Method for adding nitrogen into steel ladle
A ladle and molten steel technology, applied in the field of ladle nitrogen increase, can solve problems such as increased production costs
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[0045] In this embodiment, the duplex steel series steel grade (S31803) is taken as an example, and the amount of molten steel for tapping is 45t.
[0046] The mass percentage ratio of the chemical composition of this steel type is:
[0047] C: 0.01%~0.03% Si: 0.40%~0.60% Mn: 1.0%~1.5% P≤0.03% S≤0.003% Cr: 22.00%~23.00% Ni: 5.00%~5.50% N: 0.1500%~0.1800% Mo: 3.00% to 3.50%
[0048] The rest is Fe and unavoidable impurities.
[0049] After the AOD taps the steel, the components are sampled and analyzed in the ladle as follows:
[0050] C: 0.019% Si: 0.478% Mn: 1.11% P: 0.027% S: 0.002% Cr: 22.46% Ni: 5.13% N: 0.1395% Mo: 3.182%
[0051] The rest is Fe and unavoidable impurities.
[0052] It can be seen that the N content is 1395ppm, which is lower than the target lower limit of 1500ppm, and other components meet the control requirements, so it is necessary to increase nitrogen in LF to make the nitrogen content meet the control requirements.
[0053] This embodiment is the...
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