CN116536592B - Steel for circular saw blade matrix and production method thereof - Google Patents
Steel for circular saw blade matrix and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011159 matrix material Substances 0.000 title abstract description 15
- 238000005496 tempering Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 4
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910014458 Ca-Si Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000011777 magnesium Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052749 magnesium Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 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
- 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
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/24—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for saw blades
-
- 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
-
- 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
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A steel for a circular saw blade matrix comprises the following components in percentage by mass: c:0.42-0.50%, si:1.10-1.40%, mn:1.20-1.50%, cr is less than or equal to 0.20%, nb:0.1-0.25%, mg:0.005-0.03%, al <0.001%, ca:0.005-0.06%, RE:0.03-0.08%, P is less than or equal to 0.010%, S is less than or equal to 0.010%, N is less than or equal to 0.0080%, O is less than or equal to 0.0020%, H is less than or equal to 0.0004%, and the balance is Fe and unavoidable impurity elements. The circular saw blade substrate is manufactured from steel by the method of smelting and casting-Bao Zhupi heating-rolling-quenching-tempering. The steel plate has low inclusion content and excellent mechanical property and fatigue resistance.
Description
Technical Field
The application relates to alloy steel and a preparation method thereof, in particular to steel for a circular saw blade matrix and a production method thereof.
Background
In recent years, diamond saw blades are often used for cutting stone materials, building materials, high-temperature resistant materials, ceramics, and other materials having relatively high hardness and brittleness. The present application relates to a steel for saw blade, and is characterized by that it utilizes the steel for saw blade, and utilizes the steel for saw blade to make the saw blade be made into the steel for saw blade, and utilizes the steel for saw blade to make the steel for saw blade be made into the steel for saw blade.
To meet the demanding operating conditions, the blade matrix material must possess the following properties: sufficient strength to withstand substantial impact loads; good plasticity and toughness, higher fatigue limit and elastic limit, so as to play roles in relieving impact and absorbing vibration; the saw blade has certain rigidity, so that the saw blade can maintain a plane state when being loaded and impacted, and the failure caused by sudden increase of load or impact force due to tilting and the like is avoided; the heat resistance is certain, and the performance is prevented from being reduced due to local high temperature caused by friction heat generation between the saw blade and the workpiece to be cut; and meanwhile, the wear resistance is good. Conventional diamond circular saw usually adopts several steels such as 30CrMo, 50Mn2V, 65Mn and 75Cr1 as matrix materials, and obtains the service performance requirement through thermal refining. However, the conventional steel for saw blade substrates such as 65Mn has the following defects that firstly, the hardness is insufficient after heat treatment, the wear resistance is poor, and secondly, the brittleness is high, the toughness is slightly poor, the fatigue resistance is insufficient, so that the service life is short, and the cost is high.
Disclosure of Invention
The application provides steel for a circular saw blade matrix and a production method thereof, wherein Mn, si and Nb are used for compound reinforcement, ca, mg and RE are used for compound deoxidation and purification, so that the content of inclusions in a final product is low, the strength and toughness are high, the fatigue resistance is excellent, and the service life of the product is remarkably prolonged.
The specific technical scheme is as follows:
a steel for a circular saw blade matrix comprises the following components in percentage by mass:
c:0.42-0.50%, si:1.10-1.40%, mn:1.20-1.50%, cr is less than or equal to 0.20%, nb:0.1-0.25%, mg:0.005-0.03%, al <0.001%, ca:0.005-0.06%, RE:0.03-0.08%, P is less than or equal to 0.010%, S is less than or equal to 0.010%, N is less than or equal to 0.0080%, O is less than or equal to 0.0020%, H is less than or equal to 0.0004%, and the balance is Fe and unavoidable impurity elements. The tensile strength of the steel reaches more than 1400MPa, the yield strength reaches more than 1200MPa, the Brinell hardness reaches 420-460, the elongation is more than or equal to 12%, and the Charpy V-shaped longitudinal impact energy Akv at room temperature is more than or equal to 65J.
The nonmetallic inclusion in the steel for the circular saw blade matrix is less than or equal to 1.0 level.
The steel for a circular saw blade substrate of the present application is manufactured by the steps of:
(1) Smelting and casting, converter-LF refining-sheet billet continuous casting;
(2) Bao Zhupi, heating the thin casting blank to 1100-1180 ℃, and preserving heat for 25-40min;
(3) Rolling, namely performing two-stage hot rolling, wherein the rough rolling temperature is 940-1100 ℃, the finish rolling temperature is 850-920 ℃, the rolling reduction rate in the finish rolling stage is more than 40%, the rolling reduction rate in the final pass is less than 15%, performing laminar cooling after rolling, and cooling to 680-750 ℃ at 5-20 ℃/s for coiling;
(4) Quenching, wherein the quenching heating temperature is 780-850 ℃, and water cooling is carried out to a temperature below 200 ℃;
(5) Tempering, wherein the tempering temperature is 470-530 ℃.
In the smelting step, aluminum-free ferrosilicon and ferromanganese are added in the tapping process after the converter for pre-deoxidation, ca-Si wires are added in steel for deoxidation during LF refining, ca-Mg alloy is added for deep desulfurization and deoxidation, and Mg-RE intermediate alloy is added in the steel for modification treatment.
In the step (1), the thickness of the sheet billet is controlled to be 25-50mm.
The tempered tissue is tempered sorbite.
The application has the functions of the elements:
C：0.42-0.50%
the main solid solution strengthening elements in the steel are combined with Nb to form carbide, so that the hardness, strength and wear resistance of the circular saw blade matrix are ensured, but the toughness of the steel material is affected by the excessive C content. Therefore, the C content in the matrix steel of the circular saw blade is controlled to be 0.42-0.50%.
Si：1.10-1.40%
Si plays an important role in deoxidization and can be dissolved in ferrite to affect the strength performance of steel. And Si can reduce the peak temperature of secondary hardening by 10-70 ℃, improve the secondary Hardness (HRC) by 1-3, reduce the precipitation temperature of carbide during tempering, refine the carbide precipitated by tempering and increase the precipitation amount of the carbide, and promote the secondary hardening effect of steel. Therefore, the Si content in the circular saw blade matrix steel is controlled to be 1.10-1.40%.
Mn：1.20-1.50%
Mn is an austenite expanding element, and can also improve the strength of steel, increase the hardenability of steel and improve the hardness and strength of steel. When the content of Mn element is too high, the tempering brittleness sensitivity of steel is increased, and segregation and cracks in a casting blank are easily caused. Therefore, the content of Mn in the circular saw blade matrix steel is controlled to be 1.20-1.50%.
Nb：0.1-0.25%
Nb is a strong carbide forming element, improves the hardness and strength of steel, improves toughness and tempering stability, and produces a secondary hardening effect. However, when the Nb content is too large, precipitated second phase particles become significantly coarser, and the above effect is rather impaired, and the toughness of the steel may be affected. Therefore, the content of Nb in the circular saw blade matrix steel is controlled to be 0.1-0.25%.
Mg：0.005-0.03%
Magnesium has strong affinity with oxygen, nitrogen and sulfur, can achieve good deoxidization effect, and reduces the oxygen content to an extremely low level. Meanwhile, the magnesium can improve the distribution of carbide in an as-cast structure, homogenize the distribution of the carbide and refine the size of the carbide. Meanwhile, mg can also form composite inclusions which are easy to float up together with CaO and MnS, so that the inclusion content in molten steel is reduced.
Ca：0.005-0.06％
Ca plays a role in desulfurizing and improving the morphology of inclusions, and can also obviously reduce the segregation of S at grain boundaries, which is beneficial to improving the quality of cast steel and further improving the performance of the steel. Therefore, the Ca content in the circular saw blade matrix steel according to the present application is controlled to be 0.005-0.06%.
RE: the addition of proper amount of rare earth can reduce segregation of sulfur, phosphorus and other elements, improve the shape, size and distribution of nonmetallic inclusion, refine crystal grains and increase hardness. After RE and Mg are added into molten steel in a compounding way, because the atomic radiuses of Mg, ce and La are larger than that of Fe, larger lattice distortion can be generated in the solid solution process, and rare earth and magnesium can be biased towards a grain boundary in order to reduce distortion energy, so that the effects of purifying the grain boundary and improving the toughness are achieved.
Al<0.001%
Al is a deoxidizer commonly used in the art, but hard brittle inclusions Al2O3, (Mg/Mn) O.Al2O3, etc. are formed during deoxidization, and inclusions in steel, particularly brittle inclusions, are key factors for reducing the fatigue life and impact resistance of steel, and in order to avoid the occurrence of the brittle inclusions, al is not used as a deoxidizer in the application, and the Al content in raw materials is strictly controlled.
P and S are both unavoidable harmful impurities in steel, their presence severely deteriorating the toughness of the steel. In the application, P is controlled to be less than or equal to 0.010 percent, and S is controlled to be less than or equal to 0.010 percent.
The circular saw blade base material steel and the production method thereof have the following advantages:
according to the application, nb is used as a carbide forming element, expensive V is avoided, the hardenability is increased by adding Si and Mn, meanwhile, the Si is thinned back to NbC during tempering, and the precipitation amount is increased, so that the strength and toughness of the tempered steel plate are ensured.
In the smelting step, aluminum-free ferrosilicon and ferromanganese are added in the converter tapping process for pre-deoxidation, and firstly Ca-Si wires are added into steel for deoxidation and then Ca-Mg alloy is added for deep desulfurization and deoxidation during LF refining. The bonding capability of Mg and oxygen is far greater than that of Mg and sulfur, when Mg is added into molten steel, the Mg is firstly bonded with oxygen, and as the reaction proceeds, the oxygen in the molten steel is continuously reduced to an extremely low level, thereby effectively avoiding Al 2 O 3 The hard phase is generated, and meanwhile, the generated MgO can form composite inclusions which are easy to float together with CaO, mnS and residual in molten steel, so that the content of nonmetallic inclusions in the final steel is reduced, and the nonmetallic inclusions in the product are all less than or equal to 1.0 level. The addition of the Mg-RE intermediate alloy not only can effectively purify the grain boundary and improve the shape, the size and the distribution of nonmetallic inclusions, but also can effectively refine the size of carbide by Mg and RE composite modification,avoiding the influence of large-size carbide. Through the process, the toughness and fatigue resistance of the steel are effectively improved.
In order to avoid carbide growth caused by low cooling rate of the center of a casting blank in the casting process, the application adopts thin slab continuous casting, controls the thickness of the slab to be between 20 and 50mm, and effectively inhibits the formation of large-size carbide.
According to the application, after quenching, high-temperature tempering is selected to obtain tempered sorbite, so that the strength, hardness and toughness of the tempered sorbite are better balanced, and the circular saw blade base material meeting the performance requirements is obtained.
Detailed Description
Examples A1 to A5 are examples of the present application, and B1 to B9 are comparative examples of the present application, and the specific components are shown in Table 1 below. Examples A1-A5 were all prepared according to the following procedure, with specific process parameters as shown in Table 2. The preparation process of comparative examples B1 to B9 was the same as that of A5.
(1) Smelting and casting, converter-LF refining-sheet billet continuous casting;
(2) Bao Zhupi, heating the thin casting blank to 1100-1180 ℃, and preserving heat for 25-40min;
(3) Rolling, namely performing two-stage hot rolling, wherein the rough rolling temperature is 940-1100 ℃, the finish rolling temperature is 850-920 ℃, the rolling reduction rate in the finish rolling stage is more than 40%, the rolling reduction rate in the final pass is less than 15%, performing laminar cooling after rolling, and cooling to 680-750 ℃ at 5-20 ℃/s for coiling;
(4) Quenching, wherein the quenching heating temperature is 780-850 ℃, and water cooling is carried out to a temperature below 200 ℃;
(5) Tempering, wherein the tempering temperature is 470-530 ℃.
Mechanical property tests are carried out on the tempered examples A1-5 and B1-B9, inclusions are rated according to the specification of GB/T10561-2005, and whether the standards of nonmetallic inclusion is less than or equal to 1.0 level or not is judged, and according to ISO1099: the fatigue characteristics were evaluated by the regulation and evaluation of 2006, and the specific results are shown in Table 3.
TABLE 1
TABLE 2
TABLE 3 Table 3
As can be seen from the test results in Table 2, examples A1 to A5 were high in strength, toughness and hardness, satisfactory in inclusion control, excellent in fatigue resistance, and satisfactory in terms of the steel for a circular saw blade substrate according to the present application. The control of the trace elements Ca, mg, al, RE in comparative examples B1, B6, B7, and B9 was not satisfactory, and the number of inclusions exceeding the control standard was caused to be poor in toughness and fatigue property. The comparative example No. B2 has too high C content, and although higher hardness can be obtained, the yield strength and toughness cannot be satisfied. The Si content in comparative examples B4 and B8, and the Nb content in B3 and B5 were insufficient to satisfy the requirements, and steel for circular saw blade base body satisfying the requirements could not be obtained.
The components of comparative examples B51 to B53 are the same as in example A5, but the preparation process is different, see in particular Table 4. The test results are shown in Table 5.
TABLE 4 Table 4
TABLE 5
In B51, the excessively low finishing temperature is adopted, so that the internal defects of the plate blank are increased, and the overall performance of the product is reduced. B52 has a lower tempering temperature, and thus has a higher hardness, but the toughness and fatigue strength are not satisfactory. In B53, the tempering temperature is too high, carbide coarsens, and toughness is remarkably reduced.
While the application has been described above by way of example, it will be apparent that the application is not limited to the above embodiments, but is capable of modification in various ways, or in other applications without modification, of carrying out the inventive method and its technical solutions, all falling within the scope of the application.
Claims (7)
1. A steel for a circular saw blade substrate, characterized in that:
the composition comprises the following components in percentage by mass:
c:0.42-0.50%, si:1.10-1.40%, mn:1.20-1.50%, cr is less than or equal to 0.20%, nb:0.1-0.25%, mg:0.005-0.03%, al <0.001%, ca:0.005-0.06%, RE:0.03-0.08%, P is less than or equal to 0.010%, S is less than or equal to 0.010%, N is less than or equal to 0.0080%, O is less than or equal to 0.0020%, H is less than or equal to 0.0004%, and the balance is Fe and unavoidable impurity elements;
the tensile strength of the steel reaches more than 1400MPa, the yield strength reaches more than 1200MPa, the Brinell hardness reaches 420-460, the elongation is more than or equal to 12%, and the Charpy V-shaped longitudinal impact energy Akv at room temperature is more than or equal to 65J.
2. The steel for a circular saw blade base body according to claim 1, wherein: the tempered steel structure is tempered sorbite.
3. The steel for a circular saw blade base body according to claim 1, wherein: the nonmetallic inclusion in the steel is less than or equal to 1.0 level.
4. A method for producing steel for a circular saw blade base body according to claim 1, characterized in that: the method comprises the following steps:
(1) Smelting and casting, converter-LF refining-sheet billet continuous casting;
(2) Bao Zhupi, heating the thin casting blank to 1100-1180 ℃, and preserving heat for 25-40min;
(3) Rolling, namely performing two-stage hot rolling, wherein the rough rolling temperature is 940-1100 ℃, the finish rolling temperature is 850-920 ℃, the rolling reduction rate in the finish rolling stage is more than 40%, the rolling reduction rate in the final pass is less than 15%, performing laminar cooling after rolling, and cooling to 680-750 ℃ at 5-20 ℃/s for coiling;
(4) Quenching, wherein the quenching heating temperature is 780-850 ℃, and water cooling is carried out to a temperature below 200 ℃;
(5) Tempering, wherein the tempering temperature is 470-530 ℃.
5. The method for producing steel for a circular saw blade base body according to claim 4, characterized by: in the step (1), aluminum-free ferrosilicon and ferromanganese are added in the tapping process after the converter for pre-deoxidation, and Ca-Si wires are added into steel for deoxidation and Ca-Mg alloy is added for deep desulfurization and deoxidation during LF refining.
6. The method for producing steel for a circular saw blade base body according to claim 5, characterized by: after deep desulfurization and deoxidation of Ca-Mg alloy, mg-RE intermediate alloy is added into steel for modification treatment.
7. The method for producing steel for a circular saw blade base body according to claim 4, characterized by: in the step (1), the thickness of the sheet billet is controlled to be 25-50mm.
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| CN109835014B (en) * | 2017-11-28 | 2021-03-12 | 宝山钢铁股份有限公司 | High-strength high-toughness wear-resistant composite steel plate and manufacturing method thereof |
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