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    • 31. 发明专利
    • High strength stainless steel pipe excellent in corrosion resistance for use in oil well and method for production thereof
    • 高强度不锈钢管,耐腐蚀性优良,用于油井及其生产方法
    • JP2005336595A
    • 2005-12-08
    • JP2004210904
    • 2004-07-20
    • Jfe Steel KkJfeスチール株式会社
    • KIMURA MITSUOTAMATOSHI TAKANORIMOCHIZUKI RYOSUKEYAMAZAKI YOSHIO
    • C21D8/10C21D1/25C21D6/00C21D9/08C22C38/00C22C38/58
    • C22C38/42C21D1/25C21D6/004C21D9/08C22C38/02C22C38/04C22C38/44Y10S148/909
    • PROBLEM TO BE SOLVED: To provide a high strength stainless steel pipe excellent in corrosion resistance for use in an oil well which has a high strength exceeding 654 MPa of YS, and also exhibits excellent resistance to the corrosion by CO
      2 , even when it is exposed to an severe corrosive circumstance containing CO
      2 , Cl
      - and the like and having a high temperature up to 230°C.
      SOLUTION: The steel pipe has a chemical composition, in mass%, that C: 0.005 to 0.05%, Si: 0.05 to 0.5%, Mn: 0.2 to 1.8%, P: 0.03% or less, S: 0.05 to 0.5%, Mn: 0.2 to 1.8%, P: 0.03% or less, S: 0.005% or less, Cr: 15.5 to 18%, Ni: 1.5 to 5%, Mo: 1 to 3.5%, V: 0.02 to 0.2%, N: 0.01 to 0.15%, O: 0.006% or less, with the proviso that Cr+0.65Ni+0.6Mo+0.55Cu-20C≥19.5 and Cr+Mo+0.3Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5 are satisfied, [wherein Cr, Ni, Mo, Cu, C, Si, Mn and N represent the contents (mass%) of respective elements], and the balance: Fe and inevitable impurities. The steel pipe is preferably subjected to quenching-tempering treatment, and preferably has a structure comprising a martensitic phase as a base phase and a ferritic phase of 10 to 60 vol%, or further comprising an austenitic phase of ≤30 vol.% as well. The steel pipe may comprise one or more selected from Al, Cu, Nb, Ti, Zr, W, B and Ca as well.
      COPYRIGHT: (C)2006,JPO&NCIPI
    • 要解决的问题:为了提供优异的耐腐蚀性的高强度不锈钢管,其用于具有超过654MPa的YS的高强度的油井,并且还表现出优异的耐CO 2 ,即使暴露于含有CO 2 ,Cl - 等的严重腐蚀性环境中,并且具有高达230℃的高温。 钢管的化学组成为质量%:C:0.005〜0.05%,Si:0.05〜0.5%,Mn:0.2〜1.8%,P:0.03%以下,S:0.05〜 0.5%,Mn:0.2〜1.8%,P:0.03%以下,S:0.005%以下,Cr:15.5〜18%,Ni:1.5〜5%,Mo:1〜3.5%,V:0.02〜0.2 %,N:0.01〜0.15%,O:0.006%以下,条件是Cr + 0.65Ni + 0.6Mo + 0.55Cu-20C≥19.5,Cr + Mo + 0.3Si-43.5C-0.4Mn-Ni- 0.3Cu-9N≥11.5,[其中Cr,Ni,Mo,Cu,C,Si,Mn和N表示各元素的含量(质量%)],余量为Fe和不可避免的杂质。 钢管优选进行淬火回火处理,优选具有包含马氏体相为基体相和10〜60体积%的铁素体相,或进一步含有≤30体积%的奥氏体相的结构 。 钢管也可以包含选自Al,Cu,Nb,Ti,Zr,W,B和Ca中的一种或多种。 版权所有(C)2006,JPO&NCIPI