50results about How to "Reduce edge cracking" patented technology

The invention relates to austenite stainless steel and a production method thereof, and belongs to the technical field of stainless steel processing. The stainless steel product mainly comprises the following chemical components in percentage by weight: less than or equal to 0.03 percent of C, 0.4-0.6 percent of Si, 1.0-1.5 percent of Mn, 16.5-18.0 percent of Cr, 10.0-11.0 percent of Ni, 0.010-0.050 percent of N, 2.00-2.50 percent of Mo, less than or equal to 0.040 percent of P, less than or equal to 0.003 percent of S, 20-40ppm of B and the balance of Fe and inevitable impure elements, wherein the DG value is between 6 and 9, the value of Md30 is 30DEG C below zero- 60 DEG C below zero. The production process comprises the following steps: intensively deoxidizing and desulfurizing, adding Fe-B to refine the grain size of an as-cast billet, adding Ca-Si wires into a ladle furnace (LF) and prolonging the time of soft blowing and standing, controlling the superheat degree to be 20-40 DEG C and constant pulling speed of 1.1-1.15m/min; and weakening secondary cooling water, performing hot rolling, cold rolling and thermal treatment, and pickling. By adopting the method, the problem of surface defects occurring in the stainless steel processing process can be alleviated, and the cold rolling yield can be increased.

The invention discloses a duplex stainless steel with pitting corrosion resistance and favourable cold temperature flexibility and a manufacturing method thereof. The duplex stainless steel comprisesthe following components in mass percentage: 0.01-0.10% of C, 0.2-1.0% of Si, more than 0% and less than 1.5% of Mn, 20.0-22.0% of Cr, 1.8-4.0% of Ni, 0.08-0.2% of N, more than 0% and less than 0.5% of Mo, less than or equal to 1.0% of one or more than one of W and Cu and the balance Fe and inevitable impurities. The invention controls Mn content below 1.5% until zero and simultaneously adjusts the content of elements of N, Ni and the like to ensure that steel has high strength, favourable corrosion resistance and favourable impact toughness at room temperature and low temperature when steel contains no or small amount of noble element Mo; meanwhile, the duplex stainless steel has low cost and small hot working difficulty, can be largely applied in the fields of buildings along the coast,petrochemical industry and the like and can replace 304 austenitic stainless steel of which the nickel content is above 8% at room temperature and lower temperature.

The invention relates to a high-yield integrated processing technology of an ultra-fine crystal magnesium alloy thin plate, and belongs to the technical field of plastic working of magnesium alloys. A high-yield processing method comprises the following steps of: firstly, carrying out equal channel angular pressing for a plurality of times; putting a magnesium alloy billet into a preheated die to carry out heat preservation, and then carrying out equal channel angular pressing on the billet for more than eight times, so as to obtain an ultra-fine crystal magnesium alloy block; and secondly, subsequently milling and processing, rolling the ultra-fine crystal magnesium alloy block obtained in the first step for a plurality of times, so as to prepare a magnesium alloy thin plate, wherein the rolling temperature range is 100-350 DEG C. The magnesium alloy micro-structure is refined by equal channel angular pressing to improve the plastic deformation ability, and then processed into the magnesium alloy thin plate and a wide plate by a continuous rolling technology. Therefore, the produced magnesium alloy thin plate is an ultrafine-grained microstructure, even in structure, good in strength and plasticity, and high in yield.

The invention relates to the field of processing of metal laminated plate belts, in particular to a method for rolling a magnesium-aluminum laminated plate by a drum-shaped corrugated roller. The method comprises the following steps of selecting a magnesium alloy plate with the same length and width as a clad plate and a pure aluminum or aluminum alloy plate as a base plate, cleaning the surface of the metal plate, buckling and assembling the ground surfaces of the base plate and the clad plate together, or buckling and stacking and assembling together. In the first pass, when the drum rolleris used for rolling the magnesium-aluminum laminated plate, a stress peak value can be formed on the lowest metal interface of the laminated plate, and the combination of the middle part of the laminated plate and the wave trough of the wave interface is promoted. In the second pass flattening process, a stress peak value is formed on the edge part of the laminated plate with poor bonding and themetal interface at the wave peak part during the first pass rolling of the plate, large plastic deformation is generated at the same time, and the bonding of the edge part of the laminated plate is promoted. According to the process, rolling is carried out twice in sequence, the bonding of the whole interface is promoted, and the bonding strength of the interface of the laminated plate is improved.

The invention discloses a high magnetic induction orientated high-silicon steel plate thin strip and a preparation method thereof. The thin strip comprises the following ingredients: less than or equal to 0.04% of C, 5.0-6.7% of Si, 0.05-0.2% of Mn, 0.015-0.04% of Als, less than or equal to 0.2% of Nb, less than or equal to 0.1% of V, less than or equal to 0.5% of Cu, 0.006-0.010% of N, 0.007-0.02% of S and the balance of Fe and impurities. The method comprises the following steps that: carrying out hot rolling on a plate blank obtained by casting, carrying out acid pickling on a hot rolling plate to remove an oxidization layer, and then, carrying out warm rolling; then, carrying out decarburizing annealing on a cold rolling thin plate; carrying out nitridation processing, and coating thesurface of the steel strip with separant, and carrying out secondary recrystallization annealing and purification annealing; and finally, carrying out flattening stretching annealing. By use of the thin strip, the heating temperature of the plate blank is lowered, inhibitor behaviors and recrystallization tissues are regulated and controlled, so that the harmonious collocation of an inhibition force-tissue-texture in a secondary recrystallization process is realized, the high magnetic induction orientated high-silicon steel plate thin strip with sharp Goss ([110](001)) texture characteristicscan be produced on a large scale, production cost is greatly lowered, and the thin strip has a wide application prospect.

The invention discloses a rolling method for reducing edge cracking of a continuous rolling mill. When a weld joint of a strip steel reaches the preset distance of all the racks of the continuous rolling unit, the lifting amount of a roller gap of each machine frame is controlled and enables the roller gap of the strip steel to enter into each machine frame, so the way of increasing the thicknessof the welding seam and reducing the rolling force of the welding seam area is achieved, edge split and strip breakage accidents caused by ultra-thin strip heads and excessively large rolling force can be avoided, and the smooth rolling is guaranteed. The additional tension value of each machine frame is increased, then the set tension value of each machine frame is obtained, the strip steel is rolled according to the set tension value, so that the tensile stress of the welding seam area is reduced, edge split can be avoided or reduced, so that the phenomenon of strip breakage caused by edge split of the front region and the rear region of the weld joint is avoided, and free rolling of the rolling mill is facilitated.

The invention discloses a temperature-controlled rolling technology of magnesium alloy coiled sheets. The steps comprise: (1) performing heating compensation on a magnesium coiled sheet and uncoiling the magnesium coiled sheet; (2) performing sheet heating compensation and adjusting turning directions of the magnesium alloy sheets; (3) measuring tension of the sheet and controlling a crimp force value; (4) performing integrated temperature control on a part which is to bite into the sheet; (5) performing gradient temperature control on the width direction of the part which is to bite into the sheet; (6) through a temperature-controlled roll, performing finishing rolling on the sheet and the sheet deforming; (7) measuring tension of the sheet and controlling a crimp force; (8) performing sheet heating compensation and adjusting turning directions of the magnesium alloy sheets; (9) performing sheet heating compensation and coiling the sheet in rolls; (10) if the thickness of the magnesium plate coil sheet does not reach the thickness (t0) of a target magnesium plate, reversely repeating the steps (1)-(9) on magnesium coiled sheets on a reversible temperature-controlled rolling mill according to the process steps, performing next temperature-controlled finish rolling processing; (11) if the thickness of the magnesium sheet reaches the thickness (t0) of the target magnesium plate, obtaining the magnesium alloy coiled sheet satisfying the thickness requirements.

The invention provides a hot rolling process for quality carbon structural steel. Procedures of preheating, heating, soaking, rolling, cooling, finishing and inspection are adopted, the temperature ofa heating section is controlled to be 1060 to 1250 DEG C, and the temperature of a soaking section is controlled to be 1040 to 1240 DEG C, so as to prevent the temperature of the heating section andsoaking section from being too low, resulting in increasing the rolling force and making overload of the rolling mill, and to reduce the risk of equipment damage; the temperature of final rolling is controlled to be 900 to 950 DEG C to make the temperature of final rolling close to a phase transformation point, the transformation rate of undercooled austenite to pearlite with ferrite is accelerated such that the Brinell hardness of the quality carbon structural steel is reduced, and the phenomenon that cracks are prone to occur in the subsequent cold shearing process is improved; and billet composition, cooling method, crimping temperature and other methods are controlled to further reduce the occurrence of edge cracks in the production process of carbon structural steel. The hot rolling process for quality carbon structural steel has low control difficulty, strong operability, simple method, no need for high-cost transformation of controlled cooling process, and low cost, and can be applied to the production of various specifications of quality carbon structural steel.

The invention mainly belongs to the field of metal material preparation and machining and particularly relates to a rolling preparation method for a high-silicon electrical steel thin strip. The method comprises the steps of firstly, taking a high-silicon electrical steel casting blank heated in a furnace as the raw material, so that a high-silicon electrical steel plate slab is prepared and obtained, then conducting warm rolling on the high-silicon electrical steel plate slab in a stepwise-cooling mode, so that a high-silicon electrical steel warm-rolled strip is obtained, and conducting low temperature annealing and cold rolling on the high-silicon electrical steel warm-rolled strip, so that the high-silicon electrical steel thin strip is prepared and obtained. According to the rolling preparation method for the high-silicon electrical steel thin strip, warm rolling in a stepwise-cooling mode is adopted, the accumulated maximum warm rolling deflection is not influenced, meanwhile, the rolling temperature can be lowered, and a better toughening and plasticizing effect is obtained; after warm rolling is completed, annealing is conducted in the proper condition, residual tension of sides of the high-silicon electrical steel warm-rolled strip is effectively lowered, meanwhile, restoration of the ordered structure is avoided, and the cold rolling yield is raised.

The invention relates to the field of display, in particular to a sub-pixel rendering method and system based on an RGB triangular sub-pixel layout and a display device. The sub-pixel rendering methodcomprises the following steps: carrying out edge detection on RGB image data to obtain edge information; according to the edge information, carrying out kernel reconstruction on each filter kernel provided with a preset filter coefficient, and obtaining a reconstructed new filter coefficient; and obtaining a sub-pixel rendering RGB video or RGB image. In a DDI (Double Data Interchange) self-adaptive SPR (Surface Plasmon Resonance) method, after various edge types are effectively detected with STH (similar threshold) and DSTH (dissimilar threshold) using a filter directionally reconfigurable according to edge information, filter coefficients are effectively modified with edge information using a simple equation, and edge cracking in sub-pixel rendering is reduced by retaining edges.

The invention belongs to the field of metallurgy technology and material science, and aims to provide a continuous rolling process method for high silicon steel which meets rolling with tension and reeling in the preparation process of a high silicon steel thin strip. The content of alloy Fe is 93%-96.5%, the content of Si is 3.5%-7%, the ratios are all the mass ratio, the initial thickness beforerolling is 0.5-3.5 mm, and the thickness after rolling with tension is 0.1-1 mm. According to the method, a rolled plate subjected to laser welding is connected to a leading belt, auxiliary heating is carried out through a flat furnace and induction heating, then reeling, heating, uncoiling and rolling with tension are carried out, under appropriate rolling process parameters, the high silicon steel thin strip with the thickness ranging from 0.1mm to 1 mm can be obtained through multi-pass rolling with tension. According to the technical scheme, the high silicon steel can be subjected to hotrolling and cold rolling experiments with tension, reeling can be directly carried out, the obtained high silicon steel plate with the tension is excellent in plate shape, less in side crack, relatively small in stress and uniform in thickness, and the method has important significance in high silicon steel pilot-scale application.

The invention relates to a method for producing non-oriented high silicon steel by a cold continuous rolling method. The method comprises the following steps: after RH vacuum decarburization treatment, aluminum deoxidizing and partial aluminum alloying are carried out, and after alloying, net circulation is carried out on molten steel in a large tank for more than 3 times or more than 5 minutes; the standing time from smelting of qualified molten steel to continuous casting starting is longer than 20 minutes; the superheat degree is controlled to be 5-15 DEG C; electromagnetic stirring is adopted, and the proportion of equiaxed crystals is controlled to be 45% or above; 3) the charging temperature of a plate blank in the hot rolling process is higher than 750 DEG C; normalizing is carried out to enable the grain size to be in a range of 90-110 microns; and the temperature of a heating section of a continuous annealing furnace is set to be 950-1150 DEG C, the temperature of a soaking section is set to be 900-1050 DEG C, full-nitrogen dry atmosphere protection is adopted, and the grain size is controlled to be 120-170 microns. The thermo-history parameter control in the whole production process gives full play to the functions of designed microalloy elements, and changes the composition, size, form and distribution of precipitates.

The present invention relates to an advanced-high strength hot-rolled steel sheet, having tensile strength of 980MPa, and a method for manufacturing same, the method enabling enhanced surface quality,processability and weldability as well as significantly reduced deviation of the material in the width and length directions of the steel sheet by means of an endless rolling mode in a continuous casting-direct rolling process. According to a preferable aspect of the present invention, provided are an advanced-high strength hot-rolled steel sheet, having a microstructure, and a method for manufacturing same, the advanced-high strength hot-rolled steel sheet manufactured by means of a continuous casting-direct rolling process and comprising, in weight %, 0.030-0.085% of C, 1.8-3.0% of Mn, 0.03-1.0% of Si, 0.005-0.05% of P, 0.01% or less of S, 0.2-2.0% of Cr, 0.01-0.07% of Al, 0.005-0.10% of Ti, 0.0005-0.0050% of B, 0.001-0.010% of N, the remainder being Fe, and other inevitable impuritiesand, in an area fraction, 40-60% of ferrite, 30-50% of martensite and 10-20% of bainite.

The invention discloses a rolling method for a high silicon steel thin strip. The method comprises the following steps: 1) hot rolling: heating a high silicon steel cast strip which is prepared by a twin roll strip continuous casting process and 2 to 4 mm in thickness as a raw material to 900 to 1100 DEG C under a protection atmosphere, and performing at least one-pass hot rolling till the thickness is 1 to 1.2 mm, wherein the total reduction rate of the hot rolling is 50 to 60 percent; 2) warm rolling: heating the high silicon steel hot cast strip treated in the previous step to 320 to 500 DEG C, and performing at least one-pass hot rolling till the thickness is 0.4 to 0.5 mm, wherein the total reduction rate of the warm rolling is 50 to 70 percent; 3) acid pickling: removing oxide on thesurface of the high silicon steel warm cast strip for cleaning the surface; 4) cold rolling at room temperature: performing multi-pass cold rolling on the high silicon steel warm cast strip subjectedto acid pickling at room temperature with a small reduction rate, wherein the reduction rate of each pass of cold rolling is not larger than 25 percent till the required high silicon steel finished product thickness is reached. By adopting the method, the high silicon steel thin strip has high surface quality, good plate shape and superior annealed magnetic performance.

The invention provides a novel control method of the vibration of a double-roll thin-strip continuous casting casting-roll side sealing plate. Side sealing plate vibration self-adaptive control equipment is composed of side sealing plates, a four-bar linkage, a hydraulic cylinder, a servo valve, a displacement sensor, a proximity switch, a pressure sensor, a programmable controller (PLC), a human-machine interface (HMI) and the like. In a continuous casting process, two casting rolls and two side sealing plates located on the end surfaces of the casting rolls form a molten pool, and molten steel is poured in and condensed into strip steel to be sent out of the molten pool through the rotation of the casting rolls and cooling. Through the reciprocating movement of the side sealing plates, the molten steel on the end surfaces of the casting rolls and the condensed steel strip are beaten, the vibration force generated by the beating can improve the condensing quality of the strip steel, through adaptive control, gaps between the side sealing plates and the end surfaces of the casting rolls are guaranteed, the friction between the side sealing plates and the end surfaces of the castingrolls is reduced, and the service life of the casting rollers and the side sealing plates is prolonged.

The invention provides a high-energy electric pulse strip shape regulation and control method for a high-hardness and high-brittleness cold-rolled strip. The method comprises the following steps of (1), rapidly improving the plasticity, elongation or tensile stress transverse distribution state of the cold-rolled strip difficult to deform by utilizing the electric plastic effect of high-energy electric pulses, finely regulating the electric field state in the cold-rolled strip, reducing the rolling pressure, improving the transverse shape of a roll gap, and finely adjusting the internal residual stress and local deformation; and (2), based on a high-energy electric pulse strip shape control relation, adjusting the strip shape of the cold-rolled strip by utilizing the high-energy electric pulse plasticizing mechanism, meanwhile, adjusting the strip thickness and the surface quality, controlling the thermal convexity of an electric roller in a segmented mode so as to enable the roller gap to meet the fixed proportional convexity relation, reducing the rolling force, keeping good pocket lubricating conditions, and obtaining a good friction peak or friction coefficient meeting the surface quality requirement.