94 results about "Inclusion control" patented technology

An electric arc welder for creating a welding cycle with a real time current waveform constituting several control parameters by a microprocessor that controls a power supply by a signal so the output of the power supply traces a desired waveform and dynamic reaction behavior to arc conditions defined by the control parameters. The welder has a controller for creating the signal and reading the parameters, a graphic user interface program controlled by input from a graphic user interface computer, a system with a first interface for an interactive display for displaying the desired waveform and dynamic behavior and at least one manipulative control parameter, a second interface for a manual data entry device to change the waveform and/or the parameters and a digital communication link from the graphic user interface to the welder microprocessor controller for causing the welder to perform the desired waveform by controlling the signal. A number of script language files each defining a given type of waveform logic and containing a user manipulative variable table of control parameters and graphical descriptive language to display a waveform to be implemented by the welder is used with an input stage for processing a selected one of the script files into graphic user interface components (readouts, charts, and/or panels) for operating the welder.

The invention specifically relates to a control method for inclusions in steel, which belongs to the technical field of iron and steel metallurgy. The invention provides the control method for inclusions in steel to reduce the content of inclusions. The control method comprises the following process flow: A, steel making in a converter; B, slag washing for tapoffs; C, LF refining; D, RH vacuum treatment; E, continuous casting. The key step affecting the control of inclusions is to control components of ladle slag, and the step enables effective control and reduction of the content of inclusions; T[O] of steel can be guaranteed to be no more than 20 ppm with simultaneous cooperation of sectional type calcium treatment. Inclusion grades of steel obtained by the inclusion control method provided in the invention are all low and accord with corresponding standard.

A composition and method is given for a well control fluid that is injected into a well during completion or remediation and prevents fluid flow from a formation into the well during operations (such as shut-in, or placement or adjustment of tools/hardware) when no fluid flow is desired. The composition includes a viscoelastic surfactant fluid system (VES) and a decomposable first solid material, preferably in fiber form, that forms a pack or plug in the well at the location where fluid would otherwise leak off, and then decomposes without intervention to release a product that is a breaker for the surfactant or the micelles of the VES. The composition optionally also contains a pH control agent and a second solid (that may also be a fluid loss agent) that affect the decomposition of the first solid.

The invention provides an inclusion control method of an Si-Mn-killed non-oriented silicon steel, and belongs to the technical field of steel smelting. The non-oriented silicon steel comprises the following chemical components: not greater than 0.005% of C, 0.4-1.0% of Si, 0.20-0.80% of Mn, not greater than 0.04% of P, not greater than 0.005% of S, not greater than 0.005% of Als, and the balance Fe and inevitable impurities. The method comprises the processes of smelting through a converter, refining under RH and vacuum, and continuously casting; the slag amount of the steel from the converteris strictly controlled; lime, synthetic slag and calcium carbide are added to adjust the slag; the refining under HR and vacuum is that a deep decarbonization mode is carried out; after decarbonization, metallic aluminum is added to realize preliminary dexidation, and SiC is added to the ladle slag surface at the same time in order to deoxidize and modify the slag; the operation is circulated for1-3min; then low-carbon low-titanium ferrosilicon is added to realize Low carbon, low titanium ferrosilicon; the operation is circulated for 3-6min, then manganese metal, ferrophosphorus and the likeare added to alloy, and the net circulating time is beyond 8min after alloying. With the adoption of the method, the composition of nonmetal inclusions in the steel can be improved, so that the performances of the non-oriented silicon steel can be improved, and the foundation is supplied to develop high-performance non-oriented silicon steels.

The invention relates to the technical field of metallurgy, in particular to an inclusion control method for rod and wire alloy steel, which solves the problem of inclusion standard exceeding of the rod and wire material alloy steel, improves the molten steel cleanness and improving the molten steel casting performance. The method has the technical scheme that a production process of converter smelting, laser fusion (LF) refining, relative humidity (RH) refining and square blank continuous casting is adopted, the molten steel is subject to the calcium treatment after the LF refining completion during the production, and the RH treatment is then carried out after the soft blowing. The concrete steps are as follows: (1) the molten steel smelted by the converter is deoxidized by aluminum; (2) calcium wires are fed into the molten steel after the LF refining completion; (3) argon soft flowing is carried out on the molten steel after the wire feeding completion; (4) the molten steel is subject to RH vacuum treatment; (5) argon soft flowing is carried out on the molten steel after the RH vacuum treatment completion; and (6) tundish covering agents are added, and the continuous cast steel long nozzle argon blowing protection casting is adopted. The inclusion control method has the advantages that the production cost is greatly saved, and in addition, the inclusion grade is obviously reduced through being compared with that of the original process.

The invention discloses a steel 420MPa grade low yield ratio marine atmospheric corrosion resistant bridge and a production method thereof, the steel comprises the following chemical components in percentage by mass: 0.04-0.20% of C, 0.15-0.45% of Si, 0.85-1.80% of Mn, 0.015-0.050% of Alt, 2.50-4.75% of Ni, 0.20-0.60% of Cu, 0.020-0.080% of Nb, 0.015 to 0.036 percent of Ti, 0.0020 to 0.0050 percent of Ca, less than or equal to 0.020%of P, less than or equal to 0.002%of S, less than or equal to 0.004%of N and the balance of Fe and other inevitable impurities; after the steel of passes the composition design, the inclusion control, the controlled rolling , the controlled cooling and heat treatment, the steel has the advantages of high strength, low yield strength, and can be used for manufacturing various bridges under the ocean atmospheric environment, and the safety of use is greatly improved.

The invention provides an inclusion control method for SWRH82B steel produced by a carbon-free steel ladle. The inclusion control method for the SWRH82B steel produced by the carbon-free steel ladle comprises the following steps that step A, slag system target components of refining top slag are determined and the slag system target components comprise, by mass, 35%-45% of CaO, 6%-8% of AL2O3, 35%-45% of SiO2, 4%-9% of MgO and less than or equal to 1.6% of TFe + MnO; step B, the vacuum degree of RH vacuum refining is controlled at 300 Pa; step C, steel ladle bottom argon blowing time after acid slag is produced is controlled to be greater than 20 min; and step D, the sedation time from the end of refining treatment to the beginning of pouring is greater than 20 min, and binary basicity ofthe refining top slag is further controlled at 0.8-1.2. According to the inclusion control method for the SWRH82B steel produced by the carbon-free steel ladle, the cleanliness of the steel is improved, transformable inclusions with a low melting point are obtained, the problem that AL2O3 and other brittle inclusions increase due to the fact that the SWRH82B steel is produced by the carbon-free steel ladle is solved, and economic benefits are increased.

The invention provides an ultralow-aluminum non-oriented silicon steel inclusion control method. Chemical components of the steel type comprise, by mass percent, not larger than 0.005% of C, 0.25%-1.50% of Si, 0.15%-0.55% of Mn, 0.02%-0.06% of P, not larger than 0.005% of S, not larger than 0.005% of Als and the balance Fe and inevitable impurities. The technological process comprises the steps of KR, BOF, RH and continuous casting. The slag amount is strictly controlled during converter tapping, and lime and a slag surface deoxidizer are added to adjust slag after tapping is finished; and after RH decarburization is finished, low-carbon and low-sulfur ferrosilicon, metal aluminum or an aluminum-calcium-iron alloy are firstly added for complex deoxidation, finally metal manganese and ferrophosphorus are added for alloying, then clean circulation is carried out for 6-10 min, and vacuum breaking and tapping are carried out to continuous casting pouring. Obtained molten steel mainly contains SiO2-Al2O3 series inclusions, so that the situation that low-melting-point SiO2-MnO series inclusions are generated, rolling extension and lengthening are caused, and grain growth is affected is avoided; and meanwhile, refractory material corrosion caused by generation of acidic inclusions of high SiO2 components is also avoided. The types of non-metallic inclusions in steel can be remarkably improved, the performance of non-oriented silicon steel is improved, and the pouring performance of the molten steel is improved.

The invention relates to a steelmaking production method of ultra-low silicon peritectic steel, and belongs to the technical field of iron and steel smelting. The production method comprises the working procedures of molten iron desulphurization, converter smelting, RH treatment and slab continuous casting; in the mass percent of the peritectic steel composition of the finished product, Si content is not more than 0.010%, C content is equal to 0.08-0.10%. In the invention, the production technology procedures of molten iron desulphurization, converter smelting, RH treatment and slab continuous casting are adopted, and high-quality ultra-low silicon peritectic steel of which the Si content is not more than 0.010% is produced; the technical problems that the Si content is easy to be out of limits, the inclusion control capability is insufficient, and the continuous casting slab quality is poor in the existing production technology are solved.

The invention discloses an oxide inclusion control method for producing ultra-low-carbon steel by using an LD-RH process. The method comprises the following steps that 2.0-3.5 kg of lime is added intoper ton of steel at the early stage of steel tapping of an LD converter, and 0.3-2 kg of Al modifiers are added into per ton of steel at the end of steel tapping; then the mixture enters an RH furnace to be subjected to vacuum treatment and decarbonization; after decarbonization is finished, deoxidizing is carried out, and 0.3-2.0 kg of refining agents are added int per ton of steel, wherein therefining agent comprises the following components of, by weight, 50-60wt% of CaO, 30-40wt% of Al2O3, 2-6wt% of MgO, less than or equal to 3wt% of SiO2, less than 0.08wt% of TiO2, less than or equal to1wt% of FeO and less than or equal to 0.5wt% of H2O; and alloying is carried out, wherein molten steel is circulated for 3-12 minutes, and then the vacuum refining process is finished. According to the method, the number of oxide inclusions in the casting blank and the oxygen content of a finished product are greatly reduced, the cold rolling blocking rate is reduced, and the quality of the ultra-low carbon steel product is remarkably improved.

The invention discloses pressure vessel steel resistant to acid corrosion at medium temperature of 600 DEG C and a preparation method thereof. The pressure vessel steel comprises 0.05-0.15% of C, 0.20-0.50% of Si, 0.50-1.00% of Mn, 0.008% or less of P, 0.002% or less of S, 0.050% of less of Alt, 0.30-0.80% of Cu, 0.30-1.00% of Ni, 0.80-1.50% of Cr, 0.20-0.50% of Mo, 0.01-0.05% of V, 0.0070% or less of N and the balance Fe and unavoidable impurities. During preparation, the mass percentage of the chemical components is adjusted in a molten iron tank first, aluminum wires are added into an LF furnace and a RH furnace and continuously cast into a casting blank, the casting blank is rolled in two stages including rough rolling and finishing rolling, then subjected to heat treatment of normalization and tempering and finally cooled, and the pressure vessel steel is obtained. Through composition design, inclusion control, rolling and heat treatment, the obtained pressure vessel steel has good toughness, a low yield ratio and good welding performance and can be used for supercritical thermal power, high-efficiency boilers, nuclear power and other industries.

The invention belongs to the field of manufacturing of low alloy steel, and particularly relates to high-toughness low-yield ratio low-temperature steel for an LPG ship storage tank and a manufacturing method thereof. The low-temperature steel comprises the following raw material chemical components by mass percent: 0.08% to 0.23% of C, 0.30% or less of Si, 0.85% to 1.50% of Mn, 0.004% or less ofP, 0.002% or less of S, 0.015% to 0.050% of Alt, 1.00% to 1.30% of Ni and 0.004% or less of N, and further comprises at least one of 0.10% or less of Mo, 0.05% or less of Nb, 0.036% or less of Ti and0.005% or less of Ca, and the balance being Fe and unavoidable impurities. The method for manufacturing the low-temperature steel comprises a steel-making technology, a steel rolling technology and aprocessing and thermal treatment technology. According to the high-toughness low-yield ratio low-temperature steel, through component design, inclusion control, rolling and thermal treatment, a steelplate has excellent low-temperature toughness and good welding performance, the yield ratio is relatively low, the steel plate can be utilized to manufacture the storage tank for an LPG ship, and utilization safety performance is greatly improved.

Acid corrosion resistant quenching and tempering high-strength pressure vessel steel comprises the components of, by weight, 0.05%-0.10% of C, 0.15%-0.50% of Si, 0.50%-1.20% of Mn, 0-0.008% of P, 0-0.002% of S, 0.015%-0.045% of Als, 0.20%-0.80% of Ni, 0.010%-0.030% of Ti, 0.22%-0.50% of Cu, 0.50%-1.50 % of Cr, 0.23%-0.50% of Mo and 0.002%-0.006% of Ca. A production method comprises the steps of molten iron pretreatment and converter smelting, LF furnace external refining, RH vacuum treatment, tapping and continuous casting blank forming, segmented hot rolling, quenching and tempering. According to the acid corrosion resistant quenching and tempering high-strength pressure vessel steel, after composition design, inclusion control, rolling and heat treatment, yield strength is larger than orequal to 450 MPa, tensile strength is larger than or equal to 540 MPa, elongation is larger than or equal to 20%, -40 DEG C KV2 is larger than or equal to 60 J, no hydrogen induced cracking phenomenon is generated, and stress corrosion cracking is not lower than 0.70 sigma s.

The invention provides a central control apparatus, and a facility control system and method. The central control apparatus includes: a controller that performs control over facilities or equipment; and a display unit that displays information processed by the controller on the screen, wherein the central control apparatus further includes a communication unit that communicates with a meteorological office server, and the controller includes: a data collection module that collects predicted environmental data about a target control area through the communication unit; a system setting module that sets information about at least one facility within the target control area; and an energy usage simulation module that models the facility based on based on the facility information and simulates the power consumption of the facility model according to a control scenario, the energy usage simulation module including an energy reduction calculation module for calculating the energy reduction of the facility or target control area based on a simulation result of the power consumption of the facility model according to a combination of at least one control scenario.

The invention discloses a production process for controlling large inclusions in acid-resistant pipeline steel. Through systematic analysis on a pipeline steel inclusion control mechanism adopting a BOF-RH-LF production process, the component design is reasonably performed; the pipeline steel comprises the following components in percentage by weight: 0.02-0.04 percent of C, 0.10-0.30 percent of Si, 1.00-1.30 percent of Mn, less than or equal to 0.013 percent of P, less than or equal to 0.0010 percent of S, 0.030-0.070 percent of Nb, 0.006-0.020 percent of Ti, 0.10-0.30 percent of Ni, 0.10-0.30 percent of Cr, 0.10-0.30 percent of Cu, 0.015-0.050 percent of Al and the balance of Fe. The production process disclosed by the invention has the benefits that the content of sulfurs in molten steel before calcium treatment is ensured to be less than 10 ppm; the quantitative calcium treatment is performed after the end of LF; the purpose of improving the purity of the molten steel is achieved, so that the internal quality of steels is improved, and the economic benefits are improved.

The invention provides normalized high-strength low-yield-ratio pressure vessel steel with the temperature of minus 70 DEG C. The normalized high-strength low-yield-ratio pressure vessel steel with the temperature of minus 70 DEG C comprises, by mass percentage, 0.10-0.20 of C, not larger than 0.10 of Si, 1.00-2.00 of Mn, not larger than 0.010 of P, not larger than 0.002 of S, 0.005-0.050 of Alt,not larger than 0.50 of Cu, not larger than 0.50 of Cr, not larger than 0.50 of Mo, 0.01-0.05 of Nb, 0.02-0.06 of V, 0.50-1.00 of Ni, not larger than 0.004 of N and the balance Fe and unavoidable inclusions, wherein Cu, Cr, and Mo satisfy the condition that, by mass percentage, the sum of [Cu], [Cr] and [Mo] is larger than or equal to 0.40 and smaller than or equal to 0.90. By the adoption of thenormalized high-strength low-yield-ratio pressure vessel steel with the temperature of minus 70 DEG C and a manufacturing method of the normalized high-strength low-yield-ratio pressure vessel steel with the temperature of minus 70 DEG C, through composition design, inclusion control, rolling and heat treatment, the steel is high in strength, high in low-temperature obdurability and low in yield ratio and can be used for manufacturing various low-temperature movable pressure vessels.

The invention relates to a smelting method for high-surface-quality IF steel. According to the provided smelting method of the high-surface-quality IF steel in the scheme, the BOF-LF-RH-CC manufacturing process is adopted, and an LF is used for heating molten steel to solve the problem that a semi-steel heat source is insufficient; and after the molten steel is subjected to BOF treatment and tapping and before RH treatment deoxidation, except the fact that submerged arc is added and necessary slag needed by inclusion adsorption is added in the LF treatment heating process, addition of the slagis reduced, so that the situations that oxygen in the molten steel is transferred into the slag in the process, the oxygen in the slag is transferred into steel again in the molten steel carrying andcontinuous casting process after decarburization and deoxidation of the molten steel are completed, then secondary oxidation of the molten steel is caused, and the molten steel is polluted by generated endogenous inclusions are avoided. By adopting the smelting method, the inclusion control level can be improved, and the production cost can be reduced.

The invention relates to steel with the tensile strength being of the 680MPa grade and used for a large transportable pressure vessel. The steel comprises the components including, by weight, 0.10-0.20% of C, 0.10-0.50% of Si, 1.00-2.00% of Mn, not greater than 0.008% of P, not greater than 0.002% of S, 0.005-0.050% of Alt, 0.10-0.50% of Cu, 0.01-0.05% of Nb, 0.10-0.20% of V, 0.20-1.00% of Ni, 0.002-0.008% of Ca and 0.010-0.020% of N. A production method comprises the steps that molten iron pretreatment and converter smelting are performed conventionally; LF furnace external refining and RH vacuum treatment are performed in sequence; tapping and continuous casting cogging are performed; segmental hot rolling is performed; normalizing is performed; and tempering is performed. According to the steel which is subjected to component designing, inclusion control, rolling and heat treatment, the tensile strength is 680-830 MPa, KV2 under the minus 40 DEG C condition is greater than or equalto 47 J, the yield ratio ReL/Rm is smaller than or equal to 0.83, and the thickness of a steel plate is 8-30 mm; and by means of the steel, requirements of preparation of the transportable vessel withhigher performance requirements can be met, and furthermore, the self weight can be reduced by 15%.

The invention discloses a defect control method in solidification of a molten aluminum alloy. The defect control method consists of a melting process control method and a solidification insulation control method, wherein the melting process control method includes a molten aluminum gas content control method and a slag inclusion control method; and the solidification insulation control method includes a riser feeding method, a sequential solidification method and a crack control method. The defect control method comprehensively uses gas and slag removal, riser feeding, sequential solidification and aging treatment methods, can effectively reduce the solidification defect probability in cast aluminum alloy, improves the mechanical performances of the cast aluminum alloy, and widens the application range of the cast aluminum alloy.