43results about How to "Promotes grain refinement" patented technology

The invention relates to a stainless steel clad plate billet conticaster. It belongs to a continuous casting device in the art of metallurgical industry. The device can be characterized in that: it comprises three synchronous circulating mobile steel band crystallizers A, B and C, which are Y- type equipped, the lower cooling steel band 2 of crystallizer A being common with the right-side cooling steel 2c of the crystallizer C, and the lower cooling steel band 2b of crystallizer B being common with the left-side cooling steel 2d of the crystallizer C. After the strand being forged by from multigroup flexible guiders, multigroup steam- water spray devices and traction roller which are under the crystallizer C, the clad plate billet is aligned to horizontality by a blending guider and a smoothing roll, and then is sent to shearer to be sheared into a definite length or sent to continuous rolling mill to roll down. The merit is characterized in that: it improves the production efficiency of the conticaster, and guarantees the quality of strand and rolled metal.

The invention relates to the field of laser processing, in particular to a method and a device for compositely preparing a surface-layer biomimetic structure by mechanical effects based on laser carving and laser shock, which are particularly suitable for processing a biomimetic surface and a friction pair surface. The method is characterized by comprising the following steps: firstly preparing aregular micro geometrical appearance with certain density (space), width, depth, angle and shape on the surface of a workpiece by the laser carving technology; and then forcedly processing the micro geometrical appearance area by laser shock to process a microstructure which has the required shape and management mode and is optimally matched with the requirement of lubricating property on the surface of the workpiece. The device for the implementation method comprises a control device, a nanosecond laser generator, a laser beam I, a light guide tube I, a totally reflecting mirror I, a light spot adjusting device I, a fiber laser, a laser beam II, a light guide tube II, a totally reflecting mirror II, a light spot adjusting device II, an automatic spraying device, a restrain layer, an absorption layer, the workpiece, a workpiece fixture system and a five-axis working platform.

The invention relates to a high-intensity welding wire for aluminum-zinc-magnesium-scandium alloy. The high-intensity welding wire comprises the following components of, by mass, 1.0% to 5.0% of Zn, 1.0% to 6.0% of Mg, 0.05% to 0.25% of Sc, 0.05% to 0.25% of Zr, 0.1% to 0.4% of Mn, 0.5% to 1.0% of Cu, 0.05% to 0.25% of Ti, 0.01% to 0.15% of the rare earth element Y or 0.01% to 0.15% of the rare earth element Ce, 0.05% to 0.25% of Cr, and the balance Al. According to the high-intensity welding wire, on the base of Al-Zn-Mg, the small amount of Cu is added so that the extension strength of a joint can be effectively improved, and the Sc and the Zr which are the same in content are added so that the heightening effect of aluminum alloy performance by single Sc can be remarkably improved. In addition, the micro-alloy elements of Ce, Ti, Cr and the like are added so that more excellent structural performance and welding process margins can be obtained, the sensitivity of welding cracks of the alloy can be reduced, comprehensive mechanical performance of the joint can be improved, and the high-intensity welding wire has good stress-corrosion resistant performance.

The invention relates to a Zn-Al-Mg alloy layer used for being hot-dipped to a bridge steel wire surface and a manufacturing method for the Zn-Al-Mg alloy layer. The alloy layer comprises, by mass, 30%-97% of Zn, 5%-60% of Al and 0.02%-11% of Mg, wherein the sum of the percentages of all the components is 100%. The manufacturing method includes the steps that a bridge steel wire is unoiled and derusted; the alloy layer is hot-dipped; and stabilizing treatment is conducted. According to the alloy plating layer, the corrosion resistance is superior to that of an existing zinc plating layer and that of an existing zinc aluminum alloy plating layer, the alloy plating layer is easy to use, meets the requirements of the special environments, such as the requirement for bridge steel wires in the marine corrosion atmosphere environment and has wide market prospects.

The invention discloses pipeline steel with excellent toughness for a minus 45 DEG C extremely-low-temperature environment and a manufacturing method thereof. The steel comprises, in percentage by mass, the following chemical elements of 0.030%-0.060% of C, 0.10%-0.30% of Si, 1.30%-1.60% of Mn, less than or equal to 0.0100% of P, less than or equal to 0.0015% of S, 0.40%-0.55% of Ni, 0.05%-0.20% of Cr, 0.050%-0.075% of Nb, 0.008%-0.020% of Ti, 0.0010%-0.0040% of Ca, 0.010%-0.050% of Al, less than or equal to 0.005% of B, 0.0010%-0.0060% of N, less than or equal to 0.0050% of O, and the balanceFe and inevitable impurities, wherein the elements simultaneously meet the following relationship that the Ni is larger than or equal to 1.6*(C+Mn / 6), log (C*Nb) is less than or equal to minus 2.5, Cplus Mn / 6 plus Cr / 5 is larger than or equal to 0.28% and is less than or equal to 0.35%, and Ti / N is larger than or equal to 2.5 and is less than or equal to 5.0. The yield strength of the pipeline steel is larger than or equal to 450 MPa, the tensile strength is larger than or equal to 535 MPa, the elongation rate is larger than or equal to 18%, the Charpy impact power AKV at minus 45 DEG C is larger than or equal to 250J, and the shear area rate Sa% of a DWTT fracture at minus 45 DEG C is larger than or equal to 85%.

The invention discloses a fiber-metal tube necking processing preparation method, which relates to the field of material forming; it includes the steps of: (1) pre-treating an alloy plate and a carbon fiber cloth, stacking and then blanking, rolling and forming after blanking, Seamless welding to form circular pipe fittings; (2) Heating the fiber metal pipe fittings in step (1) and extruding them into the variable-diameter shrinking die, so that the pipes are extruded with each other under the action of the variable-diameter shrinking die to produce plastic deformation and fit tightly to obtain the necked composite pipe; (3) apply ultrasonic vibration around the necked composite pipe in step (2) to assist the plastic deformation of the pipe; (4) apply ultrasonic vibration in step (3), Apply air pressure inside the necked composite pipe and heat it; (5) Keep the temperature constant, then release the internal pressure, and finally take it out for air cooling to get the final product. The necking processing and preparation method of the fiber-metal pipe provided by the invention enables the pipe fitting to have high surface quality and good mechanical properties.

The invention relates to a pure-gold watchcase manufacturing method, comprising raw material melting, rough blank forming, stamping treatment and cutting treatment. The invention also relates to a pure-gold watchcase obtained by the above method, and a dial plate comprising the pure-gold watchcase. The dial plate also comprises an inner container, a movement, a graduated disk, a watch glass, a watch crown and an ear part. The inner container comprises an inner container body and a fixed part. The pure-gold watchcase is wrapped at the outer wall of the inner container. The movement is arranged inside the inner container. The graduated disk is arranged on the top surface of the movement in a covering manner. The watch glass is disposed at an opening of the inner container in a covering manner. With the gold content higher than nine hundred and ninety per one thousand, the pure-gold watchcase achieves good machining performance, allows surface treatment, has high strength and hardness and is adapted to normal knock and collision when used. The rejection rate in the pure-gold watchcase manufacturing process is low, and the production efficiency is high. The dial plate comprising the pure-gold watchcase has good waterproofness, and the strength of an outer shell of the dial plate is further enhanced, so the service lifetime of the dial plate is prolonged.

The invention discloses a nano SiC particle reinforced aluminum matrix composite material and a preparation method thereof. The microstructure of the aluminum-based composite material is composed of ultra-fine grains, nano-SiC particles and nano-precipitated phases. The specific preparation method includes the following steps: mixing nano-SiC and aluminum alloy powder; Uniform dispersion of nanoparticle powder; the mixed powder is made into a block sample by spark plasma sintering; the block sample is heated, and hot-extruded under a certain pressure and extrusion ratio, and consolidated to obtain a fully dense aluminum matrix composite material Rods: The extruded aluminum-based composite rods are subjected to T6 heat treatment, during which the dissolution of coarse precipitates and the precipitation of fine and uniformly dispersed nano-precipitates occur. The invention prepares the ultra-fine structure nano-aluminum matrix composite material, which has the advantages of high strength and high elongation.