WO2014162996A1 - 刃物用鋼及びその製造方法 - Google Patents
刃物用鋼及びその製造方法 Download PDFInfo
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- WO2014162996A1 WO2014162996A1 PCT/JP2014/059119 JP2014059119W WO2014162996A1 WO 2014162996 A1 WO2014162996 A1 WO 2014162996A1 JP 2014059119 W JP2014059119 W JP 2014059119W WO 2014162996 A1 WO2014162996 A1 WO 2014162996A1
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- 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
- C21D9/20—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for blades for skates
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
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- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the present invention relates to steel for knives used for razors and the like, and a method for producing the same.
- martensitic stainless steel containing 12.0 mass% to 14.0 mass% of Cr is widely used as steel for blades such as razors.
- This martensitic stainless steel has a hardness of 620 HV to 650 HV, which is the hardness of a razor blade, by heat treatment of quenching and tempering.
- martensitic stainless steel is superior to high carbon steel in terms of rust prevention and corrosion resistance.
- the martensitic stainless steel for razor mentioned above is usually manufactured by combining hot rolling, cold rolling and annealing, and is supplied to the next process as strip-shaped razor steel.
- the next step after punching, heat treatment of quenching and tempering in a continuous furnace, blade attachment and surface treatment are performed to obtain a product.
- the metal structure after annealing of the martensitic stainless steel is a state in which carbides are dispersed in the ferrite structure.
- the particle size and distribution of the carbide greatly affect the workability and the characteristics of the razor blade after heat treatment.
- Patent Document 1 Japanese Patent No. 3354163 filed by the applicant of the present application as an invention in which the number of carbides is increased and the hardenability is dramatically improved. According to this Patent Document 1, it exceeds 0.55 mass% and 0.73 mass% or less C, 1 mass% or less Si, 1 mass% or less Mn, and 12 mass% to 14 mass% Cr. And a steel for a stainless razor comprising the balance Fe and impurities and having a carbide density of 140 to 600 pieces / 100 ⁇ m 2 in an annealing state in a continuous furnace and excellent in short-time hardenability.
- the carbide density shown in Patent Document 1 is inserted into a continuous furnace in which stainless steel razor strip steel is set to Ac1 or higher, which is the transformation temperature of the steel prior to cold rolling or during cold rolling. It is measured in the annealed state.
- the stainless steel razor steel disclosed in Patent Document 1 described above is capable of dramatically increasing the carbide density and realizing excellent hardenability. If the carbide density shown in the above-mentioned Patent Document 1 can be further improved, further excellent hardenability can be obtained.
- An object of the present invention is to provide a steel for a knife with a greatly improved carbide density and a method for producing the same.
- the inventor anneals a cold rolling material having a predetermined metal composition at or above the Ac1 transformation point, and then performs cold rolling and annealing at or above the Ac1 transformation point a plurality of times. It has been found that the present invention can be improved and realized, and extremely excellent hardenability is satisfied, and the present invention has been achieved.
- the present invention relates to 0.55% by mass to 0.8% by mass of C, 1.0% by mass or less of Si, 1.0% by mass or less of Mn, and 12.0% by mass to 14.0% by mass. %, Cr, balance Fe and inevitable impurities in a metal composition for a blade, wherein the carbide in the ferrite structure of the blade steel is more than 600 and less than 1000 in the region of 100 ⁇ m 2. Steel.
- the present invention is a method for manufacturing a steel for blades, which includes 0.55% to 0.8% by mass of C, 1.0% by mass or less of Si, A method for producing a steel for blades having a metal composition comprising 1.0% by mass or less of Mn, 12.0% by mass to 14.0% by mass of Cr, the balance Fe and unavoidable impurities, comprising: A continuous annealing process in which a material for cold rolling heated above the transformation point is subjected to continuous annealing for 5 minutes to 30 minutes, and a cold rolling process in which the material for cold rolling after the continuous annealing process is cold-rolled. And the continuous annealing step and the cold rolling step after the continuous annealing step are repeated at least twice.
- the carbide density in the ferrite structure of the steel for blades can be improved, it is possible to realize excellent hardenability.
- the carbon (C) content is 0.55% by mass to 0.8% by mass.
- C is an important element that determines the hardness of martensite formed by quenching not only to obtain the carbide density necessary for the present invention but also from the carbide to the matrix (matrix) at the austenitizing temperature during quenching. is there.
- 0.55% by mass or more C is required.
- the upper limit of the C content was set to 0.8 mass%.
- the lower limit of the preferable C content is 0.60% by mass, more preferably 0.63% by mass.
- the upper limit of preferable C content is 0.78 mass%, More preferably, it is 0.75 mass%. This is to obtain the effect of C more reliably.
- the content of silicon (Si) is 1.0% by mass or less.
- Si is an element that dissolves in steel and suppresses softening during low-temperature tempering. If excessively added, it may remain in the steel for blades as hard inclusions such as SiO 2 , which may cause blade chipping or spot rust, so the upper limit of the Si content is 1.0 mass%.
- the content is preferably in the range of 0.1% by mass to 0.7% by mass.
- a more preferable lower limit of Si is 0.15% by mass, and a more preferable upper limit of Si is 0.5% by mass. This is to obtain the effect of Si more reliably.
- Manganese (Mn) content is 1.0 mass% or less. Mn can also be used as an oxygen scavenger during refining, like Si. When Mn exceeds 1.0% by mass, hot workability is deteriorated, so Mn is 1.0% by mass or less. When Mn is used as an oxygen scavenger, Mn remains in the cutlery steel. Therefore, the lower limit of Mn exceeds 0% by mass. A preferable range of Mn is 0.1% by mass to 0.9% by mass. This is because the effect of Mn can be obtained more reliably.
- the chromium (Cr) content is 12.0 mass% to 14.0 mass%. Cr maintains the excellent corrosion resistance of the steel for blades and forms a carbide with C. It is an important element for obtaining Cr-based carbides necessary for the density of carbides in the ferrite structure to be more than 6 pieces / ⁇ m 2 and 10 pieces / ⁇ m 2 or less. In order to obtain the effect of Cr, at least 12.0% by mass of Cr is required. On the other hand, if Cr exceeds 14.0% by mass, the amount of eutectic carbide crystallized increases, and for example, when used in a razor, it causes a chipping of the blade. Therefore, Cr is set in the range of 12.0% by mass to 14.0% by mass. The lower limit of Cr for obtaining the above-mentioned effect of adding Cr more reliably is 12.5% by mass, and the preferable upper limit of Cr is 13.5% by mass. This is because the effect of Cr can be obtained more reliably.
- the elements other than those described above are Fe and inevitable impurities.
- Typical inevitable impurity elements include P, S, Ni, Cu, Al, Ti, N, and O. These elements are in the following ranges. If it is the following ranges, the effect of the element demonstrated above will not be prevented.
- the density of carbides in the ferrite structure is more than 6 pieces / ⁇ m 2 and 10 pieces / ⁇ m 2 or less.
- the said metal structure prescribes
- the steel for blades of the present invention exhibits a form in which carbides are dispersed in a ferrite structure in an annealed state. This is quenched to become martensitic stainless steel.
- the steel for blades of the present invention When the steel for blades of the present invention is used for, for example, a razor, it is quenched and tempered to obtain martensitic stainless steel.
- the carbide in order to increase the productivity by increasing the plate passing speed of quenching, or to easily increase the hardness of the steel for blades even if the plate passing speed is the same as the conventional case, the carbide is rapidly formed at the austenitizing temperature.
- the carbides are rapidly dissolved in iron by quenching. As a result, productivity can be improved and the hardness of the steel for blades can be increased.
- carbonized_material in the ferrite structure of steel for blades is more than 600 and 1000 or less in a 100 micrometer ⁇ 2 > area
- tissue can be increased from 600 pieces in a 100 micrometer ⁇ 2 > area
- the carbide density is determined by a technique of observing and measuring a 100 ⁇ m 2 region of the metal structure with an electron microscope. Specifically, image analysis is performed on an image observed with an electron microscope, and measurement is performed by a method of calculating the number of carbides and the equivalent circle diameter of each carbide. At this time, if the acceleration voltage of the electric microscope becomes excessively high, there is a possibility of detecting carbides existing in the base (matrix). Further, since the resolution deteriorates when the acceleration voltage is excessively lowered, it is preferable to observe the acceleration voltage set to 15 kv. Further, the area to be observed is preferably 100 ⁇ m 2 . This is because even if the carbide density is measured in a region exceeding 100 ⁇ m 2 , no significant difference is observed in the measurement results, and therefore 100 ⁇ m 2 is sufficient for the measurement of the carbide density.
- the maximum size of the carbide is preferably 0.6 ⁇ m or less.
- a high-density carbide of more than 600 and 1000 or less in the region of 100 ⁇ m 2 is used. Therefore, each carbide becomes fine. Further, when the carbide size is excessively large, the sharpness of the cutting edge is lowered when a razor is used, and the hardness of the steel for a knife is not easily hardened. Therefore, the maximum size of the carbide is 0.6 ⁇ m or less. If the maximum size of the carbide is 0.6 ⁇ m or less, it is possible to shorten the quenching time when making the blade, and there is an effect that the productivity of the blade can be improved.
- the maximum size of the carbide is 0.6 ⁇ m or less, there is no variation in performance when the cutting tool is used. Preferably, it is 0.55 ⁇ m or less, more preferably 0.50 ⁇ m or less. This is because the sharpness of the blade edge can be increased when a razor is used.
- the average size of the carbide is preferably 0.05 ⁇ m to 0.3 ⁇ m. Further, in order to obtain hardenability in a short time, it is preferable that each carbide is as small as possible. Therefore, in the present invention, the average size of the carbide is set to 0.05 ⁇ m to 0.3 ⁇ m.
- a scanning electron microscope was used to observe and measure the size and average size of carbides. With respect to an image obtained by observing an observation region of 100 ⁇ m 2 with an accelerating voltage of 15 kv with an electron microscope, image analysis is performed, and the number of carbides and the equivalent circle diameter of each carbide (circumferential circle equivalent diameter) are calculated. And the carbide size was determined. Further, the maximum size of the carbide in the present invention refers to the maximum value of the equivalent circle diameter observed in the carbide in the region of 100 ⁇ m 2 .
- the average size is an average value of equivalent circle diameters of all carbides observed in the observation area of 100 ⁇ m 2 .
- a hot-rolled material having a metal composition consisting of Cr, the remaining Fe and inevitable impurities is used as a material for cold rolling.
- the cold rolling material is heated to the Ac1 transformation point or higher, and then the continuous annealing at the Ac1 transformation point or higher is performed on the cold rolling material for 5 to 30 minutes (continuous annealing step). After the continuous annealing step, the cold rolling material is cold-rolled (cold rolling step).
- the density of carbides in the ferrite structure is obtained by subjecting the material for cold rolling to continuous annealing above the Ac1 transformation point in advance and performing continuous annealing above the Ac1 transformation point between the multiple cold rolling steps. More than 6 pieces / ⁇ m 2 and 10 pieces / ⁇ m 2 or less. For example, in order to set the average size of carbide to 0.05 ⁇ m to 0.3 ⁇ m while setting the maximum size of carbide to 0.6 ⁇ m or less, continuous annealing at least once Ac1 transformation point between cold rolling processes is performed once or more. That is, a more reliable method is to repeat the continuous annealing step and the cold rolling step after the continuous annealing step at least twice.
- the upper limit of the number of continuous annealing performed between the multiple cold rolling processes is not particularly specified, but if the continuous annealing between the cold rolling processes is performed at most 5 times, the density of carbides in the ferrite structure is reduced. Since it is more than 6 pieces / ⁇ m 2 and 10 pieces / ⁇ m 2 or less, the upper limit is 5 times.
- Continuous annealing is performed while passing a steel strip through an annealing furnace heated to a predetermined temperature.
- the predetermined temperature is equal to or higher than the Ac1 transformation point of the steel for blades.
- the continuous annealing time is excessively short, a carbide form in which the density of carbides in the ferrite structure is more than 6 pieces / ⁇ m 2 and 10 pieces / ⁇ m 2 or less cannot be obtained. Minutes. If the continuous annealing time is 30 minutes, the density of carbides in the ferrite structure is more than 6 pieces / ⁇ m 2 and 10 pieces / ⁇ m 2 or less. Even if it exceeds 30 minutes, the effect of further miniaturizing the carbide is not obtained, and there is a possibility that the productivity is lowered due to the long annealing time, so the upper limit of the annealing time is 30 minutes.
- the annealing time for continuous annealing performed between the multiple cold rolling processes is within 10 minutes. This is because if the annealing is performed within 10 minutes, the effect of reducing the size of the carbide can be sufficiently obtained.
- Example 1 For the alloy composition and the thickness of the hot-rolled material, the example of Patent Document 1 was referred to. Table 1 shows the metal composition of the hot-rolled material. The thickness of the hot rolled material was 1.7 mm. Among the metal compositions shown in Table 1, “conventional example” is No. having the highest carbide density among the steels introduced in the examples of Patent Document 1. C steel. Examples are also No. It aims at the same metal composition as C steel.
- the hot-rolled material of Example 1 was used as a material for cold rolling, and after the material for cold rolling was heated to 850 ° C., it was placed in a continuous furnace having a heating zone and subjected to continuous annealing at 850 ° C. for 10 minutes. .
- the Ac1 transformation point of the steel for blades shown in Table 1 is 800 ° C. in both Example 1 and the conventional example.
- the oxide film previously formed on the surface was removed.
- the first cold rolling was performed so that a rolling rate might be 50% or more. Thereafter, the sample was further heated to 850 ° C., subjected to continuous annealing at 850 ° C.
- the second cold rolling was performed so that the rolling rate was 50% or more. Furthermore, after heating to 850 ° C. and performing continuous annealing at 850 ° C. for 10 minutes, the final cold rolling is performed so that the thickness becomes 0.1 mm to produce the steel for a knife of Example 1. did. No defects such as cracks occurred during the cold rolling.
- a conventional method for manufacturing steel for blades will be described.
- a hot rolled material having a metal composition thickness of 1.7 mm shown in Table 1 is placed in a continuous furnace having a heating zone set at 850 ° C. ⁇ 20 minutes, and then annealed, followed by cold rolling—780 ° C. ⁇ 5 minutes.
- the steel for blades having a thickness of 0.1 mm was obtained through the steps of annealing, cold rolling, annealing at 780 ° C. for 5 minutes, and cold rolling.
- Example 1 From the obtained steel for blades of Example 1 and the conventional example, a specimen for carbide density observation was collected, and the carbide density was measured using an electron microscope. The observation surface was flattened by polishing with emery paper, and then was subjected to electrolytic polishing and corrosion with a night liquid to expose the carbides. A scanning electron microscope was used to observe the carbide of the test piece. Measurement conditions were an acceleration voltage of 15 kv, and image analysis was performed on an image observed in an observation region of 100 ⁇ m 2 with an electron microscope. From the image analysis, the number of carbides and the equivalent circle diameter of each carbide were calculated, and the carbide density, carbide size, and average carbide size were determined.
- FIG. 1 shows an electron micrograph of a carbide form observed using the steel for blades of Example 1. Since the carbide density of Example 1 was very high and the size of each carbide was fine, the electron micrograph shown in FIG. As shown in FIG. 1, it can be seen that fine carbides 1 having a maximum size of 0.5 ⁇ m are uniformly dispersed. These carbides were Cr-based carbides when their compositions were confirmed with an energy dispersive X-ray analyzer.
- FIG. 4 shows an electron micrograph of carbide density of a conventional example. The magnification is 4000 times. In FIG. 4, carbides having a size of 1 ⁇ m at the maximum were observed. Moreover, when the carbide density is compared with FIG. 1, it can be seen that the density is low.
- Table 2 shows the carbide densities of Example 1 and the conventional example obtained from the number of carbides in the region of 100 ⁇ m 2 .
- Example 2 (Examples 2 and 3) Next, an experiment was conducted under heat treatment conditions different from those in Example 1.
- the alloy composition and the thickness of the hot-rolled material were 1.7 mm, the same as in Example 1.
- Example 3 The same hot-rolled material as in Example 1 is used as a starting material, and after heating the starting material to 850 ° C., it is placed in a continuous furnace having a heating zone and subjected to continuous annealing at 850 ° C. for 12 minutes. A material for cold rolling was used. Further, a material subjected to continuous annealing at 850 ° C. for 15 minutes was used as the material for cold rolling in Example 3. Next, in order to perform cold rolling, the oxide film previously formed on the surface was removed. And the first cold rolling was performed so that a rolling rate might be 50% or more. Thereafter, the sample was further heated to 850 ° C., subjected to continuous annealing at 850 ° C.
- the second cold rolling was performed so that the rolling rate was 50% or more.
- the final cold rolling was performed so that the thickness was 0.1 mm, and the steel for the cutters of Examples 2 and 3 It was. No defects such as cracks occurred during the cold rolling.
- carbonized_material form observed using the steel for blades of Example 2 is shown in FIG.
- carbonized_material form observed using the steel for blades of Example 3 is shown in FIG.
- the carbide density of the blade steels of Example 2 and Example 3 was very high and the individual carbide sizes were fine.
- the magnification of the electron micrograph shown is a photo of 30000 times.
- FIGS. 2 and 3 it can be seen that the fine carbides 1 having a maximum size of 0.5 ⁇ m are uniformly dispersed. These carbides were Cr-based carbides when their compositions were confirmed with an energy dispersive X-ray analyzer.
- Table 3 shows the carbide densities of Example 2 and Example 3 obtained from the number of carbides in the region of 100 ⁇ m 2 .
- the steel for a knife of the present invention includes more than 600 carbides in a region of 100 ⁇ m 2 , it can be seen that the steel for a knife of the present invention has excellent hardenability.
- the steel for a knife of the present invention is particularly suitable for a razor and is industrially useful. When it is used for a razor, it is good to set it as the thickness of 0.1 mm or less like the above-mentioned Example.
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Abstract
Description
まず、炭素(C)の含有量は、0.55質量%~0.8質量%である。Cは、本発明に必要な炭化物密度とするためだけでなく、焼入れ時オーステナイト化温度において炭化物から基地(マトリックス)に固溶し、焼入れで生成するマルテンサイトの硬さを決定する重要な元素である。刃物用鋼としての十分な硬さを得るため、及び、フェライト組織中の炭化物の密度を6個/μm2より多く、10個/μm2以下とするためには、0.55質量%以上のCが必要となる。また、マルテンサイトステンレス鋼では、CとCrの含有量のバランスにより、凝固時に大型の共晶炭化物が晶出する。刃物用鋼のうち、特に剃刀替刃材のような0.1mm程度の厚さで、しかも鋭利な刃先を有する用途において、このような大型の炭化物が含まれていると、刃欠けの原因となる。このため、Crの含有量とのバランスから、Cの含有量の上限を0.8質量%とした。好ましいCの含有量の下限は0.60質量%であり、更に好ましくは0.63質量%である。また、好ましいCの含有量の上限は0.78質量%であり、さらに好ましくは0.75質量%である。Cが有する効果をより確実に得るためである。
P≦0.03質量%、S≦0.005質量%、Ni≦1.0質量%、Cu≦0.5質量%、Al≦0.1質量%、Ti≦0.1質量%、N≦0.05質量%及びO≦0.05質量%。
従来は、刃物用鋼のフェライト組織中の炭化物が、100μm2の領域中において600個より多いと、冷間圧延に多大の工数を必要とするだけでなく、冷間圧延時の鋼帯の破断の確率も高くなるという認識であった。しかしながら、前述の炭化物形態とすることで、刃物用鋼帯の破断の確率も低いままで炭化物密度を高めることができる。
合金組成と熱間圧延材の厚みは、特許文献1の実施例を参考とした。熱間圧延材の金属組成を表1に示す。また、熱間圧延材の厚みは1.7mmとした。表1に示す金属組成のうち、「従来例」は、特許文献1の実施例にて紹介された鋼の中で、最も炭化物密度の高いNo.C鋼である。実施例もNo.C鋼と同じ金属組成を狙ったものである。
次に、冷間圧延を行うために、予め表面に形成している酸化膜を除去した。そして、圧延率が50%以上となるように最初の冷間圧延を行った。その後、更に、850℃に加熱し、850℃で10分の連続焼鈍を行い、圧延率が50%以上となるように2回目の冷間圧延を行った。更に、850℃に加熱し、850℃で10分の連続焼鈍を行った後、厚さが0.1mmとなるように、最後の冷間圧延を行って、実施例1の刃物用鋼を製造した。冷間圧延途中に、特に割れ等の不良は発生しなかった。
次に、実施例1とは異なる熱処理条件による実験を行った。合金組成と熱間圧延材の厚みは実施例1と同じ1.7mmとした。
次に、冷間圧延を行うために、予め表面に形成している酸化膜を除去した。そして、圧延率が50%以上となるように最初の冷間圧延を行った。その後、更に、850℃に加熱し、850℃で10分の連続焼鈍を行い、圧延率が50%以上となるように2回目の冷間圧延を行った。更に、850℃に加熱し、850℃で10分の連続焼鈍を行った後、厚さが0.1mmとなるように、最後の冷間圧延を行って、実施例2、3の刃物用鋼とした。冷間圧延途中に、特に割れ等の不良は発生しなかった。
Claims (7)
- 0.55質量%~0.8質量%のCと、1.0質量%以下のSiと、1.0質量%以下のMnと、12.0質量%~14.0質量%のCrと、残部Fe及び不可避不純物よりなる金属組成の刃物用鋼であって、前記刃物用鋼のフェライト組織中の炭化物が、100μm2の領域中において600個より多く1000個以下である刃物用鋼。
- 前記刃物用鋼のフェライト組織中の炭化物の密度が6個/μm2より多く、10個/μm2以下である請求項1記載の刃物用鋼。
- 前記炭化物の最大サイズが0.6μm以下である請求項1に記載の刃物用鋼。
- 炭化物の平均サイズが0.05μm~0.3μmである請求項1または請求項2に記載の刃物用鋼。
- 0.55質量%~0.8質量%のCと、1.0質量%以下のSiと、1.0質量%以下のMnと、12.0質量%~14.0質量%のCrと、残部Fe及び不可避不純物よりなる金属組成の刃物用鋼の製造方法であって、
前記金属組成のAc1変態点以上に加熱された冷間圧延用素材に、5分~30分の連続焼鈍を行う連続焼鈍工程と、
前記連続焼鈍工程後の前記冷間圧延用素材を冷間圧延する冷間圧延工程とを含み、
前記連続焼鈍工程と、連続焼鈍工程後の前記冷間圧延工程を少なくとも2回繰り返す、刃物用鋼の製造方法。 - 前記冷間圧延工程の間の前記連続焼鈍工程の連続焼鈍時間は、15分以内である請求項5記載の刃物用鋼の製造方法。
- 0.55質量%~0.8質量%のCと、1.0質量%以下のSiと、1.0質量%以下のMnと、12.0質量%~14.0質量%のCrと、残部Fe及び不可避不純物よりなる金属組成の刃物用鋼の製造方法であって、
前記刃物用鋼用の冷間圧延用素材にAc1変態点以上の温度で連続焼鈍を行った後、複数回の冷間圧延と前記冷間圧延間の連続焼鈍とを行い、前記冷間圧延間の連続焼鈍として、Ac1変態点以上の温度での連続焼鈍を1回以上行い、前記刃物用鋼のフェライト組織中の炭化物密度を100μm2の領域中に600個を超えて1000個以下とすることを特徴とする刃物用鋼の製造方法。
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JPWO2018051854A1 (ja) * | 2016-09-16 | 2019-11-07 | 日立金属株式会社 | 刃物用素材 |
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