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03125 HIGH-STRENGTH CORROSION RESISTANT NICKEL-BASE ALLOY 725HS FOR SEVERE SOUR OIL AND GAS FIELD APPLICATIONS

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Product Number: 51300-03125-SG
ISBN: 03125 2003 CP
Author: Edward L Hibner, Brett Puckett
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Today’s global exploration of oil and gas leads to a range of highly corrosive environments that, in turn, require corrosion resistant high nickel content alloys for subsurface and wellhead equipment. Materials have to meet criteria for corrosion resistance and mechanical properties in severe environments for the required service life. This paper presents the latest development of a higher strength grade of alloy 725 (UNS N07725), alloy 725HS. This new age-hardenable nickel base alloy 725HS offers many advantages such as higher-strength, toughness and excellent corrosion resistance. The standard alloy 725 grade is typically specified with 120 ksi (827 MPa ) minimum yield strength compared to alloy 725HS with 140 ksi (965 MPa ) minimum yield strength. The grades are approved to NACE MR0175 up to hardness levels of 40 HRC and 43 HRC maximum for the alloys 725 and alloy 725HS, respectively. The higher strength level of alloy 725HS offers higher strength for sour well service compared with the traditionally used alloy 718 (UNS N07718). Corrosion data is also presented showing the performance of the age-hardenable nickel alloys in seawater, resisting chloride stress corrosion cracking, and in sour well environments using the slow strain rate and C-ring test methods. Alloys 725 and 725HS are also shown to be suitable candidate materials in severely corrosive high temperature oil patch environments. Sour environments in which alloys 725 and 725HS have met the criteria for corrosion resistance are defined with and without free sulfur. Keywords: nickel-base alloys, sour environments, corrosion resistance, age-hardened, high-strength, bar, oil field
Today’s global exploration of oil and gas leads to a range of highly corrosive environments that, in turn, require corrosion resistant high nickel content alloys for subsurface and wellhead equipment. Materials have to meet criteria for corrosion resistance and mechanical properties in severe environments for the required service life. This paper presents the latest development of a higher strength grade of alloy 725 (UNS N07725), alloy 725HS. This new age-hardenable nickel base alloy 725HS offers many advantages such as higher-strength, toughness and excellent corrosion resistance. The standard alloy 725 grade is typically specified with 120 ksi (827 MPa ) minimum yield strength compared to alloy 725HS with 140 ksi (965 MPa ) minimum yield strength. The grades are approved to NACE MR0175 up to hardness levels of 40 HRC and 43 HRC maximum for the alloys 725 and alloy 725HS, respectively. The higher strength level of alloy 725HS offers higher strength for sour well service compared with the traditionally used alloy 718 (UNS N07718). Corrosion data is also presented showing the performance of the age-hardenable nickel alloys in seawater, resisting chloride stress corrosion cracking, and in sour well environments using the slow strain rate and C-ring test methods. Alloys 725 and 725HS are also shown to be suitable candidate materials in severely corrosive high temperature oil patch environments. Sour environments in which alloys 725 and 725HS have met the criteria for corrosion resistance are defined with and without free sulfur. Keywords: nickel-base alloys, sour environments, corrosion resistance, age-hardened, high-strength, bar, oil field
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Picture for 03126 PHYSICAL METALLURGY OF ALLOYS 718,
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03126 PHYSICAL METALLURGY OF ALLOYS 718, 725, 725HS, 925 FOR SERVICE IN AGGRESSIVE CORROSIVE ENVIRONMENTS

Product Number: 51300-03126-SG
ISBN: 03126 2003 CP
Author: Sarwan Mannan, Ed Hibner, and Brett Puckett
Publication Date: 2003
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Nickel-base alloys 718, 725, and 925 are commonly used in oil and natural gas production.  Being heavily alloyed multi-component systems; these materials require special consideration for processing and heat treatments.  This paper shows the effect of intergranular precipitates on mechanical properties and  slow strain rate (SSR) test results in sour oil patch environments.

 
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51312-01095-UNS N07725 NICKEL ALLOY CONNECTION FAILURE

Product Number: 51312-01095-SG
ISBN: 01095 2012 CP
Author: Steve S. Shademan
Publication Date: 2012
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Picture for Susceptibility to Hydrogen Induced Stress Cracking of Alloy 718 and Alloy 725 Under Cathodic Polarization
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Susceptibility to Hydrogen Induced Stress Cracking of Alloy 718 and Alloy 725 Under Cathodic Polarization

Product Number: 51315-5597-SG
ISBN: 5597 2015 CP
Author: Gaute Stenerud
Publication Date: 2015
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 A test project to examine the susceptibility of Hydrogen Induced Stress Cracking (HISC) has been executed. In this project hydrogen charged samples of Alloy 718 and Alloy 725 have been exposed under tensile stress to establish critical stress levels for initiation of HISC.
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