Electroslag premelted slag for smelting low-phosphprpis steel and method for smelting low-phosphprpis steel
A technology for electroslag premelting and low phosphorus steel, which is applied in the fields of electroslag premelting and smelting low phosphorus steel, and can solve the problem of strict requirements on P content of consumable electrodes, increased cost of electroslag remelting, and large amount of phosphorus returned to molten steel. and other problems, to meet the requirements of low cost, reduce P content, and inhibit the effect of phosphorus reversion in molten steel
Inactive Publication Date: 2015-10-21
HEBEI IRON AND STEEL
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Problems solved by technology
Commonly used low-grade 433-type electroslag pre-melted slag is cheap and easy to produce, but the P in the slag 2 o 5 The content is relatively high, generally more than 0.025wt%, and some are more than 0.06wt%. When the electroslag remelted low-phosphorus (w(P)≤0.008%) steel uses the above-mentioned pre-melted slag, the P content of the consumable electrode The requirements are harsh, and often due to the large amount of phosphorus returned to the molten steel, it cannot meet the requirements of the P content of the steel bell
When using high-grade pre-melted slag with less impurity content, the cost of electroslag remelting will be greatly increased
Method used
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Embodiment 1－5
[0011] Embodiment 1-5: The method for smelting low-phosphorus steel adopts the following electroslag pre-melting slag and smelting steps.
[0012] (1) Non-vacuum induction furnace smelting and casting 1250kg NRT55B2 welding wire steel ingot as consumable electrode for electroslag remelting, its chemical composition (mass fraction) is: C 0.097%, Si 0.753%, Mn 0.618%, P 0.006% , S 0.01%, Cr 1.46%, Ni 0.16%, Mo 0.539%, Ca 0.0005%, and the balance is iron and unavoidable impurities. After electroslag remelting, P and S in the electroslag ingot of welding wire steel are required to be below 0.008%.
[0013] (2) After crushing and sieving the returned electroslag slag, respectively, according to 100% 433 type pre-melted slag (comparative example), 60% 433 type pre-melted slag + 40% electroslag returned slag (Example 1) , 55% 433 type pre-melted slag + 45% electroslag return slag (embodiment 3), 52% 433 type pre-melt slag + 48% electro slag return slag (embodiment 4), 50% 433 type p...
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The invention discloses electroslag premelted slag for smelting low-phosphprpis steel and a method for smelting low-phosphorous steel. The electroslag premelted slag is formed by mixing type 433 electroslag premelted slag and returned slag of the type 433 electroslag premelted slag. According to the electroslag premelted slag, the content of P2O5 in the slag can be significantly lowered by adding the returned slag in the low-grade type 433 electroslag premelted slag; by adopting the electroslag premelted slag, the molten steel rephosphorization of the electroslag remelting slag-metal interface can be effectively inhibited, the requirements of electroslag remelting on the consumable electrode P content of the low-phosphorous steel can be lowered, the electroslag smelted slag cost can be saved, and meanwhile the comprehensive utilization of electroslag castaway slag can be achieved. The electroslag premelted slag has the advantages of being economical, friendly to environment and small in P2O5 impurity content, and can effectively meet the requirements of the low-phosphorous steel for the P content and lower the production cost.
Description
technical field [0001] The invention belongs to the technical field of steelmaking, in particular to an electroslag pre-melted slag for smelting low-phosphorus steel and a method for smelting low-phosphorus steel. Background technique [0002] The composition of 433 type premelted slag for electroslag remelting is 40%CaF 2 -30%CaO-30%Al 2 o 3 , According to different impurity content, the price difference is very large. Commonly used low-grade 433-type electroslag pre-melted slag is cheap and easy to produce, but the P in the slag 2 o 5 The content is relatively high, generally more than 0.025wt%, and some are more than 0.06wt%. When the electroslag remelted low-phosphorus (w(P)≤0.008%) steel uses the above-mentioned pre-melted slag, the P content of the consumable electrode The requirements are harsh, and often due to the large amount of phosphorus returned to molten steel, the requirements for P content in steel bells cannot be met. When using high-grade pre-melted s...
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Inventor 李双江翟永臻张福利
Owner HEBEI IRON AND STEEL