Alloying method adding manganese ore in RH refining process
A refining process and alloying technology, which is applied in the field of steelmaking process using manganese ore alloying, can solve the problems of increased oxygen content in molten steel, excessive inclusions, and increased consumption of reducing agents, so as to improve reducing ability and reduce steelmaking cost, yield improvement effect
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Embodiment 1
[0022] The chemical composition of embodiment steel grade is:
[0023] C:0.0015%-0.0035%;Si:0.01%-0.03%;Mn:0.10%-0.20%;P:≤0.015%;S:≤0.010%;Als:0.015%-0.045%; %.
[0024] 1) The starting temperature of RH treatment is 1590℃.
[0025] 2) Before RH alloying, add manganese ore in 3 batches through the alloy chute, the particle size of the added manganese ore is between 15-35mm, and the phosphorus and sulfur contents of the manganese ore are less than 0.05%. The amount of manganese ore added is 400kg. Based on the calculation of 100 tons of steel, the actual amount of manganese ore added is 4kg / ton of steel.
[0026] 3) After adding manganese ore, the RH riser gas flow is controlled at 135NM 3 / h; the cycle time is 7min; the vacuum chamber pressure is 50Pa.
[0027] 4) After the cycle operation is completed, since the manganese content in the steel reaches 0.14%, which meets the lower limit requirements of the steel grade, there is no need to add manganese-containing ferroalloy...
Embodiment 2
[0030]C:0.01%-0.03%;Si:0.01%-0.03%;Mn:0.18%-0.25%;P:≤0.015%;S:≤0.015%;Als:0.025%-0.055%.
[0031] 1) The initial temperature of RH treatment is 1595°C.
[0032] 2) Before RH alloying, add manganese ore through the alloy chute in 5 batches, the particle size of the added manganese ore is between 15-35mm, and the phosphorus and sulfur contents of the manganese ore are less than 0.05%. The amount of manganese ore added is 550kg. Based on the calculation of 100 tons of steel, the actual amount of manganese ore added is 5.5kg / ton of steel.
[0033] 3) After adding manganese ore, the RH riser gas flow is controlled at 145NM 3 / h, the cycle time is 9min; the vacuum chamber pressure is 140Pa.
[0034] 4) After the cycle operation is completed, since the manganese content in the steel has reached 0.20%, which has met the lower limit requirements of the steel grade, there is no need to add manganese-containing ferroalloys such as ferromanganese and ferrosilicon manganese for adjustmen...
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