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1. WO2014156175 - STEEL PLATE FOR THICK STEEL PIPE, METHOD FOR MANUFACTURING SAME, AND HIGH STRENGTH THICK STEEL PIPE

Publication Number WO/2014/156175
Publication Date 02.10.2014
International Application No. PCT/JP2014/001801
International Filing Date 27.03.2014
IPC
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
B21C 37/08 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
CMANUFACTURE 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
37Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
06of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
08Making tubes with welded or soldered seams
C21D 8/00 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
C22C 38/12 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
12containing tungsten, tantalum, molybdenum, vanadium or niobium
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
B21C 37/08
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
37Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
06of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
08Making tubes with welded or soldered seams
C21D 2211/002
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
2211Microstructure comprising significant phases
002Bainite
C21D 6/001
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
6Heat treatment of ferrous alloys
001containing Ni
C21D 6/004
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
6Heat treatment of ferrous alloys
004containing Cr and Ni
C21D 6/005
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
6Heat treatment of ferrous alloys
005containing Mn
C21D 6/008
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
6Heat treatment of ferrous alloys
008containing Si
Applicants
  • JFEスチール株式会社 JFE STEEL CORPORATION [JP]/[JP]
Inventors
  • 太田 周作 OHTA, Shusaku
  • 嶋村 純二 SHIMAMURA, Junji
  • 石川 信行 ISHIKAWA, Nobuyuki
  • 遠藤 茂 ENDO, Shigeru
  • 津山 青史 TSUYAMA, Seishi
Agents
  • 熊坂 晃 KUMASAKA, Akira
Priority Data
2013-07095529.03.2013JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) STEEL PLATE FOR THICK STEEL PIPE, METHOD FOR MANUFACTURING SAME, AND HIGH STRENGTH THICK STEEL PIPE
(FR) PLAQUE D'ACIER POUR UN TUYAU D'ACIER ÉPAIS, SON PROCÉDÉ DE FABRICATION ET TUYAU D'ACIER ÉPAIS À RÉSISTANCE ÉLEVÉE
(JA) 厚肉鋼管用鋼板、その製造方法、および厚肉高強度鋼管
Abstract
(EN)
Provided are a steel plate for thick steel pipe having superior CTOD characteristics in parts thermally affected by circumferential welds, a manufacturing method for the same, and a thick steel pipe. A steel plate is formed from 0.03 - 0.10% C, 0.05 - 0.50% Si, 1.00 - 2.00% Mn, 0.015% or less P, 0.005% or less S, 0.20% or less (including 0%) Mo, 0.01 - 0.05% Nb, and if necessary, one or two or more of 0.005 - 0.1% Al, 1.00% or less Cu, 1.00% or less Ni, 0.50% or less Cr, and 0.05% or less V, Pcm* (%) (= C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/2 + V/10) ≤ 0.20, with the remainder being Fe and inevitable impurities. The bainite fraction of the parent material is 50% or greater and the island shaped martensite (MA) fraction in a two-phase reheated granular region is 5.0% or less. After a continuous cast slab of the component system above is reheated to a specific temperature, the same is hot rolled and thereafter undergoes accelerated cooling to 550 - 250°.
(FR)
L'invention concerne une plaque d'acier pour un tuyau d'acier épais ayant des caractéristiques CTOD supérieures dans des parties affectées de façon thermique par des soudures circonférentielles, son procédé de fabrication et un tuyau d'acier épais. Une plaque d'acier est formée à partir de 0,03 - 0,10 % de C, 0,05 - 0,50 % de Si, 1,00 - 2,00 % de Mn, 0,015 % ou moins de P, 0,005 % ou moins de S, 0,20 % ou moins (comprenant 0 %) de Mo, 0,01 - 0,05 % de Nb, et si nécessaire, un ou deux ou plus parmi 0,005 - 0,1 % d'Al, 1,00 % ou moins de Cu, 1,00 % ou moins de Ni, 0,50 % ou moins de Cr et 0,05 % ou moins de V, Pcm* (%) (= C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/2 + V/10) ≤ 0,20, avec le reste étant Fe et des impuretés inévitables. La fraction de bainite de la matière parent est 50 % ou plus et la fraction de martensite en forme d'îlot (MA) dans une région granulaire réchauffée diphasique est 5,0 % ou moins. Après une coulée continue, une brame du système de composant ci-dessus est réchauffée jusqu'à une température spécifique, celle-ci est laminée à chaud et subit ensuite un refroidissement accéléré jusqu'à 550 - 250°.
(JA)
 円周溶接熱影響部のCTOD特性に優れる厚肉鋼管用鋼板およびその製造方法、ならびに厚肉鋼管を提供する。 C:0.03~0.10%、Si:0.05~0.50%、Mn:1.00~2.00%、P:0.015%以下、S:0.005%以下、Mo:0.20%以下(0%を含む)、Nb:0.01~0.05%、必要に応じて、Al:0.005~0.1%、Cu:1.00%以下、Ni:1.00%以下、Cr:0.50%以下、V:0.05%以下のうち1種または2種以上、Pcm*(%)(=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/2+V/10)≦0.20、残部Feおよび不可避的不純物からなり、母材のベイナイト分率が50%以上かつ二相域再加熱粗粒域における島状マルテンサイト(MA)分率が5.0%以下である鋼板。上記成分系の連続鋳造スラブを、特定温度に再加熱後、熱間圧延し、その後、550~250℃まで加速冷却を施す。
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