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1. (WO2018186273) STEEL MEMBER, HOT-ROLLED STEEL SHEET FOR SAID STEEL MEMBER AND PRODUCTION METHODS THEREFOR
Latest bibliographic data on file with the International BureauSubmit observation

Pub. No.: WO/2018/186273 International Application No.: PCT/JP2018/013076
Publication Date: 11.10.2018 International Filing Date: 29.03.2018
IPC:
C22C 38/00 (2006.01) ,B21B 1/26 (2006.01) ,B21C 37/08 (2006.01) ,C21D 9/08 (2006.01) ,C21D 9/46 (2006.01) ,C21D 9/50 (2006.01) ,C22C 38/14 (2006.01) ,C22C 38/60 (2006.01)
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
B PERFORMING OPERATIONS; TRANSPORTING
21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B
ROLLING OF METAL
1
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
22
for rolling bands or sheets of indefinite length
24
in a continuous process
26
by hot-rolling
B PERFORMING OPERATIONS; TRANSPORTING
21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
C
MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
37
Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
06
of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
08
Making tubes with welded or soldered seams
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
08
for tubular bodies or pipes
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
46
for sheet metals
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
50
for welded joints
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
14
containing titanium or zirconium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
60
containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
Applicants:
JFEスチール株式会社 JFE STEEL CORPORATION [JP/JP]; 東京都千代田区内幸町二丁目2番3号 2-3, Uchisaiwai-cho 2-chome, Chiyoda-ku, Tokyo 1000011, JP
Inventors:
豊田 俊介 TOYODA Shunsuke; JP
杉本 一郎 SUGIMOTO Ichiro; JP
川村 修司 KAWAMURA Shuji; JP
Agent:
熊坂 晃 KUMASAKA Akira; JP
森 和弘 MORI Kazuhiro; JP
井上 茂 INOUE Shigeru; JP
Priority Data:
2017-07641107.04.2017JP
Title (EN) STEEL MEMBER, HOT-ROLLED STEEL SHEET FOR SAID STEEL MEMBER AND PRODUCTION METHODS THEREFOR
(FR) ÉLÉMENT EN ACIER, TÔLE D'ACIER LAMINÉE À CHAUD DESTINÉE À CET ÉLÉMENT EN ACIER, ET PROCÉDÉS DE PRODUCTION ASSOCIÉS
(JA) 鋼部材、前記鋼部材用の熱延鋼板およびこれらの製造方法
Abstract:
(EN) The purpose of the present invention is to provide a steel member with excellent fatigue resistance characteristics in the plastic strain range, a hot-rolled steel sheet as the material therefor and production methods therefor. A steel member, which contains 0.031-0.200 mass% Ti and in the structure of which at least 0.005 mass% of the Ti is precipitated as precipitates with a particle size of 20 nm or less. A hot-rolled steel sheet for said steel member that contains 0.031-0.200 mass% Ti and in the structure of which at least 0.005 mass% of the Ti is present as Ti solid solution. A production method for said steel member in which, after molding of the hot-rolled steel sheet, heat treatment is performed wherein the member is heated to a temperature greater than 550°C and not exceeding 1050°C and then cooled at an average cooling rate of at least 10°C/s for the temperature range of 550-400°C. A production method for said hot-rolled steel sheet in which a steel slab containing 0.031-0200 mass% Ti is extracted under temperature conditions higher than the equilibrium solid solution temperature TTi determined from a specified formula, after which finish-rolling is completed at a temperature of at least TTi-400°C, the sheet is cooled at an average cooling rate of at least 10°C/s for the temperature range from TTi-400°C to TTi-500°C, and is coiled at a temperature of TTi-500°C or less.
(FR) L'objectif de la présente invention est de fournir un élément en acier présentant d'excellentes caractéristiques de résistance à la fatigue dans la plage de déformation plastique, une tôle d'acier laminée à chaud en tant que matériau destiné à cet élément, ainsi que des procédés de production associés. Un élément en acier, qui contient de 0,031 à 0,200 % en masse de Ti et dans la structure duquel au moins 0,005 % en masse de ce Ti est précipité sous la forme de précipités ayant une dimension de particule de 20 nm ou moins. Une tôle d'acier laminée à chaud, destinée à cet élément en acier qui contient 0,031 à 0,200 % en masse de Ti et dans la structure de laquelle au moins 0,005 % en masse de ce Ti est présent sous la forme d'une solution solide de Ti. L'invention concerne un procédé de production de l'élément en acier consistant, après moulage de la tôle d'acier laminée à chaud, à effectuer un traitement thermique dans lequel l'élément est chauffé à une température supérieure à 550 °C et ne dépassant pas 1050 °C, puis refroidi à une vitesse de refroidissement moyenne d'au moins 10 °C/s pour la plage de température de 550 à 400 °C. L'invention concerne également un procédé de production de la tôle d'acier laminée à chaud dans lequel une brame d'acier contenant de 0,031 à 0,200 % en masse de Ti est extraite dans des conditions d'une température supérieure à la température de solution solide d'équilibre T Ti T déterminée à partir d'une formule spécifiée, après quoi le laminage de finition est effectué à une température d'au moins T Ti -400 °C , et la tôle est refroidie à une vitesse de refroidissement moyenne d'au moins 10 °C/s pour la plage de température allant de T Ti -400 °C à T Ti -500 °C , et est enroulée à une température de T Ti -500 °C ou moins.
(JA) 塑性歪域での耐疲労特性に優れた鋼部材と、その素材となる熱延鋼板およびこれらの製造方法を提供すること。 質量%で、Tiを0.031~0.200%含有し、組織中に0.005%以上のTiが粒径20nm以下の析出物として析出している、鋼部材。質量%で、Tiを0.031~0.200%含有し、組織中に0.005%以上のTiが固溶Tiとして存在する前記鋼部材用の熱延鋼板。前記熱延鋼板に成形加工を施した後に、550℃を超え1050℃以下の温度に加熱した後、550~400℃の温度域を10℃/s以上の平均冷却速度で冷却する熱処理を施す前記鋼部材の製造方法。質量%で、Tiを0.031~0.200%含有する鋼スラブを、所定の式から求めた平衡固溶温度TTiよりも高い温度条件でスラブ抽出した後、TTi-400℃以上の温度で仕上げ圧延を終了し、TTi-400℃からTTi-500℃までの温度域を10℃/s以上の平均冷却速度で冷却し、TTi-500℃以下の温度で巻き取る前記熱延鋼板の製造方法。
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African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)