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1. WO2020003720 - ELECTRIC-RESISTANCE-WELDED STEEL PIPE FOR PRODUCING HOLLOW STABILIZER, HOLLOW STABILIZER, AND METHOD FOR PRODUCING SAME

Publication Number WO/2020/003720
Publication Date 02.01.2020
International Application No. PCT/JP2019/017399
International Filing Date 24.04.2019
IPC
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
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
B PERFORMING OPERATIONS; TRANSPORTING
21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
D
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING
7
Bending rods, profiles, or tubes
02
over a stationary forming member; by use of a swinging forming member or abutment
024
by a swinging forming member
025
and pulling or pushing the ends of the work
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
G
VEHICLE SUSPENSION ARRANGEMENTS
21
Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
02
permanently interconnected
04
mechanically
05
between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
055
Stabiliser bars
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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
10
during manufacturing of tubular bodies
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
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
18
containing chromium
38
with more than 1.5% by weight of manganese
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
18
containing chromium
40
with nickel
58
with more than 1.5% by weight of manganese
C22C 38/00 (2006.01)
B21C 37/08 (2006.01)
B21D 7/025 (2006.01)
B60G 21/055 (2006.01)
C21D 8/10 (2006.01)
C21D 9/08 (2006.01)
CPC
B21C 37/08
B21D 7/025
B60G 21/055
C21D 8/10
C21D 9/08
C21D 9/50
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
  • 荒谷 昌利 ARATANI Masatoshi; JP
  • 松井 亮二 MATSUI Ryoji; JP
  • 近藤 友則 KONDO Tomonori; JP
  • 小久保 信作 KOKUBO Shinsaku; JP
Agents
  • 田中 秀▲てつ▼ TANAKA Hidetetsu; JP
  • 廣瀬 一 HIROSE Hajime; JP
  • 宮坂 徹 MIYASAKA Toru; JP
  • 森 哲也 MORI Tetsuya; JP
Priority Data
2018-12179927.06.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) ELECTRIC-RESISTANCE-WELDED STEEL PIPE FOR PRODUCING HOLLOW STABILIZER, HOLLOW STABILIZER, AND METHOD FOR PRODUCING SAME
(FR) TUYAU EN ACIER SOUDÉ PAR RÉSISTANCE ÉLECTRIQUE POUR PRODUIRE UN STABILISATEUR CREUX, STABILISATEUR CREUX ET SON PROCÉDÉ DE PRODUCTION
(JA) 中空スタビライザー製造用の電縫鋼管、中空スタビライザー、及びそれらの製造方法
Abstract
(EN)
The present invention makes it possible to provide a high-strength stabilizer having excellent bending workability and fatigue characteristics even when a hollow steel pipe is used as the stabilizer to reduce weight. An electric-resistance-welded steel pipe (5) for producing a hollow stabilizer has a Lankford value (r value) in the pipe longitudinal direction of 0.7 to less than 1.0. The electric-resistance-welded steel pipe (5) is cold-bend formed, then subjected to heat treatment comprising quenching and tempering, and a stabilizer is produced. The cold-bend forming is a cold rotational draw-bending process, in which the bend radius is 1.0 to 3.0 times the outside diameter of the electric-resistance-welded steel pipe (5) prior to cold-bend forming by the process, the flattening ratio when processed is 0% to 10%, the thickness reduction ratio of the outside of the bend and the thickness increase ratio of the inside of the bend are 0% to 10%, and the change in circumference of the center part of the bend is 0% to 10%. The Vickers hardness of the heat-treated stabilizer is adjusted to 400 HV to less than 580 HV.
(FR)
La présente invention permet de fournir un stabilisateur à haute résistance présentant d'excellentes caractéristiques de maniabilité à la flexion et de fatigue même lorsqu'un tuyau en acier creux est utilisé en tant que stabilisateur pour réduire le poids. Un tuyau en acier soudé par résistance électrique (5) destiné à produire un stabilisateur creux a une valeur de Lankford (valeur r) dans la direction longitudinale du tuyau de 0,7 à moins de 1,0. Le tuyau en acier soudé par résistance électrique (5) est formé par cintrage à froid, puis soumis à un traitement thermique comprenant une trempe et un revenu, et un stabilisateur est produit. Le formage par cintrage à froid est un procédé de cintrage par étirage en rotation à froid, dans lequel le rayon de courbure est 1,0 à 3,0 fois le diamètre extérieur du tuyau en acier soudé par résistance électrique (5) avant le formage par cintrage à froid par le procédé, le rapport d'aplatissement lorsqu'il est traité est compris entre 0 % et 10 %, le rapport de réduction d'épaisseur de l'extérieur du coude et le rapport d'augmentation d'épaisseur de l'intérieur du coude étant compris entre 0 % et 10 %, et le changement de circonférence de la partie centrale du coude étant compris entre 0 % et 10 %. La dureté Vickers du stabilisateur traité à chaud est réglée à 400 HV, mais est inférieure à 580 HV.
(JA)
スタビライザーとして軽量化のために中空鋼管を使用しても、曲げ加工性及び疲労特性に優れた高強度のスタビライザーを提供可能とする。中空スタビライザーを製造するための電縫鋼管(5)は、管長手方向のランクフォード値(r値)が0.7以上1.0未満である。この電縫鋼管(5)に対し、冷間曲げ成形を施した後に、焼入れ処理及び焼戻処理からなる熱処理を行い、スタビライザーを製造する。冷間曲げ成形は、冷間での回転引き曲げ加工であり、その加工による冷間曲げ成形前の電縫鋼管(5)の外径の1.0倍以上3.0倍の曲げ半径で、加工した際の扁平率が0%以上10%以下で、かつ曲げ外側の減肉率及び曲げ内側の増肉率が0%以上10%以下で、更に曲げ中心部の周長変化が0%以上10%以下である。上記熱処理後のスタビライザーのビッカース硬さを400HV以上580HV未満に調整する。
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