US2019292637A1PendingUtilityA1

Oil well pipe for expandable tubular

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Assignee: NIPPON STEEL & SUMITOMO METAL CORPPriority: Aug 30, 2016Filed: Aug 30, 2016Published: Sep 26, 2019
Est. expiryAug 30, 2036(~10.1 yrs left)· nominal 20-yr term from priority
Inventors:Kensuke NagaiManabu WadaNoboru HasegawaHirohito ImamuraMasakazu Ozaki
C21D 8/10C22C 38/44C22C 38/28C22C 38/04C21D 1/18C22C 38/22C21D 9/085C22C 38/002C22C 38/26C22C 38/46C22C 38/48C22C 38/12C22C 38/02C22C 38/20C22C 38/24C22C 38/08C21D 9/08C22C 38/50C22C 38/16C22C 38/06C22C 38/14C21D 2211/009C21D 2211/002C21D 2211/005C21D 2211/008C22C 38/00C21D 8/105C22C 38/58
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Claims

Abstract

An oil well pipe for expandable tubular, containing, in terms of % by mass: 0.020 to 0.080% of C, 0.50% or less of Si, 0.30 to 1.60% of Mn, 0.030% or less of P, 0.010% or less of S, 0.005 to 0.050% of Ti, and 0.010 to 0.500% of Al, and the balance being Fe and impurities, wherein, in a metallographic microstructure, an area fraction of a first phase composed of ferrite is from 90.0% to 98.0% and an area fraction of a second phase composed of one or more selected from the group consisting of tempered martensite, tempered bainite, and pearlite is from 2.0% to 10.0%.

Claims

exact text as granted — not AI-modified
1 . An oil well pipe for expandable tubular, consisting of, in terms of % by mass:
 0.020 to 0.080% of C,   0.03 to 0.50% of Si,   0.30 to 1.60% of Mn,   0 to 0.030% of P,   0 to 0.010% of S,   0.005 to 0.050% of Ti,   0.010 to 0.500% of Al,   0 to 0.100% of Nb,   0 to 1.00% of Ni,   0 to 1.00% of Cu,   0 to 0.50% of Mo,   0 to 1.00% of Cr,   0 to 0.100% of V,   0 to 0.0060% of Ca, and   the balance being Fe and impurities,   wherein, in a metallographic microstructure, an area fraction of a first phase composed of ferrite is from 90.0% to 98.0% and an area fraction of a second phase composed of one or more selected from the group consisting of tempered martensite, tempered bainite and pearlite is from 2.0% to 10.0%.   
     
     
         2 . The oil well pipe for expandable tubular according to  claim 1 , consisting of, in terms of % by mass,
 0.020 to 0.080% of C,   0.03 to 0.50% of Si,   0.30 to 1.60% of Mn,   0 to 0.030% of P,   0 to 0.010% of S,   0.005 to 0.050% of Ti,   0.010 to 0.500% of Al, and   the balance being Fe and impurities.   
     
     
         3 . The oil well pipe for expandable tubular according to  claim 1 , wherein a content of Al is, in term of % by mass, 0.060 to 0.500%. 
     
     
         4 . The oil well pipe for expandable tubular according to  claim 1 , which is an electric resistance welded steel pipe and satisfies the following Formula (1):
   Mn/Si>2.0  Formula(1)
   wherein, in Formula (1), Mn and Si each represent % by mass of each element.   
     
     
         5 . The oil well pipe for expandable tubular according to  claim 2 , wherein a content of Al is, in term of % by mass, 0.060 to 0.500%. 
     
     
         6 . The oil well pipe for expandable tubular according to  claim 2 , which is an electric resistance welded steel pipe and satisfies the following Formula (1):
   Mn/Si>2.0  Formula (1)
   wherein, in Formula (1), Mn and Si each represent % by mass of each element.   
     
     
         7 . The oil well pipe for expandable tubular according to  claim 3 , which is an electric resistance welded steel pipe and satisfies the following Formula (1):
   Mn/Si>2.0  Formula (1)
   wherein in Formula (1), Mn and Si each represent % by mass of each element.   
     
     
         8 . An oil well pipe for expandable tubular, comprising, in terms of % by mass:
 0.020 to 0.080% of C,   0.03 to 0.50% of Si,   0.30 to 1.60% of Mn,   0 to 0.030% of P,   0 to 0.010% of S,   0.005 to 0.050% of Ti,   0.010 to 0.500% of Al,   0 to 0.100% of Nb,   0 to 1.00% of Ni,   0 to 1.00% of Cu,   0 to 0.50% of Mo,   0 to 1.00% of Cr,   0 to 0.100% of V,   0 to 0.0060% of Ca, and   the balance comprising Fe and impurities,   wherein, in a metallographic microstructure, an area fraction of a first phase composed of ferrite is from 90.0% to 98.0% and an area fraction of a second phase composed of one or more selected from the group consisting of tempered martensite, tempered bainite and pearlite is from 2.0% to 10.0%.   
     
     
         9 . The oil well pipe for expandable tubular according to  claim 8 , wherein a content of Al is, in term of % by mass, 0.060 to 0.500%. 
     
     
         10 . The oil well pipe for expandable tubular according to  claim 8 , which is an electric resistance welded steel pipe and satisfies the following Formula (1):
   Mn/Si>2.0  Formula (1)
   wherein, in Formula (1), Mn and Si each represent % by mass of each element.   
     
     
         11 . The oil well pipe for expandable tubular according to  claim 9 , which is an electric resistance welded steel pipe and satisfies the following Formula (1):
   Mn/Si>2.0  Formula (1)
   wherein, in Formula (1), Mn and Si each represent % by mass of each element.

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