69results about How to "The smelting process is stable" patented technology

The invention discloses a high-strength and high-tenacity gas shielded welding wire. The welding wire comprises the following chemical composition in percentage by mass: 0.02 to 0.12 percent of carbon (C), 1.20 to 2.10 percent of manganese (Mn), 0.20 to 1.00 percent of silicon (Si), less than or equal to 0.010 percent of sulfur (S), less than or equal to 0.015 percent of phosphorus (P), 2.00 to 3.50 percent of nickel (Ni), 0.20 to 0.80 percent of molybdenum (Mo), 0.20 to 0.30 percent of titanium (Ti), 0.60 to 1.20 percent of chromium (Cr), less than or equal to 0.05 percent of vanadium (V), 0.005 to 0.010 percent of boron (B), less than or equal to 0.015 percent of aluminum (Al), less than or equal to 0.35 percent of copper (Cu) and the balance of iron (Fe). The welding wire is used for welding steels of a strength grade of between 850 and 950MPa; and under the protection of a mixed gas (80 percent of argon (Ar) and 20 percent of carbon dioxide (CO2)), the weld metal tensile strength of the welding wire is more than or equal to 850MPa, the yield strength is more than or equal to 720MPa, the elongation is more than or equal to 22 percent, and the low-temperature impact toughness Akv is more than or equal to 181J at the temperature of -30 DEG C, or more than or equal to 175J at the temperature of -40 DEG C, or more than or equal to 162J at the temperature of -50 DEG C.

The invention relates to welding using aluminum alloy welding wire that includes Mg 4.0-6.0wt%, Mn 0.03-0.20wt%, Cr 0.05-0.10wt%, Si less than or equal to 0.25wt%, Fe is less than or equal to 0.40wt%, Cu is less than or equal to 0.20wt%, Zn is less than or equal to 0.20wt%, Be is less than or equal to 0.0003wt%, Ti 0.10-0.15wt%, and the rest is Al and other impurities. The advantages of the invention are stable technology, good extending capacity of welding wire, good welding technology, high intension, and good corrosion resistance.

The invention discloses a method for smelting high-titanium liquid iron by utilizing a converter. The method is mainly used for smelting the high-titanium liquid iron with the titanium mass percentage of 0.3 to 0.5 percent by utilizing the converter. By adopting a double-slag process, the binary basicity of the furnace slag on the preliminary smelting stage of the converter is 0.8 to 1.2, the mass fraction of TFe is 15 to 25 percent, the temperature of a smelting pool is 1370 to 1420 DEG C, and the slagging quantity can reach 50 to 60 percent, so that the problem that the melting point of the furnace slag is increased because the titanium in the liquid iron is oxidized and enters the furnace slag can be maximally reduced; the decarbonization is carried out according to the conventional converter smelting process. By adopting the production process, the melting point of the furnace slag on the preliminary smelting stage can be lowered, the mobility of the furnace slag is good, the overall phosphorus removal rate can reach more than 85 percent, and the splashing can be avoided.

The invention relates to an aluminium-vanadium-tin-copper-iron intermediate alloy and a preparation method thereof, and relates to an aluminium-vanadium-tin (aluminium-vanadium-tin-based) intermediate alloy for the preparation of the titanium alloy and a preparation method thereof. The intermediate alloy is characterized in that the alloy comprises the following components by weight percent: 36.0%-42.0% of V, 11.0%-15.0% of Sn, 4.0%-6.0% of Fe, 4.0%-6.0% of Cu and the balance Al. The preparation process adopts the metallothermics. The aluminium-vanadium-tin-copper-iron alloy is a metal compound using vanadium, tin, copper, iron and the like as main components and has the characteristics of high brittleness and easiness in breakage, thus the production process of the titanium alloy can be shortened and the operations of the production process of the titanium alloy are easier. The aluminium-vanadium-tin-copper-iron alloy uses oxides as raw materials and has low cost, the smelting process is stable, the formed state of the alloy is good; and alloying is uniform, the alloy is added in spongy titanium and aluminium shot in an intermediate alloy manner, and the degree of the segregationof the titanium alloy is reduced.

The invention relates to the technical field of converter steelmaking, in particular to a full-quantity molten iron converter smelting control method. The method specifically comprises the following steps of carrying out deslagging operation, carrying out calculation of the total amount of ore and the total amount of molten iron, carrying out iron converting control, carrying out oxygen supply control, carrying out slagging control, carrying out temperature control and carrying out end point control. According to the control method, splashing in the whole-iron smelting process is avoided, thenvarious defects such as environmental pollution and metal material loss caused by splashing can be avoided, and the smooth smelting process is realized; and the end point carbon temperature hit rateof whole-iron smelting is improved, various hazards caused by end point high-temperature overoxidation are avoided, the quality is ensured, and the important significance in an iron and steel plant isachieved.

The invention relates to a kind of high strength, high tenacity, high withering, and air protecting welding thread. It can avoid mismatching of present welding material, especially poor quality of prevent gas erode. The technique is flowing: first the chemical component is : C:0.04~0.12; Si:0.40~0.80; Mn:1.40~2.0;P<=0.020;S0.015;Ni:0.40~1.0;Cr:0.20~0.50;Ti:0.06~0.20;Cu:0.30~0.50;B:0.002~0.0079;Als<=0.02; a little Fe and other unavoidable impurities. The welding thread is protected by mix gas that is made of percent 80 Ar and percent 20 CO2. The thread head is better in gas eroding proof and mechanism. The tensile strength of the welding slot is as high as 735MPa. And AKv(-0.4 DEG C) of it is 182 J, AKv(-0.6 DEG C) of it is 173 DEG C. The thread is suited to gas protecting welding for important part of railroad, bridge, pipe and so on.

The invention provides an outside-furnace welding device and method for auxiliary electrodes of a vacuum arc furnace. The outside-furnace welding device and method are used for welding between the auxiliary electrodes of the vacuum arc furnace and consumable electrodes. A consumable electrode positioning device comprises a first center frame regulation device, a second center frame regulation device and a third center frame regulation device, wherein the first center frame regulation device, the second center frame regulation device and the third center frame regulation device are arranged in a manner of spacing a certain interval and are of the same structure. An auxiliary electrode positioning device comprises a fixed shear type regulation device, a movable shear type regulation device, a guide rail, a sighting device positioning mechanism and a scale mechanism. An electrode lifting and rotating drive device comprises a first lifting type rotation device, a second lifting type rotation device and a third lifting type rotation device. The second lifting type rotation device actively rotates (is provided with a drive mechanism), and the first lifting type rotation device and the third lifting type rotation device passively rotate (are not provided with drive mechanisms except a drive roller). By means of the outside-furnace welding device and method, the cylindrical auxiliary electrodes of different specifications and cylindrical consumable electrodes of different specifications can be welded outside the vacuum arc furnace according to a certain coaxiality requirement so that the original manner for conducting welding inside the vacuum arc furnace can be replaced.

The invention provides a gas protection welding wire for high-strength weathering steel and steel for the gas protection welding wire. The steel for the gas protection welding wire comprises 0.015-0.08% of C, 0.70-1.50% of Mn, 0.20-0.80% of Si, 0.50-1.30% of Ni, 0.1-0.4% of Cu, 0.03-0.10% of Nb, 0.20% or less of Cr, 0.015% or less of S and 0.020% or less of P. The welding wire comprises 0.015-0.08% of C, 0.70-1.50% of Mn, 0.20-0.80% of Si, 0.50-1.30% of Ni, 0.15-0.50% of Cu, 0.03-0.10% of Nb, 0.20% or less of Cr, 0.015% or less of S and 0.020% or less of P. A copper plating layer is arranged on the surface of the welding wire, and the content of Cu accounts for 0.05-0.25% of the total weight of the welding wire. The welding wire is used for welding of steel of 600 MPa; when 80% Ar and 20% CO2 protection is adopted, deposited metal ReL is larger than or equal to 500 MPa, Rm is larger than or equal to 600 MPa, A is larger than or equal to 25%, and AKv at the temperature below -40 DEG C is larger than or equal to 40 J. The welding wire has the excellent welding technological performance, and is stable in welding arc, small in splashing, free of air hole, attractive in appearance and applicable to all-position welding.

The invention belongs to the technical field of steelmaking, and discloses a method of smelting low-phosphorus steel. The method comprises the following steps of a reladling station molten iron silicon proportioning control step, a waste steel selection and waste steel ratio control step, a converter loading amount control step, a converter blowing gun position, an oxygen supply strength and a bottom blowing flow comprehensive control step; a carbon content and a temperature control step in a smelting process, a semi-steel slag and final slag R and MgO% control step, an steel tapping slag discharging control step, as well as a steel ladle selecting and slag sticking quantity control step. According to the method of smelting the low-phosphorus steel has the advantages that parameters and procedures are optimized, under the condition that the molten iron and steel scrap are given, a qualified cast blank of a finished product which P is less than or equal to 0.005 percent can be producedfinally.

The invention relates to a high-strength and high-toughness automatic submerged arc welding wire with weathering resistance and mainly aims at overcoming disadvantages of poor atmospheric corrosion resistance, high production cost and the like of the existing submerged arc welding materials. In term of technical measures, the welding wire is made from the following chemical components by weight percent: C: 0.05-0.12, Si: 0.01-0.10, Mn: 1.50-2.1. S: not more than 0.015, P: not more than 0.020, Ni: 0.20-0.60, Cr: 0.20-0.50, Cu: 0.25-0.50, Ti: 0.05-0.16, B: 0.002-0.010, Als: 0.001-0.015, Fe and other unavoidable impurities. The welding wire is matched with a basic sintered flux for welding, a weld joint has excellent atmospheric corrosion resistance and comprehensive mechanical properties, and a deposited metal at a weld seam has tensile strength up to 560MPa and ballistic work up to 107J at -40 DEG C and up to 87J at -50 DEG C.

The present invention relates to a high strength and high toughness cast magnesium alloy and its preparation process. The compositions (wt%) are as follows:: Al3-9,Zn 3.5-9.Mn 0.15-1.0, Sb 0-2, Re 0-2. The various raw materials, covering reagent and mould are preheated first. The temperature of crucible is setup beforehand, and the preheated pure Magnesium is charged in the crucible, and then pure aluminum, Al-Mn interalloy, Mg-Re interalloy and pure zinc are also added in turn under the protection of mixed gas of CO2 + SF6, and finally Sb powder wrapped with Al foil is added. After stirring, slag removing, casting and forming, the product alloy ingot is obtained. The tensile strength sigma b reaches 260-280MPa, yielding strength sigma 0.2 >=140MPa, elongation delta 5 >= 6%, impingement work alpha k >= 14 J and Brinel hardness HB >= 70 after treatment of solid solution and aging(T6).

The invention discloses an automatic control device of a rotation type electric smelting magnesium furnace and an electrode current control method, and belongs to the technical field of electric smelting magnesium furnace process control. The device comprises a PLC (Programmable Logic Controller), an electric vibrator, a converter motor, a converter rotating and positioning limiting switch, a converter frequency changer, an electrode motor, an electrode frequency changer, a D / A conversion module, a weighing sensor, an electrode voltage and current signal collecting module an A / D conversion module and an upper computer monitoring system. The method comprises the steps that the three-phase current and the three-phase voltage flowing through a three-phase electrode of the electric smelting magnesium furnace are collected and converted into standard analog quantity current signals; the standard analog quantity current signals are converted into corresponding digital signals to be output to the PLC; and the current control over the electrode of the rotation type electric smelting magnesium furnace is finished in the PLC. According to the method, the functions of current collecting, controlling and the like of the three-phase electrode of the rotation type electric smelting magnesium furnace can be achieved, the error between the current of the three-phase electrode and the current set value is stabilized within the allowable error range, and electric energy consumption is reduced while the product quality is guaranteed.

The invention relates to a solder which is protected by the gas for soldering high intensity and high toughness steel. The main aim solutes the question that the intensity and the toughness of the welding line of the jointing material which is protected by the gas that the high intensity and the high toughness of the new steel used doesn't match at the present. Its technique measure is that its chemic component weight percent of the solder is C 0.04~0.12,Mn 1.50~2.10,Si 0.50~1.0,Ni 0.9~2.0,Ti 0.09~0.25,B 0.002~0.010,Cu 0.10~0.55,Cr 0.20~0.60,S <=0.015,P <=0.020 and Als <=0.015,and the leavingses are Fe and other inevitable impurity substances. The solder in the present invention adopts the mixed gas (80% Ar + 20% CO2) to protect. The metal resisted drawing intensity of the welding line of the invention reaches to 805MPa and the -30 Deg. C impact power is Akv >= 127J.