WO2020175665A1 - 鋼板、部材及びそれらの製造方法 - Google Patents
鋼板、部材及びそれらの製造方法 Download PDFInfo
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- WO2020175665A1 WO2020175665A1 PCT/JP2020/008223 JP2020008223W WO2020175665A1 WO 2020175665 A1 WO2020175665 A1 WO 2020175665A1 JP 2020008223 W JP2020008223 W JP 2020008223W WO 2020175665 A1 WO2020175665 A1 WO 2020175665A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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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- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- 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
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the present invention relates to a steel sheet, a member excellent in cold workability, hardenability, and surface hardness after quenching, and a manufacturing method thereof.
- the total content of one or more of these is 0.002 to 0.03%, and the balance is 6 and inevitable impurities, and the proportion of the amount of solid solution to the total amount of the mineral is 70% or more. It has a microstructure consisting of ferrite and carbide, and has a carbide density within the ferrite grains of less than 0.08 pieces/ 2 , hardness of 73 or less, and total elongation of 39% or more.
- a high carbon hot-rolled steel sheet is described which is characterized by being present.
- Patent Document 2 in mass%, 0: 0.10 to ⁇ .70%, 3 I: 0.01 to 1.0%, ⁇ -1 to 3.0%, 9: ⁇ .001 to ⁇ .025
- Ding 1 ⁇ .01 to ⁇ .20%, 01 to 1.50%, 1 ⁇ /1 ⁇ : ⁇ .01 to 0 50%, M: ⁇ .0001 to ⁇ .01 0%,: ⁇ 0 ⁇ 02020/175665 2 (:171? 2020/008223
- the (1 1 0) plane is within ⁇ 5° parallel to the surface of the steel sheet, and the degree of integration of crystal orientation is 2.5 or more, which is excellent in punchability.
- High carbon hot rolled steel sheets have been proposed.
- Patent Document 1 Re-Table 201 5-1 46 1 73
- Patent Document 2 JP 2015 _ 1 1 7406 JP
- Patent Document 2 the (1 1 0) plane of the body-centered cubic lattice of iron is
- the punchability is improved by controlling the degree of integration of crystallographic orientations within 2.5° to 2.5 or more. However, there is no description about hardness after quenching or surface hardness after quenching.
- the present invention solves the above problems and aims to provide a steel sheet, a member having excellent cold workability, hardenability, and surface hardness after quenching, a member, and a method for producing them, which solves the problem.
- the steel sheet has a predetermined composition, and the ferrite and the carbide in the microstructure satisfy a predetermined relationship, whereby cold workability and quenching are performed.
- the present invention has been made on the basis of the above findings and has the following gist.
- M n 0.40% or more and 1.25% or less
- N 0.01% or less
- ⁇ having a composition of 0.5% or more and 1.50% or less, the balance being 6 and inevitable impurities, and a microstructure containing ferrite and carbide,
- the volume ratio of the ferrite and carbide to the entire microstructure is 90% or more, and the volume ratio of the pro-eutectoid ferrite to the entire microstructure is 20% to 80%.
- the concentration of IV! n in the carbide is not less than 0.10 mass% and not more than 0.50 mass%, and the ratio of the number of carbides having a particle size of 1 or more to the total number of the carbides is 30 Steel plate that is between 60% and 60%.
- composition of the components is as follows: Includes at least one of _, _, _, and 36 of _ 0.002% to _ 0.03%
- composition of the components is further: ⁇ 1 One or more of IV! ⁇ 0 2020/175665 4 (:171? 2020/008223
- the above component composition further contains, in mass %, one or more of N 13, and V in total of 0.001% to 0.05%.
- [1] [4] The steel sheet according to any one of the above.
- a steel material having the chemical composition according to any one of [1] to [5] is hot-rolled roughly, and then finish-rolled at a finishing temperature of 920 ° or less to obtain the finish. After cooling from the temperature to 700 ° ⁇ at an average cooling rate of 50 ° ⁇ / 3 or less,
- Coiling temperature wound at 5 5 0 ° ⁇ As 7 0 0 ° ⁇ below with respect to the entire microstructure, the ratio of the volume occupied by the particle diameter of 3 or more pro-eutectoid ferrite 2 0% or more 80% or less And then
- Annealing temperature 700° or more ⁇ ⁇ ! A method of manufacturing steel sheet that is annealed below the transformation point.
- a steel material having the composition as described in any one of [1] to [5] is hot-rolled roughly, and then finish-rolled at a finishing temperature of 920 ° or less to obtain the finish. After cooling from the temperature to 700 ° ⁇ at an average cooling rate of 50 ° ⁇ / 3 or less,
- Coiling temperature wound at 5 5 0 ° ⁇ As 7 0 0 ° ⁇ below with respect to the entire microstructure, the ratio of the volume occupied by the particle diameter of 3 or more pro-eutectoid ferrite 2 0% or more 80% or less And then
- [8] A member obtained by subjecting the steel sheet according to any one of [1] to [5] to at least one of forming and heat treatment.
- the present invention has excellent cold workability, hardenability, and surface hardness after quenching. ⁇ 02020/175665 5 (:171? 2020 /008223
- the steel sheet of the present invention is excellent in cold workability, hardenability, and surface hardness after quenching, the material steel sheet is required to have cold workability and quenching hardness after heat treatment.
- Gears, missions, sheet recliners It can be suitably applied to automobile parts such as.
- ⁇ is an important element for obtaining the strength after quenching. If the 0 content is less than 0.1%, the desired hardness cannot be obtained by the heat treatment after molding into the shape of the component. Therefore, the 0 content is set to 0.1% or more. From the viewpoint of obtaining a larger Pickers hardness (1 to 1) after the heat treatment at the position of 1/4 (1/41:) of the plate thickness, it is preferable that the content of O is 0.18% or more. On the other hand, if the content of O exceeds 0.33%, the material becomes hard and the toughness and cold workability deteriorate. Therefore, ⁇ content should be ⁇ . 33% or less. When it is used for parts that require strong working, it is preferable to set it to 0.28% or less from the viewpoint of ensuring cold workability.
- 3 I is an element that has the effect of suppressing softening associated with tempering, and increases strength by solid solution strengthening. 3 As the content increases, it hardens and the cold workability deteriorates, so the content of 3% is ⁇ .50% or less, preferably ⁇ .
- the content of 3 g is at least 0.01%, preferably at least 15%. ..
- IV! n is an element that improves the hardenability and increases the strength by solid solution strengthening. If the Mn content exceeds 1.25%, a band structure develops due to Mn segregation and the structure becomes non-uniform, resulting in poor cold workability. Therefore, the IV!n content is 1.25% or less, preferably 1.00% or less. On the other hand, if the IV! n content is less than 0.40%, the hardenability begins to deteriorate, so the IV! n content is ⁇ .40% or more, preferably ⁇ .50% or more.
- the content is an element that reduces cold workability and toughness after quenching. If the content exceeds 0.03%, grain boundary embrittlement occurs, and the toughness after quenching deteriorates. Therefore, the content should be 0.03% or less. In order to obtain excellent toughness after quenching, the content is preferably 0.02% or less. The smaller the content, the better, but if the content is excessively reduced, the refining cost increases, so the content is preferably 0.002% or more.
- the content of 3 should be 0.01% or less.
- the 3 content is preferably 0.005% or less. The smaller the 3 content is, the more preferable, but if the 3 content is excessively reduced, the refining cost increases, so the 3 content is preferably 0.0002% or more.
- the content of 30 0.8% is to be 0.10% or less, preferably 0.06% or less. Since 8 I forms alumina-based inclusions in molten steel and causes nozzle clogging during casting, it is preferable that the content of 30 I .8 I is small. ⁇ 02020/175665 7 (:171? 2020/008223
- the content of 30 1.8 I is preferably 0.001% or more.
- N 0.01% or less
- the 1 ⁇ 1 content is ⁇ .01% or less, and preferably ⁇ .0050% or less.
- 1 ⁇ 1 forms 8 I 1 ⁇ 1, ⁇ series nitrides and IV! ⁇ series nitrides, which appropriately suppress the growth of austenite grains during heating during quenching treatment.
- the 1 ⁇ 1 content is preferably 0.0005% or more.
- ⁇ " 0.50% or more 1.50% or less
- ⁇ is an important element that enhances hardenability, When the content is less than 0.50%, sufficient effect is not observed, so the content is 0.50% or more, preferably 0.70% or more. On the other hand, if ⁇ “ exceeds 1.50%, the steel sheet before quenching will be hardened and cold workability will be impaired. Therefore, it is set to 50% or less. High workability, which is difficult to press forming, is required. Since it is necessary to further improve the cold workability when processing the parts to be used, 1.25% or less is preferable, and 1.20% or less is more preferable.
- Min 0% or more and 0.01% or less
- Minami is an important element that enhances hardenability, and it is preferable to add 0.01% or less. If the Mn content exceeds 0.01%, recrystallization of the austenite after finish rolling is delayed. As a result, the rolling texture of the hot-rolled steel sheet develops, and the in-plane anisotropy of the mechanical properties of the annealed steel sheet increases. As a result, ears are likely to occur in the draw forming, and the roundness is lowered, and problems are likely to occur during the forming. For this reason, when it is contained, it is preferable to set the content of TiO to 0.01% or less. Since the effect of the present invention can be obtained even when 0% is set, ⁇ 02020/175665 8 ⁇ (: 171? 2020 /008223
- the Titanium content is less than 0.0005%, the solid solution T content that delays the ferrite transformation is insufficient. There is a possibility that it may not be possible to obtain a sufficient hardening effect. Therefore, when it is contained, it is preferable that the content of Mitsumi is 0.0005% or more, and more preferably 0.001% or more.
- 31-1, Min 06, 7 e s 3 ⁇ is an important element for suppressing nitriding from the surface layer. If the total content of one or more of these elements is less than 0.002%, sufficient effects cannot be observed. Therefore, when it is contained, the total content is preferably 0.002% or more, and more preferably 0.005% or more. On the other hand, even if the total content of these elements exceeds 0.03%, the effect of preventing nitrification is saturated. In addition, these elements tend to segregate at the grain boundaries, and if the total content of these elements exceeds 0.03%, the content may become too large and cause grain boundary embrittlement. ..
- the total of at least one of 3, Sn, Min, 6, 6, 6 is 36% or less, more preferably 0.02% or less. Further, since the nitriding can be suppressed in this manner, when the steel sheet contains a mitani, it has an effect of suppressing the formation of nitrides by the solid solution mitts, which contributes to the improvement of hardenability. is there.
- ⁇ is an important element that enhances the hardenability. ⁇ “If the content alone does not provide sufficient hardenability, the hardenability is improved. It also has the effect of suppressing temper softening resistance. In order to obtain such effects, the total content, if contained, is preferably 0.01% or more, more preferably 0.1% or more. If more than 0.5% of one or more of 1 ⁇ /10 is contained in total, the steel plate before hardening may be hardened and cold workability may be impaired. It is preferable to be less than 0.5%. ⁇ 02020/175665 9 (:171? 2020/008223
- Tingyo and V in total is 0.001% or more and 0.05% or less
- Ding and V contribute to the improvement of wear resistance by forming a nitride with 1 ⁇ 1, and in the case where the steel sheet contains Mitsu, the solid solution that contributes to the improvement of hardenability is It has the effect of suppressing the formation of nitride as ⁇ 1.
- the total content is preferably 0.001% or more.
- the total content of one or more of Gyoza and V exceeds 0.05% in total, precipitates such as carbides may be generated, and the steel plate before hardening may become hard and impair cold workability. Therefore, it is preferable that the total amount be 0.05% or less, and more preferable that the total amount be 0.03% or less.
- the balance other than the above components is composed of 6 and inevitable impurities.
- the optional components included below the lower limit are included in the unavoidable impurities. Inevitable impurities are 0: 0.005% or less and IV! 9: 0.003% or less. Further, as a component that does not impair the effects of the present invention, it can contain 0.04% or less.
- the steel sheet of the present invention has a microstructure containing ferrite and carbide.
- the volume ratio of ferrite and carbide to the entire microstructure is 90% or more.
- the cold workability and the punchability are impaired. Is 90% or more, preferably 95% or more.
- the volume ratio of the pro-eutectoid ferrite in the entire microstructure is 20% or more.
- the pro-eutectoid ferrite in the present invention means a ferrite in which the volume ratio of the carbide in the crystal grains is less than 5%.
- the proeutectoid ferrite is a ferrite that is substantially free of carbides and is precipitated as a primary crystal in the cooling process after hot rolling, and contributes to improving the cold workability of steel sheets.
- the proportion of the volume of the pro-eutectoid ferrite in the entire structure is 20% or more, preferably 25% or more.
- the volume ratio of the pro-eutectoid ferrite in the entire structure exceeds 80%, secondary phases such as perlite and bainite are formed in the microstructure after hot rolling, and carbides after annealing are formed. Distribution becomes uneven, and the hardness distribution after quenching becomes uneven. Therefore, the volume ratio of the pro-eutectoid ferrite in the whole structure is 80% or less, preferably 60% or less.
- the concentration of IV! n in the carbide is 0.10 mass% or more and 0.50 mass% or less, and the ratio of the number of carbides having a particle size of 1 or more to the total number of carbides Is 30% or more and 60% or less
- the “concentration of IV! in carbide” in the present invention is an average concentration of IV! in carbide, and can be measured, for example, by the method described in Examples.
- the IV! n concentration in the carbide and the grain size of the carbide have a correlation with the surface hardness after quenching. If IV! n is concentrated in the carbide and the particle size of the carbide is sufficiently large, it becomes difficult for the carbide to dissolve during heating during heat treatment after the part is molded, and some undissolved carbide is likely to occur. The presence of undissolved carbides in the steel sheet surface layer improves the hardness of the surface layer after quenching. In order to obtain such effects, the concentration of IV!
- the concentration of IV! n in the carbide is preferably 0.15% by mass or more.
- the ratio of the number of carbides having a grain size of 1 or more to the total number of carbides is preferably 35% or more.
- the M n concentration should be 0.50 mass% or less, and the ratio of the number of carbides with a grain size of 1 or more to 60% or less with respect to the total number of carbides. IV! n concentration in carbide ⁇ 0 2020/175 665 1 1 ⁇ (: 171? 2020 /008223
- the ratio of the number of carbides having a grain size of 1 or more to the total number of carbides is preferably 50% or less, more preferably 40% or less.
- the steel sheet of the present invention is obtained by hot-rolling a steel material having the above-described composition and then finishing rolling at a finishing temperature of 920° or less, and from the finishing temperature to 750° After cooling at an average cooling rate of 3/3 or less, the coiling temperature: 5500° ⁇ or more and 750°° or less, and the primary microferrite with a grain size of 3 or more occupies the entire microstructure. It is manufactured by setting the volume ratio to be 20% or more and 80% or less, and then annealing.
- Annealing can be performed by the following (1) or (2).
- Annealing temperature at least 700 ° ⁇ and annealed at less than ⁇ 1 transformation point.
- the plate thickness of the steel sheet of the present invention is not particularly limited, but 1.0
- the temperature shown in the manufacturing method means the surface temperature of a steel material, a steel plate, or the like.
- the method for manufacturing the steel material is not particularly limited.
- Both a converter and an electric furnace can be used for melting the steel of the present invention.
- the steel thus melted is made into a slab by ingot ingot lump rolling or continuous casting.
- the slab is usually heated and then hot-rolled (hot rough rolling and finish rolling).
- hot-rolled it is preferable to set the slab heating temperature to 1280° or less in order to avoid deterioration of the surface condition due to scale.
- finish rolling since finish rolling is performed at a predetermined temperature, the material to be rolled may be heated by a heating means such as a sheet heater while hot rolling.
- Finishing temperature Finish rolling at 920 ° ⁇ or less ⁇ 02020/175665 12 (:171?2020/008223
- the finishing temperature is 920 ° or less, preferably 915 ° or less.
- the lower limit is not specified, but the finishing temperature is preferably 800 ° C or higher from the viewpoint of reducing the rolling load during rough rolling.
- the finishing temperature is the surface temperature of the steel sheet.
- the temperature range from the finishing temperature to 700°C or higher is the temperature range in which IV! n can easily diffuse.By gradually cooling this temperature range, And (3 “can be concentrated. If the average cooling rate in this temperature range exceeds 50 ° ⁇ /3, the above effect becomes insufficient and the average cooling rate becomes 50 ° ⁇ /3.
- the average cooling rate is preferably 40 ° ⁇ /3 or less, and the lower limit of the average cooling rate is not particularly limited, but from the viewpoint of suppressing excessive diffusion of IV! It is preferably 20° ⁇ /3 or more.
- Winding temperature 5 5 0.0 or more 7 0 0. 0 or less
- the hot-rolled steel sheet after finish rolling is wound into a coil shape. If the coiling temperature is too high, the strength of the hot-rolled steel sheet becomes too low, and when coiled into a coil shape, it may be deformed by the weight of the coil, which is not preferable for operation. Therefore, the take-up temperature is not more than 700° and preferably not more than 680°. On the other hand, if the coiling temperature is too low, a sufficient amount of proeutectoid ferrite cannot be obtained, and the hot-rolled steel sheet becomes hard, which is not preferable. Therefore, it is assumed that the coiling temperature is 5500 ° or more, preferably 5800° or more.
- the coiling temperature is in the temperature range of 580 ° ⁇ to 680°°
- the average cooling from 70°° to the coiling temperature is necessary to obtain stable proeutectoid ferrite. It is preferable that the speed is 40° or less.
- the stripping temperature is the surface temperature of the steel sheet.
- the volume ratio of the pro-eutectoid ferrite with a grain size of 3 or more to the entire microstructure is 20% or more and 80% or less.
- the volume ratio of proeutectoid ferrite with a grain size of 3 or more is 20% or more, and preferably 25% or more, with respect to the entire microstructure of the steel sheet after hot rolling.
- the microstructure after hot rolling contains secondary phases such as perlite and bainite. Occurs, the distribution of carbides after annealing becomes uneven, and the hardness distribution after quenching becomes uneven.
- the volume ratio of the pro-eutectoid ferrite with a grain size of 3 or more to the entire microstructure is 80% or less, preferably 60% or less.
- the volume ratio of the proeutectoid ferrite with a grain size of 3 or more to the entire microstructure is within the range of the present invention. Can be adjusted to.
- annealing is performed under the following annealing conditions (1) or (2).
- Annealing condition (1) Annealing temperature is more than 700 ° ⁇ ⁇ ! Annealing below transformation point
- Annealing is performed on the hot-rolled steel sheet obtained as described above. If the annealing temperature is higher than the 0 1 transformation point, austenite is generated and a coarse perlite structure is formed in the cooling process after annealing, resulting in a non-uniform structure. For this reason, the annealing temperature should be below the 0 1 transformation point.
- the number density of the carbide grains in the ferrite grains in terms of the desired value, the annealing temperature is 7 0 0 ° ⁇ As, is favored properly is 7 1 0 ° ⁇ As.
- any of nitrogen, hydrogen, and a mixed gas of nitrogen and hydrogen can be used, and it is preferable to use these gases, but it is also possible to use “8”, and the annealing time is not particularly limited.
- the time it is preferable to set the time to 0.5 to 40 hours Since the target microstructure can be stably obtained, and the hardness of the steel sheet can be set to a predetermined value or less, the annealing time is 0.5 hours. Further, it is preferable to set the annealing time to 8 hours or more, and it is more preferable to set the annealing time to more than 40 hours. ⁇ 0 2020/175 665 14 ⁇ (: 171? 2020 /008223
- the annealing time is preferably 40 hours or less, and more preferably 35 hours or less.
- the annealing temperature is the surface temperature of the steel sheet. Further, the annealing time is the time for maintaining a predetermined temperature.
- Annealing condition (2) after heating to a temperature of not less than 80 transformation points and not more than 800 ° ° and held for not less than 0.5 hours, Cool down to below the transformation point and hold at least 700 ° ⁇ and hold for more than 20 hours below the transformation point
- the above hot rolled steel sheet By heating to a temperature not lower than the transformation point and not higher than 8000 ° ⁇ and holding it for 0.5 hours or longer, the relatively fine carbides that had precipitated in the hot-rolled steel sheet were dissolved, and the amount of solid solution was large. Generated in part by the austenite. On the other hand, the ferrite remaining without being transformed into austenite is annealed at high temperature, so the dislocation density decreases and it softens. In addition, relatively coarse carbides (undissolved carbides) that did not dissolve remain in the ferrite, but become coarser due to Ostwald ripening.
- the annealing temperature is less than eighty 1 transformation point, because the austenite transformation has not occurred, can not be a solid solution of carbides in the old Sutenai door. Therefore, the annealing temperature is ⁇ 1 transformation point or higher, preferably when it. Annealing temperature exceeds 8 0 0 ° ⁇ a ( ⁇ 1 transformation point + 1 0 ° ⁇ than on, is that to produce coarse austenite Therefore, in the subsequent cooling process, the pearlite is generated without spheroidization of the saustenite region, and the cold workability is deteriorated.Therefore, the annealing temperature is not less than 800 ° C, preferably 7 6 is 0 ° ⁇ below.
- the holding time in the eighty 1 transformation point or more 8 0 0 ° ⁇ following temperature ⁇ . in less than 5 hours it is impossible to sufficiently dissolve the fine carbide. the Therefore, and it is held by heating pressurization to eighty 1 transformation point or above 8 0 0 ° ⁇ below a temperature of 0. 5 hours or more, yet preferably be held for more than one hour.
- the annealing temperature is less than 700 ° C, the growth of carbides will be insufficient. Therefore, the annealing temperature is 700 ° C or higher, preferably 710 ° C or higher. Also, if the annealing temperature is higher than the transformation point, the stainless steel will grow coarsely, and perlite that will cause deterioration of workability during cooling will be formed. Therefore, the annealing temperature is below the transformation point. 7 0 0 ° 0 or more 8 "
- the holding time at the temperature below the transformation point is less than 20 hours, the carbide cannot be grown sufficiently and the cold workability deteriorates. For this reason, the material is cooled to below the transformation point and held for 70000° or more and “below 1 transformation point for 20 hours or more.
- the holding time is preferably 25 hours or more.
- any of nitrogen, hydrogen, and a mixed gas of nitrogen and hydrogen can be used, and it is preferable to use these gases, but 8 "may be used and is not particularly limited.
- the member of the present invention is obtained by subjecting the steel sheet of the present invention to at least one of forming and heat treatment. Further, the method for producing a member of the present invention has a step of subjecting the steel sheet produced by the method for producing a steel sheet of the present invention to at least one of forming and heat treatment.
- the steel sheet of the present invention is excellent in cold workability, punchability and hardenability. Further, the member obtained by using the steel sheet of the present invention is excellent in wear resistance because the hardness of the steel sheet surface layer after quenching is excellent. Further, when punching is performed in manufacturing a member, the life of the tool (die) used in punching can be extended.
- the member of the present invention can be suitably used for automobile parts such as gears, missions, and seat recliners.
- general processing methods such as press working and punching can be used without limitation.
- heat treatment general heat treatment methods such as induction hardening, carburizing and quenching, quenching, and tempering applied to carbon steel for machine structures and alloy steel for machine structures can be used without limitation.
- the 80 1 transformation points and 8 " 1 transformation points shown in Table 1 were determined as follows. Using a Formaster testing machine, a cylindrical test piece (diameter 3 111 111 x height 1 0 01 111) is used to measure the expansion curve during heating, and the temperature (8 Transformation point). In addition, using the same test piece, after heating to the saustenite single-phase region, the expansion curve was measured when the saustenite single-phase region was cooled to room temperature, and the saustenite-ferrite and carbide were measured. The temperature at which the transformation to (transformation point) was completed was determined.
- the microstructure of the cross section in the rolling direction was observed.
- the hot-rolled steel sheet is subjected to the image analysis process described later on the scanning electron micrograph, and the volume fraction of the residual structure other than the ferrite and the carbide (hereinafter also simply referred to as the residual structure) and the pro-eutectoid ferrite.
- the particle size and the volume ratio of the pro-eutectoid ferrite with a particle size of 3 or more were obtained.
- the hot-rolled annealed sheet was subjected to the image analysis process described later on the scanning electron micrograph, and the volume fraction of the residual structure and the fraction of the pro-eutectoid ferrite (the volume of the pro-eutectoid ferrite occupying the entire microstructure were determined). , And the ratio of the number of carbides having a grain size of 1 or more to the total number of carbides. For each value, the arithmetic mean value of the values obtained by performing image analysis processing on scanning electron micrographs of three different visual fields was used.
- the scanning electron micrograph was binarized using the image analysis software for the ferrite, the carbide, and the residual structure, and the ratio of the area of the residual structure to the total area was determined by the ferrite. And the volume fraction of the remaining structure other than carbide. The value obtained by subtracting the volume fraction (%) of the remaining structure from 100% was taken as the ratio (%) of the volume of the ferrite and the carbide to the entire microstructure.
- the pro-eutectoid ferrite grain size of the hot-rolled steel sheet a value measured by using the grain size evaluation method (cutting method) defined in "" is used.
- the area ratio of the pro-eutectoid ferrite with a grain size of 3 or more was measured by image analysis software, and this measured value was used to determine the volume occupied by the pro-eutectoid ferrite with a grain size of 3 or more with respect to the entire microstructure. Used as a percentage.
- the volume ratio of the pro-eutectoid ferrite in the hot-rolled and annealed plate to the entire structure was determined by using the image analysis software to determine the area ratio of the pro-eutectoid ferrite with respect to the scanning electron micrograph of the hot-rolled and pure plate. The measured value was used.
- the ratio of the number of carbides having a particle size of 1 or more to the total number of carbides was determined by performing binary processing on the scanning electron micrographs using the image analysis software for the ferrite and the carbide.
- the equivalent circle diameter of each carbide was obtained using image processing software "01 39", and the number of carbides with a grain size of 1 or more was divided by the total number of carbides. ⁇ 02020/175665 18 ⁇ (: 171? 2020/008223
- the hot rolled annealed plate was subjected to constant current electrolysis at a current density of 20 8 / ⁇ 2 in 10 V ⁇ I% acetylacetone _ 11033% tetramethylammonium chloride-methanol electrolyte. Then, the test piece was taken out of the electrolytic solution, transferred to a beaker containing methanol, and the precipitate adhering to the sample surface was completely removed by ultrasonic agitation, and was collected using a filter with a hole diameter of 0.2. The concentration (mass %) of IV! contained in the precipitate was obtained by performing inductively coupled plasma emission spectroscopy on this extraction residue, and it is shown in Table 2-2.
- a member is manufactured by subjecting the hot-rolled and annealed sheet to shearing, and the member is heated in a salt bath at 925 ° After keeping the sardine isothermal, water cooling was performed.
- the Vitzkers hardness distribution in the plate thickness direction was measured under a load of 1.0!
- a sample having a Vickers hardness of 1 to 1430 or more at a plate thickness of 1/4 (1/41) was evaluated as a rank, and a sample having a Pickers hardness of 1 to less than 1430 was evaluated as a rank.
- the samples having the evaluation rank were determined to have excellent hardenability.
- from the surface of the steel plate in the thickness direction ⁇ was determined to have excellent hardenability.
- Samples having a Pickers hardness of 1 to 1 450 or more at the position were evaluated as Ranks, and samples having a Pickers hardness of 1 to less than 1 450 were evaluated as Ranks.
- the sample having an evaluation of eight ranks was determined to have excellent surface hardness after quenching.
- the invention examples 1 ⁇ 0.1, 3, 3, 5, 7, 9, 11 ⁇ 1 4, 2 0 ⁇ 2 2, 2 4, 25 are all excellent cold
- the workability, hardenability, and surface hardness after quenching are shown.
- the ratio of carbides of 1 or more was insufficient and the surface hardness after quenching was poor.
- Comparative Example N 0.26 since the annealing temperature was at or above the transformation point, a large amount of parley was formed, and the number of carbides with a grain size of 1 or more increased excessively, resulting in cold workability. The hardenability and surface hardness after quenching were poor.
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Abstract
Description
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JP2020533307A JP6819829B1 (ja) | 2019-02-28 | 2020-02-28 | 鋼板、部材及びそれらの製造方法 |
KR1020217026800A KR102597734B1 (ko) | 2019-02-28 | 2020-02-28 | 강판, 부재 및 그들의 제조 방법 |
MX2021010394A MX2021010394A (es) | 2019-02-28 | 2020-02-28 | Lamina de acero y miembro, y metodos para fabricar los mismos. |
CN202080016975.7A CN113490756B (zh) | 2019-02-28 | 2020-02-28 | 钢板、构件和它们的制造方法 |
US17/434,255 US20220154301A1 (en) | 2019-02-28 | 2020-02-28 | Steel sheet and member, and methods for manufacturing same |
EP20762083.2A EP3933055A1 (en) | 2019-02-28 | 2020-02-28 | Steel sheet, member, and methods for producing same |
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JP5076347B2 (ja) * | 2006-03-31 | 2012-11-21 | Jfeスチール株式会社 | ファインブランキング加工性に優れた鋼板およびその製造方法 |
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