58 results about "Oxygen converter" patented technology

A method for prolonging the campaign life of a combined blown converter by adopting a metal slag syntactic mushroom head belongs to the technique field of oxygen converter steelmaking. A circular seam type bottom blowing air-supplying element is adopted to replace a capillary permeable brick, thus allowing airflow to concentrate and raising the cooling power on the tip of a nozzle. After well-developed metal mushroom head is formed at the initial campaign stage of smelting process, slag splashing process is carried out immediately to form a slag mushroom head on the surface of the metal mushroom head. After the initial formation of the metal slag syntactic mushroom head, attention is paid on detecting whether the air pressure, P-Q curve of the flow relation, and cold state measurement value have obvious discrepancy; if the discrepancy is larger, the technology is appropriately adjusted to ensure the ventilation property. In the following campaign period, the mushroom head is protected; the mushroom head and hearth height are often detected; the deviation between cold state P-Q curve and the hot sate P-Q curve is detected, thus ensuring that the mushroom head can protect the bottom blowing element effectively in the whole campaign period and having good ventilation property. The method has the advantages of allowing the furnace campaign of the combined blown converter to achieve over 10000 and can reach to 30000 for maximum.

The invention relates to high-toughness corrosion-resistant steel. The high-toughness corrosion-resistant steel comprises the following chemical components in percentage by weight: 0.03 to 0.10 percent of C, 0.2 to 0.6 percent of Si, 0.35 to 0.75 percent of Mn, 12 to 14 percent of Cr, 0.5 to 1.5 percent of Ni, 0.01 to 0.04 percent of Al, 0.1 to 0.3 percent of Mo, less than or equal to 0.015 percent of P, less than or equal to 0.006 percent of S and less than or equal to 0.01 percent of N, wherein the Al/N is greater than 2, and the balance is Fe and unavoidable impurities. The manufacturing method of the high-toughness corrosion-resistant steel comprises the following steps of: smelting the chemical components by refining in and out of an electric arc furnace and performing vacuum refining treatment, or refining in and out of an oxygen converter and performing vacuum refining treatment or adopting an electroslag remelting method, and casting into ingots; making hot ingots enter the furnace before forging, wherein the surface temperature of ingots entering the furnace is less than 600 DEG C, the forging heating temperature is 1,200 to 1,250 DEG C, the finish forging temperature is greater than 1,000 DEG C, the forging ratio is greater than 6, and the grain fineness number at 1/2 of the thickness of the wall of a forged piece is not less than level 6. The high-toughness corrosion-resistant steel obtained by the method has the yield strength of greater than 517 MPa, and the ballistic work at -46 DEG C is greater than 27 J; and the high-toughness corrosion-resistant steel is suitable for FF-grade 105 MPa production tree body in oil and gas industry.

Sub-lance carriage fall arrest mechanism relates to an oxygen supply equipment on a top-blown oxygen converter. In order to prevent the sub-lance carriage from falling, the invention provides a sub-lance carriage fall arrest mechanism. The sub-lance carriage fall arrest mechanism comprises cable wires which drive a carriage to move up and down on tracks, is characterized in that the sub-lance carriage fall arrest mechanism also comprises a rotary arm, a connecting bar and a locking pawl, wherein the middle part of the rotary arm is hinged on a carriage frame; one end of the rotary arm is hinged with the end of the cable wire, while the other end of the rotary arm is hinged with the end of the connecting bar; the lower part of the rotary arm, connected with the connecting bar, is provided with a spring which can be compressed by rotated the rotary arm; one end of locking pawl is hinged with the carriage frame, while the other end is hinged with the other end of the connecting bar; the end face of the locking pawl connected with the connecting bar can get into contact with the track through the structure. The sub-lance carriage fall arrest mechanism effectively restrains carriage from falling down when cable wires broken and greatly improves the liability of sub-lance work and carriage work, so the sub-lance carriage fall arrest mechanism is propitious to spread and exploitation.

A method for the regeneration of a metal slag syntactic mushroom head and shimming a hearth with ventilation property belongs to the technique field of oxygen converter steelmaking. In the case that melting loss of hearth is caused by using a converter for smelting mild steel and the melting loss occurs correspondingly at the metal slag syntactic mushroom head, the metal slag syntactic mushroom head is regenerated and the shimming hearth with ventilation property is ensured. In the whole furnace campaign period, the sunken amount is seriously controlled to be less than or equal to 200mm according to the hearth thickness. The operation of hearth shimming comprises the following three stages: hearth cleaning, metal mushroom head regeneration and sintering hearth shimming. The invention provides a technique method for the regeneration of metal slag syntactic mushroom head and shimming the hearth with ventilation property in the case that the hearth is eroded when using a top and bottom combined blowing converter, and the technique method is used for protecting bottom blowing elements and raising the campaign of the top and bottom combined blowing converter. The sintered layer on hearth with good ventilation property is formed and finally the metal slag syntactic mushroom head with good ventilation property is reformed through adjusting the granularity ratio of repairing mass and adopting reasonable sintering technology.