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WO2024157714A1 - Matériau de titane et son procédé de fabrication - Google Patents

Matériau de titane et son procédé de fabrication Download PDF

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Publication number
WO2024157714A1
WO2024157714A1 PCT/JP2023/046595 JP2023046595W WO2024157714A1 WO 2024157714 A1 WO2024157714 A1 WO 2024157714A1 JP 2023046595 W JP2023046595 W JP 2023046595W WO 2024157714 A1 WO2024157714 A1 WO 2024157714A1
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WIPO (PCT)
Prior art keywords
titanium material
titanium
vickers hardness
hvs
measured
Prior art date
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Ceased
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PCT/JP2023/046595
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English (en)
Japanese (ja)
Inventor
遼太郎 三好
想祐 西脇
一浩 ▲高▼橋
純一 爲成
篤 栗田
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Nippon Steel Corp
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Nippon Steel Corp
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Priority to EP23918668.7A priority Critical patent/EP4656752A1/fr
Priority to CN202380083170.8A priority patent/CN120303420A/zh
Priority to JP2024519440A priority patent/JP7518462B1/ja
Priority to KR1020257027007A priority patent/KR20250136362A/ko
Publication of WO2024157714A1 publication Critical patent/WO2024157714A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon

Definitions

  • This disclosure relates to titanium materials and methods for producing the same.
  • Press forming is a method of forming metal materials by pressing the material against a die and applying pressure.
  • adhesion between the material and the die can be a problem.
  • lubrication deteriorates and formability decreases. It can also cause scratches on the surface of the material and shorten the life of the die. For this reason, there is a demand for improving adhesion.
  • titanium material Industrially pure titanium or titanium alloy
  • titanium material is a material that is prone to adhesion, i.e., has low lubricity.
  • a chemical called a film-type solid lubricant is usually applied to the surface. This improves lubricity and suppresses adhesion.
  • a film-type solid lubricant is used, an additional process of drying the surface after application and a process of cleaning the surface after press molding are generated. As a result, manufacturing costs increase.
  • a titanium material with good lubricity and low adhesion such as that disclosed in Patent Document 1 has been developed.
  • the titanium material disclosed in Patent Document 1 has a film of TiO2 formed thereon, which has good lubricity.
  • the present disclosure aims to provide a titanium material that has improved lubricity while maintaining its original metallic color.
  • This disclosure has been made to solve the above problems, and is centered on the following titanium material and its manufacturing method.
  • the Vickers hardness HVs of the surface measured under a load of 25 gf satisfies the following formula (i):
  • the relationship between the Vickers hardness HVs and the glossiness Gs measured at an incident angle of 20° satisfies the following formula (ii):
  • a titanium material, wherein the color difference ⁇ E * ab between a surface and a surface after removing 10 to 20 ⁇ m of said surface by pickling with nitric acid satisfies the following formula (iii): HVs ⁇ 200...(i) HVs ⁇ 250-0.25Gs...(ii) ⁇ E * ab ⁇ 3...(iii)
  • a method for producing a titanium material according to (1) above performing cold rolling through multiple passes using a cold rolling oil containing C; performing vacuum annealing or bright annealing; A step of performing a skin pass using a roll polished with abrasive paper of P220 to P800; The average reduction rate in the cold rolling is more than 10%,
  • the average reduction in the cold rolling is in the range of 12 to 20%
  • This disclosure makes it possible to obtain titanium material that has improved lubricity while still maintaining its original metallic color.
  • FIG. 1 is a graph showing the relationship between the C concentration and the depth from the surface of the titanium material of this embodiment.
  • FIG. 2 is a diagram showing the relationship between the surface hardness and glossiness of a titanium material.
  • the inventors conducted extensive research to improve the lubricity of titanium while maintaining its original metallic color, and came to the following findings.
  • the die and titanium material slide with their tiny protrusions in contact with each other.
  • the sliding surface In the vicinity of the surface where the sliding occurs (hereinafter simply referred to as the "sliding surface"), plastic deformation occurs in the titanium material, which is softer than the die.
  • the passive film is very thin and has poor ductility, so it cannot keep up with this plastic deformation. As a result, the passive film is locally destroyed, adhesion occurs, and lubrication is reduced.
  • the titanium material of this embodiment utilizes a passive film formed by natural oxidation on the titanium material surface in order to maintain the original metallic color of titanium while improving lubricity.
  • This passive film is made of TiO2 , which is effective in improving lubricity.
  • the passive film is very thin, about 10 nm, the passive film is destroyed during press molding, and the effect of improving lubricity is usually small. Therefore, the titanium material of this embodiment suppresses the destruction of the passive film during press molding and improves lubricity.
  • the surface Vickers hardness HVs measured under a load of 25 gf satisfies the following formula (i). HVs ⁇ 200...(i)
  • the surface Vickers hardness HVs is set to 200 or more.
  • the surface Vickers hardness HVs is preferably set to 210 or more, and more preferably to 225 or more.
  • the upper limit of the surface Vickers hardness HVs is not particularly limited, but is usually 350.
  • the titanium material of this embodiment has a high surface hardness because it is cold-rolled using cold-rolling oil containing C, as described below. As a result, C is concentrated on the surface, increasing the surface hardness.
  • Figure 1 is a diagram showing the relationship between the C concentration and depth from the surface of the titanium material of this embodiment, and is an analysis result by GDS (glow discharge optical emission spectrometry) showing the change in C concentration near the surface. GDS is an analytical method that can investigate the concentration distribution of specific elements near the surface. It can be seen from Figure 1 that the titanium material of this embodiment has the highest C concentration near the surface, and the C concentration decreases as the depth direction increases from the surface.
  • the Vickers hardness of the surface may be measured using the following procedure. In accordance with JIS Z 2244-1:2020 (Vickers hardness test), the micro Vickers hardness is measured at five points from the surface at 1 mm intervals with a load of 25 gf. The average of the measurements at three points, excluding the maximum and minimum values, is taken as the Vickers hardness of the surface HVs. The load is 25 gf, which is lower than in a normal Vickers test, in order to fully evaluate the hardness of the surface layer (the shallow layer close to the surface).
  • the internal Vickers hardness HVb of the titanium material measured at a load of 500 gf is preferably less than 200, more preferably 180 or less, and even more preferably 160 or less.
  • the Vickers hardness measured at a load of 500 gf is different from that measured at a load of 25 gf, and is the Vickers hardness of the titanium material.
  • the lower limit of the internal Vickers hardness HVb is not particularly limited, but is usually preferably 125 or more.
  • the internal Vickers hardness HVb may be measured using the following procedure. In accordance with JIS Z 2244-1:2020 (Vickers hardness test), measure the micro Vickers hardness at five points from the surface with a load of 500 gf and a pitch of 1 mm. Of the five measured points, the average of the measurements at three points excluding the maximum and minimum values is taken as the internal Vickers hardness.
  • the fine irregularities can be removed by skin pass, which will be described later.
  • the fine irregularities to be evaluated are on the submicron order, it is difficult to evaluate the irregularities using a normal contact roughness test. Therefore, the glossiness Gs measured at an incidence angle of 20° was used to evaluate the fine irregularities.
  • the relationship between the Vickers hardness HVs of the surface and the glossiness Gs measured at an incidence angle of 20° must satisfy the following formula (ii). HVs ⁇ 250-0.25Gs...(ii)
  • formula (ii) is an equation that was experimentally determined.
  • Figure 2 shows the relationship between the surface hardness and glossiness of titanium material. As shown in Figure 2, when formulas (ii) and (i) are satisfied, good lubricity is obtained.
  • the titanium material of this embodiment has a passive film, and the thickness of this film is thought to be approximately 5 to 20 nm.
  • gloss is defined in JIS Z 8741:1997 and can be measured with a gloss meter.
  • measurements are taken at two arbitrary points parallel to the cold rolling direction at an incidence angle of 20°, and the average value is taken as the gloss Gs measured at an incidence angle of 20°.
  • the titanium material of this embodiment has a passive film on the surface. This passive film must be thick enough not to affect the inherent metallic color of the titanium material. For this reason, the titanium material of this embodiment has a color difference ⁇ E * ab between the surface and the surface after removing 10 to 20 ⁇ m by pickling with nitric acid and hydrofluoric acid, which satisfies the following formula (iii). ⁇ E * ab ⁇ 3...(iii)
  • the color difference ⁇ E * ab is an index showing the difference in color. That is, the larger the color difference ⁇ E * ab, the greater the difference in color.
  • the titanium material of this embodiment includes a passive film and a titanium substrate, which is a base portion covered with the passive film.
  • the lower limit of the color difference is not particularly limited, and is most preferably 0.
  • the color difference ⁇ E * ab can be calculated by measuring L * , a * , and b * of the L * a * b * color system, which represents the color tone, on the two surfaces for which the color difference is to be calculated.
  • L * , a * , and b * can be measured using a color difference meter under light source C.
  • L * , a * , and b * are measured on the "surface” and the "surface after removing 10 to 20 ⁇ m of the surface", respectively, and the differences are taken as ⁇ L * , ⁇ a * , and ⁇ b * , and ⁇ E * ab can be calculated from the formula ⁇ ( ⁇ L * ) 2 + ( ⁇ a * ) 2 + ( ⁇ b * ) 2 ⁇ .
  • Type and shape of titanium material The type of titanium material in this embodiment is not particularly limited. That is, titanium material, commercially pure titanium, and titanium alloys may be used. Note that commercially pure titanium is specified by JIS, ASTM, etc., and the Ti content is usually 99 mass% or more.
  • commercially pure titanium include JIS types 1 to 4, or ASTM/ASME Grades 1 to 4.
  • Representative impurity elements in commercially pure titanium are C, H, O, N, and Fe.
  • the contents of the above elements are C: 0.08 mass% or less, H: 0.015 mass% or less, O: 0.40 mass% or less, N: 0.05 mass% or less, and Fe: 0.50 mass% or less.
  • Titanium alloys are generally alloys containing 70% or more by mass of Ti.
  • examples of titanium alloys include ⁇ -type titanium alloys, ⁇ + ⁇ -type titanium alloys, and ⁇ -type titanium alloys.
  • Examples of ⁇ -type titanium alloys include highly corrosion-resistant alloys (titanium alloys specified in JIS standards 11-13, 17, and 19-22, and ASTM standards Grades 7, 11, 13, 14, 17, 30, and 31, as well as titanium alloys containing small amounts of various elements), Ti-0.5Cu, Ti-1.0Cu, Ti-1.0Cu-0.5Nb, and Ti-1.0Cu-1.0Sn-0.3Si-0.25Nb.
  • Ti-0.5Cu is a titanium alloy containing 0.5 mass% Cu
  • Ti-1.0Cu-0.5Nb is a titanium alloy containing 1.0 mass% Cu and 0.5 mass% Nb.
  • the names of titanium alloys usually include the elements contained and their amounts after Ti-.
  • Examples of ⁇ + ⁇ titanium alloys include Ti-3Al-2.5V, Ti-5Al-1Fe, Ti-6Al-4V, etc.
  • Examples of ⁇ titanium alloys include Ti-11.5Mo-6Zr-4.5Sn, Ti-8V-3Al-6Cr-4Mo-4Zr, Ti-13V-11Cr-3Al, Ti-15V-3Al-3Cr-3Sn, Ti-20V-4Al-1Sn, Ti-22V-4Al, etc.
  • the shape of the titanium material is not particularly limited. It may be a plate, a bar, or some other shape.
  • the average friction coefficient was measured by conducting a pin-on-disk type friction and wear test.
  • a pin-on-disk type friction and wear tester is used to slide a pin on the surface of the titanium material to conduct the friction and wear test.
  • Castor (S-803T) is used as the lubricant, and the test is performed under the conditions of a surface pressure of 1 MPa, a speed of 0.1 m/min, and a sliding distance of 10 mm.
  • the pin used in the test is made of high carbon chromium bearing steel SUJ2 specified in the Japanese Industrial Standard JIS G4805:2019, and has a smooth surface of ⁇ 3.5 mm and Ra0.12.
  • the titanium material of this embodiment can be stably manufactured, for example, by the following manufacturing method.
  • a material for hot rolling is prepared.
  • This material may be industrially pure titanium or a titanium alloy, and the type is not particularly limited.
  • the material for hot rolling may be manufactured according to a conventional method. For example, an ingot of titanium material may be manufactured by arc melting or the like, and hot forged to obtain the material for hot rolling.
  • the above-mentioned hot rolling material is hot rolled to produce a hot rolled material.
  • the conditions for hot rolling may be adjusted as appropriate to achieve the desired characteristics.
  • the obtained hot rolled material may be subjected to heat treatment as appropriate.
  • Cold rolling The hot rolled material is then cold rolled.
  • a cold rolling oil containing C is used.
  • mineral oil is used as the cold rolling oil to harden the surface layer.
  • mineral oil By using mineral oil, a mechanochemical reaction occurs during cold rolling. As a result, a C-enriched layer is formed on the surface layer, and the surface layer can be hardened by being carburized during annealing. Note that a commercially available cold rolling oil may be used.
  • Cold rolling is usually performed with a Sendzimir rolling mill.
  • a Sendzimir rolling mill the titanium material is rolled by passing it back and forth multiple times between a pair of work rolls.
  • passing the titanium material through the work rolls of the rolling mill is called a pass.
  • the thickness is usually controlled to the target thickness after multiple passes. In other words, cold rolling is a process that involves multiple passes.
  • the average reduction in each pass of cold rolling except for the final two passes is more than 10%. If the average reduction is less than 10%, the Vickers hardness of the surface layer will be less than 200, and lubricity will decrease. For this reason, the average reduction is more than 10%, preferably 12% or more, and more preferably 16% or more.
  • the number of passes is increased and rolling is generally performed at a low average reduction of 10% or less.
  • the average reduction is set to the above range from the viewpoint of promoting carburization, which will be described later, and hardening the surface layer.
  • the average reduction is preferably 25% or less, and more preferably 20% or less. Note that the average reduction does not include the final two passes because these two passes are performed with the aim of improving the dimensional accuracy of the thickness.
  • Vacuum annealing refers to annealing in a vacuum state inside the furnace.
  • Bright annealing refers to annealing in a non-oxidizing atmosphere.
  • the annealing method may be continuous annealing or batch annealing. In vacuum annealing and bright annealing, oxidation of the surface is suppressed, so a good silver-white metallic color can be obtained.
  • Annealing is performed to promote recrystallization, but is also performed for the purpose of carburizing the surface layer. Specifically, C contained in mineral oil that has been concentrated in the surface layer by a mechanochemical reaction diffuses during annealing, causing carburization. This allows the surface layer to be hardened.
  • the conditions for vacuum annealing and bright annealing are not particularly limited and may be in accordance with conventional methods.
  • the annealing temperature is generally in the range of 580 to 850°C
  • the annealing time is generally in the range of 0.5 min to 24 h.
  • the annealing temperature is in the range of 750 to 850°C and the annealing time is 5 min or less.
  • the degree of vacuum in vacuum annealing may also be in accordance with conventional methods and is preferably, for example, 1 Pa or less, and in the case of continuous annealing rather than batch annealing, it is preferably less than 0.01 Pa.
  • the annealing atmosphere in bright annealing may be an inert atmosphere, and it is usually preferable to use Ar with a purity of 4N or more (99.99% or more). In the case of continuous annealing, it is preferable that the purity of Ar is 5N or more, and for example, the oxygen concentration is preferably 1 vol. ppm or less and the dew point is preferably -50°C or less. Note that if annealing is performed in air, a thick oxide film will form, making it impossible to maintain the silvery-white metallic color of the titanium material.
  • the skin pass refers to a process such as light rolling with a low rolling reduction or drawing.
  • the skin pass is generally performed for the purpose of polishing the surface and correcting distortion, and is also performed in the present application to crush fine protrusions.
  • the skin pass is also a process that involves multiple passes.
  • the number of passes is preferably two or more, more preferably three or more, and even more preferably four or more.
  • the total reduction rate of all passes i.e., the total reduction rate of the skin passes, is preferably in the range of 0.5 to 5.0%. If the total reduction rate of the skin passes is less than 0.5%, it is difficult to crush the convex portions sufficiently, whereas if it exceeds 5.0%, excessive strain is introduced, resulting in reduced formability.
  • Skin pass is performed using a roll that has been polished with abrasive paper of P220 to 800. If a roll that has been polished with abrasive paper coarser than P220 is used, or if brush polishing is used, the lubricity of the surface is likely to decrease. For this reason, the grit of the abrasive paper used to polish the roll is P220 or higher. It is more preferable that the grit of the above abrasive paper is P280 or higher.
  • the grit size of the abrasive paper may exceed P800, but the surface unevenness of a roll polished with P800 abrasive paper is sufficiently small compared to the surface unevenness of titanium. Therefore, even if abrasive paper with a grit size of more than P800 is used, no further improvement in lubricity can be obtained. Furthermore, the higher the grit size of the abrasive paper, the higher the cost of polishing. For these reasons, the grit size of the abrasive paper used to polish the roll is P800 or less.
  • the grit size of the abrasive paper is as defined in JIS R 6010:2000.
  • the skin pass is performed so that the relationship between the reduction amount S per pass and the roll diameter D satisfies the following formula (iv). If the skin pass conditions do not satisfy the following formula (iv), it becomes difficult to satisfy formula (ii), and lubricity decreases. 0.1 ⁇ 10 -5 ⁇ S/D ⁇ 5.0 ⁇ 10 -5 ...(iv)
  • the above S/D in (iv) is preferably 0.5 ⁇ 10 ⁇ 5 or more. This is because it makes it easier to make the average friction coefficient less than 0.15 and further improve lubricity.
  • S/D is preferably 3.0 ⁇ 10 ⁇ 5 or less. This is because it also makes it easier to make the average friction coefficient less than 0.15. That is, in order to make the average friction coefficient less than 0.15, it is preferable to satisfy the following formula (v). 0.5 ⁇ 10 -5 ⁇ S/D ⁇ 3.0 ⁇ 10 -5 ...(v)
  • S and D in the above formula are defined as follows.
  • the reduction amount refers to the amount of reduction (mm) in the thickness of the titanium material.
  • the reduction amount per pass is the total thickness reduction amount divided by the total number of passes in the skin pass. Note that if the total reduction rate in the skin pass is small, at 2% or less, and it is difficult to measure the total thickness reduction amount (mm), the material can be considered to have a constant volume and elongation in the width direction to be 0, and the total thickness reduction amount (mm) can be calculated from the change in length in the rolling direction.
  • a 4mm thick titanium material with the chemical composition shown in Table 1 was prepared. This titanium material was manufactured through hot rolling and other processes. For simplicity, in Table 1, commercially pure titanium is simply referred to as pure titanium.
  • This titanium material was cold-rolled under the conditions shown in Table 2, then batch annealed and skin-passed.
  • the cold rolling was performed using a C-containing cold rolling oil and multiple passes.
  • Comparative Example 13 shows that atmospheric oxidation was performed after vacuum annealing under the conditions in Table 2.
  • Comparative Example 14 shows that atmospheric annealing was performed under the conditions in Table 2 instead of vacuum annealing, and the other examples show that only vacuum annealing was performed.
  • mirror polishing in Table 2 indicates that the titanium surface was polished with colloidal silica.
  • brush polishing in Table 2 indicates that the titanium thin plate after cold rolling was annealed in air at 650°C for 5 hours, then treated (immersed) in salt containing 80% NaOH at a temperature of 520°C for 60 seconds, and then polished using a nylon grinding brush while spraying hot water at 60°C.
  • titanium plate material (hereinafter simply referred to as "titanium plate")
  • the Vickers hardness HVs of the surface layer the Vickers hardness HVb of the interior, the glossiness Gs, the color difference ⁇ E * ab, and the average friction coefficient were measured or calculated according to the following procedures.
  • the average coefficient of friction was measured by conducting a pin-on-disk type friction and wear test.
  • a pin was used in a pin-on-disk type friction and wear tester to slide the surface of the titanium material with a pin, and a friction and wear test was conducted.
  • the lubricant used was Castor (S-803T), a press oil made by Taiyu, diluted four times with water, and the test was conducted under the conditions of a surface pressure of 1 MPa, a speed of 0.1 m/min, and a sliding distance of 10 mm.
  • the pins used in the test were made of SUJ2, a high carbon chromium bearing steel specified in the Japanese Industrial Standard G4805:2019, and had a smooth surface of ⁇ 3.5 mm and Ra0.12. The results are summarized below in Table 3.
  • Invention Examples No. 1 to 32 met the preferred manufacturing conditions and also met the requirements of this embodiment, so they had good lubricity and maintained the metallic color of the titanium material.
  • Comparative Examples No. 1 to 14 did not meet the manufacturing conditions and did not meet the requirements of this embodiment, so at least one of the following occurred: reduced lubricity and inability to maintain metallic color.
  • Nos. 5, 6, 8, 10-12, 15-19, 21-23, 25-28, and 30-32 had average friction coefficients less than 0.15 because the manufacturing conditions were within the more preferable range.
  • Nos. 1, 2, 3, 4, 7, 9, 13, 14, 20, 24, and 29 had average friction coefficients less than 0.20 because the manufacturing conditions did not meet the more preferable range, but they were higher than No. 5 and others.
  • Comparative Examples 1 to 8 the average reduction rate in cold rolling was low, so the surface Vickers hardness HVs was less than 200, and the average friction coefficient was 0.20 or more. Accordingly, Comparative Examples 1 to 5 did not satisfy formula (ii). In Comparative Example 9, the C-enriched layer was removed by surface grinding, so the surface Vickers hardness HVs was less than 200, and the average friction coefficient was 0.20 or more.
  • Comparative examples 10 to 12 did not satisfy formula (iv), and therefore did not satisfy formula (ii), and had an average friction coefficient of 0.20 or more.
  • Comparative example 13 was subjected to atmospheric oxidation after vacuum annealing, and therefore did not satisfy formula (iii), and was unable to maintain its metallic color.
  • Comparative example 14 was subjected to atmospheric annealing, and furthermore, did not undergo skin pass, and therefore had an average friction coefficient of 0.20 or more.
  • the JIS Class 1 commercially pure titanium material shown in Table 1 of Example 1 was used and cold-rolled under the conditions shown in Table 4, after which continuous annealing was performed in an Ar atmosphere. At this time, Ar gas with a purity of 5N or higher was used, the oxygen concentration was 1 vol. ppm or less, the dew point was -50°C or less, and the heating rate to the annealing temperature was 30°C/s. The rest of the information in the table is the same as in Example 1.
  • the obtained titanium plate was measured for the Vickers hardness HVs of the surface layer, the Vickers hardness HVb of the interior, the glossiness Gs, the color difference ⁇ E * ab, and the average friction coefficient in the same manner as in Example 1. The results are summarized in Table 5 below.

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Abstract

Un matériau de titane ayant une dureté Vickers HVs de la surface qui est mesurée à une charge de 25 gf et satisfait la formule (i), ayant une relation entre la dureté Vickers HVa et la brillance Gs qui est mesurée à un angle incident de 20° et satisfait la formule (ii), et ayant une différence de couleur ΔE*ab entre la surface et une surface obtenue par élimination de la surface de 10 à 20 µm par décapage à l'acide nitrique-fluorhydrique satisfait la formule (iii).　(i) HVs ≥ 200 (ii) HVs ≥ 250-0,25 Gs (iii) ΔE*ab < 3
PCT/JP2023/046595 2023-01-23 2023-12-26 Matériau de titane et son procédé de fabrication Ceased WO2024157714A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP23918668.7A EP4656752A1 (fr) 2023-01-23 2023-12-26 Matériau de titane et son procédé de fabrication
CN202380083170.8A CN120303420A (zh) 2023-01-23 2023-12-26 钛材及其制造方法
JP2024519440A JP7518462B1 (ja) 2023-01-23 2023-12-26 チタン材およびその製造方法
KR1020257027007A KR20250136362A (ko) 2023-01-23 2023-12-26 티타늄재 및 그 제조 방법

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013010115A (ja) * 2011-06-29 2013-01-17 Nippon Steel & Sumitomo Metal Corp チタン板、およびその製造方法
JP2014192039A (ja) * 2013-03-27 2014-10-06 Kobe Steel Ltd 燃料電池セパレータ用チタン板材およびその製造方法
WO2018003098A1 (fr) * 2016-06-30 2018-01-04 新日鐵住金株式会社 Feuille de titane et son procédé de fabrication
WO2018008151A1 (fr) * 2016-07-08 2018-01-11 新日鐵住金株式会社 Feuille de titane et son procédé de production
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