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Smelting method of tungsten-containing stainless steel
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A smelting method and stainless steel technology, applied in the direction of manufacturing converters, etc., can solve the problems of poor molten steel purity, inclusions, and unsuitable production of steel types with high tungsten content, so as to reduce the smelting cost and improve the recovery rate.
Active Publication Date: 2015-03-04
SHANXI TAIGANG STAINLESS STEEL CO LTD
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The application number is 201310529632.2 "A Method for Adding High-melting Point and High-Density Alloy to LF Refining Furnace" describes a method of adding ferro-tungsten to LF refining furnace. This invention requires adding ferro-tungsten in small quantities and in multiple batches. , it takes a long time to melt and decompose, so it is not suitable for the production of steel grades with high tungsten content
In addition, LF is a process before casting. Adding a large amount of alloy will easily cause a large number of inclusions, resulting in poor purity of molten steel.
Method used
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Embodiment 1
[0040] The type of steel smelted in this embodiment is 1Cr12W1MoV.
[0041] This embodiment is the following sequential steps:
[0042] I Desiliconization hot metal dephosphorization
[0043] Desiliconized molten iron (Si=0.10%) is dephosphorized by spraying method, 73 tons of molten iron, temperature measurement and sampling after treatment, molten iron temperature: 1286 ° C, the weight percentage of the composition of molten iron is:
[0044] C 3.6%; Si 0.01%; Mn 0.05%; P 0.01%; S 0.028%;
[0048] Mix the molten iron into the K-OBM-S converter and then measure the temperature. The temperature of the molten iron is 1272°C. Then add 400kg of coke into the furnace, put down the oxygen lance to blow oxygen for decarburization, and enter the first stage of oxygen blowing decarburization. During this period, the oxygen lance Position 2.1m, top lance ...
Embodiment 2
[0066] The type of steel smelted in this embodiment is 2Cr12NiMo1W1V.
[0067] This embodiment is the following sequential steps:
[0068] I Desiliconization hot metal dephosphorization
[0069] Desiliconized molten iron (Si=0.12%) is dephosphorized by spraying method. The amount of molten iron is 74 tons. After the treatment, the temperature is measured and sampled. The temperature of the molten iron is 1281 ° C. The weight percentage of the composition of the molten iron is:
[0070] C 3.7%; Si 0.02%; Mn 0.05%; P 0.007%; S 0.024%;
[0074] Put the molten iron into the K-OBM-S converter and then measure the temperature. The temperature of the molten iron is 1261°C. Then add 410kg of coke into the furnace, put down the oxygen lance to blow oxygen for decarburization, and enter the first stage of oxygen blowing decarburization. During this period,...
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Abstract
The invention relates to a smelting method of tungsten-containing stainless steel. The smelting method comprises the following steps: desiliconized molten iron dephosphorization, K-OBM-S smelting, VOD refining, LF ladle refining and mold casting. The smelting method is characterized by comprising the following step: adding barreled tungsten iron in a material trough after first-stage oxygen blowing of K-OBM-S decarbonization ends, wherein the block size range of the tungsten iron is 10-130mm, and the quantity of broken blocks with the block size of less than 10*10mm cannot exceed 5% of the total weight of the batch of the tungsten iron; and K-OBM-S bottom blowing argon cannot be less than 40Nm<3> / min. The smelting method of the tungsten-containing stainless steel disclosed by the invention is high in recovery rate of tungsten and low in smelting cost.
Description
technical field [0001] The invention relates to a method for smelting tungsten-containing stainless steel. Background technique [0002] Tungsten-containing stainless steel has good wear resistance. Tungsten in steel can increase the tempering stability, red hardness and thermal strength of steel. Tungsten-containing stainless steel is mainly used in high-speed steel, tool steel, hot forging die steel, etc. [0003] Due to the high melting point of tungsten, it is necessary to use ferro-tungsten for alloying, and the melting temperature of ferro-tungsten with a tungsten content of 75-85% is also higher than 2500°C, while the temperature of molten steel in the molten steelsmelting process is generally lower than 2000°C, so tungsten yield is lower. Application No. 02139621.3 "A Method for Smelting Ferro-Tungsten with Scheelite Concentrate" only briefly described the smelting of ferro-tungsten with tungsten concentrate, but did not explain how to add it to steel. The applica...
Claims
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