34crmo round pipe billet with a diameter of 350 mm and its refining and casting method
A billet and round tube technology, which is applied in the field of smelting and casting of 34CrMo round tube billets and 34CrMo round tube billets to avoid brittle fracture, improve uniformity and improve usability.
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Embodiment 1
[0037] A steelmaking plant adopts 120t converter smelting → LF furnace refining → RH refining → four-machine four-strand casting machine φ350mm section continuous casting to produce 34CrMo round tube billet. At the end of converter blowing, the end point carbon is controlled at 0.08%, the end point phosphorus is 0.008%, the end point temperature is controlled at 1670°C, and the ladle slag thickness is controlled at 71mm.
[0038] When the molten steel arrives at the LF refining furnace, the molten steel fluctuates slightly for argon blowing, and there is no major overturning phenomenon. The outbound Als is controlled at 0.040%. , the fixed temperature is 1600℃, LF outbound [S] is 0.005%, [S]+[P] is 0.017%.
[0039] After the molten steel arrives at the station, the RH refining argon blowing flow rate is controlled at 1235NL / min, the treatment time is 12 minutes when the vacuum degree is less than 3mbar, and the argon blowing is 7 minutes after the vacuum treatment is completed...
Embodiment 2
[0043] A steelmaking plant adopts 120t converter smelting → LF furnace refining → RH refining → four-machine four-strand casting machine φ350mm section continuous casting to produce 34CrMo round tube billet. At the end of converter blowing, the end point carbon is controlled at 0.10%, the end point phosphorus is 0.007%, the end point temperature is controlled at 1674°C, and the ladle slag thickness is controlled at 80mm.
[0044] When the molten steel arrives at the LF refining furnace, the molten steel fluctuates slightly for argon blowing, and there is no overturning phenomenon. The outbound Als is controlled at 0.050%. After the refining is completed, the molten steel is softly blown with argon. Finally, the fixed temperature is 1620°C, the outbound [S] of LF is 0.007%, and [S]+[P] is 0.019%.
[0045] After the molten steel arrives at the station, the RH refining argon blowing flow rate is controlled at 1100NL / min, the treatment time is 11 minutes when the vacuum degree is ...
Embodiment 3
[0049] A steelmaking plant adopts 120t converter smelting → LF furnace refining → RH refining → four-machine four-strand casting machine φ350mm section continuous casting to produce 34CrMo round tube billet. At the end of converter blowing, the end point carbon is controlled at 0.06%, the end point phosphorus is 0.010%, the end point temperature is controlled at 1690°C, and the ladle slag thickness is controlled at 62mm.
[0050] When the molten steel arrives at the LF refining furnace, the molten steel fluctuates slightly for argon blowing, and there is no major overturning phenomenon. The outbound Als is controlled at 0.043%. After the refining is completed, the molten steel is softly blown with argon. Afterwards, the fixed temperature is 1613°C, the outbound [S] of LF is 0.006%, and [S]+[P] is 0.015%.
[0051] After the molten steel arrives at the station, the RH refining argon blowing flow rate is controlled at 1400NL / min, the treatment time is 11.6min when the vacuum degr...
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Abstract
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