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RH vacuum powder injection refining device and powder injection method thereof
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Circular seam type gas supply element and gas supply method
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Automatic slag layer thickness measuring device and method
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Slag layer thickness measuring device and method
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Multifunctional rolling friction wear testing machine
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High-performance high-capacity hydrogen storage alloy for fuel cell and preparation method thereof
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Low alloy steel for high heat input welding and preparation method thereof
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Welding material for high-toughness, corrosion-resistant and fire-resistant low-alloy high-strength steel
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P in phosphorus-containing steel slag is improved2O5Method for improving citric acid solubility
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Getter film and preparation method thereof
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