Metals have been the greatest contribution to the development and growth of civilization. We tend to use material without understanding its importance, scarcity, and future necessity. Some of the materials are so influential that we have named certain time periods after them as the stone age, the bronze age, and many more.
Steel production was initiated 4,000 years ago. Evolutions have enabled the development of various types of steel. Since then numerous ways are used to utilize metal and comprise its use. Construction Industry incorporated steel's major use from the 1880s. Since then numerous types of metal are used worldwide.
Steel Journey:
The journey of steel started with Bronze. Bronze got replaced with cast iron
as it was cheap to manufacture and possesses the ability to reuse most of the time. Being that, cast iron also has the ability to explode, the better material developed with low-carbon content is wrought iron. Low carbon content made the wrought iron lot softer. But the required compensation is made by Steel as it includes carbon content from 0.2 to 2 %.
We can't imagine that various things would not have existed without the presence of steel, no bridges, no buildings, no machines, and no other strong structures. Steel has high tensile strength, is lightweight, and has design adaptability that is available within optimal cost.
How Steel is made?
Starting with creating an iron that includes raw materials such as lime, coal, and iron ore. All this material is heated at a high temperature and melted down to molten iron or hot metal. Iron includes the impurities, these impurities are removed forming it into pig steel. Pig iron is alloyed with another mineral. The carbon roles start when the oxygen is forced during heating. Here carbon and other impurities all are taken out. We get raw steel then the molten steel is made hard, in hot state only the steel is removed then next step for primary forging is followed. Then the steel is formed into shapes through hot rolling. Quality steel is achieved while removing the defects. The steel is created in the final shape with secondary methods like coating, drilling, machining, etc.
Green Steel Journey:
Global steel production is almost 1.86 billion metric tons in 2020. With that 1.85 tonnes of carbon dioxide emission per tonne takes place. More carbon emissions cause global warming. Even though steel is a recyclable material, giving us high-quality metal while achieving environmental sustainability. But steel faces the environmental challenge and hampering the fossil fuel.
Steelmaking is the coal form for carbon input. The high energy required for melting and oxidation, whereas other processes lead to the creation of chemicals and carbon dioxide. Many researchers are carried out to understand the steelmaking and recycling of carbon dioxide.
Sweden has produced the world’s first steel without the use of fossil fuels. This might take us to the road of cutting carbon emissions. Introducing the new term as Green Steel. Green steel runs on zero-carbon making it an environmentally intended transition. This would make a lot of changes and lower the global carbon footprint.
HYBRIT (Hydrogen Breakthrough Ironmaking Technology) leads to producing the byproduct as water but not CO2. HYBRIT Green Steel process is solid iron that is melted with the use of an electric arc furnace that will produce clean-burning gas. So only fossil-free electricity and fuels are used. They are using a hybrid process and replacing coke and carbon with green hydrogen and renewable electricity. It is also considered that the quality and properties of green steel will be the same as normal steel. Just the main difference is fossil-free electricity.
Impact of green steel:
Steel production has a detrimental impact on the environment in all ways. When I say all ways, it means it has air emissions of various gases, then comes wastewater contamination, production of hazardous wastes, and many more.
The steel industry is the largest Carbon dioxide emitter, this binds us to discover low-carbon steelmaking. It became important to find the non-coal-based technology and that is hydrogen-based methods.
Even though the first step has been taken, what will be the future of green steel? Because not everyone would survive this journey of green steel. As HYBRIT is predicted to consume 15 TWh of fossil-free electricity for green steel. This needs the proper supply of carbon-free electricity. Converting the steel industry to green steel is also not that easy. Producing low-carbon steel will definitely be a higher cost than the standard steel production methods. With that, every new thing has a barrier, but there is always a way to come out but that will surely take time. Whereas, green steel will be the biggest solution to tackle environmental issues.
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