248 results about "% area reduction" patented technology

The invention discloses a hot-rolled wire rod for a 1,960MPa-level cable rope galvanized steel wire and a production method. The hot-rolled wire rod is prepared from, by weight percent, 0.85%-0.91% of C, 0.20%-1.00% of Si, 0.60%-0.90% of Mn, 0.25%-0.35% of Cr, 0.015%-0.040% of Al, not larger than 0.025% of P, not larger than 0.025% of S, 0.02%-0.07% of V, not larger than 0.20% of Cu, not larger than 0.0030% of Ca and the balance Fe and inevitable impurity elements. Reasonable component contents are adopted in the wire rod, the wire rod has the beneficial effects of being high in tensile strength and plasticity, the situation of hardening during machining in the drawing process can be effectively reduced, and the torsional property of the steel wire obtained through drawing is effectively guaranteed. In the wire rod obtained through the method, the sorbite structure proportion reaches 90% to 93%, the tensile strength of the wire rod is larger than or equal to 1,320 MPa, and the area reduction rate is larger than or equal to 40%. After the wire rod obtained through the method is subjected to drawing, galvanizing and stabilizing treatment, the tensile strength of the steel wire is larger than or equal to 1,960 MPa, the torsion index is larger than or equal to 14 times, and the wire rod can be used for producing the 1,960MPa-level bridge cable rope galvanized steel wire and is suitable for ultra-large-span bridges with the ultrahigh requirement for strength.

An apparatus for growing a synthetic diamond comprises a growth chamber, at least one manifold allowing access to the growth chamber, and a plurality of safety clamps positioned on opposite sides of the growth chamber; wherein the growth chamber and the plurality of safety clamps are comprised of a material having a tensile strength of about 120,000-200,000 psi, a yield strength of about 100,000-160,000 psi, an elongation of about 10-20%, an area reduction of about 40-50%, an impact strength of about 30-40 ft-lbs, and a hardness greater than 320 BHN.

The invention provides a micro alloying SWRH87B hot rolled wire rod and a manufacturing method thereof, belonging to the technical field of hot rolled wire rod. In the invention, Cr and V micro alloying are adopted; double slag process high drawing carbon operation is used in a converter; end-point carbon is controlled at 0.40-0.60%, the steel tapping temperature is 1580-1620 DEG C, and the slag-blocked tapping is used; low nitrogen carburant is used for recarburization; Si-Ca-Ba is used for deoxidation; 600-800kg synthetic slag is added into each converter; oxygen activity is controlled below 10ppm by entering into an LF refining station, and the refined finishing slag sum of FeO and MnO is no more than 3%; inclusion modification treatment is carried out on the Ca-Si line; a billet in the size of 160mm*160mm is used, a casting mould is used for coordinating with final electromagnetic stirring (F-EMS); continuous casting machine whole protection, constant drawing speed casting and proper secondary cooling system are adopted; the initial rolling temperature is controlled at 1020-1150 DEG C which is conductive to welding the drawholes and increasing the probability of the drawholes welding; the water pre-cooling and phase transformation strengthening cooling technology is used to control the texture and the performance. The invention has the advantages that the aging time of the wire rod before the follow-up processing is shortened, the tensile strength thereof after aging time is larger than 1280MPa, and the area reduction rate is larger than 25%.

A method includes providing a schedule of engagements for a resource. Each engagement has a working window and an associated engagement density function. The engagement density functions of the scheduled engagements are combined to generate a committed capacity function for the resource. A region of violation in the committed capacity function is identified where the committed capacity of the resource exceeds a capacity threshold. An area of a region of overlap between the working window of a selected one of the engagements and the region of violation is determined. An area reduction amount for the selected engagement is determined based on a portion of the area of the region of overlap. The working window of the selected engagement is changed based on the area reduction amount.

A method is proposed that identifies and quantifies stenoses in arteries based on an analysis of Doppler frequency shifts from several heartbeats. It is non-invasive and individual insensitive. Pulsatile flow through a blood vessel with wall roughness and/or variable lumen area generates flow disturbances, which lead to variations in the shape of the Doppler shift frequency spectrum. One or several frequency bands that are affected by these flow disturbances are selected from the overall Doppler shift frequency spectrum. Next, one or several parameters, which characterize the selected frequency bands and vary with the degree of stenosis, are used in a linear function to calculate the percentage of lumen area reduction. This method applies in the clinically important range of lumen area reduction of 10-70% with a standard error of 5% or less. For lumen area reductions greater than about 70%, the standard error is larger. A system for practical implementation is also proposed.

The invention provides a high-strength high-carbon steel wire rod and a production method thereof. The high-strength high-carbon steel wire rod comprises the following components by weight percentage: 0.85%-0.90% of C, 0.1%-1.0% of Si, 0.3%-1.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.0010% of Ti and the rest Fe. The production method comprises the following steps of: 1), smelting: preprocessing molten iron, controlling sulfur to be less than 0.005%, and feeding less than or equal to 0.040% of Ti into a convertor, wherein the smelting final-point phosphorus content of the convertor is less than or equal to 0.010%, the final-point molten steel temperature of the convertor is at 1,570-1,680 DEG C, the refining process temperature is at 1,530-1,625 DEG C, and the refining time is for 20-50minutes; 2), continuous casting: adopting a large square ingot for the continuous casting, wherein the tundish molten steel superheating temperature is not more than 30 DEG C; and 3), continuous rolling and wire rod rolling, wherein the diameter of the wire rod is 5.5-8.0mm, the laying temperature is 870-910 DEG C, the sorbite transformation process temperature of the wire rod is controlled at 640-600 DEG C, the transformation time is controlled at 7-12seconds, and the sorbite transformation process average supercooling temperature of the wire rod is controlled at 60-80 DEG C. Due to the adoption of the high-strength high-carbon steel wire rod disclosed by the invention, the tensile strength can reach 1,200 MPa-1,300MPa, and the area reduction index is not less than 30%.

The present invention is hot continuous rolling process of high-sulfur (sulfur-phosphorus) easy-to-cut structural steel, and features that the billet is hot rolled into rod or wire by means of controlling billet heating, coarse rolling speed, area reduction and cooling water flow rate. The present invention solves the difficult problem of rolling easy-to-cut structural steel with high high-sulfur (sulfur-phosphorus) content without producing crack, and has high production efficiency, stable quality and high material utilization.

The present invention is intelligent no-mold drawing formation apparatus and process, and belongs to the field of metal pressing work technology. The apparatus includes an intelligent automatic control system, a feeding and drawing system, a heating and temperature measuring system, a cooling system and a protecting gas supplying system. The technological process includes loosening the automatic hold-down device, passing the drawn material through the feeding rolls, heating, applying the automatic hold-down device to hold down the material, and moving the material forwards under the computer control to obtain predicted area reduction. The present invention has raised stability and high product size precision, and is suitable for high efficiency work of producing wires and rods.

The invention discloses a SiC MOSFET device with an integrated schottky diode, wherein an original cell structure of a source region from top to bottom is a drain electrode, a substratum, a buffer layer, a drift layer and two P well regions symmetrically from the left and the right. The adjacent n++ area and P++ area arranged on the P well regions from left to right are sequentially provided with a source electrode, a grid electrode, a schottky metal, the grid electrode and the source electrode. The source electrode is positioned above the n++ area and P++ area. The surface part of the P well regions is fully covered with the grid electrode. One side of the grid electrode overlaps with the n++ area and the other side of the grid electrode overlaps with a JFET area. The schottky metal is positioned above the JFET area. The SiC MOSFET device with the integrated and inverse parallel schottky diode is provided, wherein the integrated schottky diode is located in the JFET area, adjacent to the grid electrode area. The SiC MOSFET device with higher original cell integration and density has the advantage of effectively utilizing the proportion of the JFET area. Meanwhile, compared with conventional MOSFET, the current MOSFET is capable of effectively reducing grid capacitance and input-output capacitance and improving switching performance of the device due to the area reduction of the gate capacitance.

Coexistence of the realization of high-capacity of a capacitive element and the area reduction of a semiconductor device is aimed at. A plurality of capacitive elements from which a kind differs mutually are accumulated and arranged on a semiconductor substrate, and they are connected in parallel. These capacitive elements are arranged to the same plane region, and make a plane size almost the same. A lower capacitive element is an MOS type capacitive element which uses as both electrodes the n-type semiconductor region formed in the semiconductor substrate, and the upper electrode formed via the insulation film on the n-type semiconductor region. The MIM type capacitive element formed with the pattern of the comb-type of a wiring is arranged in the upper part of a lower capacitive element, and this is connected with a lower capacitive element in parallel.

The invention discloses a method for manufacturing the stainless steel wire for a spectacle frame, comprising the following steps: (1) treating the skin film; (2) drying; (3) drawing for the first time and carrying out bright annealing on line for the first time, wherein the area-reduction rate during drawing for the first time is 40-60%, the temperature of carrying out bright annealing on line for the first time is 1,000-1,100 DEG C, and the speed is 3-9m/min; (4) drawing for the second time and carrying out bright annealing on line for the second time, wherein the area-reduction rate during drawing for the second time is 40-60%, the temperature of carrying out bright annealing on line for the second time is 1,000-1,100 DEG C, and the speed is 5-12m/min; and (5) drawing for the third time and carrying out bright annealing on line for the third time, wherein the area-reduction rate during drawing for the third time is 45-75%, the temperature of carrying out bright annealing on line for the third time is 1,000-1,100 DEG C, and the speed is 5-12m/min. The stainless steel wire manufactured by the method has a bright surface, is free from the surface defect, has high tensile strength temperature and good extensibility and has the following mechanical properties: the yield strength of 300-400N/mm<2>, the tensile strength of 550-650N/mm<2> or higher, the elongation of 50-60% and the hardness value (HV) of 200-300.

Power amplifier (PA) systems are typically comprised of a signal path integrated circuit (IC) and a power control IC. Advanced CMOS technologies may allow smart integration of such ICs into a single IC and provide an opportunity to improve performance and cost. Specifically, the radio frequency (RF) signal path is designed to enable local biasing of the gain stages that comprise the RF signal path. By using current-mode biasing instead of the prior art voltage-mode biasing significant area reduction is achieved as well as better isolation between the stages which reduces noise, and improves stability.

Using side-wall conductor leads deposited on the side-walls of a base substrate to form package level conductor leads for active circuits manufactured on silicon substrate(s) stacked on the base substrate, the preferred embodiments of the present invention significantly reduces the areas of surface mount package chips. Besides area reduction, these methods also provide significant cost saving and reduction in parasitic impedance.

An EDA (Electronic Design Automation) process which collects and moves empty-spaces among cells on a circuit layout to one or more target areas for productive use, such as chip-size reduction and routability congestion alleviation. The process includes globally moving the empty-spaces to the target area and thereafter locally moving the empty-spaces as refinement.

The invention discloses a heat-resisting steel material used as a vane or a bolt of a supercritical steam turbine. The chemical composition of the material (in percentage by weight) is: 0.12 to 0.16 percent of C, 0.30 to 0.70 percent of Mn, 0.35 to 0.65 percent of Ni, 10.0 to 11.0 percent of Cr, 0.30 to 0.5 percent of Mo, 1.5 to 1.9 percent of W, 0.14 to 0.20 percent of V, 0.05 to 0.11 percent of Nb, 0.04 to 0.08 percent of N, and the balance of Fe and impurities. The chemical property of the material is that: tensile strength sigma b is more than or equal to 930MPa; yield strength sigma 0.2 is more than or equal to 765MPa; tensile stretch delta is more than or equal to 14 percent; percentage of area reduction psi is more than or equal to 32 percent; ballistic work AKv is more than or equal to 20J; and hardness HB is between 277 and 331.

To realize an area reduction of a semiconductor chip without adding a process, and to provide a semiconductor chip structure having an excellent pressure balance when mounted. In the structure of a semiconductor chip in which control/power supply lines are formed on a glass substrate, connecting terminals for electrically connecting with the control/power supply lines are provided in alignment in the longitudinal direction of the semiconductor device, whereby the wiring length within the semiconductor chip can be suppressed to be minimum. Since the wiring length is shortened, the width of the wirings within the semiconductor chip is narrowed, so that the area of the semiconductor chip is reduced.

The invention relates to a high-strength and ductility durable type large-diameter 1960 MPa stage zinc-aluminum alloy coating steel wire for a bridge cable. A steel wire rod is an ultra-pure hyper-eutectoid steel high-carbon steel wire rod obtained after sorbite treatment (water bath, lead bath and salt bath), the strength of extension is larger than or equal to 1290 MPa, the area reduction rate is larger than or equal to 30%, and the elongation is larger than or equal to 10%; and the steel wire rod is drawn into a bright steel wire with the diameter ranging from 4.90 mm to 6.90 mm, then hot galvanizing zinc-aluminum alloy coating is carried out, and technological processes include lead bath degreasing, hot water washing, chlorohydric acid pickling, hot water washing, weak base washing, hot water washing, ammonium chloride and zinc chloride solvent plating assisting, hot-dip galvanizing-nitrogen smearing, zinc-aluminum alloy hot galvanizing, nitrogen smearing and wire collecting. The steel wire rod is subject to stabilization treatment, and the strength, the linearity, the relaxation rate and the steel wire axial homogeneity of the large-diameter ultrahigh-strength Zn95Al5 alloy coating steel wire are guaranteed.

The invention relates to the technical field of steel and iron materials and in particular relates to an ER70S-6 hot rolled wire rod and a preparation method thereof. In the process steps, deoxidation treatment is performed on the liquid steel by use of a non-calcium alloy material to avoid the increase of the calcium content in the steel, and furthermore, splashing in the process of welding is avoided. The carbon content in the steel is reduced so that the strength of the wire rod can be reduced; the percentage of area reduction and the percentage elongation of the wire rod are increased, in other words, the plasticity of the wire rod is improved, and consequently, the wire rod can be drawn into a welding wire directly without annealing and the production cost of a welding wire factory is reduced; besides, in the preparation process, the quality of the ER70S-6 hot rolled wire rod is improved by controlling the contents of various elements, such as carbon, silicon and magnesium, so that the welding property of the welding wire is improved; in the cooling process of rolling, draught fans on an air cooling line are all turned off and thermal insulation covers are all closed so that the highest tensile strength of the wire rod does not exceed 550MPa and the plasticity of the wire rod is good.

A method of manufacturing steel wire for reinforcement of rubber articles comprises the steps of passing a wire rod plated with brass, through a group of dies immersed in a lubricant containing phosphate in continuous wet processing, winding the resulting steel wire around a spool, mounting the spool on a pay of unit of a twister assembly, and drawing the steel wire by the use of one or more dies arranged between the pay of unit and twisting unit of the twister assembly and having an area reduction per die of at least 5%, to reduce the diameter of the steel wire. Phosphor compound in the coating film formed on the brass plating of the steel wire contains phosphor in the range of 0.2 to 0.9 mg/m2 and zinc oxide in the range of 20.0 to 70.0 mg/m2. Also, provided is a steel cord which comprises twisted steel wires. The initial adhesion of the steel wire or steel cord for reinforcement of rubber articles to rubber is well and economically improved, shortening the curing time and enabling economical production of rubber products.

The invention provides a method for producing a pearlitic rail by subjecting to at least rough hot rolling and finish hot rolling a billet comprising, in mass %, C: 0.65-1.20%, Si: 0.05-2.00%, Mn: 0.05-2.00%, and a remainder of iron an unavoidable impurities, wherein the finish hot rolling is conducted by rolling at a rail head surface temperature in a range of not higher than 900° C. to not lower than Ar₃ transformation point or Ar_cm transformation point to produce a head cumulative reduction of area of not less than 20% and a reaction force ratio of not less than 1.25, and the finish hot rolled rail head surface is subjected to accelerated cooling or spontaneous cooling to at least 550° C. at a cooling rate of 2 to 30° C./sec, thereby refining the rail head structure to attain a hardness within a predetermined range and improving rail wear resistance and ductility.

The invention discloses a low-alloy high-strength cast steel for low temperature, and the cast steel comprises the following components in percentage by weight: 0.10%-0.15% carbon, 0.30%-0.60% of manganese, 0.10%-0.50% of silicon, 0%-0.015% of phosphorus, 0%-0.025% of sulfur, 1.0%-1.4% of nickel, 0.20%-0.35% of chromium, 0.20%-0.35% of molybdenum, 0.03%-0.06% of vanadium, 0%-0.01% of copper, 0%-0.08% of aluminum and the balance of iron. The low-alloy high-strength cast steel is prepared through electric furnace and argon oxygen decarburization duplex smelting and pouring and normalizing and high-temperature tempering treatment. The cast steel disclosed by the invention achieves the tensile strength of 570-590 Mpa, the yield strength of 460-475 MPa, the elongation percentage of 25%-27%, the area reduction percentage of 67%-70%, the carbon equivalent less than or equal to 0.45% and the impact energy of 110J at -40 DEG C, has the advantages of high strength, good toughness, excellent low-temperature toughness and welding property especially, less alloy element addition, simple heat treatment process and lower cost and is especially suitable for manufacturing high-strength steel casting materials which have severe requirements on low-temperature toughness and welding.

The invention discloses a method for manufacturing the free-cutting stainless steel wire for a ball-point pen head, comprising the following steps: (1) treating the skin film; (2) drying; (3) drawing for the first time and carrying out bright annealing on line for the first time, wherein the area-reduction rate during drawing for the first time is 40-60%, the temperature of carrying out bright annealing on line for the first time is 700-900 DEG C, and the annealing speed is 3-9m/min; (4) drawing for the second time and carrying out bright annealing on line for the second time, wherein the area-reduction rate during drawing for the second time is 40-60%, the temperature of carrying out bright annealing on line for the second time is 700-900 DEG C, and the annealing speed is 5-12m/min; and (5) drawing for the third time, wherein the area-reduction rate during drawing for the third time is 25-45%. The free-cutting stainless steel wire manufactured by the method has a bright surface, is free from the defects of black and yellow lines, drawing stamps, cracks, folding lines, peeling and the like and has the following mechanical properties: the yield strength of 500-800N/mm<2>, the tensile strength of 700N/mm<2> or higher, the elongation of 3-6% and the hardness value (HV) of 240-280.