherein the room temperature tensile property of the alloy material is as follows: tensile strength Rm≥1010N/mm2Yield strength RP0.2≥855N/mm2Elongation A4 is more than or equal to 16%, reduction of area Z is more than or equal to 56%, impact energy AKv≥28J/cm2The hardness HBC is more than or equal to 32.5; the room temperature unnotched impact properties were: quenching hardness HRC: 48-52, hardening and tempering hardness HRC: 47-52, and the unnotched impact value is more than or equal to 405J/cm2。
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| JPH11217655A (en) * | 1998-01-28 | 1999-08-10 | Toshiba Corp | High strength heat resistant steel and its production |
| US20040101430A1 (en) * | 2000-06-15 | 2004-05-27 | Odd Sandberg | Steel alloy plastic moulding tool and tough-hardened blank for plastic moulding tools |
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Application publication date: 20220506 |