CN115491582A - Injection molding wear die steel resistant to glass fiber plastic and manufacturing method thereof - Google Patents
Injection molding wear die steel resistant to glass fiber plastic and manufacturing method thereof Download PDFInfo
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- CN115491582A CN115491582A CN202110674687.7A CN202110674687A CN115491582A CN 115491582 A CN115491582 A CN 115491582A CN 202110674687 A CN202110674687 A CN 202110674687A CN 115491582 A CN115491582 A CN 115491582A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 126
- 239000010959 steel Substances 0.000 title claims abstract description 126
- 229920003023 plastic Polymers 0.000 title claims abstract description 31
- 239000004033 plastic Substances 0.000 title claims abstract description 31
- 238000001746 injection moulding Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000003365 glass fiber Substances 0.000 title claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 15
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000005242 forging Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 229910000805 Pig iron Inorganic materials 0.000 claims description 18
- 239000002699 waste material Substances 0.000 claims description 18
- 238000009849 vacuum degassing Methods 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 13
- 238000005496 tempering Methods 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- 229910052720 vanadium Inorganic materials 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 238000010891 electric arc Methods 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 4
- 239000011521 glass Substances 0.000 abstract 1
- 239000011152 fibreglass Substances 0.000 description 13
- 238000004321 preservation Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- 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
- C22C38/04—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
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a die steel product in metallurgical industry, and provides plastic die steel resistant to the abrasion of injection molding of glass fiber-added plastic and a manufacturing method thereof, wherein the plastic die steel comprises the following chemical components in percentage by weight: 0.50 to 0.60% of C,0.30 to 0.60% of Si,0.8 to 1.2% of Mn,5.0 to 6.0% of Cr,2.5 to 3.0% of Mo,0.20 to 0.40% of V,0.30 to 0.50% of Ni,0.025 to 0.030% of Nb, less than or equal to 0.020% of P, less than or equal to 0.010% of S, the balance being Fe and impurity elements; wherein the relationship between Nb and C element content is Nb = C/20; the relationship between the contents of Mo and Cr elements is Mo = Cr/2. The invention improves the wear resistance, adds Ni element to improve toughness, and especially adds Nb element to improve the wear resistance and the toughness of the steel, so that the plastic die steel has the characteristic of obdurability.
Description
Technical Field
The invention relates to a die steel product in the metallurgical industry, in particular to die steel with good resistance to the abrasion of injection molding of glass fiber plastic.
Background
The die is a special tool used in various presses and mounted on the press, and then the metal or nonmetal material is made into the required shape of the part or product by pressing. With the development of modern industry, the application of the die is more and more extensive, and about 60% -80% of parts in products such as automobiles, electronics, instruments and meters, household appliances, aerospace, building materials, motors, communication equipment and the like are processed and formed by the die, so that the die is an important component part in the equipment manufacturing industry. The widespread use of plastic products in the above-mentioned fields has prompted a rapid increase in demand for plastic-forming molds, which have currently developed into the most demanding mold type in the mold field. Among a plurality of plastic types, the glass fiber reinforced plastic is a composite material with wide application, and is a functional novel material prepared by compounding synthetic resin and glass fiber through a compounding process, the relative density of the glass fiber reinforced plastic is between 1.5 and 2.0, the glass fiber reinforced plastic is only 1/4 to 1/5 of carbon steel, but the tensile strength of the glass fiber reinforced plastic is close to or even exceeds that of the carbon steel, so the glass fiber reinforced plastic is widely applied to the relevant industries such as aerospace, railway, decorative buildings, home furniture, building materials, bathroom and sanitation engineering and the like. The abrasion of the surface of the mold cavity can be caused by the scouring of the surface of the mold cavity by the glass fiber in the injection process of the glass fiber reinforced plastic injection molding and the friction of the surface of the mold cavity by the demolding process of the plastic part after the solidification molding, and the service life of the mold is shortened. The blank before the plastic die is processed is in a pre-hard state, the hardness is HRC 30-44, and even if the pre-hard state hardness reaches an upper limit of HRC44, the early wear phenomenon still exists when the die is used for injection molding of glass fiber reinforced plastics.
Patent publication No. CN107974636A, "a high-hardness and high-hardenability pre-hardened plastic die steel and a preparation method thereof", discloses that the chemical components in percentage by weight are as follows: c:0.40 to 0.50%, si:0.2 to 0.5%, S: less than or equal to 0.030 percent, P: less than or equal to 0.030 percent, mn:0.6 to 1.0%, ni:0.8 to 1.5%, mo:0.6 to 2.0%, cr: 1.6-2.5%, V:0.1 to 0.5 percent, and the balance of Fe and inevitable impurities, and has the advantages of higher pre-hardening hardness, higher toughness, higher hardenability and more excellent comprehensive performance compared with the prior art. The hardness of the 460 ℃ tempering treatment after quenching is HRC49.2 at most, although the hardness is improved compared with the hardness of the prior pre-hardened plastic die steel, the early wear phenomenon still exists in the service life of the die for the injection molding of the glass fiber reinforced plastic.
Disclosure of Invention
In order to overcome the defect that the existing plastic die steel is not wear-resistant when used for injection molding of glass fiber reinforced plastics, the invention develops the plastic die steel which is wear-resistant when the glass fiber reinforced plastics are added, and the chemical components (weight percent) of the plastic die steel are as follows: 0.50-0.60% C, 0.30-0.60% Si, 0.8-1.2% Mn, 5.0-6.0% Cr, 2.5-3.0% Mo, 0.20-0.40% V, 0.30-0.50% Ni, 0.025-0.030% Nb, less than or equal to 0.020% P, less than or equal to 0.010% S, the balance being Fe and impurity elements; wherein the relationship between Nb and C element content is Nb = C/20; the relationship between the contents of Mo and Cr elements is Mo = Cr/2.
The composition design of the invention is determined based on the following principle:
carbon is the most effective element for improving the hardness and the strength of the steel, the solid solution strengthening effect is obvious, a large amount of dispersed carbide is precipitated during tempering, the dispersion strengthening effect is achieved, the precipitated carbide is high-hardness second-phase particles, the wear resistance of the steel is improved, but the number of the carbide in the steel is increased due to the fact that the content of the C is too high, and the toughness and the welding performance are reduced. Therefore, the carbon content should not be too high. Therefore, the carbon content of the invention is 0.50-0.60%.
Si has a better deoxidation effect in the steelmaking process, the Si element added into the steel has a solid solution strengthening effect, the hardness of a matrix is improved, but the toughness of the steel is reduced and the graphitization tendency is increased when the Si content is too high, so that the Si content of the invention is 0.30-0.60%.
Mn is an alloy element that significantly improves hardenability and strongly delays pearlite transformation, but too high Mn content tends to coarsen the steel grains, so the Mn content of the present invention is 0.8 to 1.2%.
Cr is a carbide forming element, precipitated high-hardness carbide improves the wear resistance of steel, cr is dissolved into austenite to improve the hardenability of the steel, and a ferrite structure is obtained due to the high Cr content, so that the strength is reduced, and therefore, the Cr content is 5.0-6.0%.
Mo element is a carbide forming element, the wear resistance of the steel is improved by precipitated high-hardness carbide, the hardenability of the steel is improved by solid solution of the Mo element into austenite, and particularly, the hardenability is remarkably improved by adding Cr and Mo elements simultaneously, so that a martensite structure is obtained after quenching of a large-size die, and the toughness of the steel is improved by obtaining a sorbite structure after tempering. However, if the Mo content is too high, the hot working deformation resistance is increased, and the hot workability of the steel is lowered. Therefore, the content of Mo in the invention is 2.5-3.0%, w% Mo = (w% Cr)/2.
The addition of the alloy element V in the steel can separate out MC type high-hardness carbides in the tempering process, improve the wear resistance of the steel, easily separate out large-particle liquated carbides due to overhigh V content, and reduce the toughness. Therefore, the V content of the invention is 0.20 to 0.40%.
The addition of a small amount of Nb in the steel can play a role in grain refinement, improve the impact toughness of the steel, and the addition of Nb in the steel is 0.025-0.030% because large-particle liquated carbides are easily precipitated due to the excessively high Nb content and the toughness is reduced. In order to prevent Nb element from forming large-grain massive liquated carbide with C element, the amount of Nb added needs to be controlled, w% Nb = (w% C)/20.
Ni is an element that significantly improves the toughness of steel, and since an austenite structure occurs when the Ni content is too high, the hardness of steel is reduced, 0.30 to 0.50% of Ni is added in the present invention.
The manufacturing method of the die steel with chemical components comprises the following steps:
the invention adopts the process flows of electric furnace refining, vacuum degassing treatment, injection molding electrode bar, electroslag remelting and forging forming:
the electric furnace smelting adopts 40 tons of electric arc furnace (EAF furnace) to add the prepared pig iron and waste steel into the furnace, electrifying, the graphite electrode arc striking heats the pig iron and the waste steel in the furnace until the pig iron and the waste steel are completely melted, tapping is carried out when the temperature reaches 1630-1640 ℃, and the melted molten steel flows into a refining furnace (40 tons of LF furnace).
And electrifying and heating a ladle of the LF furnace in place, adding alloy elements C, cr, mn, si, mo, V, ni and Nb into the LF furnace according to the chemical component content of the invention, adding lime in two batches, wherein the adding amount is 200 Kg/batch, and adding 20-23 Kg of aluminum ingots for deoxidation when the slag color becomes white. Adjusting the content of various alloy elements in place, measuring the temperature, and transferring a 40-ton LF furnace to a vacuum degassing treatment station (VD) for vacuum degassing treatment when the temperature reaches 1610-1620 ℃.
And (3) covering a sealing cover on a VD station of a 40-ton LF furnace, vacuumizing, keeping for 20-25 minutes after the vacuum degree is less than or equal to 66.7Pa, breaking vacuum, measuring temperature, lifting a ladle when the temperature is reduced to 1520-1530 ℃, placing the ladle on a steel pouring car, pouring a steel ingot with the diameter of 800mm, wherein the steel ingot is a base material for electroslag remelting, cooling a mould to the room temperature after the steel ingot is poured, and transferring the poured steel ingot with the diameter of 800mm to the electroslag remelting station for electroslag remelting and smelting.
The content of CaF +25% by electroslag remelting 2 O 3 The MgO slag system is divided into 10 percent of CaO +5 percent and the specification of the electroslag remelting crystallizer is phi 1000mm, the steel ingot of phi 800mm is electrified as an electrode for electroslag remelting, the end part of the electrode is ignited at the bottom of the crystallizer to heat and melt the electrode, simultaneously 450Kg of slag is added into the crystallizer in batches, 50Kg of slag is added into each batch, the steel slag is simultaneously melted, the electrode is melted at the melting speed of 700-750 Kg per hour, the electroslag is remelted into 15 tons of heavy steel ingots, the forging heating adopts the heating process of heating at 1180-1200 ℃ and preserving heat for 8-10 hours to heat, the 400 x 1000mm flat square strip section is forged by a 4000 ton quick forging machine, and the annealing process of preserving heat for 20-24 hours at 900-950 ℃ after forging is adopted.
According to the manufacturing method of the injection molding abrasion die steel of the additive-resistant glass fiber plastic, the hardness of the prepared die steel after quenching and tempering reaches HRC 55-56, and the impact energy of a 7 multiplied by 10 multiplied by 55 sample without a notch in the longitudinal direction is 220-235J.
The invention has the beneficial technical effects that:
the invention overcomes the defect that the existing plastic die steel is not wear-resistant when used for injection molding of glass fiber reinforced plastics, improves the carbon content through reasonable component design, adds carbides to form elements Cr, mo and V to form high-hardness carbides to improve the wear resistance, adds Ni to improve the toughness, and particularly adds Nb to improve the wear resistance and the toughness of the steel, so that the plastic die steel has the characteristic of combining toughness and toughness, the hardness of the die processed by the steel of the invention after quenching and tempering reaches HRC55, and the wear resistance of the die for injection molding of the glass fiber reinforced plastics is obviously improved.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way.
The invention adopts the technical processes of 40-ton electric furnace (EAF furnace), 40-ton refining furnace (LF furnace), 40-ton vacuum degassing treatment (VD), injection molding electrode bar, electroslag remelting and forging forming:
example 1:
the electric furnace smelting adopts 40 tons of electric arc furnace (EAF furnace) to add the prepared pig iron and waste steel into the furnace, electrifying, the graphite electrode arc striking heats the pig iron and the waste steel in the furnace until the pig iron and the waste steel are completely melted, tapping is carried out when the temperature reaches 1630 ℃, and the melted molten steel flows into a refining furnace (40 tons of LF furnace).
In-place electrifying and heating a ladle of the LF furnace, adding alloy elements C, cr, mn, si, mo, V, ni and Nb into the LF furnace according to the chemical component content of the invention, adding lime into the LF furnace in two batches, wherein the adding amount is 200 Kg/batch, and adding 20Kg of aluminum ingot for deoxidation when the slag becomes white. Adjusting the content of various alloy elements in place, measuring the temperature, and transferring a 40-ton LF furnace to a vacuum degassing treatment station (VD) for vacuum degassing treatment when the temperature reaches 1620 ℃.
And (3) covering a sealing cover on a VD station of a 40-ton LF furnace, starting vacuumizing, keeping for 20 minutes after the vacuum degree reaches 50Pa, breaking vacuum, measuring temperature, lifting the ladle when the temperature is reduced to 1530 ℃, placing the ladle on a steel pouring car, starting to pour a steel ingot with the diameter of 800mm, wherein the steel ingot is a base material for electroslag remelting, carrying out mold cooling to room temperature after the steel ingot is poured, and then transferring the poured steel ingot with the diameter of 800mm to an electroslag remelting station for electroslag remelting.
The content of CaF +25% by electroslag remelting 2 O 3 +10% of CaO +5% of MgO slag system, the specification of an electroslag remelting crystallizer is phi 1000mm, a steel ingot of phi 800mm is electrified as an electrode for electroslag remelting, the end of the electrode is arc-ignited at the bottom of the crystallizer to heat and melt the electrode, simultaneously 450Kg of slag is added into the crystallizer in batches, 50Kg of slag is added into each batch, the steel slag is melted simultaneously, the electrode is melted at a melting speed of 750Kg per hour, the electroslag is remelted into 15 tons of heavy steel ingots, the forging heating is carried out by a heating process of heating at 1180 ℃ and keeping the temperature for 9 hours, a 4000 ton fast forging machine is adopted to forge into 400 x 1000mm of flat and long strip-shaped materials, and annealing treatment is carried out by an annealing process of keeping the temperature at 920 ℃ for 22 hours after forging.
Table 1 example 1 chemical composition
| C | Si | Mn | P | S | Cr | Mo | V | Nb | Ni |
| 0.50 | 0.60 | 1.0 | 0.015 | 0.008 | 5.8 | 2.9 | 0.35 | 0.025 | 0.30 |
Taking 300X 400X 500mm test blocks in the center area of the end face of a flat square strip section of 400X 1000mm, carrying out heat preservation at 1020 ℃ for 3 hours, carrying out oil cooling to room temperature for quenching treatment, carrying out heat preservation at 560 ℃ for 10 hours, carrying out tempering for 2 times, wherein the hardness is HRC55, and the impact energy of a longitudinal unnotched 7X 10X 55 test sample is 224J.
Example 2:
the electric furnace smelting adopts 40 tons of electric arc furnace (EAF furnace) to add the prepared pig iron and waste steel into the furnace, electrifying, the graphite electrode arc striking heats the pig iron and the waste steel in the furnace until the pig iron and the waste steel are completely melted, tapping is carried out when the temperature reaches 1635 ℃, and the melted molten steel flows into a refining furnace (40 tons of LF furnace).
And electrifying and heating a ladle of the LF furnace in place, adding alloy elements C, cr, mn, si, mo, V, ni and Nb into the LF furnace according to the chemical component content of the invention, adding lime in two batches, wherein the adding amount is 200 Kg/batch, and adding 23Kg of aluminum ingot for deoxidation when the slag color becomes white. Adjusting the content of various alloy elements in place, measuring the temperature, and transferring a 40-ton LF furnace to a vacuum degassing treatment station (VD) for vacuum degassing treatment when the temperature reaches 1610 ℃.
And covering a sealing cover on a VD station of a 40-ton LF furnace, starting vacuumizing, keeping for 20 minutes after the vacuum degree reaches 62Pa, breaking the vacuum, measuring the temperature, hanging the ladle when the temperature is reduced to 1520 ℃, placing the ladle on a steel pouring vehicle, starting pouring a steel ingot with the diameter of phi 800mm, wherein the steel ingot is a base material for electroslag remelting, carrying out mold cooling to room temperature after the steel ingot is poured, and then transferring the poured steel ingot with the diameter of phi 800mm to an electroslag remelting station for electroslag remelting smelting.
Electroslag remelting employing 60% of CaF +25% 2 O 3 +10% of CaO +5% of MgO slag system, the specification of the electroslag remelting crystallizer is phi 1000mm, the steel ingot of phi 800mm is electrified as an electrode for electroslag remelting, the end part of the electrode is ignited at the bottom of the crystallizer to heat and melt the electrode, simultaneously 450Kg of slag is added into the crystallizer in batches, 50Kg of slag is added into each batch, the steel slag is simultaneously melted, the electrode is melted at the melting speed of 700Kg per hour, the electroslag is remelted into 15 tons of heavy steel ingots, the forging heating adopts the heating process of heating at 1200 ℃ and preserving heat for 8 hours, the forging heating adopts a 4000 ton rapid forging machine to forge into 400 x 1000mm flat square strip sections, and the annealing process after forging adopts the annealing process of preserving heat for 20 hours at 950 ℃.
Table 2 example 2 chemical composition
| C | Si | Mn | P | S | Cr | Mo | V | Nb | Ni |
| 0.60 | 0.30 | 0.8 | 0.018 | 0.005 | 6.0 | 3.0 | 0.20 | 0.030 | 0.50 |
Taking 300X 400X 500mm test blocks in the center area of the end face of a flat square strip section of 400X 1000mm, carrying out heat preservation at 1020 ℃ for 3 hours, carrying out oil cooling to room temperature for quenching treatment, carrying out heat preservation at 560 ℃ for 10 hours, carrying out tempering for 2 times, wherein the hardness is HRC55.5, and the longitudinal unnotched impact energy of a 7X 10X 55 sample is 220J.
Example 3:
the electric furnace smelting adopts a 40-ton electric arc furnace (EAF furnace) to add prepared pig iron and waste steel into the furnace, electrifying, leading an arc by a graphite electrode to heat the pig iron and the waste steel in the furnace until the pig iron and the waste steel are completely molten, tapping when the temperature reaches 1640 ℃, and flowing the molten steel into a refining furnace (40-ton LF furnace).
And electrifying and heating a ladle of the LF furnace in place, adding alloy elements C, cr, mn, si, mo, V, ni and Nb into the LF furnace according to the chemical component content of the invention, adding lime in two batches, wherein the adding amount is 200 Kg/batch, and adding 21Kg of aluminum ingot for deoxidation when the slag color becomes white. Adjusting the content of various alloy elements in place, measuring the temperature, and transferring a 40-ton LF furnace to a vacuum degassing treatment station (VD) for vacuum degassing treatment when the temperature reaches 1615 ℃.
And (3) covering a sealing cover on a VD station of a 40-ton LF furnace, starting vacuumizing, keeping for 22 minutes after the vacuum degree reaches 58Pa, breaking vacuum, measuring temperature, hanging a ladle when the temperature is reduced to 1525 ℃, placing the ladle on a steel pouring car, starting to pour a steel ingot with the diameter of 800mm, wherein the steel ingot is a base material for electroslag remelting, carrying out mold cooling to room temperature after the steel ingot is poured, and then transferring the poured steel ingot with the diameter of 800mm to an electroslag remelting station for electroslag remelting and smelting.
Electroslag remelting employing 60% of CaF +25% 2 O 3 +10% of CaO +5% of MgO slag system, the specification of the electroslag remelting crystallizer is phi 1000mm, electrifying a steel ingot with the phi 800mm as an electrode for electroslag remelting, striking an arc at the end of the electrode at the bottom of the crystallizer to heat and melt the electrode, simultaneously adding 450Kg of slag into the crystallizer in batches, adding 50Kg of slag into each batch, simultaneously melting steel slag, melting the electrode at a melting speed of 730Kg per hour, remelting the electroslag into 15 tons of heavy steel ingots, heating by a heating process of heating at 1190 ℃ and keeping the temperature for 9 hours, forging into 400 x 1000mm flat rectangular sections by a 4000 ton rapid forging machine, and annealing by an annealing process of keeping the temperature for 23 hours at 900 ℃.
Table 3 example 3 chemical composition
| C | Si | Mn | P | S | Cr | Mo | V | Nb | Ni |
| 0.56 | 0.45 | 1.2 | 0.013 | 0.006 | 5.0 | 2.5 | 0.40 | 0.028 | 0.36 |
Taking 300X 400X 500mm test blocks in the center area of the end face of a flat square strip section of 400X 1000mm, carrying out heat preservation at 1020 ℃ for 3 hours, carrying out oil cooling to room temperature for quenching treatment, carrying out heat preservation at 560 ℃ for 10 hours, carrying out tempering for 2 times, wherein the hardness is HRC56, and the impact power of a longitudinal unnotched 7X 10X 55 test sample is 226J
Example 4:
the electric furnace smelting adopts 40 tons of electric arc furnace (EAF furnace) to add the prepared pig iron and waste steel into the furnace, electrifying, the graphite electrode arc striking heats the pig iron and the waste steel in the furnace until the pig iron and the waste steel are completely melted, tapping is carried out when the temperature reaches 1638 ℃, and the melted molten steel flows into a refining furnace (40 tons of LF furnace).
And electrifying and heating a ladle of the LF furnace in place, adding alloy elements C, cr, mn, si, mo, V, ni and Nb into the LF furnace according to the chemical component content of the invention, adding lime in two batches, wherein the adding amount is 200 Kg/batch, and adding 22Kg of aluminum ingot for deoxidation when the slag color becomes white. Adjusting the content of various alloy elements in place, measuring the temperature, and transferring the 40-ton LF furnace to a vacuum degassing treatment station (VD) for vacuum degassing treatment when the temperature reaches 1618 ℃.
And (3) covering a sealing cover on a VD station of a 40-ton LF furnace, starting vacuumizing, keeping for 24 minutes after the vacuum degree reaches 55Pa, breaking vacuum, measuring temperature, hanging a ladle when the temperature is reduced to 1526 ℃, placing the ladle on a steel pouring car, starting to pour a steel ingot with the diameter of 800mm, wherein the steel ingot is a base material for electroslag remelting, carrying out mold cooling to room temperature after the steel ingot is poured, and then transferring the poured steel ingot with the diameter of 800mm to an electroslag remelting station for electroslag remelting and smelting.
The content of CaF +25% by electroslag remelting 2 O 3 The MgO slag system is divided into 10 percent of CaO +5 percent and the specification of the electroslag remelting crystallizer is phi 1000mm, the steel ingot with the phi 800mm is electrified as an electrode for electroslag remelting, the end part of the electrode is ignited at the bottom of the crystallizer to heat and melt the electrode, simultaneously 450Kg of slag is added into the crystallizer in batches, 50Kg of slag is added into each batch, the steel slag is simultaneously melted, the electrode is melted at the melting speed of 720Kg per hour, the electroslag is remelted into 15 tons of heavy steel ingots, the forging heating adopts the heating process of heating at 1185 ℃ and preserving heat for 10 hours, the forging heating adopts a 4000 ton rapid forging machine to forge into 400 multiplied by 1000mm flat rectangular sectional materials, and the annealing process of preserving heat for 24 hours at 920 ℃ after the forging is adopted for annealing treatment.
Table 4 example 4 chemical composition
| C | Si | Mn | P | S | Cr | Mo | V | Nb | Ni |
| 0.58 | 0.35 | 1.1 | 0.016 | 0.007 | 5.4 | 2.7 | 0.32 | 0.029 | 0.45 |
Taking 300X 400X 500mm test blocks in the center area of the end face of a flat square strip section of 400X 1000mm, carrying out heat preservation at 1020 ℃ for 3 hours, carrying out oil cooling to room temperature for quenching treatment, carrying out heat preservation at 560 ℃ for 10 hours, carrying out tempering for 2 times, wherein the hardness is HRC55, and the impact energy of a longitudinal unnotched 7X 10X 55 test sample is 235J.
Comparative example:
adopting a process flow of 40-ton electric furnace (EAF furnace), 40-ton refining furnace (LF furnace), 40-ton vacuum degassing treatment (VD), injection molding electrode bar, electroslag remelting and forging forming (400 multiplied by 1000mm of flat and square strip section bar);
table 5 chemical composition of comparative examples
| C | Si | Mn | P | S | Cr | Mo | V | Nb | Ni |
| 0.38 | 0.21 | 0.43 | 0.018 | 0.005 | 2.12 | 0.56 | 0.15 | / | 0.12 |
Taking 300X 400X 500mm test blocks in the center area of the end face of a flat square strip section of 400X 1000mm, carrying out heat preservation at 870 ℃ for 3 hours, carrying out oil cooling to room temperature quenching treatment, carrying out heat preservation at 560 ℃ for 10 hours, carrying out tempering for 2 times, wherein the hardness is HRC35, and the longitudinal unnotched impact power of a 7X 10X 55 test sample is 265J.
The hardness of the plastic die steel after thermal refining reaches HRC 55-56, which is much higher than that of the existing plastic die steel (the hardness after thermal refining in the comparative example is only HRC 35), the toughness is good, the longitudinal unnotched 7 multiplied by 10 multiplied by 55 sample impact energy is 220-235J, the plastic die steel is processed into a die for glass fiber reinforced plastic injection molding, the service life of the die exceeds 50 thousands, and the service life of the die is obviously prolonged.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The addition-resistant glass fiber plastic injection molding wear-resistant die steel is characterized by comprising the following elements in percentage by weight: 0.50 to 0.60% of C,0.30 to 0.60% of Si,0.8 to 1.2% of Mn,5.0 to 6.0% of Cr,2.5 to 3.0% of Mo,0.20 to 0.40% of V,0.30 to 0.50% of Ni,0.025 to 0.030% of Nb, less than or equal to 0.020% of P, less than or equal to 0.010% of S, the balance being Fe and impurity elements; wherein the relationship between Nb and C element content is Nb = C/20; the relationship between the contents of Mo and Cr elements is Mo = Cr/2.
2. The manufacturing method of the wear die steel for injection molding of the additive-resistant glass fiber plastic according to claim 1, which is characterized in that the technological process of electric furnace + refining + vacuum degassing treatment + injection electrode bar + electroslag remelting + forging forming is adopted: the method specifically comprises the following steps:
(1) The electric furnace smelting adopts an electric arc furnace to add the prepared pig iron and the waste steel into the furnace, electrifying, leading the graphite electrode to arc and heat the pig iron and the waste steel in the furnace until the pig iron and the waste steel are completely molten, tapping when the temperature reaches 1630-1640 ℃, and flowing the molten steel into a refining furnace;
(2) Electrifying and heating a ladle in place of an LF furnace, adding alloy elements C, cr, mn, si, mo, V, ni and Nb according to the chemical component content in the LF furnace, adding lime in two batches, and adding Al ingots for deoxidation when the color of slag becomes white; adjusting the content of various alloy elements in place, measuring the temperature, and transferring the LF furnace to a vacuum degassing treatment station (VD) for vacuum degassing treatment when the temperature reaches 1610-1620 ℃;
(3) Covering a sealing cover on a VD station of the LF furnace, starting vacuumizing, keeping for 20-25 minutes after the vacuum degree is less than or equal to 66.7Pa, breaking vacuum, measuring temperature, lifting a ladle when the temperature is reduced to 1520-1530 ℃, placing the ladle on a steel pouring vehicle, starting pouring a steel ingot, wherein the steel ingot is a base material for electroslag remelting, cooling a mold to room temperature after the steel ingot is poured, and then transferring the poured steel ingot to an electroslag remelting station for electroslag remelting;
(4) The content of CaF +25% by electroslag remelting 2 O 3 +10% of CaO +5% of MgO slag system, electrifying the steel ingot as an electrode for electroslag remelting, striking an arc at the end of the electrode at the bottom of a crystallizer to heat and melt the electrode, simultaneously adding slag materials into the crystallizer in batches, melting steel slag simultaneously, melting the electrode at the melting speed of 700-750 Kg, remelting the electroslag into heavy steel ingots by electroslag remelting, heating by adopting a heating process of heating at 1180-1200 ℃ and preserving heat for 8-10 hours, forging into flat and square long sections by adopting a rapid forging machine, and annealing after forging by adopting an annealing process of preserving heat at 900-950 ℃ for 20-24.
3. The method for manufacturing the mold steel for injection molding wear resistant to glass fiber plastic according to claim 2, wherein in the step (1), a 40 ton arc furnace is adopted as the arc furnace.
4. The method for manufacturing the wear-resistant mold steel for injection molding of glass fiber plastics according to claim 2, wherein in the step (2), the refining furnace is a 40-ton LF furnace.
5. The method for manufacturing the wear-resistant die steel for injection molding of glass fiber plastics, according to claim 2, is characterized in that 200Kg of lime is added in the step (2), and 20Kg-23KgAl ingots are added for deoxidation after the slag turns white.
6. The method for manufacturing the wear-resistant mold steel for injection molding of glass fiber plastic added according to claim 2, wherein the ingot poured in step (3) is an ingot of phi 800 mm.
7. The method for manufacturing the wear-resistant mold steel for injection molding of glass fiber plastics according to claim 2, wherein the size of the electroslag remelting mold in the step (4) is phi 1000mm.
8. The method for manufacturing the wear-resistant die steel for injection molding of glass fiber plastics, according to claim 2, is characterized in that the die steel is forged into a 400 x 1000mm flat square strip profile by a quick forging machine after the forging and heating in the step (4).
9. The method for manufacturing the wear-resistant die steel for injection molding of glass fiber plastics according to any one of claims 2 to 8, wherein the hardness of the prepared die steel after quenching and tempering is as high as HRC 55-56, and the impact energy of a 7 x 10 x 55 sample without a notch in the longitudinal direction is 220-235J.
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