| 主权项 |
1. A method of manufacturing a duplex stainless steel sheet having a high nitrogen content and good surface quality through a twin roll strip casting process by supplying molten steel between two casting rolls rotating in opposite directions, the method comprising:
before the molten steel is supplied to the casting rolls, maintaining the nitrogen content of the molten steel at 2500 ppm or less, the molten steel comprising, by wt %, carbon (C): 0.02% to 0.06%, chromium (Cr): 19.0% to 21.0%, manganese (Mn): 2.8% to 3.2%, silicon (Si): 0.55% to 0.8%, nickel (Ni): 0.5% to 1.5%, nitrogen (N): 2200 ppm or greater, and a balance of iron (Fe) and inevitable impurities. |
