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A kind of pure pig iron prepared by refining outside the furnace
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A technology of refining and pig iron outside the furnace, which is applied in the field of metal materials, can solve problems such as the complexity of the refining process, and achieve the effects of simple production process, convenient operation and high economic benefits
Active Publication Date: 2017-12-19
张占魁
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Problems solved by technology
Its raw materials are high-purity pig iron and carbon scrap steel, the refining process outside the furnace is complicated, and it is only used for machine tool castings
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Embodiment 1
[0036] Step 1: Take 300Kg of pig iron molten iron smelted in the blast furnace, sample and analyze it for batching, transfer it to a 400Kg new induction argon-oxygen powder spraying refining furnace for refining, and ensure that the temperature of the molten iron is between 1250°C and 1450°C;
[0037] Step 2: Spray 6Kg of lime powder, 9Kg of iron oxide powder, 0.8Kg of calcium chloride, and 0.8Kg of calcium fluoride into the furnace with a nitrogen spray gun to carry out desiliconization, desulfurization, dephosphorization, detitanium and other elements. After 20 minutes, take a sampling test, and after confirming that the product composition is qualified, remove the oxidation slag floating on the liquid surface to avoid the phenomenon of phosphorus reversion;
[0038] Step 3: Add 6Kg of lime particles, 1Kg of calcium fluoride particles, and 0.18Kg of aluminum particles into the furnace for deoxidation and desulfurization. After reacting for 15 minutes, take samples for inspect...
Embodiment 2
[0040] Step 1: Take 380Kg of pig iron, sample and analyze it for batching, transfer it to a 400Kg new induction argon-oxygen powder spraying refining furnace for melting and refining, and ensure that the temperature of the molten iron is between 1250°C and 1450°C;
[0041] Step 2, the ingredients are directly mixed with the pig iron block in step 1, that is, 7Kg of lime powder, 11.4Kg of iron oxide powder, 1Kg of calcium chloride, and 1Kg of calcium fluoride are added to desiliconization, desulfurization, dephosphorization, and detitanium at the same time as the pig iron is melted and other elements, the reaction time is 20 minutes, then sampling and testing are carried out. After confirming that the product composition is qualified, remove the oxidation slag floating on the liquid surface to avoid the phenomenon of phosphorus reversion;
[0042] Step 3: Add 7.6Kg of lime particles, 1.30Kg of calcium fluoride particles, and 0.23Kg of aluminum particles into the furnace for deox...
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Abstract
The invention discloses pure pig iron prepared through an external refining method. According to the technical scheme, main elements of the pure pig iron include, by mass, 3.40-3.90% of C, 0.03% or less of Si, 0.03% or less of Mn, 0.005-0.01% of S, 0.003-0.01% of P and 0.003% or less of Ti; other inevitable alloy elements and trace elements include 0.003% or less of Al, 0.010% or less of Cr, 0.010% or less of V, 0.005% or less of Cu, 0.010% or less of Sn, 0.010% or less of Mo, 0.001% or less of Te, 0.001% or less of Bi, 0.001% or less of Pb, 0.010% or less of As, 0.001% or less of Sb and 0.001% or less of B. Molten pig iron smelted in a blast furnace is subjected to external refining in a novel induction argon and oxygen powder spraying refining furnace with the China patent number of CN201120469881.3 so that the purposes can be achieved.
Description
[0001] 1. Field [0002] The invention relates to a pure pig iron and a preparation method thereof, belonging to the field of metal materials. 2. Background technology [0003] At present, the pig iron smelted from ore by blast furnace can be divided into steelmaking pig iron and foundry pig iron according to its use. High-purity pig iron is a special casting pig iron containing SI, Mn, P, S, TI and other impurity elements. The ductile iron produced by it can be successfully used to cast some complex stress, strength, toughness, Parts that require high wear resistance. Although the output of pig iron castings in my country ranks first in the world for ten consecutive years, its purity and chemical composition cannot meet the quality needs of the rapid development of the foundry industry so far. Due to the rapid development of high-strength castings such as automobile manufacturing, wind power generation, nuclear power generation, high-speed rail, and large-scale construction...
Claims
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