Alloying and smelting process of steel for semi-high-speed steel roll in intermediate frequency furnace of black tungsten concentrate
A semi-high-speed steel and intermediate frequency furnace technology, applied in the field of iron and steel metallurgy, can solve the problems of unfavorable alloy element recovery, unstable tungsten recovery rate, etc., and achieve the effect of improving the quality of molten steel
Active Publication Date: 2021-10-26
JIANGSU UNIV
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Embodiment 1
[0023] In a steel factory, the 5t intermediate frequency furnace produces S·HSS semi-high-speed steel roll steel, and the amount of molten steel in each furnace is controlled according to 5t.
[0024] The components of the purchased black tungsten concentrate are as follows (mass percentage): WO 3 65%, S 0.5%, P 0.03%, SiO 2 5%. The mineral powder is ground and screened, the particle size reaches 50 mesh or more (particle diameter<0.27mm), the reducing agent is silicon carbide with a purity of 80%, the binder is water glass, and the ratio of mineral powder, reducing agent and binder is 80 : 15:5 ratio in a stirred tank, pressed into balls with a diameter of 2cm, and dried in an oven at 200°C for 3 hours before use.
[0025] The internal control standards for the chemical composition of the smelted semi-high-speed steel S·HSS are as follows (wt%): C 0.80-1.10, Si 1.00-1.40, Mn 0.70-0.90, Cr 5.00-6.00, Ni 0.30-0.50, Mo 3.50-4.00, V 0.80 ~1.00, W1.60~1.90, P≤0.030, S≤0.025. ...
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The invention relates to a process for alloying and smelting steel S·HSS containing semi-high-speed steel rolls in an intermediate frequency furnace of black tungsten concentrate, belonging to the field of iron and steel metallurgy. In the invention, the ground wolframite concentrate, reducing agent and binder are mixed and pressed according to a certain ratio to make balls, which are dried and used for later use. First add some iron and steel materials to fill 1 / 3 of the volume of the intermediate frequency furnace. According to the batching plan, the tungsten concentrate pellets are weighed and put into the iron bucket with holes on the top and hoisted into the furnace. Lime and fluorite are added to the furnace to make slag. Then continue to add iron and steel material to fill the furnace, and smelt it with electricity. After all the iron and steel materials are melted, aluminum powder is added to the slag surface for further reduction. By adopting the invention, the recovery rate of tungsten element in black tungsten concentrate in the intermediate frequency furnace can reach more than 95% stably, and the recovery rate of manganese element can reach more than 90%, which reduces the purchase cost of tungsten and manganese alloy. The invention not only achieves the purpose of recovering alloy elements, but also improves the quality of molten steel for casting.
Description
technical field [0001] The invention relates to a process for alloying and smelting steel S·HSS containing semi-high-speed steel rolls in an intermediate frequency furnace of black tungsten concentrate, belonging to the field of iron and steel metallurgy. Background technique [0002] The roll is a consumable part in the steel rolling process, and the life of the roll directly affects the operating rate and production cost of the rolling mill. The semi-high-speed steel roll has high hardness, wear resistance and thermal stability, and has a long service life, which can reduce the number of roll changes and improve the operating rate of the rolling mill, and has been widely used. Tungsten plays an important role in semi-high-speed steel, improving the hardness, wear resistance and red hardness of the steel. At the same time, tungsten is a rare metal and an important resource for war preparation. It is expensive. In recent years, the price of tungsten metal has reached more t...
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IPC IPC(8): C22B1/243C22B5/06C21C5/52C21C7/00
CPCY02P10/20
Inventor 李亚波赵文涛王亚楠宋金鹏孙国辉刘绍康高辉
Owner JIANGSU UNIV