Menu
Search
Filters
Close
Menu

Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!

Hydrogen Embrittlement Susceptibility in Corrosion Resistant Materials for Fasteners

Picture for Hydrogen Embrittlement Susceptibility in Corrosion Resistant Materials for Fasteners
Available for download
Product Number: 51323-18763-SG
Author: Hans Husby, Inge Morten Kulbotten, Gisle Rørvik
Publication Date: 2023
$0.00
$20.00
$20.00

In some cases, the materials selection for subsea fasteners requires resistance to corrosion in seawater and, also, adequate hydrogen embrittlement (HE) resistance due to plausible connection to the cathodic protection system. In this work, selected materials were subject to incremental step loading testing under cathodic protection polarization in 3.5 wt% NaCl solution. Testing of 6 individual heats of Alloy 716 (UNS N07716) and 725 (UNS N07725) showed poor HE resistance for several heats, and a worse performance for all heats than a single tested heat of Alloy 718 (UNS N07718) which was included for comparison. Four heats of Alloy 625 (UNS N06625) showed quite varying microstructures, mechanical properties, and, also, HE resistances – with some HE resistances possibly below preferred levels for fastener applications. Two tested strain hardened austenitic materials were Alloy 830 (UNS N08830) and P750 (DIN 1.4675), that both had high fracture stresses considering the materials high yield strengths around 1200 MPa and they are candidate materials for subsea fasteners. A low alloy steel B7 material, included as a reference, showed high HE resistance, but the test method used herein should be modified when testing materials with high yield to tensile strength ratios.

In some cases, the materials selection for subsea fasteners requires resistance to corrosion in seawater and, also, adequate hydrogen embrittlement (HE) resistance due to plausible connection to the cathodic protection system. In this work, selected materials were subject to incremental step loading testing under cathodic protection polarization in 3.5 wt% NaCl solution. Testing of 6 individual heats of Alloy 716 (UNS N07716) and 725 (UNS N07725) showed poor HE resistance for several heats, and a worse performance for all heats than a single tested heat of Alloy 718 (UNS N07718) which was included for comparison. Four heats of Alloy 625 (UNS N06625) showed quite varying microstructures, mechanical properties, and, also, HE resistances – with some HE resistances possibly below preferred levels for fastener applications. Two tested strain hardened austenitic materials were Alloy 830 (UNS N08830) and P750 (DIN 1.4675), that both had high fracture stresses considering the materials high yield strengths around 1200 MPa and they are candidate materials for subsea fasteners. A low alloy steel B7 material, included as a reference, showed high HE resistance, but the test method used herein should be modified when testing materials with high yield to tensile strength ratios.

Product tags
Also Purchased
Picture for Stainless Steels for Automotive Applications – Hydrogen Embrittlement Testing for High Pressure Hydrogen Gas Using Different Methods
Available for download

Stainless Steels for Automotive Applications – Hydrogen Embrittlement Testing for High Pressure Hydrogen Gas Using Different Methods

Product Number: 51323-19241-SG
Author: Ulf H. Kivisakk, Björn Bosbach, Emil Cederberg, Ulrika Borggren, Nian Zhou
Publication Date: 2023
$20.00

Today hydrogen for use as fuel for vehicles is getting more and more attention as an alternative to vehicles using fossil-based fuels. Hydrogen is used in both electric fuel cell cars and in heavy vehicles using direct combustion of hydrogen. Such vehicles require stainless tubing for transport of the hydrogen and for bosses to composite tanks in addition to tubing and fittings in hydrogen fueling stations.

Picture for Strain Hardened Austenitic Corrosion Resistant Alloys’ Susceptibility to Hydrogen Induced Stress Cracking
Available for download

Strain Hardened Austenitic Corrosion Resistant Alloys’ Susceptibility to Hydrogen Induced Stress Cracking

Product Number: 51323-19235-SG
Author: Amrinder P.S. Dhillon, Xu Lu, Roy Johnsen, Ida Westermann
Publication Date: 2023
$20.00

Several offshore field failures in recent years have been attributed to Hydrogen Induced Stress Cracking (HISC) of high strength, highly corrosion resistant Precipitation Hardened Nickel Alloys (PHNA’s) such as UNS N07716, UNS N07718 and UNS N07725.

Hence, HISC is a constant concern regarding subsea components subjected to high tensile stress, and the industry is searching for solutions to their technical needs: High strength corrosion resistant alloys (CRA’s) resistant to seawater (high Pitting Resistance Equivalent number (PREN)) but also resistant to HISC.

For PHNA’s, improved processing (chemical composition limits and processing temperatures) and improved quality control methods as well as refined acceptance criteria are all under consideration.
Picture for Material Selection for Carbon Capture and Storage (CCS) Wells
Available for download

Material Selection for Carbon Capture and Storage (CCS) Wells

Product Number: 51323-18760-SG
Author: Willem Maarten van Haaften, Hisashi Amaya, Bostjan Bezensek, Yuji Arai, Brian Chambers, Hiroki Kamitani
Publication Date: 2023
$20.00

The goal of the Paris Agreement is to limit global warming to below 2°C, preferably 1.5°C, compared to pre-industrial levels.1 While the world is slowly transitioning to more sustainable energy sources to reach this target, one of the ways to reduce the CO2 in the atmosphere is to capture it and store it in depleted gas fields. According to the IOGP1, the total number of CCS projects in Europe is 65 in 2022.2 The aim of these projects is to store around 60 MtCO₂/yr by 2030.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support