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1. WO2022044271 - ELECTRIC RESISTANCE WELDED STEEL PIPE

Publication Number WO/2022/044271
Publication Date 03.03.2022
International Application No. PCT/JP2020/032636
International Filing Date 28.08.2020
IPC
C21D 8/10 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
10during manufacturing of tubular bodies
C21D 9/08 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
08for tubular bodies or pipes
C21D 9/50 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
50for welded joints
C22C 38/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/58 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
58with more than 1.5% by weight of manganese
CPC
C21D 8/10
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
10during manufacturing of tubular bodies
C21D 9/08
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
08for tubular bodies or pipes
C21D 9/50
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
50for welded joints
C22C 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/58
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
58with more than 1.5% by weight of manganese
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
Inventors
  • 長井 健介 NAGAI Kensuke
  • 横井 龍雄 YOKOI Tatsuo
  • 河野 英人 KAWANO Hideto
  • 小林 俊一 KOBAYASHI Shunichi
  • 岩本 修治 IWAMOTO Shuji
Agents
  • 棚井 澄雄 TANAI Sumio
  • 寺本 光生 TERAMOTO Mitsuo
  • 勝俣 智夫 KATSUMATA Tomoo
  • 山口 洋 YAMAGUCHI Yoh
Priority Data
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) ELECTRIC RESISTANCE WELDED STEEL PIPE
(FR) TUYAU EN ACIER SOUDÉ PAR RÉSISTANCE ÉLECTRIQUE
(JA) 電縫鋼管
Abstract
(EN) This electric resistance welded steel pipe comprises a base material part having a predetermined chemical composition and a welded part. If tB is the wall thickness of the base material part and tS is the wall thickness of the welded part, the microstructure of the base material part at a position where the depth from the outer surface is (1/4)tB is composed of, in area%, from 10% to 50% of bainite, from 50% to 90% of polygonal ferrite, and 1% or less of residual structures, while having an average crystal grain size of 20 μm or less; the microstructure of the welded part at a position where the depth from the outer surface is (1/4)tS is composed of, in area%, from 70% to 90% of bainite, polygonal ferrite, and 1% or less of residual structures, while having an average crystal grain size of 15 μm or less. The degree of integration of (001) at the butted surface of the welded part is 1.5 or less; the hardness of the welded part is 250 Hv or less; and at -20°C, the base material part and the welded part have a Charpy impact absorbed energy of 150 J or more, a yield stress of from 360 MPa to 600 MPa, and a tensile strength of from 465 MPa to 760 MPa.
(FR) L'invention concerne un tuyau en acier soudé par résistance électrique, comprenant une partie de matériau de base ayant une composition chimique prédéterminée et une partie soudée Si tB est l'épaisseur de paroi de la partie de matériau de base et tS est l'épaisseur de paroi de la partie soudée, la microstructure de la partie de matériau de base à une position où la profondeur à partir de la surface externe est de (1/4)tB est composée, en % surfacique, de 10 % à 50 % de bainite, de 50 % à 90 % de ferrite polygonale et 1% ou moins de structures résiduelles, tout en ayant une taille moyenne des grains cristallins inférieure ou égale à 20 µm ; la microstructure de la partie soudée à une position où la profondeur à partir de la surface externe est de (1/4)tS est composée , en % surfacique, de 70 % à 90 % de bainite, de ferrite polygonale et 1 % ou moins de structures résiduelles, tout en ayant une taille moyenne des grains cristallins inférieure ou égale à 15 µm. Le degré d'intégration de (001) au niveau de la surface aboutée de la partie soudée est inférieur ou égal à 1,5 ; la dureté de la partie soudée est inférieure ou égale à 250 Hv ; et à -20 °C, la partie de matériau de base et la partie soudée ont une énergie absorbée par choc Charpy supérieure ou égale à 150 J, une contrainte à la rupture de 360 MPa à 600 MPa et une résistance à la traction de 465 MPa à 760 MPa.
(JA) この電縫鋼管は、所定の化学組成を有する母材部と溶接部とを有し、前記母材部の肉厚をtB、前記溶接部の肉厚をtSとしたときに、前記母材部の外表面から(1/4)tBの位置におけるミクロ組織が、面積%で、10~50%のベイナイトと、50~90%のポリゴナルフェライトと、1%以下の残部組織とからなり、平均結晶粒径が20μm以下であり、前記溶接部の外表面から(1/4)tSの位置におけるミクロ組織が、面積%で、70%~90%のベイナイトと、ポリゴナルフェライトと、1%以下の残部組織とからなり、平均結晶粒径が15μm以下であり、前記溶接部の突き合わせ面における{001}の集積度が1.5以下であり、前記溶接部の硬度が250Hv以下であり、-20℃における前記母材部及び前記溶接部のシャルピー衝撃吸収エネルギーが150J以上であり、降伏応力が360~600MPaであり、引張強さが465~760MPaである。
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