Steel and oil well pipes
A technology for steel and steel pipes, applied in the direction of pipes, rigid pipes, transportation and packaging, etc., can solve the problems of low fracture toughness value, no evaluation of SSC resistance, etc., and achieve the effect of excellent SSC resistance
Active Publication Date: 2020-08-18
NIPPON STEEL CORP
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[0014] In Patent Document 1 and Patent Document 2, there is no evaluation in H 2 High pressure H with S partial pressure of 5 to 15 atm 2 SSC resistance in S environment, there may be high pressure H 2 Fracture toughness value K in S environment ISSC low case
Method used
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[0147] [Manufacturing method of test material]
[0148] 180 kg of molten steel having the chemical composition shown in Table 1 was produced.
[0149] [Table 1]
[0150]
[0151] A steel ingot was produced from the above molten steel. Steel ingots are hot-rolled to produce steel plates. Table 2 shows the plate thickness (mm) of the steel plate.
[0152] [Table 2]
[0153] Table 2
[0154]
[0155] Each hot-rolled steel sheet was quenched at the quenching temperature shown in Table 2. After quenching, each steel plate was tempered at the tempering temperature shown in Table 2. During the tempering process, adjust the tempering temperature so that the yield strength of the steel plates of steel 1, 2, 10, 11 and 22 reaches the T95 level equivalent to the API standard (yield strength is 655-760MPa), and the steel plates of other steels The yield strength reaches API standard C110 level (yield strength is 760-862MPa). The holding time at the tempering temperature for ...
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Abstract
Provide a high pressure H 2 There is also an excellent SSC steel in the S environment.The steel of the present invention has the following chemical composition: in quality %, contains C: 0.15 to 0.45 %, Si: 0.10 ~ 1.0 %, Mn: 0.10 %, less than 0.90 %, P: 0.05 %, S: 0.01 % below, AL: 0.01 ~ 0.1 %, N: 0.010 %, CR: 0.1 ~ 2.5 %, MO: 0.35 ~ 3.0 % and CO: 0.50 ~ 3.0 %, meet the type (1) and (2), contains the volume ratio to contain the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the volume ratio containing the amountMore than 90 % of the recovery of Majones.C+Mn / 6+(CR+MO+V) / 5+(CU+NI) / 15 -CO / 6+≥ 0.50 (1) (3C+MO+3CO) / (3mn+CR) ≥ 1.0 (2) Effective B = B -11 (n -Ti / 3.4) / 14 (3) where, the α of the formula (1) is valid in the formula (3) valid B (mass %) to 0.0003 % or more0.250, 0 when valid B is less than 0.0003 %.
Description
technical field [0001] The present invention relates to steel materials and steel pipes for oil wells, and more specifically relates to steel materials and steel pipes for oil wells suitable for acidic environments. Background technique [0002] Due to the deepening of oil wells and natural gas wells (hereinafter, oil wells and natural gas wells are collectively referred to as "oil wells"), higher strength of steel pipes for oil wells is required. Specifically, oil well steel pipes of 80ksi grade (yield stress of 80 to 95ksi, ie 551 to 654MPa) and 95ksi grade (yield stress of 95 to 110ksi, ie 654 to 758MPa) are widely used. [0003] Deep wells are mostly acid environments containing corrosive hydrogen sulfide. Steel pipes for oil wells used in such acidic environments are required to have not only high strength but also resistance to sulfide stress cracking (Sulfide Stress Cracking resistance: hereinafter referred to as SSC resistance). [0004] For steels with high streng...
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IPC IPC(8): C22C38/00C22C38/54C21D8/10
CPCC21D8/10C22C38/00C22C38/54C21D6/004C21D6/005C21D6/007C21D6/008C21D8/105C21D9/085C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/30C21D2211/008C21D2211/002C21D2211/001C21D9/08C22C38/10C22C38/20C22C38/24C22C38/32C22C38/28C22C38/08C22C38/22C22C38/18C22C38/105C22C38/12C22C38/40C22C38/14C22C38/16B32B15/013B32B1/08Y10T428/12972Y10T428/12917Y10T428/12979Y10T428/12799Y10T428/12951Y10T428/12958F16L9/00Y10T428/12965B32B15/011Y10T428/13F16L9/02
Inventor 荒井勇次
Owner NIPPON STEEL CORP