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1. WO1996002678 - PROCESS FOR PRODUCING STEEL MATERIAL AND STEEL PIPE EXCELLENT IN CORROSION RESISTANCE AND WELDABILITY

Publication Number WO/1996/002678
Publication Date 01.02.1996
International Application No. PCT/JP1995/001428
International Filing Date 18.07.1995
Chapter 2 Demand Filed 18.08.1995
IPC
C21D 8/00 2006.01
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
C21D 8/10 2006.01
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
C22C 38/20 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
20with copper
CPC
C21D 8/005
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
005of ferrous alloys
C21D 8/105
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
105of ferrous alloys
C22C 38/20
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
20with copper
Applicants
  • NIPPON STEEL CORPORATION [JP/JP]; 6-3, Otemachi 2-chome Chiyoda-ku Tokyo 100-71, JP (AllExceptUS)
  • MIYASAKA, Akihiro [JP/JP]; JP (UsOnly)
  • OBATA, Masaaki [JP/JP]; JP (UsOnly)
  • MOTOYOSHI, Takashi [JP/JP]; JP (UsOnly)
Inventors
  • MIYASAKA, Akihiro; JP
  • OBATA, Masaaki; JP
  • MOTOYOSHI, Takashi; JP
Agents
  • ISHIDA, Takashi ; A. Aoki & Associates Toranomon 37 Mori Building 5-1, Toranomon 3-chome Minato-ku Tokyo 105, JP
Priority Data
6/18680318.07.1994JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) PROCESS FOR PRODUCING STEEL MATERIAL AND STEEL PIPE EXCELLENT IN CORROSION RESISTANCE AND WELDABILITY
(FR) PROCEDE POUR PRODUIRE UN ACIER ET DES TUBES EN ACIER PRESENTANT UNE EXCELLENTE RESISTANCE A LA CORROSION ET UNE EXCELLENTE SOUDABILITE
Abstract
(EN)
A process for producing steel material and steel pipe excellent in corrosion resistance in an environment containing wet carbon dioxide and trace hydrogen sulfide and also excellent in weldability at a low cost and a high productivity. The process comprises heating to 1,100 - 1,300 °C a billet containing, on the weight basis, 0.01 - 0.6 % of Si, 0.02 - 1.8 % of Mn, 7.5 - 14.0 % of Cr, 1.5 - 4.0 % of Cu, 0.005 - 0.1 % of Al, at most 0.02 % of C, at most 0.02 % of N, at most 0.025 % of P, at least 0.01 % of S, and the balance consisting of Fe and inevitable impurities, and hot rolling the heated billet under such conditions that the cumulative draft is at least 65 % at temperatures below 1,050 °C and the rolling termination temperature is 800 °C or above, followed by cooling at a cooling rate of less than 0.02 °C/min at least to a temperature of 500 °C to render the metal structure substantially ferritic.
(FR)
L'invention concerne un procédé pour produire un acier et des tubes en acier présentant une excellente résistance à la corrosion dans un environnement humide contenant du gaz carbonique et des traces d'acide sulfhydrique, ainsi qu'une excellente soudabilité. Le procédé est peu coûteux et permet un rendement élevé. Il consiste à chauffer à 1100 - 1300 °C un lingot présentant une teneur pondérale de 0,01 - 0,6 % de Si, 0,02 - 1,8 % de Mn, 7,5 - 14,0 % de Cr, 1,5 - 4,0 % de Cu, 0,005 - 0,1 % d'Al, au plus 0,02 % de C, au plus 0,02 % de N, au plus 0,025 % de P, au moins 0,01 % de S, le reste étant composé de Fe et des inévitables impuretés, à laminer à chaud le lingot chauffé dans les conditions indiquées pour que l'étirage cumulé soit d'au moins 65 % à des températures inférieures à 1050° et pour que le laminage se termine à une température d'au moins 800 °C, puis à refroidir à une vitesse de refroidissement inférieure à 0,02 °C/min jusqu'à une température de 500 °C ou moins, afin de conférer au métal une structure essentiellement ferritique.
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