56results about How to "Increase the amount of steel" patented technology

A method for manufacturing double metal composite wear-resistant metallurgical rollers includes steps of roller core processing, preheating, surfacing of a composite layer, finish machining and thermal treatment. The roller core processing step includes subjecting steel good in tensile strength, yield strength and impact resistance to forging, pressing and tempering, manufacturing roller core blanks, subjecting the roller core blanks to rough machining to reserve size for a surfaced composite layer. The preheating step includes preheating the roller cores to the optimum surfacing temperature of 380 DEG C +/- 5 DEG C. The surfacing step of the composite layer includes surfacing and filling the reserved surfaced composite layer by flux-cored wires on the surface of the preheated roller cores by means of submerged-arc welding process. The finish machining step includes processing the surfaced double metal composite wear-resistant metallurgical roller blanks into design size. The thermal treatment step includes quenching and tempering the double metal composite wear-resistant metallurgical rollers subjected to finish machining, so that the surfaces of the double metal composite wear-resistant metallurgical rollers can meet the requirements for good anti-sticking abrasion, grain abrading resistance, red hardness, resistance to cold and hot fatigue, and peeling resistance.

The invention discloses a two-roller reversible mill roller device and technology using continuous casting round billets for carrying out rolling production. Four types of hole patterns including a transition hole pattern, a supporting hole pattern, a before-finished-product hole pattern and a finished product hole pattern are designed on a pair of rollers. The rolling technology comprises the steps of using the transition hole pattern (1) for rolling the continuous casting round billets, and turning over steel after rolling is accomplished, wherein the rolling reduction ranges from 40 mm to 90 mm per pass; using the supporting hole pattern for continuously rolling the drum-shaped rolled pieces obtained in the previous step to obtain rectangular or square rolled pieces which have regular shapes, and turning over the steel after rolling is accomplished, wherein the rolling reduction ranges from 40 mm 90 mm per pass; using the before-finished-product hole pattern (3) for rolling the rolled pieces to obtain rectangular or oval rolled pieces with reserved rolling reduction and reserved broadening quantity, and turning over the steel billets after rolling is accomplished, wherein the rolling reduction ranges from 20 mm to 90 mm per pass; using the finished product hole pattern for rolling one pass to obtain rolled pieces which are high in dimensional accuracy and product quality, wherein the rolling reduction of square or rectangular steel finished products ranges from 40 mm to 60 mm per pass, and the nominal rolling reduction of round steel ranges from 10 mm to 40 mm per pass.

The invention provides a tank type single-nozzle refining furnace and a vacuum refining method. The tank type single-nozzle refining furnace comprises a vacuum tank and a single-nozzle dipping pipe, wherein the vacuum tank consists of a vacuum tank body and a vacuum tank cover; a vacuum air extracting pipeline is arranged on the vacuum tank body; a steel ladle containing molten steel to be treatedcan be placed in the vacuum tank; one end of the single-nozzle dipping pipe is integrated with the vacuum tank cover; after the steel ladle is hung in the vacuum tank, the lower end of the single-nozzle dipping pipe can extend into the steel ladle when the vacuum tank cover is lowered; and a vent hole for communicating the dipping pipe with the vacuum tank is formed in the upper end of the single-nozzle dipping pipe. In the scheme, the dipping pipe covers above the molten steel or is inserted into the molten steel, so that when slag overflow or molten steel splashing occurs in the dipping pipe, the slag overflow or the molten steel is prevented from being separated from the steel ladle to enter the vacuum tank body, the pollution to the vacuum tank body can be reduced, the steel tapping amount of a primary steel-making furnace can be increased, and the steel yield is further increased; and meanwhile, the argon blowing amount can be increased, the refining effect is enhanced, the refining efficiency is improved, the tank type single-nozzle refining furnace is better linked with the primary steel-making furnace and a subsequent continuous casting process, and the smoothness and continuity of each process are guaranteed.

A hot-rolled section steel roll takes a SGA 1 material as an outer layer and a QT 500-5 material as a core material; after heat treatment, the composition of a god phase structure at the outer layer changes, such as that at the position 0 mm deep from the surface, 30-35% of carbide, 5-7% of graphite and a matrix with lamellar pearlite are converted into 15-18% of carbide, 6-8% of graphite and a matrix with a fine grained pearlite and an acicular structure. The hot-rolled section steel roll is prepared by adopting a centrifugal composite bimetal casting method, so that the wear resistance and the thermal cracking resistance of the product are further improved while the alloy content of the outer layer of the roll is greatly improved. Through actual rolling, the steel passing amount is improved by more than 30 percent, and the phenomena of ring breakage and roll breakage are not generated; and the direct cost of roller consumption is decreased by more than 30 percent for iron and steel enterprises.

The invention provides a novel roller surfacing process. Layered surfacing is carried out on a roller by using welding sticks made of various materials, bottom-layer surfacing facilitates welding fusion with a base body, upper-layer surfacing is a working layer, the wear resistance and impact resistance of the roller can be effectively improved, the service life of a roller hole model is effectively prolonged, hole model processing is facilitated, the single-slot steel passing quantity is improved, the production efficiency is effectively improved, and the surface quality of products is improved.

The invention discloses a method for increasing the tapping quantity of a converter, which comprises the following specific steps: selecting waste steel: determining the specification and size of the waste steel according to the specification and size of an auxiliary material system of the converter; according to the specification and dimension requirements of the scrap steel, the appropriate scrap steel type is determined in combination with the scrap steel resource condition, and the corresponding scrap steel is selected; selecting a stock bin: selecting a certain overhead stock bin of the converter as a special stock bin for scrap steel; waste steel is conveyed, specifically, the waste steel is conveyed to a converter auxiliary material feeding system, and the waste steel is conveyed to an overhead bunker through the converter auxiliary material feeding system; in the normal smelting process of the converter, the waste steel is adopted as a cooling agent and added into the converter through an auxiliary material feeding system to be matched for steel smelting, the method is suitable for steel smelting, the waste steel with the high yield is adopted as a temperature adjusting agent in the smelting process of the converter, and the addition amount of the waste steel is secondarily adjusted according to the heat balance change of the converter; physical heat and chemical heat of molten iron are fully utilized, waste steel is added as much as possible, and the tapping amount of the converter is increased.

The invention relates to a construction method of a prestressed thin plate and a laminated plate with detachable ribs. The prestressed thin plate comprises a prestressed bottom plate, the detachable ribs and connecting assemblies, the detachable ribs comprise upper chords, lower steel bars and web members, and the two lower steel bars and one upper steel bar are fixed through the plurality of web members; the connecting assembly comprises a fixing plate, a fixing piece and a connecting piece, the first end of the connecting piece is anchored in the prestressed bottom plate, and the second end of the fixing piece is exposed out of the prestressed bottom plate and fixed to the fixing plate through the connecting piece; the lower steel bars are placed on the surface of the prestress bottom plate, the fixing plate stretches across the two lower steel bars, and the connecting piece is arranged between the two lower steel bars. The laminated slab comprises the prestressed thin slab and a cast-in-place layer, concrete of the cast-in-place layer is poured on the surface, away from the detachable ribs, of the prestressed bottom plate, the construction method comprises the steps that S1, the prestressed thin plate is produced; S2, the cast-in-place layer is poured; and S3, dismantling is conducted. The prestressed thin plate is large in span, small in thickness, not prone to cracking and high in transportation efficiency.

The invention discloses a casting emulsifier of a continuous casting crystallizer copperplate and a production method thereof. The casting emulsifier of the continuous casting crystallizer copperplate comprises the following components in weight percentage: 86.00-99.00% of C solid, 0.10-5.58% of CaO, 0.23-3.31% of Al2O3 and 0.11-6.68% of MgO. The lubrication effect of molten steel on the crystallizer copperplate in a casting process is realized by adding large quantities of nanographites into a liquid resin; the dispersity of the nanographites is particularly prominent by effect of a proper solvent, such as a liquid resin or a chelating agent; and the casting emulsifier of the continuous casting crystallizer copperplate can be densely and firmly adhered to the prewashed continuous casting crystallizer copperplate by brushing or spraying, and a coating-like protection film is formed on the surface of the copperplate, so that the sufficient lubrication of casting blanks is realized, the friction of the casting blanks on the crystallizer copperplate is reduced, and the copperplate is protected.

The invention discloses a water cooling device. Second installation mechanisms of water passing pipes are located at the same axial positions as pipe bodies and are staggered in the circumferential direction of the pipe bodies, and therefore after the interior bottom surfaces of the pipe bodies are worn out due to steel penetration, the pipe bodies can be overturned around the central axes of the pipe bodies by a certain angle and then fixed to first installation mechanisms of a base through other second installation mechanisms, then the worn parts inside the pipe bodies are overturned to the side surfaces or the top surfaces from the bottom surfaces, the pipe bodies can be continuously used, the amount of steel penetration can be increased for one pipe, the service life of the pipes can be prolonged, and the production cost can be lowered. Furthermore, the multiple water passing pipes are installed on the base in parallel, steel can penetrate into water synchronously, and therefore the yield can be increased.

The invention relates to the technical field of tundish working layer refractory materials, in particular to a low-expansion high-fracture-resistance tundish retaining wall castable. The raw material components comprise, by mass, 13 to 16% of 85 alumina with a particle size of 15 to 8 mm, 13 to 16% of 85 alumina with a particle size of 8 to 5 mm, 6 to 8% of 85 alumina with a particle size of 5 to 3 mm, 6 to 10% of 85 alumina with a particle size of 3 to 1 mm, 5 to 10% of 85 alumina with a particle size of 1 to 0 mm, 6 to 10% of 91 magnesia with a particle size of 5 to 3 mm, 6 to 10% of 91 magnesia with a particle size of 3 to 1 mm, 4 to 9% of 95 magnesia with a particle size of 1 to 0 mm, 3 to 5% of 95 magnesia with a particle size of 200 meshes, 10 to 13% of white corundum dedusting powder and 2 to 5% of chrome corundum waste. The invention relates to a low-expansion-coefficient refractory castable which comprises the following components in percentage by weight: 2% of silica powder, 1-2% of aluminum oxide, 0.2-0.5% of 71 cement, 0.2-0.3% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fibers and 1-1.5% of steel fibers. Compared with the prior art through design, the low-expansion-coefficient refractory castable has the advantages of low expansion coefficient, high breaking strength, moderate cost and molten steel purification function.

The invention discloses a wear-resistant guide disc coil for a seamless steel pipe mill. The wear-resistant guide disc coil comprises the following elements of: by weight, 3.0-3.90% of C, 0.20-0.60% of Si, 0.35-0.85% of Mn, 0.20-0.60% of Mo, 0-0.03% of P, 0-0.03% of S, 0.30-0.75% of Cu, 0.20-0.50% of V, 0.02-0.03% of RE, and the balance being Fe. According to the invention, based on the adoption of a wear-resistant alloy nodular cast iron material, a proper amount of microalloying elements of V and Cu is added so as to refine steel's grain size and improve cast structures. Therefore, high-temperature creep strength and antioxidation capacity of the product are raised, and production requirements of a pipe mill are satisfied. The product provided by the invention is widely applied in various pipe mill guiding equipment.

The invention discloses a blooming down-the-hole pattern design method used on a continuous rolling mill, belongs to the technical field of steel rolling, and aims at the current situation that the utilization rate of an existing roller body is low, and the blooming down-the-hole pattern design method comprises the specific steps that under the condition that the inclination of the side wall of anexisting hole pattern is not changed, the grooving depth of the existing hole pattern is reduced; according to the grooving depth of the down-the-hole patterns and the number of the down-the-hole patterns, the roll collar width of the edge of the roll is obtained; the number of the down-the-hole patterns distributed on the roller needs to meet the requirement that S is larger than or equal to h;and under the condition that the working diameters of the rollers are the same, the diameters of the rollers are determined according to the grooving depth of the down-the-hole pattern. On the premisethat the rolling quality of special steel products is guaranteed, an existing hole pattern is designed into a down-the-hole pattern, the grooving depth of the hole pattern on the roller is reduced byhalf, then the groove bottom of the hole pattern is located at the position with a high hardness layer, the requirement for the steel passing amount of the roller is met, and the use cost of the roller is reduced.

The invention provides a reinforcing method of a cast iron milling roller and belongs to the technical field of metal surface treatment. The reinforcing method comprises the following steps that firstalloy powder is adopted for carrying out first laser cladding on the roller face of the cast iron milling roller, and a first alloy layer is formed on the roller face; and second alloy powder is adopted for carrying out second laser cladding on the first alloy layer, a second alloy layer is formed on the surface of the first alloy layer, and the reinforced cast iron milling roller is obtained. Bythe adoption of the method, by controlling the composition of the first alloy powder and the second alloy powder, the surface quality of the cast iron milling roller can be improved remarkably, the steel passing amount of the milling roller is increased, and the service life is prolonged.