250 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 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 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.

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 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.

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.