Method for manufacturing duplex stainless steel sheet having high nitrogen content and good surface quality
A technology of surface quality and nitrogen content, which is used in the field of preparing duplex stainless steel sheets with high nitrogen content and good surface quality, and can solve the problems of continuous casting process and ingot casting process of high nitrogen duplex stainless steel which are difficult to be solved.
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Embodiment 1
[0038] use as Figure 4 The indicated molten steel with nitrogen content and figure 1 The illustrated twin roll thin strip caster 100 was run 32 times through the process of making high nitrogen duplex stainless steel plate and the occurrence of surface swelling was observed. The observation results are shown in Figure 4 , where the nitrogen content leading to surface swelling is indicated by the arrow. Molten steel contains, in wt%: carbon (C): 0.03%, chromium (Cr): 20.0%, manganese (Mn): 3.1%, silicon (Si): 0.7%, nickel (Ni): 1.2%, and the remainder Amount of iron (Fe) and unavoidable impurities. In addition, the temperature of the molten steel is kept within the range of 1525°C±5°C, and the rolling force of the roll 110 is 8 tons. As a result, surface swelling does not occur when the nitrogen content of molten steel is 2500 ppm or less as proposed by the present invention. However, when the nitrogen content of molten steel is greater than 2500 ppm, surface swelling oc...
Embodiment 2
[0040] Preparation of molten steel, which contains, in wt %: carbon (C): 0.03%, chromium (Cr): 20.0%, manganese (Mn): 3.1%, silicon (Si): 0.7%, nickel (Ni): 1.2% , and the balance of iron (Fe) and unavoidable impurities. Adjust the nitrogen content and temperature of the molten steel as shown in Table 1, and use the molten steel and figure 1 The illustrated twin roll thin strip caster 100 produces high nitrogen duplex stainless steel plate. Then, the surface swelling of the high nitrogen duplex stainless steel plate was observed, as shown in Table 1. The results shown in Table 1 are plotted on the Figure 5 middle.
[0041] Table 1
[0042]
[0043] *IS: Sample of the present invention, **CS: Comparative sample
[0044] as table 1 and Figure 5 It is shown that when the nitrogen content of molten steel is 2500 ppm or more, surface swelling can be prevented from occurring by adjusting the temperature of molten steel as proposed by the present invention (inventive sampl...
Embodiment 3
[0046] Preparation of molten steel, which contains, in wt %: carbon (C): 0.03%, chromium (Cr): 20.0%, manganese (Mn): 3.1%, silicon (Si): 0.7%, nickel (Ni): 1.2% , and the balance is iron (Fe) and unavoidable impurities. Adjust the nitrogen content and temperature of the molten steel as shown in Table 2, and use the molten steel and figure 1 The shown two-roll strip casting mill 100 prepares high-nitrogen duplex stainless steel plates, and at the same time adjusts the rolling force of the rolls 110 as shown in Table 2. Then, the surface swelling of the high nitrogen duplex stainless steel plate was observed, as shown in Table 2.
[0047] Table 2
[0048]
[0049] *IS: Sample of the present invention, **CS: Comparative sample
[0050] As shown in Table 2, when the roll 110 applied a rolling force of 8 tons to the high nitrogen duplex stainless steel plate (comparative sample 7) over the width of the roll 110 of 1312 mm, surface swelling was observed from the high nitrogen...
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