The invention discloses a low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting. The slagging and dephosphorizing technique comprises the steps of slag remaining and splashing, primary charging, primary blowing, turning down and deslagging, secondary feeding, secondary blowing, and terminal control and steel tapping, all final slag is reserved for slag splashing after steel tapping, and the steps are repeated circularly. The obtained final slag comprises, 35-48% of CaO, 8-14% of MgO, 8-13% of SiO2, 10.20-18.50% of TFe, and 2.50-5.60% of P2O5, and the alkalinity is 2.5-6. By the adoption of the slagging and dephosphorizing technique, smelting of the high-phosphorus molten iron is integrally optimized; materials, such as high-cost slagging agents, magnesite pellets and light-burned magnesian limestone, are partially or completely replaced by low-cost and environment-friendly sintered and returned mines and raw magnesian limestone, and a corresponding technological system is set; and the extra heat is balanced while smooth dephosphorizing is guaranteed, the slag oxidation, the P2O5 content and the final slag MgO content are improved, the slagging cost is reduced by over 8 yuan/t while a furnace lining is protected and the dephosphorizing effect is achieved, the furnace age is prolonged from 12000 times to 15000 times, and the application value and popularization value are high.

Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting

The invention discloses a smelting method of converter efficient dephosphorization and belongs to the technical field of ferrous metallurgy The smelting method of converter efficient dephosphorization comprises the following steps that after the last time of converter steel tapping, slag splashing furnace protection is conducted, and residual slag is poured out; before converter blowing is started, pre-melted slag is added into a converter; converter blowing is conducted for 4-5 minutes, the oxygen lance position and the oxygen supply intensity are adjusted dynamically according to blowing time; slag pouring operation is conducted; and slag-forming blowing is conducted, at the converter endpoint, the slag basicity R, the mass fraction of magnesium oxide and the mass fraction of ferrous oxide are controlled, and finished steel of which the phosphorus mass fraction is required to be 0010% or below is obtained Through the smelting method of converter efficient dephosphorization, the converter dephosphorization efficiency can be effectively improved, the phosphorus content at the converter endpoint is lowered, and the cost is low

Smelting method of converter efficient dephosphorization

The invention discloses a preparation method for a high-quality 40Cr alloy structural steel hot rolled coil rod. The preparation method comprises the following steps of A, hot metal pretreatment desulfurization, B, molten steel smelting, C, deoxygenation alloying, D, molten steel LF furnace refining, E, molten steel VD furnace vacuum refining, F, molten steel casting, G, billet heating, and H, controlled rolling and controlled cooling. The high-quality 40Cr alloy structural steel hot rolled coil rod produced through the method is high in steel cleanliness and fewer in occluded foreign substance and has high-strength as well as excellent plastic toughness and cold heading machining deformation capacity, the production requirement of a high-level fastener is met, and steel gas content and the occluded foreign are greatly reduced.

Preparation method for high-quality 40Cr alloy structural steel hot rolled coil rod

The invention provides a converter operating method for smelting low-phosphorus steel through high-phosphorus molten iron, and belongs to the technical field of converter smelting. With a 100 t converter as an example, raw materials include 94-96 t of molten iron and 14-16 t of plate edge scrap steel, and 1500-2000 kg of red mud or ore is added along with the scrap steel; at the beginning of blowing, 1500-2000 kg of red mud or ore, 1500-2000 kg of lime, 1500-2500 kg of limestone and 200-500 kg of light burning agents are added firstly, blowing is conducted for 4-6 min, then deslagging is conducted, and the lime and the red mud or the ore are added when blowing is started again; during drying of slag, fluorite is added, and blowing is conducted for 9-11 min; the lime and the red mud or the ore are added again; and in the blowing process, the gun position is 1.4-1.6 m, and the oxygen flow of an oxygen gun is 18000-18500 Nm /h. The converter operating method for smelting low-phosphorus steel through high-phosphorus molten iron has the advantages that the element P in molten iron is effectively removed, and normal smelting of low-phosphorus steel under the high-phosphorus molten iron condition is guaranteed.

Converter operating method for smelting low-phosphorus steel through high-phosphorus molten iron

The invention belongs to the field of ferrous metallurgy, and particularly relates to a method for steel-making and slagging of semi-steel in a converter The method includes the following steps that a, pouring residues in a steel ladle and residual molten steel obtained after continuous casting pouring is finished are poured into a semi-steel tank to be used together; b, semi-steel subjected to vanadium extraction is added into the semi-steel tank; and c, the residues and semi-steel in the semi-steel tank are added into the steel-making converter together, slagging materials are added, and steel-making and slagging of the semi-steel are carried out The method for steel-making and slagging of the semi-steel in the converter is simple in process, optimizes the steel-making process of the semi-steel, effectively lowers temperature loss, auxiliary material loss and steel material loss in the process, realizes efficient recycling of secondary resources, and lowers emission of solid waste

Method for steel-making and slagging of semi-steel in converter

The invention provides a method for heat application of low-alkalinity casting residue in steel-making. The method comprises the following steps that: 5 to 7kg/t of low-alkalinity casting reside of steel slag is added to a converter along with semi-steel under a hot steel state in order to fully utilize the heat of the molten casting residue, and the slag can be quickly generated by blowing for 2 minutes. By adopting the method, the complex slag forming constituent and heating agent requested in a conventional semi-steel smelting process are saved, and the production cost is reduced; the high-alkalinity slag can be quickly formed at low temperature in accordance with the slag formation system; the content of phosphorus of 0.35 to 0.80% in the molten ion can be quickly removed within the normal smelting period, and the final requirement of steel grade can be met; all casting residues in steel making are basically recycled, so that the pressure of residue discharge to the environment and the handling cost can be reduced, and remarkable environment protection benefit is brought. The method brings no change to original requirement, is high in dephosphorization efficiency, and little in influence on the converter melting furnace and the capacity, can expand the steel-making capacity, is high in storage capacity and low in cost, and can be used for expanding the application of phosphorite, and reducing the production cost.

Method for heat application of low-alkalinity casting residue in steel-making

The invention discloses a dephosphorization method of mid-high phosphorus semisteel. The method includes the steps such as reserving slag, sputtering the slag, adding slag material, performing blowing, pouring the slag, adding the slag material again, performing blowing again, turning down a furnace, and allowing tapping. The method has the advantages that the phosphorus content of the high phosphorus semisteel is quickly reduced from 0.25% to 0.80%, to the steel type required range, and rephosphorizing amount in the tapping process of a converter is controlled to be not greater than 0.015%; the method is significant to effective utilization of the high phosphorus iron ores, solving the shortage of ore resources and allowing smooth batch production of high phosphorus motel iron.

Dephosphorization method of mid-high phosphorus semisteel

The invention provides a smelting method for producing manganese-rich slag by smelting and reduction of high-manganese liquid iron in an electric furnace. According to the smelting method, the high-manganese liquid iron smelted and reduced by the electric furnace is placed in a converter and subjected to converting through constant pressure gun changing operation, without adding any slagging materials in the converting process; and oxygen supply converting is carried out for 6-9 minutes at the conditions of oxygen purity more than or equal to 99.5%, pressure of 0.65-0.65 MPa, oxygen supply intensity of 1.7-2.5 m / min. t, so that Mn and Si in the liquid iron are oxidized quickly, the content of manganese in the slag is further increased and then the high-grade manganese-rich slag is formed. The efficient utilization of the manganese resource in the high-manganese liquid iron smelted and reduced by the electric furnace is realized and the manganese-rich slag can be used for producing silicon-manganese alloy, ferromanganese and manganese metal; the production technology is simple, the production cost is lowered greatly and the economic benefit is increased; and the semi-steel chemical components and the temperature after the production of the manganese-rich slag with the method are stable, thus the normal operation requirements of follow-up steel-making work procedures are completely met.

Smelting method for producing manganese-rich slag by smelting and reduction of high-manganese liquid iron in electric furnace

The invention discloses molten forging steel for manufacturing crane wheels and a smelting method thereof. The molten forging steel for manufacturing the crane wheels has the following chemical components in percentage by weight: 0.32-0.38 wt% of C, 1.10-1.30 wt% of Si, 1.10-1.25 wt% of Mn, 0.20-0.30 wt% of Cr, 0.015-0.030 wt% of Ti, S not more than 0.004 wt%, P not more than 0.012 wt%, O not more than 0.0010 wt%, H not more than 0.00015 wt%, and the balance of Fe and inevitable impurities. The preparation method comprises such process steps as KR method molten iron pretreatment deep desulfurization, converter smelting, LF steel ladle furnace refining and VD furnace vacuum refining. The molten steel, provided by the invention, is high in cleanness and low in inclusion content; and the forging steel for manufacturing the crane wheels is high in strength and toughness and excellent in wear and corrosion resistance, prominently improves the impact toughness and the fatigue resistance of the crane wheels in the use process, and prolongs the service life of the crane wheels.

Molten forging steel for manufacturing crane wheels and smelting method thereof

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