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The aim of the new hydrogen-based process is to be able to produce steel with the lowest CO2 emissions. The project costs amount to around 65 million euros. In addition, a cooperation agreement with the University of Freiberg is planned to test the procedure in the coming years at the Hamburg plant premises.
Hydrogen steelmaking for a low-carbon economy | SEI
The hydrogen-based reduction of iron ore will initially take place on a demonstration scale with an annual production of , tonnes. In the process, the separation of H2 with a purity of more than 95 percent from the top gas of the existing plant should be achieved by so-called pressure swing adsorption.
The process is first tested with grey hydrogen generated at gas separation to allow for economical operation. In the future, the plant should also be able to run on green hydrogen generated from renewable sources when it is available in sufficient quantities. With the Hamburg hydrogen project, ArcelorMittal is advancing pioneering technology for direct CO2 avoidance as one of several potential pathways for low-emissions steelmaking.
The Group is already investing more than million euros in various carbon emissions reduction technologies, for example in Ghent where waste carbon gases will be used for the production of alternative fuels or in chemical products. Likewise, methods are tested in which biocoal from waste wood is used instead of coking coal as a reducing agent in the blast furnace. ArcelorMittal is committed to climate protection.
With its multi-technology approach, the Group wants to make an active contribution to achieving the ambitious climate and energy policy goals of the Paris agreement and to identify which technologies are technically and economically feasible to reduce, capture or avoid CO2 emissions. With a production volume of 8 million tonnes crude steel, ArcelorMittal is among the largest steel producers in Germany. Its customers come from the automotive and construction industry, as well as from the packaging and household appliances sector. The group runs four large production sites in the country.
Moreover the group has seven steel service centers and 16 distribution centers in the federal republic. ArcelorMittal employs more than 9, people in Germany. Guided by a philosophy to produce safe, sustainable steel, we are the leading supplier of quality steel in the major global steel markets including automotive, construction, household appliances and packaging, with world-class research and development and outstanding distribution networks.
Through our core values of sustainability, quality and leadership, we operate responsibly with respect to the health, safety and wellbeing of our employees, contractors and the communities in which we operate. For us, steel is the fabric of life, as it is at the heart of the modern world from railways to cars and washing machines.
With a geographically diversified portfolio of iron ore and coal assets, we are strategically positioned to serve our network of steel plants and the external global market. While our steel operations are important customers, our supply to the external market is increasing as we grow.
Skip to main content. This will build an inherent resistance to this process and reduce the need of post processing or constant monitoring for failure. Certain metals or alloys are highly susceptible to this issue so choosing a material that is minimally affected while retaining the desired properties would also provide an optimal solution. Much research has been done to catalog the compatibility of certain metals with hydrogen.
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Similar tests can also be used during QC to more effectively qualify materials being produced in a rapid and comparable manner. If steel is exposed to hydrogen at high temperatures, hydrogen will diffuse into the alloy and combine with carbon to form tiny pockets of methane at internal surfaces like grain boundaries and voids. This methane does not diffuse out of the metal, and collects in the voids at high pressure and initiates cracks in the steel. This selective leaching process is known as hydrogen attack , or high temperature hydrogen attack, and leads to decarburization of the steel and loss of strength and ductility.
Copper alloys which contain oxygen can be embrittled if exposed to hot hydrogen. The hydrogen diffuses through the copper and reacts with inclusions of Cu 2 O, forming H 2 O water , which then forms pressurized bubbles at the grain boundaries. This process can cause the grains to literally be forced away from each other, and is known as steam embrittlement because steam is produced, not because exposure to steam causes the problem.
A large number of alloys of vanadium, nickel, and titanium absorb significant amounts of hydrogen. This can lead to large volume expansion and damage to the crystal structure leading to the alloys becoming very brittle. This is a particular issue when looking for non-palladium based alloys for use in hydrogen separation membranes.
For steels, it is important to test specimens in the lab that are at least as hard or harder than the final parts will be. Ideally, specimens should be made of the final material or the nearest possible representative, as fabrication can have a profound impact on resistance to hydrogen-assisted cracking.
Swedish steel plant to run on hydrogen
There are many other related standards for hydrogen-assisted or hydrogen-induced cracking aka hydrogen embrittlement :. Reliable modeling of hydrogen embrittlement is hindered by its complexity and the uncertainties that surround the understanding of the underlying physical mechanisms.
Numerous hydrogen-interaction mechanisms have been postulated, spanning a wide range of scales .
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As argued by several authors, the most plausible scenario is that several mechanisms are acting in concert, with one dominating others within specific regimes . The predictive capabilities of hydrogen embrittlement models have improved significantly through the years, with current models being able to reproduce laboratory test data with few fitting parameters. Most of these models rely on the hydrogen-enhanced decohesion mechanism   , the hydrogen-enhanced localized plasticity mechanism  or a combination of both .
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‘Steeling’ from fossil fuels: Austrians to power steel industry entirely on clean hydrogen!
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