Smelting process for improving near-surface flaw detection defects of shaft rudder system steel
A near-surface, shaft-rudder system technology, applied in the field of steel, can solve problems such as restricting the development of shaft-rudder systems and ship parts, and achieve the effects of improving the qualified rate of flaw detection, reducing the scrap rate and improving economic benefits.
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[0038] A smelting process for improving near-surface flaw detection defects of shaft and rudder steel, comprising the following steps:
[0039] 1) Converter tapping carbon ≥ 0.06%, tapping phosphorus ≤ 0.012%; converter tapping temperature 1610-1660°C.
[0040] Add steel core aluminum 150-280 kg during the tapping process; add lime 600-800 kg; add pre-melted slag 300-500 kg; feed aluminum wire 150-200 meters after tapping.
[0041] 2) SiC deoxidation for refining, 400-600 kg; refining white slag time: 43-60 minutes;
[0042] 3) Holding time under high vacuum: 25-30 minutes. During the vacuum holding period, it is necessary to observe that the molten steel surface is obviously exposed to ensure the vacuum degassing effect.
[0043] 4) After the VD is broken, feed 250-300 meters of manganese nitride wire; feed 40-80 meters of calcium wire. VD soft blowing time: 25-30 minutes;
[0044] 5) When pouring molten steel, the superheat of the hanging bag: 105-120°C; add 100-200 kg of...
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