47results about How to "Improve performance pass rate" patented technology

The invention discloses a process for producing thin gauge pipeline steel by using a double-stand medium and heavy plate mill. A plate blank with the thickness of 180 mm is used for producing the thin gauge pipeline steel with the thickness less than 10 mm. On the basis that the performance of a rolled piece meets requirements, the thin gauge pipeline steel with a good plate shape can be obtained by controlling the tapping temperature of the plate blank, the rough rolling broadening pass pressing rate, the longitudinal rolling pass pressing rate after rough rolling broadening pass, the rough rolling finishing temperature, the thickness of a middle blank, the finish rolling ending pass pressing rate, the finish rolling finishing temperature, the roller gap inclination and sled function in the rolling process, a high pressure water descaling system, the water entry temperature, the re-reddening temperature, and the head and tail shielding and straightening process of a laminar cooling system. The deformation rate is reduced, and the economic benefit is increased.

The invention discloses a method for adjusting the secondary cooling water amount and the roll gap value of a double-flow slab casting machine. In the double-flow slab casting machine, 12 cooling regions are formed for secondary cooling; 10 cooling water meters are provided; five grades, i.e., strong cooling: the secondary cooling water amount is 1.0-1.1 L/kg, medium cooling: the secondary cooling water amount is 0.8-0.9 L/kg, weak cooling: the secondary cooling water amount is 0.7-0.8 L/kg, medium-weak cooling: the secondary cooling water amount is 0.45-0.6 L/kg, and slight cooling: the secondary cooling water amount is 0.4-0.45 L/kg are divided to adapt to the cooling requirements of different types of steel respectively; the roll gap of a secondary cooling region support roll is consistent with the linear shrinkage rule of a casting blank from top to bottom, and decrease continually; and the roll opening between the outlet of a previous fan-shaped section and the inlet of a next fan-shaped section is kept consistent. By adopting the method, the internal cracking rate is lowered, the macrostructure of the casting blank is optimized, and the performance yield of steel is increased.

The invention discloses a process for improving rare-earth high-strength steel impact toughness. The process comprises the following steps of KR desulfurization slagging off, converter smelting, LF refining, RH refining and rare-earth treating, continuous casting, heating, rolling, accelerated cooling and heat treating. According to the process, aiming at the influence on the microstructure of low-alloy high-strength steel in the case that rare-earth exists, a research shows that rare-earth cerium Ce can improve the forms of inclusions and purify grain boundaries, so that the strength of the grain boundaries is improved, the possibility that cracks extend due to the through defects is reduced, and the impact toughness is improved; and addition, the impact toughness can be improved throughrefining austenite grain boundaries, and meanwhile, adding the rare-earth cerium Ce can enable the ductile-brittle transition temperature of the steel to reduce by about 10 DEG C.

The invention discloses a production method of a 5052-H34 aluminum alloy plate strip. The production method mainly comprises the following steps of: fusion casting, saw cutting, plane milling, heating, hot rolling, cold rolling, finished-product annealing and finishing; in the hot rolling step, the hot rolled coil thickness is reserved by 40-60 percent according to the thickness of a finished product, the finish rolling temperature during hot rough rolling is 430-450 DEG C, and the finish rolling temperature during hot finish rolling is 320-350 DEG C; and in the cold rolling step, the finished-product thickness is achieved through 1-pass or 2-pass of cold rolling, and the total working rate is 40-60 percent. According to the invention, with regard to the 5052-H34 product with the finished-product thickness of being more than or equal to 0.8mm, the working procedures of carrying out full annealing and intermediate annealing on a hot-rolled blank can be saved, the production flow can be shortened and the product cost is reduced.

The invention discloses a control process for performances of a steel plate during hot rolling and flat rolling process of a single-stand steckel mill, which is characterized in that the steel burning temperature at two ends of a heating furnace is 15-40 DEG C higher than that in the middle, the tail temperature of the billet is 10-25 DEG C higher than that at the head; on the procedure without adoption of the steckel mill for scale removal, an air purging system is started and no accumulated water is left on the surface during the rolling process; after a pyrometer detects that the temperature difference of a rolled piece is larger than 50 DEG C, the mill increases the steel throwing speed by an acceleration smaller than 0.02m/s<2>; after a pyrometer detects that the temperature difference of a rolled piece is larger than 30 DEG C, a laminar flow system automatically closes the last one to three groups of cooling water, so as to improve the temperature rise at the tail of the rolled piece and reduce the temperature rise difference of the rolled piece; and for a wide steel plate, a cooling system adopts edge shielding so as to remove temperature difference between the upper edge and the middle along the width direction. By adopting the process in the invention, the performance uniformity of the steel plate flatly rolled by the single-stand steckel mill can be ensured.

The invention discloses a method for a medium plate of controlled rolling at two stages in a non-recrystallization region. The method is to perform two-stage rolling in a temperature range of the non-recrystallization region so as to improve the initial rolling temperature of rolling in the non-recrystallization region, and reduce the soaking time of an intermediate billet at high-temperature stage. The method comprises the following steps: the intermediate billet is immediately subject to first high pressure water descaling operation, when the intermediate billet is cooled to the temperature of the non-recrystallization temperature region, and then is subject to the first-stage rolling in the non-recrystallization region; the intermediate billet is subject to swing holding on the front or rear roller bed of a rolling mill; and the intermediate billet is subject to second high pressure water descaling operation after the billet is held to the set temperature, and then is subject to second-stage rolling in the non-recrystallization region to obtain the medium plate in accordance with the requirement. The method has few rolling passes and large total deformation of rolling in the non-recrystallization region, improves the output per hour, can stabilize the low-temperature impact performance of the steel plate, and improves the performance qualification rate.

The invention discloses a method for effectively controlling generation of central cracks in a medium-carbon steel plate. Molten iron pretreatment, converter tapping pure aluminum block deoxidation, LF (ladle furnace) white slag refinement, RH vacuum treatment and other techniques are mainly utilized to control the molten steel purity and the continuous casting frequency, so that the tundish molten steel superheating temperature is controlled at 5-20 DEG C, the casting blank stacking slow cooling time is controlled to at least 45 hours, and the cooling speed of the rolled steel plate is controlled by an ultra-fast cooling system and a head/tail masking technique, thereby effectively controlling the generation of central cracks in the steel plate. The method improves the internal quality of the steel plate, enhances the performance qualification rate and the flaw detection qualification rate of flaw detection steel, and has favorable economical and social benefits.

The invention discloses an anti-seismic fire-resistant steel plate with the thickness being 100mm and the yield strength being the 460MPa grade and a manufacturing method thereof. The anti-seismic fire-resistant steel plate is characterized by comprising, by weight, 0.06-0.12% of C, 0.10-0.50% of Si, 0.90-1.60% of Mn, smaller than 0.015% of P, smaller than 0.01% of S, 0.20%-0.70% of Cr, 0.15-0.22%of Mo, 0.065-0.110% of Nb, 0.015%-0.045% of V, 0.01%-0.04% of Ti, 0.01%-0.04% of Al, smaller than 0.0060% of N and the balance Fe and inevitable impurity elements. The low-molybdenum and high-niobiumcomponent design thought is adopted, the cost of steel is effectively reduced through the low-molybdenum design, and the high-temperature performance is improved through precipitation strengthening of niobium at the high temperature; meanwhile, a certain number of bainite structures are generated by the steel through the means of controlled rolling and controlled cooling, and the high-temperaturestrength of the steel is regulated and controlled through the good high-temperature performance of bainite; and the rolling mode is hot rolling, the production cost is reduced, and great applicationprospects and economic benefits are achieved.

The invention discloses a magnetic ring production technology. The magnetic ring production technology sequentially includes the following steps that (a) raw materials of magnetic rings are proportioned well according to components, and magnetic ring green bodies are made; (b) false burning is performed on the magnetic ring green bodies one time, and the temperature range of false burning is 750-900 DEG C; (c) the magnetic ring green bodies which undergo false burning are placed into grinding clamps and then placed on a grinding machine to be polished; (d) at last, final sintering is performed on the magnetic ring green bodies. Compared with a traditional production process, according to the magnetic ring production technology, burrs of the magnetic rings are removed, peak power utilization can be avoided, the production cost is lowered to a certain extend, the electrical performance qualification rate of the magnetic rings is improved, the final sintering time is shortened, original production processes are optimized and improved, the technology is simple, and operation is easy.

The invention discloses a method capable of reducing the thickness of a decarburized layer of hot-rolled heavy rail steel. The method is characterized in that a heavy rail casting blank is manufactured into the heavy rail steel through heating and rolling; the weight percentage of Cr in the heavy rail casting blank is 0.1-0.14%; and in the heating procedure, during rolling-delay heat preservation, the temperature of a heating zone is controlled at 1230 DEG C and below, and the temperature of a soaking zone is controlled at 1250 DEG C and below. By optimizing the alloying components of the heavy rail casting blank and the rolling-delay heat preservation rule, the yield of the decarburized layer can be raised to above 96%, the method has the advantages of simple technology, high operability and significant effect, and the problem that the thickness of the decarburized layer exceeds the standard due to the fact that the rolling-delay time of the heavy rail casting blank is too long can be solved effectively. With the adoption of the method, the production efficiency is improved, the yield of the rolled steel is raised substantially, the heavy rail performance yield is raised, and thus the reduction of the cost is realized.

The invention discloses an extra-thick anti-seismic fire-resistant steel plate with yield strength of 390MPa and a manufacturing method thereof. The steel plate adopts a low-molybdenum and niobium-vanadium-added component design thought, the cost of steel is effectively reduced through the low-molybdenum design, the high-temperature performance is improved through synergistic precipitation strengthening of niobium and vanadium at high temperature, meanwhile, a certain amount of bainite structures are generated by the steel through controlled rolling and controlled cooling means, the high-temperature strength of the steel is regulated and controlled through the good high-temperature performance of bainite, the rolling mode is hot mechanical rolling, the production cost is reduced, compared with existing refractory steel for high-rise buildings, the steel is more economical and practical, meanwhile, the anti-seismic fire-resistant steel plate with the thickness of 100mm has important significance on development of super high-rise and large-span green steel structure buildings, and no related patent and report special for the hot-rolled extra-thick fire-resistant steel exists at present, so that the anti-seismic fire-resistant steel plate has great application prospects and economic benefits.

The invention discloses a hot continuous rolled strip steel coiling dual detection method and belongs to the field of automatic control over the coiling temperature of hot continuous rolled strip steel. The method is characterized in that two temperature detectors are arranged at an outlet of laminar cooling equipment and located between the laminar cooling equipment and a coiling machine, wherein the two temperature detectors meet the following conditions that (1) the distance between the detectors and a rolling center line in the horizontal direction is no larger than 4 meters, (2) the distance between the detectors and the rolling center line in the vertical height direction is no larger than 3 meters, and (3) the two temperature detectors have different detection angles, with the horizontal line as a reference, the detection angle of one temperature detector is 35-45 degrees, the detection angle of the other temperature detector is 35-40 degrees, and two temperature detection values T1 and T2 are input into a first-stage controller simultaneously. The situation that strip steel temperature detection is affected when water exists on the strip steel locally is eliminated, stability of control over strip steel coiling temperature is achieved, the product performance and the qualified rate are improved, and good benefits are gained.

The invention relates to anti-seismic steel with an ultralow yield point. Ti is added to fix C atoms so as to reduce the hindering effect of the C atoms on dislocation movement; the anti-seismic steel contains the following chemical components in percentage by weight: less than or equal to 0.0015 percent of C, less than or equal to 0.01 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.03 percent of Ti, less than or equal to 0.01 percent of P, less than or equal to 0.004 percent of S, and the balance of Fe and unavoidable impurities. The anti-seismic steel has the advantages that due to a relaxation process, crystalline grains of ferrite are enlarged, so that the area fraction of the ferrite is increased, and the yield strength is reduced; the performance qualification rate of the anti-seismic steel with the ultralow yield point and the yield strength of 75 to 125 Mpa is greatly improved; according to the statistics, the performance qualification rate within half-a-year production of the type of steel is 85 percent; compared with the conventional method, the production method disclosed by the invention has the advantages that the average qualification rate is increased by 32 percent, and the effect is obvious.

The invention discloses a heating method of a seamless steel tube. The heating method comprises the temperature schedule, the heating time, the pressure schedule and the atmosphere schedule of an annular heating furnace. According to the heating method, a uniform austenite structure can be formed, oxidation burning losses can be reduced, and the defect that the performance indexes such as yield strength and impact strength are low is fully eliminated.

The invention relates to a VCM mobile phone camera module. The camera comprises a lens, a voice coil motor, a base, an optical filter, an image sensor, a flexible circuit board, a bottom plate and a connector; the lens is arranged in the voice coil motor; the voice coil motor is arranged on the base; the optical filter and the image sensor are arranged between the base and the flexible circuit board; the flexible circuit board is embedded in the bottom plate; the flexible circuit board comprises a transverse section and a vertical section, a reserved area is arranged on the front face of the transverse section, six preparation bonding pads different in size are arranged in the reserved area and arranged at intervals along the inner edge of the arc-shaped edge, and a groove is formed in theposition, corresponding to the reserved area, of the back face of the transverse section. The VCM mobile phone camera module has the advantages of being high in positioning precision, capable of improving the assembling efficiency and high in performance percent of pass.