CN116716554A - Bimetal saw back steel hot rolled strip and preparation method thereof - Google Patents
Bimetal saw back steel hot rolled strip and preparation method thereof Download PDFInfo
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- CN116716554A CN116716554A CN202310528770.2A CN202310528770A CN116716554A CN 116716554 A CN116716554 A CN 116716554A CN 202310528770 A CN202310528770 A CN 202310528770A CN 116716554 A CN116716554 A CN 116716554A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 177
- 239000010959 steel Substances 0.000 title claims abstract description 177
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 28
- 239000000956 alloy Substances 0.000 claims abstract description 28
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 64
- 238000005096 rolling process Methods 0.000 claims description 35
- 229910052742 iron Inorganic materials 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 22
- 238000007670 refining Methods 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 15
- 238000009749 continuous casting Methods 0.000 claims description 15
- 238000006477 desulfuration reaction Methods 0.000 claims description 15
- 230000023556 desulfurization Effects 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
- 238000010079 rubber tapping Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000005204 segregation Methods 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 238000009842 primary steelmaking Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 6
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 5
- 239000000378 calcium silicate Substances 0.000 claims description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000000630 rising effect Effects 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000005496 tempering Methods 0.000 description 5
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- PWKWDCOTNGQLID-UHFFFAOYSA-N [N].[Ar] Chemical compound [N].[Ar] PWKWDCOTNGQLID-UHFFFAOYSA-N 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- -1 equipment Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides a hot rolled steel strip for bimetal saw back and a preparation method thereof, which belong to the technical field of hot rolled steel strip processing, and comprise the following components in percentage by weight: c:0.38-0.45%, si:0.17-0.37%, mn:0.50-0.80%; p:0-0.030%, S:0-0.015%, cr:0.90-1.20%, mo:0.15-0.25%, V:0.10-0.20%, ca:0.0010 to 0.0040%, al:0.010-0.050%, and the balance of Fe and unavoidable impurities. The noble alloy element content of the hot rolled steel strip of the bimetal saw back steel is low, the overall alloy content is low, the cost is low, the bimetal saw back steel has good performance, and the quality requirement of the bimetal saw back steel can be met.
Description
Technical Field
The invention relates to the technical field of hot rolled steel strip processing, in particular to a hot rolled steel strip for bimetal saw back and a preparation method thereof.
Background
The bimetal saw is a product which is formed by processing two kinds of steel materials with different characteristics (the backing material is a special alloy belt, the tooth material is a high-speed steel wire or hard alloy) through the processes of welding, tooth milling, heat treatment and the like. Because of its particular advantage in cutting stainless steel, tool steel, die steel, alloy steel, etc., it is widely used in sawing fields in the mechanical, metallurgical, building, chemical and electronic industries. When the bimetal saw is used for sawing materials, the saw blade is subjected to complex stresses such as periodic stretching, impact, bending and torsion, so that the bimetal saw back steel has higher strength, wear resistance and fatigue resistance requirements, and has very strict metallurgical quality requirements.
At present, though the component designs of the hot rolled steel strip products of the bimetal saw back steel are different, the main alloy elements are similar, the alloy content is between 4 and 8 percent, and the hot rolled steel strip products have higher noble metal elements such as Ni, mo, V, nb and the like, so that the resource consumption is larger, and the cost is higher.
Disclosure of Invention
The invention solves the problem of how to provide a hot rolled steel strip for bimetal saw back steel and a preparation method thereof, which can reduce alloy content and production cost while ensuring performance.
In order to solve at least one of the above problems, the present invention provides a hot rolled steel strip for bimetal saw back, comprising, in weight percent: c:0.38-0.45%, si:0.17-0.37%, mn:0.50-0.80%; p:0-0.030%, S:0-0.015%, cr:0.90-1.20%, mo:0.15-0.25%, V:0.10-0.20%, ca:0.0010 to 0.0040%, al:0.010-0.050%, and the balance of Fe and unavoidable impurities.
The hot rolled steel strip of the bimetal saw back steel provided by the invention adopts a C and Cr-Mo-V alloying mode, the total alloy content is controlled below 3.2%, no noble alloy elements such as Ni and Nb are contained, the total Mo and V content is below 0.50%, and the cost and resource consumption of the product can be effectively reduced; the quenching degree can be improved by controlling the content of Cr to be in the range of 0.90-1.20%, the strength and the wear resistance of the hot rolled steel strip of the bimetal saw back steel can be improved, lower surface roughness can be easily obtained, the content of Mo is controlled to be 0.15-0.25%, the quenching degree and the tempering stability of the steel can be improved, tempering brittleness caused by other elements can be reduced or inhibited by the simultaneous action of Mo, cr and Mn, the ferrite creep resistance and the heat resistance are obviously improved, the content of V is controlled to be 0.10-0.20%, stable carbide can be formed with carbon, the fine grain structure of the steel is still maintained at a higher temperature, the overheat sensitivity of the steel is obviously reduced, the high-temperature endurance strength and the creep resistance of the steel can be improved when the carbide is dispersed and separated out by heat treatment, and the content of Ca is controlled to be 0.0010-0.0040%, so that the fatigue resistance is improved. The noble alloy element content of the hot rolled steel strip of the bimetal saw back steel is low, the overall alloy content is low, the cost is low, the bimetal saw back steel has good performance, and the quality requirement of the bimetal saw back steel can be met.
In another aspect, the present invention provides a method for preparing a hot rolled steel strip for bimetal saw back, for preparing the hot rolled steel strip for bimetal saw back as described above, comprising the steps of:
s1, adding molten iron, scrap steel and ferromolybdenum alloy into a converter for smelting to obtain primary molten steel;
s2, transferring the primary steelmaking water into an LF refining furnace for refining, adjusting according to target components of the hot rolled steel strip of the bimetal saw back steel, and obtaining refined molten steel after desulfurization and calcium treatment;
s3, continuously casting the refined molten steel, and changing segregation by adopting electromagnetic stirring in the continuous casting process to form a plate blank;
s4, feeding the plate blank into a heating furnace for heating, performing descaling, performing rough rolling to form an intermediate blank, and performing descaling and finish rolling to obtain a finish rolled steel strip;
and S5, cooling the finish rolled steel strip, coiling to form a steel coil, and slowly cooling the steel coil to obtain the hot rolled steel strip for the bimetal saw back.
Preferably, before the step S1, the method further includes:
carrying out desulfurization pretreatment on blast furnace molten iron through a desulfurization station to obtain pretreated molten iron, wherein S in the pretreated molten iron is less than or equal to 0.005%;
the step S1 includes:
and adding the pretreated molten iron, the scrap steel and the ferromolybdenum alloy into a converter for smelting to obtain the primary molten steel.
Preferably, in the step S1, the molten iron ratio in the converter is 85-95%, and the adding amount of the ferromolybdenum is 3-4kg/t.
Preferably, in the step S1, the converter is a top-bottom combined blown converter, the smelting end point requirement P in the top-bottom combined blown converter is less than or equal to 0.010%, the tapping temperature is 1620-1670 ℃, the tapping time is more than or equal to 5min, and ferrosilicon alloy and ferroaluminum alloy are added during tapping to obtain the primary molten steel.
Preferably, in the step S2, the primary steelmaking water is transferred into the LF refining furnace, ferrochrome and ferrovanadium are added, the contents of C element, si element, mn element, cr element and V element are adjusted according to the target components of the hot rolled steel strip of the bimetal saw back steel, lime and premelting slag are added to perform slagging desulfurization, so that S is less than or equal to 0.005%, the adjustment temperature is 1530-1570 ℃, a calcium silicate wire is fed, and argon is blown, so that the refined molten steel is obtained.
Preferably, in the step S3, during the continuous casting, the temperature of the tundish is controlled at 1500-1530 ℃, electromagnetic stirring is adopted to change segregation, the electromagnetic stirring frequency is 7Hz, the current is 280-320A, and the continuous casting drawing speed is 0.8-1.2m/min, so as to form the slab.
Preferably, in the step S4, the slab is hot-charged into the heating furnace by hot feeding, the charging temperature of the slab is not less than 500 ℃, the slab is heated to 1200-1250 ℃, and a reducing atmosphere is maintained in the heating process of the heating furnace.
Preferably, in the step S4, the finish rolling inlet temperature is controlled to be 1000-1070 ℃ and the finish rolling temperature is controlled to be 870-930 ℃.
Preferably, in the step S5, the cooling is performed in a first half cooling mode, the coiling temperature is controlled to be 630-680 ℃, and in the coiling process, a head-tail temperature rising control mode is adopted for the finish rolling steel strip, wherein the head-tail temperature rising length of the finish rolling steel strip is 10-30m, and the temperature rising amplitude is 20-40 ℃.
According to the invention, molten iron, scrap steel and ferromolybdenum are used as raw materials, primary molten steel is obtained through converter smelting, then the primary molten steel is transferred into an LF refining furnace for refining, elements in the molten steel are adjusted according to the requirements of target components in the refining process, refined molten steel is obtained after desulfurization and calcium treatment, the production cost can be reduced through the refining of the LF refining furnace, then the refined molten steel is continuously cast to form a plate blank, segregation is changed through electromagnetic stirring in the continuous casting process, the defect of the plate blank can be avoided, after the plate blank is heated, rough rolling and finish rolling are carried out, a finish rolling steel belt is obtained, scale removal treatment is carried out before the plate blank enters the rough rolling and the finish rolling, the defect is reduced, and then cooling, coiling and slow cooling treatment are carried out, so that the bimetal saw back steel hot rolling steel belt meeting the requirements can be obtained. The preparation method of the hot rolled steel strip for the bimetal saw back provided by the invention has the advantages of simple preparation process and lower preparation cost, and the prepared hot rolled steel strip has good performance and can meet the quality requirement of the bimetal saw back steel.
Drawings
FIG. 1 is a schematic flow chart of a method for producing a hot rolled steel strip for bimetal saw back steel in an embodiment of the invention;
FIG. 2 is a metallographic microstructure of a hot rolled steel strip for a bimetal saw blade in example 1 of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of embodiments of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It should be noted that, without conflict, features in the embodiments of the present invention may be combined with each other. The terms "comprising," "including," "containing," and "having" are intended to be non-limiting, as other steps and other ingredients not affecting the result may be added. The above terms encompass the terms "consisting of … …" and "consisting essentially of … …". Materials, equipment, reagents are commercially available unless otherwise specified.
The embodiment of the invention provides a hot rolled steel strip for bimetal saw back steel, which comprises the following components in percentage by weight: c:0.38-0.45%, si:0.17-0.37%, mn:0.50-0.80%; p:0-0.030%, S:0-0.015%, cr:0.90-1.20%, mo:0.15-0.25%, V:0.10-0.20%, ca:0.0010 to 0.0040%, al:0.010-0.050%, and the balance of Fe and unavoidable impurities.
The hot rolled steel strip of the bimetal saw back steel provided by the embodiment of the invention adopts a C and Cr-Mo-V alloying mode, the total alloy content is controlled below 3.2%, noble alloy elements such as Ni and Nb are not contained, the total content of Mo and V is below 0.50%, and the cost and resource consumption of the product can be effectively reduced; the quenching degree can be improved by controlling the content of Cr to be in the range of 0.90-1.20%, the strength and the wear resistance of the hot rolled steel strip of the bimetal saw back steel can be improved, lower surface roughness can be easily obtained, the content of Mo is controlled to be 0.15-0.25%, the quenching degree and the tempering stability of the steel can be improved, tempering brittleness caused by other elements can be reduced or inhibited by the simultaneous action of Mo, cr and Mn, the ferrite creep resistance and the heat resistance are obviously improved, the content of V is controlled to be 0.10-0.20%, stable carbide can be formed with carbon, the fine grain structure of the steel is still maintained at a higher temperature, the overheat sensitivity of the steel is obviously reduced, the high-temperature endurance strength and the creep resistance of the steel can be improved when the carbide is dispersed and separated out by heat treatment, and the content of Ca is controlled to be 0.0010-0.0040%, so that the fatigue resistance is improved. The hot rolled steel strip noble alloy element content of the bimetal saw back steel provided by the embodiment of the invention is lower, the overall alloy content is lower, the cost is lower, the performance is good, and the quality requirement of the bimetal saw back steel can be met.
Another embodiment of the present invention provides a method for preparing a hot rolled steel strip for bimetal saw back, for preparing the hot rolled steel strip for bimetal saw back as described above, as shown in fig. 1, comprising the steps of:
s1, adding molten iron, scrap steel and ferromolybdenum alloy into a converter for smelting to obtain primary molten steel;
s2, transferring the primary steelmaking water into an LF refining furnace for refining, adjusting according to target components of the hot rolled steel strip of the bimetal saw back steel, and obtaining refined molten steel after desulfurization and calcium treatment;
s3, continuously casting the refined molten steel, and changing segregation by adopting electromagnetic stirring in the continuous casting process to form a plate blank;
s4, feeding the plate blank into a heating furnace for heating, performing descaling, performing rough rolling to form an intermediate blank, and performing descaling and finish rolling to obtain a finish rolled steel strip;
and S5, cooling the finish rolled steel strip, coiling to form a steel coil, and slowly cooling the steel coil to obtain the hot rolled steel strip for the bimetal saw back.
In one embodiment, before step S1, further comprising:
and (3) passing the blast furnace molten iron through a desulfurization station for desulfurization pretreatment to obtain pretreated molten iron, wherein S in the pretreated molten iron is less than or equal to 0.005%.
Correspondingly, in the step S1, pretreated molten iron, scrap steel and ferromolybdenum are taken as raw materials and added into a converter for smelting.
That is, before molten iron is added into a converter, desulfurization pretreatment is performed to ensure that the sulfur content of the molten iron entering the converter is below 0.005%, so that the S content in the target component can be conveniently controlled. Wherein the sulfur content in the blast furnace molten iron is required to be below 0.040%.
In the step S1, the scrap steel comprises heavy mixed scrap steel, other common scrap steel and self-produced common scrap steel, wherein the heavy mixed scrap steel is less than or equal to 20 percent, the other common scrap steel is more than or equal to 60 percent, and the self-produced common scrap steel is more than or equal to 20 percent. The molten iron ratio is 85-95%, that is, the molten iron accounts for 85-95% of the total weight of the raw materials.
The ferromolybdenum is added in the scrap steel tank, and the ferromolybdenum is added according to 3-4kg/t (3-4 kg ferromolybdenum is added in each ton of molten steel).
In the smelting process of the converter, a top-bottom combined blown converter is adopted, wherein bottom blowing is switched by nitrogen and argon, and the smelting end point is required to be less than or equal to 0.010 percent, so that the P content is controlled, the tapping temperature is 1620-1670 ℃, the tapping time is more than or equal to 5 minutes, and ferrosilicon and ferroaluminum are added during tapping, so that the primary molten steel is obtained.
Ferrosilicon is added for alloying, and ferroaluminum can be added for deoxidization.
In the step S2, after the primary molten steel enters an argon station for temperature measurement and sampling, the primary molten steel is transferred into an LF refining furnace (namely, a ladle refining furnace), ferrochrome and ferrovanadium are added, the contents of C element, si element, mn element, cr element and V element are adjusted according to the target components of the hot rolled steel strip of the bimetal saw back steel, lime and premelting slag are added for slagging and desulfurizing, S is less than or equal to 0.005%, the adjustment temperature is 1530-1570 ℃, a calcium silicate wire is fed, and argon is blown, so that the refined molten steel is obtained.
Wherein, the ferrochrome is added according to the amount of 16-17kg/t (16-17 kg ferrochrome is added per ton of primary steelmaking water), the ferrovanadium is added according to the amount of 2.5-3.5kg/t (2.5-3.5 kg ferrovanadium is added per ton of primary steelmaking water), cr and V components are introduced, and then the contents of C element, si element, mn element, cr element and V element are adjusted according to the requirements of target components.
After adjusting the element content, adding lime and premelting slag to carry out slagging desulfurization, so that the sulfur content is less than or equal to 0.005%, adjusting the temperature to 1530-1570 ℃, feeding 400-800m of calcium silicate wire to carry out calcium treatment before the treatment is finished and discharging, and carrying out soft blowing Ar for not less than 5min before hanging ladle to obtain refined molten steel.
In the step S3, the refined molten steel is cast into a plate blank with the thickness of 230mm multiplied by 1100-1400 mm by a continuous casting machine, the temperature of a tundish is controlled to 1500-1530 ℃ in the continuous casting process, electromagnetic stirring is adopted to change segregation, the electromagnetic stirring frequency is 7Hz, the current is 280-320A, and the continuous casting drawing speed is 0.8-1.2m/min, so that the plate blank is formed. The segregation is changed by adopting electromagnetic stirring in the continuous casting process, and the continuous casting condition is controlled, so that the slab without defects is obtained.
And S4, hot charging the plate blank into the heating furnace through hot feeding, wherein the furnace charging temperature of the plate blank is more than or equal to 500 ℃, heating the plate blank to 1200-1250 ℃, and maintaining a reducing atmosphere in the heating process of the heating furnace.
The slab enters the heating furnace in a hot feeding and hot charging mode, so that the energy consumption of the heating furnace can be obviously reduced, the problems of cracking and blank breakage caused by reheating after the slab is cooled can be avoided, the reducing atmosphere is maintained in the heating process, and decarburization and inter-crystal oxidation are prevented.
After rough rolling is finished, the intermediate billet is insulated on a conveying pipeline by adopting an insulation cover, so that the temperature is prevented from falling too fast, the temperature of a finish rolling inlet is ensured to be controlled at 1000-1070 ℃, and the final rolling temperature is controlled at 870-930 ℃.
In order to ensure stability in finish rolling, the descaling pass may be appropriately reduced.
In the step S5, the first half cooling mode is adopted for cooling, the coiling temperature is controlled to be 630-680 ℃, and in the cooling process, the head-tail temperature rising control mode is adopted for the finish rolling steel strip, wherein the head-tail temperature rising length of the finish rolling steel strip is 10-30m, and the temperature rising amplitude is 20-40 ℃.
The first half cooling mode is that the coiling temperature control point is at the middle position of the layer cooling, and the second half is not involved in control and adopts air cooling.
Since the head and tail portions of the finish rolled steel strip are cooled faster than the intermediate portion after rolling, the difference between the head and tail structure and performance and the intermediate portion is easily caused during coiling, and in order to reduce the difference, a head and tail temperature rise control mode is adopted, wherein the head and tail temperature rise length of the finish rolled steel strip is 10-30m, and the temperature rise range is 20-40 ℃. By this treatment, the difference in tensile strength in the longitudinal direction can be controlled to 80MPa or less.
And after coiling and offline, slowly cooling in a slow cooling warehouse for more than 72 hours, and obtaining the hot rolled steel strip of the bimetal saw back steel meeting the requirements.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The experimental methods, which do not address specific conditions in the following examples, are generally in accordance with the conditions recommended by the manufacturer. It should be noted that the percentages in the examples are by weight.
Example 1
1.1, the S content in the blast furnace molten iron is 0.0342%, and the pretreated molten iron with the S content of 0.0047% is obtained after desulfurization pretreatment;
1.2, smelting pretreated molten iron, scrap steel and ferromolybdenum alloy serving as raw materials by adopting a converter, wherein the pretreated molten iron is 198t, the scrap steel is 20t, the molten iron ratio is 90.8%, the scrap steel comprises 15% of heavy mixed scrap steel, 62% of other common scrap steel, 23% of self-produced common scrap steel, and 800kg of ferromolybdenum alloy is added into a scrap steel hopper and is fed into the converter together with the scrap steel;
1.3, smelting by adopting a top-bottom combined blown converter, wherein bottom blowing adopts nitrogen-argon switching, smelting is performed by adopting a double slag method, the smelting end point of the converter is 0.211 percent of C content, 0.0071 percent of P content, the tapping temperature is 1652 ℃, the tapping time is 6min, during tapping, double slag blocking of slag blocking balls and sliding plates are adopted, during tapping, 1600kg of low-phosphorus silicomanganese is added into ladle molten steel for alloying, and 340kg of aluminum-iron alloy is deoxidized, so as to obtain primary molten steel;
1.4, measuring the temperature of the primary molten steel in an argon station, sampling and checking at 1516 ℃, then feeding the primary molten steel into an LF refining furnace, adding 3450kg of ferrochrome and 580kg of ferrovanadium alloy in the treatment process of the LF refining furnace for alloying, adding ferromanganese and ferrosilicon for fine adjustment of components, so that the contents of C element, si element, mn element, cr element and V element in the molten steel are all adjusted to target components, adding 1076kg of lime and 709kg of premelt slag into the molten steel for slagging and desulfurizing, desulfurizing until the S content is 0.0042%, heating to 1555 ℃, feeding 550m of calcium silicate wire into the molten steel before the treatment is finished, and carrying out calcium treatment, and carrying out soft argon blowing for 6min before hanging to obtain refined molten steel;
1.5, casting refined molten steel into a plate blank with the section of 230 multiplied by 1250mm through a plate blank continuous casting machine, controlling the temperature of a tundish at 1515-1523 ℃, adopting special high-carbon steel mold flux as mold flux, adopting electromagnetic stirring to perform center segregation control, and realizing 8 high-quality defect-free plate blank production, wherein the electromagnetic stirring frequency is 7Hz, the current is 300A, and the continuous casting pulling speed is 0.8-1.2 m/min; the slab is sampled and analyzed, a direct-reading spectrometer is adopted for detection, the analysis standard is GB/T223 chemical analysis method for iron and steel and alloy, and the mass fraction content of the chemical components is C:0.421%, si:0.292%, mn:0.745%, P:0.011%, S:0.0041%, cr:1.023%, mo:0.177%, V:0.132%, ca:0.0019%, al:0.0226% Fe and other unavoidable impurities;
1.6, carrying out hot feeding and hot charging on the whole plate blank, controlling the temperature of the plate blank in a furnace to be 540-630 ℃, controlling the total heating time of the plate blank to be 210-220min, soaking for 28-35min, keeping weak reducing atmosphere in the heating process all the time at the tapping temperature of 1225-1245 ℃, carrying out descaling treatment, carrying out 'E1R 1 three-pass + E2R2 three-pass' rough rolling to form an intermediate blank after the plate blank is tapped and descaled, carrying out heat preservation by adopting a heat preservation cover on a transportation track, controlling the temperature of a finish rolling inlet to be 1010-1060 ℃, carrying out scale removal and 'F1-F7 seven-pass' finish rolling to obtain a finish rolling steel strip, controlling the finish rolling temperature to be 895-915 ℃, and reducing the scale removal header before finish rolling to ensure that the finish rolling is stable, wherein the specification of the finish rolling steel strip is (2.5-5.0) mm x (1200-1250) mm;
1.7, cooling the finish rolling steel belt through a laminar cooling device, wherein the cooling mode adopts a first half cooling mode, the first half layer cooling participates in coiling temperature control, the second half layer cooling does not participate in coiling temperature control, only air cooling is performed, a coiling temperature measuring point is arranged at a layer cooling middle position, the coiling temperature is controlled to be 635-675 ℃, and then the finish rolling steel belt is coiled into coils by a coiling machine; since the head and tail parts of the finish rolled steel strip are cooled faster than the middle part after rolling, the difference between the head and tail tissues and performances and the middle part is easily caused in the cooling process, and in order to reduce the difference, a head and tail temperature rise control mode is adopted, wherein the head and tail temperature rise length of the finish rolled steel strip is 15-25m, and the temperature rise range is 25-35 ℃. By the processing mode, the tensile strength difference in the length direction can be controlled within 80 MPa; and (5) rapidly taking off the coil, slowly cooling in a slow cooling warehouse, and slowly cooling for more than 72 hours to obtain the hot rolled steel strip of the bimetal saw back steel.
The product prepared in the embodiment is sampled and analyzed, wherein the mechanical property is tested by a universal mechanical testing machine, the detection standard is GB/T13239, the tensile strength is 1164MPa, and the elongation after break is 16.5%; the metallographic structure is detected by adopting an optical metallographic microscope, and the evaluation standard is GB/T13299, method for evaluating the microstructure of steel, GB/T34474.1, part 1 for evaluating the strip-shaped structure of steel: the metallographic structure of the sample is 'pearlite + little ferrite', class A class 0, class B class 0.5, class C class 0, class D class 0, class Ds class 0, class 0.5 of the banded structure, and no decarburized layer.
Fig. 2 is a photograph of a metallographic microstructure of the product of this example at 1000 times magnification.
After the product is subjected to subsequent cold rolling and heat treatment, the quenching and tempering hardness can be controlled to be HRC55-60, the toughness and fatigue resistance are good, and the quality control requirement of the bimetal saw back steel is met.
Example 2
In this embodiment, the target components are: c:0.415%, si:0.231%, mn:0.662%, P:0.0094%, S:0.0046%, cr:1.008%, mo:0.183%, V:0.149%, ca:0.0011%, al:0.0331%, the balance Fe and other unavoidable impurities, the other conditions being the same as those of example 1.
Example 3
In this embodiment, the target components are: c:0.408%, si:0.240%, mn:0.738%, P:0.0120%, S:0.0014%, cr:1.017%, mo:0.215%, V:0.141%, ca:0.0016%, al:0.0379%, the balance being Fe and other unavoidable impurities, the remaining conditions being identical to those of example 1.
The properties and metallographic structures of the products obtained in examples 2 and 3 were measured by the same test method as in example 1, and the results are shown in tables 1 and 2.
TABLE 1 mechanical Properties of the products
Table 2 metallographic examination data of the products
The products prepared in examples 2 and 3 are processed by cold rolling, heat treatment and the like to obtain the back of the bimetal saw, and the back of the bimetal saw has good toughness and fatigue resistance and meets the quality control requirement of the steel for the back of the bimetal saw.
From the results of example 1 and tables 1-2, it can be seen that the products prepared in examples 1-3 of the present invention have stable chemical composition control, good comprehensive indexes such as tensile strength, elongation after breaking, etc., good control of nonmetallic inclusion, banded structure, decarburized layer, and good toughness and fatigue resistance, and the bimetal saw back formed after processing processes such as cold rolling, heat treatment, etc., meets the quality control requirements of the bimetal saw back steel.
Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.
Claims (10)
1. The hot rolled steel strip for the bimetal saw back is characterized by comprising the following components in percentage by weight: c:0.38-0.45%, si:0.17-0.37%, mn:0.50-0.80%; p:0-0.030%, S:0-0.015%, cr:0.90-1.20%, mo:0.15-0.25%, V:0.10-0.20%, ca:0.0010 to 0.0040%, al:0.010-0.050%, and the balance of Fe and unavoidable impurities.
2. A method for producing a hot rolled steel strip for a bimetal saw back, which is used for producing the hot rolled steel strip for a bimetal saw back according to claim 1, comprising the steps of:
s1, adding molten iron, scrap steel and ferromolybdenum alloy into a converter for smelting to obtain primary molten steel;
s2, transferring the primary steelmaking water into an LF refining furnace for refining, adjusting according to target components of the hot rolled steel strip of the bimetal saw back steel, and obtaining refined molten steel after desulfurization and calcium treatment;
s3, continuously casting the refined molten steel, and changing segregation by adopting electromagnetic stirring in the continuous casting process to form a plate blank;
s4, feeding the plate blank into a heating furnace for heating, performing descaling, performing rough rolling to form an intermediate blank, and performing descaling and finish rolling to obtain a finish rolled steel strip;
and S5, cooling the finish rolled steel strip, coiling to form a steel coil, and slowly cooling the steel coil to obtain the hot rolled steel strip for the bimetal saw back.
3. The method for producing a hot rolled steel strip for a bi-metallic back saw according to claim 2, further comprising, before said step S1:
carrying out desulfurization pretreatment on blast furnace molten iron through a desulfurization station to obtain pretreated molten iron, wherein S in the pretreated molten iron is less than or equal to 0.005%;
the step S1 includes:
and adding the pretreated molten iron, the scrap steel and the ferromolybdenum alloy into a converter for smelting to obtain the primary molten steel.
4. The method for producing hot rolled steel strip for bimetal saw back steel according to claim 2, wherein in the step S1, the ratio of molten iron in the converter is 85-95%, and the adding amount of the ferromolybdenum is 3-4kg/t.
5. The method for producing hot rolled steel strip for bimetal saw back steel according to claim 2, wherein in the step S1, the converter is a top-bottom combined blown converter, the smelting end point requirement P in the top-bottom combined blown converter is less than or equal to 0.010%, the tapping temperature is 1620-1670 ℃, the tapping time is more than or equal to 5min, and ferrosilicon alloy and ferroaluminum alloy are added during tapping to obtain the primary molten steel.
6. The method for producing hot rolled steel strip for bimetal saw back according to claim 2, wherein in the step S2, the primary steelmaking water is transferred into the LF refining furnace, ferrochrome and ferrovanadium are added, and contents of C element, si element, mn element, cr element and V element are adjusted according to target components of the hot rolled steel strip for bimetal saw back, lime and premelting slag are added for slagging and desulfurization, so that S is less than or equal to 0.005%, the adjustment temperature is 1530-1570 ℃, and the refined molten steel is obtained by feeding calcium silicate wires and blowing argon.
7. The method according to claim 2, wherein in the step S3, the temperature of the tundish is controlled to be 1500-1530 ℃ during the continuous casting, the electromagnetic stirring is used for changing segregation, the electromagnetic stirring frequency is 7Hz, the current is 280-320A, and the continuous casting drawing speed is 0.8-1.2m/min, so as to form the slab.
8. The method for producing a hot rolled steel strip for bimetal saw back steel according to claim 2, wherein in the step S4, the slab is hot-charged into the heating furnace by hot feeding, the charging temperature of the slab is not less than 500 ℃, the slab is heated to 1200-1250 ℃, and a reducing atmosphere is maintained during the heating in the heating furnace.
9. The method according to claim 2, wherein in the step S4, the finish rolling inlet temperature is controlled to be 1000-1070 ℃ and the finish rolling temperature is controlled to be 870-930 ℃.
10. The method according to claim 2, wherein in step S5, the cooling is performed in a first half cooling mode, the coiling temperature is controlled to be 630-680 ℃, and during the coiling, a head-tail temperature rise control mode is used for the finish-rolled steel strip, wherein the head-tail temperature rise length of the finish-rolled steel strip is 10-30m, and the temperature rise range is 20-40 ℃.
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