CN111500932A - Tool steel hot-rolled steel strip and preparation method thereof - Google Patents
Tool steel hot-rolled steel strip and preparation method thereof Download PDFInfo
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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
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- 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
Abstract
The invention relates to a tool steel hot rolled steel strip and a preparation method thereof, wherein the tool steel hot rolled steel strip comprises the following components in percentage by mass: c: 0.52 to 0.59 percent; mn: 0.60% -0.90%; si: 0.15 to 0.35 percent; s: 0-0.015%; p: 0-0.030%; ti: 0.020% -0.040%; b: 0.0012 to 0.0035 percent; and Als: 0.010% -0.050%; cu: 0 to 0.20 percent; impurities: 0 to 0.5 percent; the balance being Fe. The tool steel hot rolled steel strip has the advantages of high hardenability, high wear resistance, good stamping resistance, strong production process operability, good controllability, easy industrial production and lower production cost.
Description
Technical Field
The invention belongs to the field of steel strips, and particularly relates to a tool steel hot-rolled steel strip and a preparation method thereof.
Background
The tool steel is a steel grade with large use amount in production and life, and is widely applied to the aspects of machining, garden tools, knife and blades, and the like. The tool steel has various types, and according to the change of carbon content and alloy components, the tool steel with various specific purposes can be designed to meet the requirements of different use environments and performances.
The steel grades produced by the prior art are as follows: 55. the steel plate is made of the following materials of S55C, 45MnB, 50B and the like, wherein 55 and S55C steel does not contain boron element and has insufficient hardenability and hardenability; 45MnB and 50B contain boron, but have not high carbon content, and therefore, they have insufficient hardenability.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tool steel hot-rolled steel strip and a preparation method thereof, which overcome the defects of low sharpness or high production cost of the existing products, and the hot-rolled steel strip has high hardenability, high wear resistance, good stamping resistance, strong production process operability, good controllability, easy industrial production and lower production cost.
The invention provides a tool steel hot rolled steel strip which comprises the following components in percentage by mass: c: 0.52 to 0.59 percent; mn: 0.60% -0.90%; si: 0.15 to 0.35 percent; s: 0-0.015%; p: 0-0.030%; ti: 0.020% -0.040%; b: 0.0012 to 0.0035 percent; and Als: 0.010% -0.050%; cu: 0 to 0.20 percent; impurities: 0 to 0.5 percent; the balance being Fe.
Preferably, the composition comprises the following components in percentage by mass: c: 0.54 to 0.57 percent; mn: 0.65% -0.80%; si: 0.18 to 0.30 percent; s: 0 to 0.010 percent; p: 0 to 0.025%; ti: 0.020% -0.035%; b: 0.0015 to 0.0030 percent; and Als: 0.015% -0.040%; cu: 0 to 0.20 percent; impurities: 0 to 0.5 percent; the balance being Fe.
The invention also provides a preparation method of the tool steel hot rolled steel strip, which comprises the following steps:
(1) adding a slagging agent into a molten iron raw material, then carrying out oxygen blowing primary smelting in a converter, and discharging steel to obtain primary molten steel; wherein the primary smelting temperature is 1550-1680 ℃, and the primary smelting time is 15-25 min;
(2) sequentially adding ferrosilicon, ferro-silico-manganese, ferro-aluminum and a carburant into the primary molten steel, and blowing argon to carry out primary alloying to obtain primary alloyed molten steel; wherein the argon blowing time is 5min to 10 min;
(3) adding ferrosilicon, metal manganese, ferroboron, ferrotitanium, ferroaluminum and a carburant into the primary alloyed molten steel for secondary alloying, and supplementing active lime and the carburant into a ladle of a refining furnace for refining to obtain refined molten steel; wherein the refining temperature is 1500-1620 ℃ and the time is 35-50 min;
(4) feeding the refined molten steel into a calcium-silicon wire and an aluminum wire, continuously blowing argon in a soft mode to obtain wire-processed refined molten steel, and carrying out continuous casting to obtain a continuous casting plate blank; and finally, rolling the continuous casting plate blank to obtain the tool steel hot rolled steel strip.
The molten iron raw materials in the step (1) comprise 80-90% of molten iron and 10-20% of scrap steel by mass percent; the slag former consists of active lime, raw dolomite, magnesite and OG mud balls.
The addition amount of the slagging agent is 25-40 Kg/ton of the raw molten iron material of active lime, 5-15 Kg/ton of raw dolomite, 7-20 Kg/ton of the raw molten iron material of magnesite and 10-25 Kg/ton of the raw molten iron material of OG mud balls.
The molten iron raw material is mainly obtained by sintering iron ore and other treatment processes, and the raw molten iron has more impurities; some impurities are also introduced into the raw scrap steel; in addition, in the primary alloying and refining processes, because the alloying mainly adopts the addition of iron alloys, the iron alloys generally contain associated ore impurities; although impurities in the molten iron and scrap steel are mostly removed in the steel making process, a small amount of impurities, such as oxygen, nitrogen, etc., remain in the manufactured hot rolled steel strip for tools. The S content in the molten iron raw material is 0-0.010%. The S element is easy to cause the hot brittleness of the steel, and reduces the ductility and the toughness of the steel, thereby improving the cracking risk of the steel in the using process, and the invention requires that the S is less than or equal to 0.010 percent.
The steel releasing temperature in the step (1) is 1550-1680 ℃.
In the step (2), the ferrosilicon component comprises 70-78% of silicon and 22-30% of iron by mass percent; the silico-ferromanganese comprises 15-21% of silicon, 63-70% of manganese and 9-22% of iron; the aluminum iron comprises 35-50% of aluminum and 45-60% of iron.
In the step (2), the addition amount of silicon iron is 0.5-1 Kg/ton of primary molten steel, the addition amount of silicon manganese iron is 6-8 Kg/ton of primary molten steel, the addition amount of aluminum iron is 1.2-2.0 Kg/ton of primary molten steel, and the addition amount of carburant is 5.5-7 Kg/ton of primary molten steel. Kg/ton of primary molten steel: for each ton of primary molten steel, if the addition of the ferro-silico-manganese is 7-8 Kg/ton of primary molten steel, the mass ratio of the addition of the ferro-silico-manganese to the primary molten steel is 7-8 Kg/1 ton.
And (3) blowing argon for 5-10 min in the step (2).
In the production process, most of the alloying is completed in the refining stage in step (3).
In the step (3), the ferrosilicon component comprises 70-78% of silicon and 22-30% of iron by mass percent; the manganese metal component comprises 94-98% of manganese and 2-6% of iron; the ferroboron component comprises 16-20% of boron, 0.5-2.0% of silicon, 0.5-1.5% of aluminum and 75-83% of iron; the ferrotitanium component comprises 65-75% of titanium, 0.5-1.5% of aluminum and 23-34% of iron; the aluminum-iron component comprises 35-50% of aluminum and 45-60% of iron.
In the step (3), the addition amount of silicon and iron is 0-1 Kg/ton of primary alloyed molten steel, the addition amount of metal manganese is 2-4 Kg/ton of primary alloyed molten steel, the addition amount of ferroboron is 0.10-0.15 Kg/ton of primary alloyed molten steel, the addition amount of ferrotitanium is 0.65-0.9 Kg/ton of primary alloyed molten steel, the addition amount of aluminum and iron is 2.0-3.5 Kg/ton of primary alloyed molten steel, and the addition amount of carburant is 0.60-0.70 Kg/ton of primary refined molten steel.
In the step (3), 5-12 Kg of quick lime is supplemented per ton of primary alloying molten steel, and 0-2Kg of carburant is supplemented per ton of primary alloying molten steel.
In the production process, wire feeding, continuous casting and rolling are completed in step (4).
The wire feeding amount of the calcium silicon wire in the step (4) is 1-2 Kg/ton of refined molten steel, and the diameter of the calcium silicon wire is 12-15 mm; the wire feeding amount of the aluminum wire is 0.5-1 Kg/ton of refined molten steel, and the diameter of the aluminum wire is 12-15 mm. According to the mass percentage, the silicon-calcium wire comprises 50-65% of silicon, 25-35% of calcium and 5-15% of iron.
And (4) continuing to blow argon for 5-15 min in a soft manner to obtain the refined molten steel for the wire treatment.
The continuous casting process in the step (4) comprises the following steps: the casting temperature is 1500-1530 ℃, and the blank drawing speed of continuous casting is 0.6-1.3 m/min; the rolling process comprises the following steps: the rolling temperature is 1150-1250 ℃, and the rolling coiling temperature is 620-700 ℃.
The invention can be used for manufacturing garden tools and cutting tools, particularly has large use amount in the aspect of garden tools, requires products with high hardenability and low fracture incidence rate and has low processing cost, and the sales volume of the products can be improved only by designing the products with excellent performance and high market acceptance. The performance of the steel product is determined by chemical components and a production process, the influence of the components and the content of the components in the steel on the performance of the product is fully considered, the production process for ensuring the product quality is explored, and the research and development of the product tend to promote the powerful development of the tool steel industry.
The invention is obviously different from the prior art in terms of production technology, for example, the invention adopts a converter for production, but the prior art mostly adopts an electric furnace for production; the invention adopts the titanium-adding nitrogen-fixing technology to improve the effective boron content in the steel so as to improve the product performance, and the titanium element is mostly not added in the prior art; the invention adopts specific continuous casting and hot rolling processes to ensure the product quality and other technologies, and has essential difference from the prior similar technologies.
Advantageous effects
(1) The components in the hot rolled steel strip for the tool have strong synergistic effect with each other through strict control of the components in the raw materials, so that the hot rolled steel strip for the tool has excellent performance: has higher strength (wherein the tensile strength Rm is more than or equal to 774MPa) and good toughness (the elongation A is more than or equal to 15%); the hot-rolled steel strip of the heat-treated tool steel has high hardenability, high wear resistance and good stamping resistance;
(2) the tool steel hot rolled steel strip can be directly used for stamping without annealing through a microalloying process, so that the production and processing cost is greatly reduced, the product cost performance is high, and the market competitiveness is strong.
(3) The production process of the tool steel hot rolled steel strip has strong operability, good controllability, easy industrial production, low production cost and good economic benefit, is beneficial to market popularization and application, and has wide application prospect and important strategic significance.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The basic flow of the production process comprises the steps of converter primary smelting → primary alloying → L F refining → continuous casting → rolling → coiling.
Example 1
The following percentages are all calculated by mass percent:
(1) primary smelting in a converter:
27.35 tons of scrap steel are added into the molten iron, the total charging amount is 218 tons, and the mass percentage of S in the molten iron is 0.003 percent. Adding 35Kg of active lime, 17Kg of limestone, 10Kg of raw dolomite and 14.5Kg of magnesite into molten steel. And carrying out primary smelting in a primary smelting furnace for 21min, and discharging steel after the primary smelting is finished, wherein the steel discharging temperature is 1655 ℃, so that primary molten steel is obtained, and the primary molten steel is 192.4 tons.
(2) Preliminary alloying
Adding a silicon-manganese alloy (FeMn68Si18, containing 68% of manganese, 18% of silicon, less than 5% of other impurities and the balance of iron) into the primary molten steel obtained in the step (1), wherein the adding amount is 7.5 Kg/ton of primary molten steel; then adding aluminum iron (FeAl40, containing 40% of aluminum, less than 5% of other impurities and the balance of iron) in an amount of 1.78Kg per ton of primary molten steel; argon blowing time is 7 min.
(3) L F refining:
transferring the molten steel primarily alloyed in the step (2) to a L F refining furnace, adding 0.13 Kg/ton of ferroboron (FeB20 comprising 20% of boron, 2% of silicon, 0.5% of aluminum, less than 5% of other impurities and the balance of iron) to the molten steel primarily refined at L F, 0.68 Kg/ton of ferrotitanium (FeTi70 comprising 70% of titanium, 1% of aluminum, less than 5% of other impurities and the balance of iron) to the molten steel primarily refined at L F, 3 Kg/ton of ferrotitanium (FeMn72 comprising 72% of manganese, 2% of carbon, less than 5% of other impurities and the balance of iron) to the molten steel primarily refined at 1.4 Kg/ton, adding 0.64 Kg/ton of carburant (comprising 92% of carbon and less than 5% of other impurities) to the molten steel primarily refined at 3878 Kg/ton, adding lime to the molten steel primarily refined at the temperature of 3943-1500F, and finishing refining at the temperature of 3878-1500F.
(4) Continuous casting:
feeding a silicon-calcium wire (Si50Ca28 comprising 50% of silicon, 28% of calcium, less than 5% of other impurities and the balance of iron) to the L F refined molten steel obtained in the step (3) for 3 m/ton of refined molten steel, feeding an aluminum wire (99.5% of aluminum content) for 3.5 m/ton of refined molten steel, blowing argon for 8min to obtain wire-processed refined molten steel, pouring at the beginning temperature of 1520 ℃, wherein the section of a continuous casting billet is 230mm × 1300mm, and the billet drawing speed is 1.1m/min to obtain a casting billet.
(5) Rolling:
and (4) rolling the casting blank obtained in the step (4) at a high temperature of 1230 ℃ at the initial rolling temperature, and coiling at a temperature of 680 ℃ to obtain a hot rolled steel strip with the thickness of 5 mm.
Example 2
The following percentages are all calculated by mass percent:
(1) primary smelting in a converter:
28.15 tons of scrap steel are added into the molten iron, the total charging amount is 217 tons, and the mass percentage of S in the molten iron is 0.003 percent. Adding 34Kg of active lime, 16Kg of limestone, 10Kg of raw dolomite and 15Kg of magnesite into molten steel. And (3) carrying out primary smelting in a primary smelting furnace for 20min, and then discharging steel at the temperature of 1647 ℃ to obtain primary molten steel, wherein the primary molten steel is 191.8 tons.
(2) Preliminary alloying
Adding a silicon-manganese alloy (FeMn68Si18, containing 68% of manganese, 18% of silicon, less than 5% of other impurities and the balance of iron) into the primary molten steel obtained in the step (1), wherein the adding amount is 7.5 Kg/ton of primary molten steel; then adding aluminum iron (FeAl40, containing 40% of aluminum, less than 5% of other impurities and the balance of iron) in an amount of 1.82Kg per ton of primary molten steel; argon blowing time is 8 min.
(3) L F refining:
transferring the molten steel primarily alloyed in the step (2) to a L F refining furnace, adding 0.12 Kg/ton of ferroboron (FeB20 comprising 20% of boron, 2% of silicon, 0.5% of aluminum, less than 5% of other impurities and the balance of iron) to the molten steel for primary refining at L F, 0.67 Kg/ton of ferrotitanium (FeTi70 comprising 70% of titanium, 1% of aluminum, less than 5% of other impurities and the balance of iron) to the molten steel for primary refining at L F, 3 Kg/ton of ferrotitanium (FeMn72 comprising 72% of manganese, 2% of carbon, less than 5% of other impurities and the balance of iron) to the molten steel for primary refining at 1.5 Kg/ton, adding 0.65 Kg/ton of carburant (comprising 92% of carbon and less than 5% of other impurities) to the molten steel for primary refining at 387 temperature of 3946 ℃ to the molten steel for primary refining at the end of refining at 38710 ℃ and adding lime to obtain the molten steel for primary refining at the temperature of 3946F.
(4) Continuous casting:
feeding 3.5 m/ton of refined molten steel of a silicon-calcium wire (Si50Ca28 comprising 50% of silicon, 28% of calcium, less than 5% of other impurities and the balance of iron) into the L F refined molten steel obtained in the step (3), feeding 3.2 m/ton of refined molten steel of an aluminum wire (99.5% of aluminum content), blowing argon for 8min to obtain wire-processed refined molten steel, pouring at the casting temperature of 1518 ℃, wherein the section of a continuous casting billet is 230mm × 1300mm, and the billet drawing speed is 1.0m/min to obtain a casting billet.
(5) Rolling:
and (4) rolling the casting blank obtained in the step (4) at the start rolling temperature of 1232 ℃ at a coiling temperature of 680 ℃ to obtain a hot rolled steel strip with the thickness of 4 mm.
Example 3
The following percentages are all calculated by mass percent:
(1) primary smelting in a converter:
26.05 tons of scrap steel are added into the molten iron, the total charging amount is 217 tons, and the mass percentage content of S in the molten iron is 0.004 percent. Adding 35Kg of active lime, 16Kg of limestone, 10Kg of raw dolomite and 15Kg of magnesite into molten steel. And (3) carrying out primary smelting in a primary smelting furnace for 20min, and discharging steel after the primary smelting is finished, wherein the discharging temperature is 1649 ℃, so that primary molten steel is obtained, and the primary molten steel is 193.6 tons.
(2) Preliminary alloying
Adding a silicon-manganese alloy (FeMn68Si18, containing 68% of manganese, 18% of silicon, less than 5% of other impurities and the balance of iron) into the primary molten steel obtained in the step (1), wherein the adding amount is 7.7 Kg/ton of primary molten steel; then adding aluminum iron (FeAl40, containing 40% of aluminum, less than 5% of other impurities and the balance of iron) in an amount of 1.71Kg per ton of primary molten steel; argon blowing time is 7 min.
(3) L F refining:
transferring the molten steel primarily alloyed in the step (2) to a L F refining furnace, adding 0.12 Kg/ton of ferroboron (FeB20 comprising 20% of boron, 2% of silicon, 0.5% of aluminum, less than 5% of other impurities and the balance of iron) to the molten steel primarily refined at L F, 0.69 Kg/ton of ferrotitanium (FeTi70 comprising 70% of titanium, 1% of aluminum, less than 5% of other impurities and the balance of iron) to the molten steel primarily refined at L F, 0.2 Kg/ton of ferrotitanium (FeMn72 comprising 72% of manganese, 2% of carbon, less than 5% of other impurities and the balance of iron) to the molten steel primarily refined at 75 Kg, 1.5 Kg/ton of ferrosilicon (FeSi75 comprising 75% of silicon, less than 5% of other impurities and the balance of iron), 0.66 Kg/ton of carburant (comprising 92% of carbon, less than 5% of other impurities and the balance of iron) to the molten steel primarily refined at the temperature of 3946 ℃ to the molten steel primarily refined at the end of refining, and obtaining 0.66 Kg/ton of lime (48F) to the molten steel primarily refined at the temperature of 3946 ℃ to obtain the molten steel.
(4) Continuous casting:
feeding 3.4 m/t of refined molten steel of a silicon-calcium wire (Si50Ca28 comprising 50% of silicon, 28% of calcium, less than 5% of other impurities and the balance of iron) into the L F refined molten steel obtained in the step (3), feeding 3 m/t of refined molten steel of an aluminum wire (99.5% of aluminum content), blowing argon for 8min to obtain wire-processed refined molten steel, pouring at the casting temperature of 1522 ℃, wherein the section of a continuous casting billet is 230mm × 1300mm, and the billet drawing speed is 1.1m/min to obtain a casting billet.
(5) Rolling:
and (4) rolling the casting blank obtained in the step (4) at the start rolling temperature of 1233 ℃ at a high temperature, and coiling at the coiling temperature of 680 ℃ to obtain a hot rolled steel strip with the thickness of 3 mm.
The chemical components, the mechanical properties and the metallographic structure of the product are respectively shown in tables 1 and 2, the chemical components are detected by a direct-reading spectrometer, and the analysis standard is GB/T223 chemical analysis method for steel and alloy; the mechanical property is tested by adopting a universal mechanical testing machine, and the detection standard is GB/T13239 'Metal Material Low temperature tensile test method'; and the metallographic structure is detected by an optical metallographic microscope, and the judgment standard is GB/T13299 Steel microstructure evaluation method.
TABLE 1 chemical composition of the product (the balance being unavoidable impurities)
wt.％
| C | Si | Mn | S | P | B | Ti | Als | Cu | Fe | |
| Example 1 | 0.55 | 0.21 | 0.67 | 0.002 | 0.018 | 0.0021 | 0.028 | 0.0262 | 0.015 | 98.4 |
| Example 2 | 0.54 | 0.23 | 0.66 | 0.003 | 0.016 | 0.0022 | 0.026 | 0.0285 | 0.017 | 98.4 |
| Example 3 | 0.56 | 0.22 | 0.68 | 0.002 | 0.015 | 0.0019 | 0.031 | 0.0322 | 0.012 | 98.4 |
TABLE 2 mechanical Properties and metallographic Structure of the product
TABLE 3 comparison of Performance indices of like products of the present invention and Prior Art
The results show that the hot rolled steel strips of the tool steel prepared in the examples 1, 2 and 3 have stable control of chemical components, good comprehensive indexes of tensile strength, elongation and metallographic structure, and superior performance in similar products.
Through tests, the hot rolled steel strip of the tool steel produced in the examples 1 to 3 is subjected to heat treatment by a tool company, and the properties are qualified after testing the hardness, the wear resistance and the sharpness, so that the quality requirement of the hot rolled steel strip can be met.
Claims (10)
1. A tool steel hot rolled steel strip is characterized in that: the composite material consists of the following components in percentage by mass: c: 0.52 to 0.59 percent; mn: 0.60% -0.90%; si: 0.15 to 0.35 percent; s: 0-0.015%; p: 0-0.030%; ti: 0.020% -0.040%; b: 0.0012 to 0.0035 percent; and Als: 0.010% -0.050%; cu: 0 to 0.20 percent; impurities: 0 to 0.5 percent; the balance being Fe.
2. The hot rolled steel strip as claimed in claim 1 wherein: the composite material consists of the following components in percentage by mass: c: 0.54 to 0.57 percent; mn: 0.65% -0.80%; si: 0.18 to 0.30 percent; s: 0 to 0.010 percent; p: 0 to 0.025%; ti: 0.020% -0.035%; b: 0.0015 to 0.0030 percent; and Als: 0.015% -0.040%; cu: 0 to 0.20 percent; impurities: 0 to 0.5 percent; the balance being Fe.
3. A preparation method of a tool steel hot rolled steel strip comprises the following steps:
(1) adding a slagging agent into a molten iron raw material, then carrying out oxygen blowing primary smelting in a converter, and discharging steel to obtain primary molten steel; wherein
The primary smelting temperature is 1550-1680 ℃, and the primary smelting time is 15-25 min;
(2) sequentially adding ferrosilicon, ferro-silico-manganese, ferro-aluminum and a carburant into the primary molten steel, and blowing argon to carry out primary alloying to obtain primary alloyed molten steel; wherein the argon blowing time is 5min to 10 min;
(3) adding ferrosilicon, metal manganese, ferroboron, ferrotitanium, ferroaluminum and a carburant into the primary alloyed molten steel for secondary alloying, and supplementing active lime and the carburant into a ladle of a refining furnace for refining to obtain refined molten steel; wherein the refining temperature is 1500-1620 ℃ and the time is 35-50 min;
(4) feeding the refined molten steel into a calcium-silicon wire and an aluminum wire, continuously blowing argon in a soft mode to obtain wire-processed refined molten steel, and carrying out continuous casting to obtain a continuous casting plate blank; and finally, rolling the continuous casting plate blank to obtain the tool steel hot rolled steel strip.
4. The production method according to claim 3, characterized in that: the molten iron raw materials in the step (1) comprise 80-90% of molten iron and 10-20% of scrap steel by mass percent; the slag former consists of active lime, raw dolomite, magnesite and OG mud balls.
5. The method of claim 4, wherein: the addition amount of the slagging agent is 25-40 Kg/ton of the raw molten iron material of active lime, 5-15 Kg/ton of raw dolomite, 7-20 Kg/ton of the raw molten iron material of magnesite and 10-25 Kg/ton of the raw molten iron material of OG mud balls.
6. The production method according to claim 3, characterized in that: in the step (2), the addition amount of silicon iron is 0.5-1 Kg/ton of primary molten steel, the addition amount of silicon manganese iron is 6-8 Kg/ton of primary molten steel, the addition amount of aluminum iron is 1.2-2.0 Kg/ton of primary molten steel, and the addition amount of carburant is 5.5-7 Kg/ton of primary molten steel.
7. The production method according to claim 3, characterized in that: in the step (3), the addition amount of silicon and iron is 0-1 Kg/ton of primary alloyed molten steel, the addition amount of metal manganese is 2-4 Kg/ton of primary alloyed molten steel, the addition amount of ferroboron is 0.10-0.15 Kg/ton of primary alloyed molten steel, the addition amount of ferrotitanium is 0.65-0.9 Kg/ton of primary alloyed molten steel, the addition amount of aluminum and iron is 2.0-3.5 Kg/ton of primary alloyed molten steel, and the addition amount of carburant is 0.60-0.70 Kg/ton of primary refined molten steel.
8. The production method according to claim 3, characterized in that: in the step (3), 5-12 Kg of quick lime is supplemented per ton of primary alloying molten steel, and 0-2Kg of carburant is supplemented per ton of primary alloying molten steel.
9. The production method according to claim 3, characterized in that: the wire feeding amount of the calcium silicon wire in the step (4) is 1-2 Kg/ton of refined molten steel, and the diameter of the calcium silicon wire is 12-15 mm; the wire feeding amount of the aluminum wire is 0.5-1 Kg/ton of refined molten steel, and the diameter of the aluminum wire is 12-15 mm.
10. The production method according to claim 3, characterized in that: the continuous casting process in the step (4) comprises the following steps: the casting temperature is 1500-1530 ℃, and the blank drawing speed of continuous casting is 0.6-1.3 m/min; the rolling process comprises the following steps: the rolling temperature is 1150-1250 ℃, and the rolling coiling temperature is 620-700 ℃.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108368583A (en) * | 2016-01-20 | 2018-08-03 | 新日铁住金株式会社 | Micro Alloying mechanical part steel wire and Micro Alloying mechanical part |
| CN109266965A (en) * | 2018-11-01 | 2019-01-25 | 宁波钢铁有限公司 | A kind of hot rolled strip and its preparation and application |
-
2020
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108368583A (en) * | 2016-01-20 | 2018-08-03 | 新日铁住金株式会社 | Micro Alloying mechanical part steel wire and Micro Alloying mechanical part |
| CN109266965A (en) * | 2018-11-01 | 2019-01-25 | 宁波钢铁有限公司 | A kind of hot rolled strip and its preparation and application |
Non-Patent Citations (2)
| Title |
|---|
| 丁永昌等: "《特种熔炼》", 30 November 1995, 冶金工业出版社 * |
| 佟岗等: "优质园艺工具用钢55MnB热轧钢带的研制开发", 《第十届中国钢铁年会暨第六届宝钢学术年会论文集》 * |
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