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Which refractory bricks can extend the service life of a converter steelmaking process?
2025-10-08
Which refractory bricks can extend the service life of a converter steelmaking process?
① Slag erosion and gas stream erosion are the primary causes of oxidation and mechanical damage during furnace lid cleaning.
② The turret ear shaft area suffers severe erosion from slag, oxidative wear caused by gas flow, and mechanical stress, making it difficult to repair. Therefore, high-quality magnesia-carbon bricks with a carbon content between 16% and 18%, offering high strength and excellent corrosion resistance, should be selected.
③ The slag line is primarily subjected to slag erosion, so high-corrosion-resistant magnesium-carbon bricks are selected.
④ The charging side is not only subject to corrosion from steel slag but also to the impact and erosion caused by molten iron and scrap materials. Therefore, this area utilizes magnesium-carbon bricks, which offer superior resistance to both erosion and thermal shock.
⑤ The iron tapping spout is subject to factors such as oxidation, slag corrosion, rapid temperature fluctuations, and molten steel erosion; therefore, highly oxidation-resistant magnesium-carbon bricks are used.
It is evident that a higher proportion of magnesia-carbon bricks are used in converters. The refractory bricks primarily employed for furnace linings are magnesia-carbon bricks. Magnesia bricks are used for the lining itself, while magnesium-based ramming materials serve as the jointing compounds. Depending on the steelmaking speed, appropriate magnesia-carbon bricks should be selected: for high-production, fast-paced steelmaking processes, low-carbon magnesia-carbon bricks are recommended; whereas for slower steelmaking with longer intervals between heats, high-carbon magnesia-carbon bricks are the better choice.
To extend the service life of a converter, the lifespan of the refractory brick lining directly depends on how long it can withstand operational conditions. This primarily involves two key aspects: First, operational conditions cannot be altered arbitrarily—they are determined by the production processes and product specifications, as well as the expertise of the operators. Second, implementing effective maintenance techniques and conducting regular inspections can significantly enhance the longevity of the furnace lining through advanced furnace protection methods.
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