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Sour Gas and Hydrogen Embrittlement Resistance of High-Strength UNS N07022 Alloy for Oil and Gas App

Picture for Sour Gas and Hydrogen Embrittlement Resistance of High-Strength UNS N07022 Alloy for Oil and Gas App
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Recent results of sour gas and hydrogen embrittlement testing of CW N07022 alloy will be presented. The test results of CW N07022 alloy will demonstrate that it offers superior properties to precipitation-strengthened Ni-base alloys for demanding oil and gas applications.

Product Number: 51317--9479-SG
ISBN: 9479 2017 CP
Author: Jeremy L. Caron
Publication Date: 2017
Industries: Materials Selection and Design , Science of Corrosion
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$20.00
$20.00

N07022 is a Ni-21Cr-17Mo (wt.%) alloy that has found success in applications requiring corrosion resistance and high strength which it achieves in the cold-worked condition. The attributes of N07022 alloy make it an excellent candidate for many oil and gas applications. It has been incorporated in the NACE MR0175 / ISO15156 and NACE MR0103 / ISO 17945 standards at the highest test levels. It has also shown resistance to the NACE Level VII environment with 5 g/L elemental sulfur at 205°C (401°F) and to the demanding conditions of 25% NaCl + 1000 psi (6.9 MPa) CO2 + 1000 psi (6.9 MPa) H2S at 288°C (550°F). As higher strength alloys are becoming more common in high-pressure high-temperature (HPHT) oil and gas service there have been a number of reported failures involving precipitation-strengthened Ni-base alloys. These failures were attributed to hydrogen embrittlement. Recent results of sour gas and hydrogen embrittlement testing of cold-worked N07022 alloy will be presented. The test results and properties of cold-worked N07022 alloy will be compared to those for precipitation-strengthened Ni-base alloys. Overall the results demonstrate that N07022 alloy is currently the best alloy for demanding oil and gas applications.

Key words: Nickel-Base Alloys, Ni-Cr-Mo, N07022, C-22HS, Cold Work, NACE MR0175, Sour Gas, Hydrogen Embrittlement

N07022 is a Ni-21Cr-17Mo (wt.%) alloy that has found success in applications requiring corrosion resistance and high strength which it achieves in the cold-worked condition. The attributes of N07022 alloy make it an excellent candidate for many oil and gas applications. It has been incorporated in the NACE MR0175 / ISO15156 and NACE MR0103 / ISO 17945 standards at the highest test levels. It has also shown resistance to the NACE Level VII environment with 5 g/L elemental sulfur at 205°C (401°F) and to the demanding conditions of 25% NaCl + 1000 psi (6.9 MPa) CO2 + 1000 psi (6.9 MPa) H2S at 288°C (550°F). As higher strength alloys are becoming more common in high-pressure high-temperature (HPHT) oil and gas service there have been a number of reported failures involving precipitation-strengthened Ni-base alloys. These failures were attributed to hydrogen embrittlement. Recent results of sour gas and hydrogen embrittlement testing of cold-worked N07022 alloy will be presented. The test results and properties of cold-worked N07022 alloy will be compared to those for precipitation-strengthened Ni-base alloys. Overall the results demonstrate that N07022 alloy is currently the best alloy for demanding oil and gas applications.

Key words: Nickel-Base Alloys, Ni-Cr-Mo, N07022, C-22HS, Cold Work, NACE MR0175, Sour Gas, Hydrogen Embrittlement

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