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Products tagged with 'tensile'

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Picture for Evaluation Of Girth-Welded 22Cr Duplex Stainless-Steel Piping For Susceptibility To Environmentally Assisted Cracking (EAC), Pitting, And General Corrosion In A Sour Environment
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Evaluation Of Girth-Welded 22Cr Duplex Stainless-Steel Piping For Susceptibility To Environmentally Assisted Cracking (EAC), Pitting, And General Corrosion In A Sour Environment

Product Number: 51321-16725-SG
Author: Jing Ning; Peter F. Ellis; Ramesh Rao; Brent Sherar
Publication Date: 2021
$20.00
Picture for Sulfide-Stress Cracking Threshold Stresses and Operational Limits for the Safe Use of UNS S17400 (17–4PH) in Oilfield Services
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Sulfide-Stress Cracking Threshold Stresses and Operational Limits for the Safe Use of UNS S17400 (17–4PH) in Oilfield Services

Product Number: 51320-14431-SG
Author: Manuel Marya
Publication Date: 2020
$20.00

Stainless steel UNS S17400 (17-4PH) has been successfully used in oilfield services outside the traditional NACE MR0175/ISO 15156 limits for permanent equipment. The exact operational envelops of 17-4PH (HH1150), including the tensile threshold stress, sour gas partial pressure, temperature, and exposure time that enable the crack-free usage of 17-4PH (HH1150) are not well established. For service equipment, NACE MR0175/ISO15156 currently provides exemptions from the tight environmental restrictions of permanent equipment, but instead limits the maximum applied stress to a debatable 60% of the specified minimum yield strength (SMYS). In this investigation, the sulfide stress-corrosion cracking of 17-4PH is revisited through 51 new NACE TM0177 Methods A tests conducted over 240 hours minimum (480hrs in certain cases). Under unrestricted sour gas partial pressures, the threshold tensile stress below which cracking does not occur is between 45% and 60% of the SMYS at ambient temperature. Alloy 17-4PH is also less susceptible to sulfide stress cracking as temperature increases from 70°F (21°C) to 350°F (177°C). Risk of sulfide stress cracking is also greatly mitigated when delta ferrite is controlled. With reduced delta ferrite, as provided by two out of three tested heats, and reverted austenite promoted by both chemical composition and longer aging treatments, no cracking is seen at 60% stress level up to 45psi H2S (0.31MPa); at 45% stress level, this value is increased to 120psi (0.83MPa) based on newly-collected test data.