554results about How to "Uniform mechanical properties" patented technology

The invention provides a thin high-strength hot-rolled steel sheet with a thickness of not more than 3.5 mm which has excellent stretch flangeability and high uniformity in both shape and mechanical properties of the steel sheet, as well as a method of producing the hot-rolled steel sheet. A slab containing C: 0.05-0.30 wt %, Si: 0.03-1.0 wt %, Mn: 1.5-3.5 wt %, P: not more than 0.02 wt %, S: not more than 0.005 wt %, Al: not more than 0.150 wt %, N: not more than 0.0200 wt %, and one or two of Nb: 0.003-0.20 wt % and Ti: 0.005-0.20 wt % is heated at a temperature of not higher than 1200° C. The slab is hot-rolled at a finish rolling end temperature of not lower than 800° C., preferably at a finish rolling start temperature of 950-1050° C. A hot-rolled sheet is started to be cooled within two seconds after the end of the rolling, and then continuously cooled down to a coiling temperature at a cooling rate of 20-150° C./sec. The hot-rolled sheet is coiled at a temperature of 300-550° C., preferably in excess of 400° C. A fine bainite structure is obtained in which the mean grain size is not greater than 3.0 mum, the aspect ratio is not more than 1.5, and preferably the maximum size of the major axis is not greater than 10 mum.

The invention discloses a low-welding crack sensitivity steel board and manufacturing method, which comprises the following parts: not more than 0.07% C, 0.15-0.40% Si, 1.00-1.60% Mn, not more than 0.015% P, not more than 0.010% S, not more than 0.30% Cu, not more than 0.50% Ni, not more than 0.30% Cr, not more than 0.30% Mo, not more than 0.08% V, not more than 0.08% Nb, 0.010-0.020% Ti, not more than 0.003% B, Fe and inevitable impurity. The invention is characterized by the following: (1)displaying lower welding crack sensitivity component with Pcm not more than 0.20%; (2)mating the strength and flexibility reasonably with fitful yielding ratio; (3)making the price and property of the steel board superior to the congeneric import product; (4)making the maximum breadth of steel board to 4000mm; (5)simplifying the technique to ensure higher flatness without quenching water.

The invention provides an Al-Fe-Ba-RE aluminum alloy, and a preparation method of the Al-Fe-Ba-RE aluminum alloy. The method comprises the steps that: (a) an aluminum alloy ingot is cast; (b) the aluminum alloy ingot is subjected to a homogenization treatment; and the obtained aluminum alloy ingot is rolled, such that an aluminum alloy rod material is obtained; (c) the aluminum alloy rod material obtained in the step (b) is subjected to a batch-type annealing treatment; and (d) the aluminum alloy rod material obtained in the step (c) is subjected to an aging treatment, such that aluminum alloy is obtained. The invention also provides a power cable. According to the invention, through the selection and control over added elements and the adoption of a reasonable preparation process, the obtained aluminum alloy is provided with good comprehensive performance.

The invention provides an Al-Fe-Tl-RE aluminum alloy, and a preparation method of the Al-Fe-Tl-RE aluminum alloy. The method comprises the steps that: (a) an aluminum alloy ingot is cast; (b) the aluminum alloy ingot is subjected to a homogenization treatment; and the obtained aluminum alloy ingot is rolled, such that an aluminum alloy rod material is obtained; (c) the aluminum alloy rod material obtained in the step (b) is subjected to a batch-type annealing treatment; and (d) the aluminum alloy rod material obtained in the step (c) is subjected to an aging treatment, such that aluminum alloy is obtained. The invention also provides a power cable. According to the invention, through the selection and control over added elements and the adoption of a reasonable preparation process, the obtained aluminum alloy is provided with good comprehensive performance.

The invention provides an Al-Fe-Bi-RE aluminum alloy, and a preparation method of the Al-Fe-Bi-RE aluminum alloy. The method comprises the steps that: (a) an aluminum alloy ingot is cast; (b) the aluminum alloy ingot is subjected to a homogenization treatment; and the obtained aluminum alloy ingot is rolled, such that an aluminum alloy rod material is obtained; (c) the aluminum alloy rod material obtained in the step (b) is subjected to a batch-type annealing treatment; and (d) the aluminum alloy rod material obtained in the step (c) is subjected to an aging treatment, such that aluminum alloy is obtained. The invention also provides a power cable. According to the invention, through the selection and control over added elements and the adoption of a reasonable preparation process, the obtained aluminum alloy is provided with good comprehensive performance.

The invention relates to a carbon-ceramic composite brake disc and a preparation method thereof and belongs to the technical field of preparation of carbon-ceramic composites and brake discs. The carbon-ceramic composite brake disc comprises the following components by mass percent: 12% to 20% of short carbon fiber, 20% to 45% of matrix carbon, 30% to 55% of SiC and 2% to 6% of Si, wherein the short carbon fiber is 15-30mm in length. The method comprises the following steps: carbonizing a carbon fiber-reinforced blank body with the density of 0.9g/cm<3> to 1.3g/cm<3> so as to obtain a porous carbon/carbon (C/C) body; then performing dipping on the porous C/C body, cross-linking solidification and splitting decomposition so as to generate a SiC base body on the matrix carbon; performing the dipping, the cross-linking solidification and the splitting decomposition again until the density of an obtained C/C-SiC composite blank body reaches 1.6-1.9g/cm<3>; and performing silicon leaching treatment on the C/C-SiC composite blank body and anti-oxidation treatment and assembling, thus obtaining the carbon-ceramic composite brake disc. According to the method provided by the invention, the difficult problem that a metal brake disc is poor in thermal dissipation and abrasion resistance and heavy in weight in the prior art is effectively solved. The preparation method is simple; and the obtained carbon-ceramic composite brake disc is high in thermal stability, light in weight and resistant to abrasion, and cannot generate thermal vibration.

The invention provides an Al-Fe-Ni-RE aluminum alloy, and a preparation method of the Al-Fe-Ni-RE aluminum alloy. The method comprises the steps that: (a) an aluminum alloy ingot is cast; (b) the aluminum alloy ingot is subjected to a homogenization treatment; and the obtained aluminum alloy ingot is rolled, such that an aluminum alloy rod material is obtained; (c) the aluminum alloy rod material obtained in the step (b) is subjected to a batch-type annealing treatment; and (d) the aluminum alloy rod material obtained in the step (c) is subjected to an aging treatment, such that aluminum alloy is obtained. The invention also provides a power cable. According to the invention, through the selection and control over added elements and the adoption of a reasonable preparation process, the obtained aluminum alloy is provided with good comprehensive performance.

The invention provides an Al-Fe-Ta-RE aluminum alloy, and a preparation method of the Al-Fe-Ta-RE aluminum alloy. The method comprises the steps that: (a) an aluminum alloy ingot is cast; (b) the aluminum alloy ingot is subjected to a homogenization treatment; and the obtained aluminum alloy ingot is rolled, such that an aluminum alloy rod material is obtained; (c) the aluminum alloy rod material obtained in the step (b) is subjected to a batch-type annealing treatment; and (d) the aluminum alloy rod material obtained in the step (c) is subjected to an aging treatment, such that aluminum alloy is obtained. The invention also provides a power cable. According to the invention, through the selection and control over added elements and the adoption of a reasonable preparation process, the obtained aluminum alloy is provided with good comprehensive performance.

The invention discloses sulphoaluminate maritime work cement and a preparation method thereof. The sulphoaluminate maritime work cement comprises the following main raw materials in parts by weight: 50-80 parts of cement clinker, 8.0-20 parts of anhydrite, 0-30 parts of limestone, 0-30 parts of slag, 0.1-0.5 part of water reducing agent, 0.001-0.005 part of air entraining agent, 0.1-0.5 part of retarder and 2-5 parts of silicon powder. The preparation method comprises the following steps of: respectively smashing, grinding and homogenizing the sulphoaluminate cement clinker, the anhydrite, the limestone and the slag; then, burdening at a ratio, and evenly mixing; adding the water reducing agent, the air entraining agent, the retarder and the silicon powder; and mixing and homogenizing to obtain the product. The concrete mixed by the sulphoaluminate maritime work cement has the advantages of small bleeding rate and high slurry viscidity. The slurry has strong covering and supporting action on aggregate. The concrete keeps good homogeneity and has the advantages of hard and quick early strength, continuously-increased later strength, good slurry structure compactness and high volume stability and is convenient to use and operate for constructing.

The invention provides an Al-Fe-W-RE aluminum alloy, and a preparation method of the Al-Fe-W-RE aluminum alloy. The method comprises the steps that: (a) an aluminum alloy ingot is cast; (b) the aluminum alloy ingot is subjected to a homogenization treatment; and the obtained aluminum alloy ingot is rolled, such that an aluminum alloy rod material is obtained; (c) the aluminum alloy rod material obtained in the step (b) is subjected to a batch-type annealing treatment; and (d) the aluminum alloy rod material obtained in the step (c) is subjected to an aging treatment, such that aluminum alloy is obtained. The invention also provides a power cable. According to the invention, through the selection and control over added elements and the adoption of a reasonable preparation process, the obtained aluminum alloy is provided with good comprehensive performance.

Methods and apparatuses for coating surface of medical devices using coating heads are disclosed. In one embodiment, the invention includes a coating method using a coating head, wherein the coating head comprises at least one outlet orifice from which flows a coating material, to deposit at least one layer of coating material dispelled through the outlet orifice onto the surface of the medical device. In another embodiment, a slide coating head is used to deposit multiple layers of superposed coating materials. These methods are used to apply one or more coating materials, simultaneously or in sequence. In certain embodiments of the invention, the coating materials include therapeutic agents, polymers, sugars, waxes, or fats.

The invention discloses 690MPa thick steel plate for ocean engineering and a manufacturing method of the 690MPa thick steel plate, and belongs to the technical field of steel for the ocean engineering. The steel plate comprises the following chemical components: 0.08-0.15% of C, 0.10-0.30% of Si, 1.0-1.50% of Mn, 0.03-0.04% of Alt, 0.02-0.06% of Nb, 0.03-0.06% of V, 0.010-0.02% of Ti, 0.1-0.5% of Mo, 0.5-1.6% of Ni, 0.1-0.4% of Cu, 0.4-1.2% of Cr, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb+V+Ti, 0.0005-0.0017% of B, and the balance of Fe and inevitable impurities. Quenching temperature and tempering temperature are controlled strictly; the thickness of the produced steel plate is 50-120mm; and the microstructure of the steel plate is tempered sorbite and a little tempered bainite. The steel plate and the manufacturing method have the advantages that the lamellar tearing resistance and low temperature toughness are ensured; uniformity of the thick steel plate in the thickness direction is ensured; and the production cost is reduced.

The invention relates to the technical field of rolling of metal composite plates, specifically relates to a method for preparing an aluminum-magnesium-aluminum three-layer metal composite plate by prefabricating a crossed corrugated interface, and aims to solve the technical problems of low composite plate bonding strength and serious texture of a magnesium plate basal plane in a conventional method for preparing the aluminum-magnesium-aluminum three-layer metal plate. According to the technical scheme, the method comprises the following steps: rolling a magnesium plate into a double-faced crossed corrugated shape; then covering two layers of aluminum plates on the upper surface and the lower surface of the magnesium plate; flatly rolling the three layers of plates together; and processing to obtain the three-layer metal composite plate with the upper surface and the lower surface being planes and the middle bonding surface being crossed corrugated. With the adoption of the method, the basal plane texture of a magnesium plate can be effectively weakened, and the bonding strength can be improved. Magnesium with uniform mechanical property can be obtained when the texture strength is obviously reduced, and because a weak and dispersed basal plane texture is obtained, basal plane slippage and twin crystal formation are facilitated during stretching, so that the forming property of the plate is improved.

A method for fabricating an article of a titanium-base alloy, such as an alpha-beta titanium gas turbine fan or compressor disk, uses a starting ingot having a thickness of at least about 20 inches, and which is made of a titanium-base alloy having a temperature-composition phase diagram with a beta-phase field and an alpha-beta phase field. The method includes first forging the starting ingot in the beta-phase field to form an in-process billet, thereafter second forging the in-process billet in the alpha-beta phase field, thereafter heating the in-process billet into the beta-phase field to recrystallize the in-process billet, and thereafter third forging the in-process billet. The step of third forging includes forging the in-process billet from a first forging thickness of not less than about 15 inches to a second forging thickness of not more than about 13 inches, at a third-forging temperature of from about 1550° F. to about 1725° F.

The invention discloses a 80Kg grade steel plate with ultrahigh toughness and extreme thickness and a manufacturing method of the steel plate. The steel plate comprises the following components in percentage by weight: 0.08-0.13% of C, Si smaller than or equal to 0.10%, 0.80-1.20% of Mn, P smaller than or equal to 0.013%, S smaller than or equal to 0.0030%, 0.20-0.45% of Cu, 1.00-1.60% of Ni, 0.35-0.65% of Cr, 0.30-0.60% of Mo, 0.040-0.070% of Als, 0.010-0.030% of Nb, 0.030-0.060% of V, 0.004-0.010% of Ti, N smaller than or equal to 0.0050%, 0.001-0.004% of Ca, 0.0008-0.0016% of B, and balance of Fe. According to the manufacturing method, a component system of low C-ultralow Si-medium Mn-(Ti+V+Nb+B) microalloyed steel is used as a basis, special rolling control and offline gradient tempering technology (QQ+T) are optimized, so that microstructures of the produced steel plate are small tempered bainite+ tempered martensite, the average crystal colony size is less than 20 microns, excellent obdurability and plasticity match is obtained, and mechanical performance in the direction of the thickness of the steel plate is uniform.

The invention discloses an aluminium alloy conductor for automotive wires, which has the advantages of high heat resistance, conductivity, tensile strength, extensibility and fatigue resistance, and a manufacturing method thereof. The alloy contains 0.3 to 0.8 weight percent of iron, 0.05 to 0.20 percent of silicon, 0.1 to 0.5 weight percent of magnesium, 0.1 to 0.3 weight percent of copper, 0.001 to 0.04 weight percent of boron, 0.001 to 0.04 weight percent of zirconium, 0.001 to 0.04 weight percent of yttrium, and the balance of aluminium and inevitable impurities, wherein one or two elements, except the aluminium and the inevitable impurities, account for 0.1 to 2.0 weight percent. The manufacturing method comprises the following steps of: adding the iron, silicon, magnesium, copper, boron, zirconium, yttrium and aluminium into a smelting furnace; smelting, and casting and rolling; performing intermediate annealing treatment; drawing into aluminium alloy filaments with the diameterof 0.5mm; and stranding into wire cores, and performing annealing treatment. The conductor prepared by the method has the tensile strength of 210MPa and above, the elongation at break of over 10 percent, the conductivity of over 58 percent, and excellent heat resistance and flexibility.

The invention discloses a large thickness steel plate for hydrogenation reaction chamber reeling equipment and a production method thereof. The steel plate takes Cr-Mo steel as the base, an amount of alloying elements, such as Ni, Cu, Al, Nb, Mn, Cr and the like are added, the contents of harmful elements, such as Sn, Sb, As, P, S and the like are controlled, and the finished large thickness steel is prepared by adopting the processes of electric furnace smelting, LF refining furnace refining, throwing down line stacking for slow-cooling, electroslag remelting, rolling and product forming, diffusion hydrogen annealing, normalizing and tempering heat treatment and the like. The thickness of the steel plate reaches 198 mm, the weight of single steel plate reaches 25 tons, the high temperature tensile strength and yield strength of the steel plate are good, the lower temperature toughness at minus 30 DEG C is good, the steel plate has good tempering embrittlement sensitivity coefficient, and the purity of the produced steel plate is high, the component is uniform, the inner part is compact, and the mechanical property is uniform. The steel plate can meet the operation requirement of hydrogenation reaction chamber reeling equipment, and is suitable for the production of the main structural parts of all hydrogenation reaction chamber reeling equipment.

The invention provides an Al-Fe-Pb-RE aluminum alloy, and a preparation method of the Al-Fe-Pb-RE aluminum alloy. The method comprises the steps that: (a) an aluminum alloy ingot is cast; (b) the aluminum alloy ingot is subjected to a homogenization treatment; and the obtained aluminum alloy ingot is rolled, such that an aluminum alloy rod material is obtained; (c) the aluminum alloy rod material obtained in the step (b) is subjected to a batch-type annealing treatment; and (d) the aluminum alloy rod material obtained in the step (c) is subjected to an aging treatment, such that aluminum alloy is obtained. The invention also provides a power cable. According to the invention, through the selection and control over added elements and the adoption of a reasonable preparation process, the obtained aluminum alloy is provided with good comprehensive performance.

The invention discloses a high-strength and high-toughness steel plate for a 630MPa-grade tempered low-temperature spherical tank and a manufacture method thereof. The high-strength and high-toughness steel plate comprises the following components by weight percent: 0.07-0.09% of C, 0.15-0.25% of Si, 1.40-1.50% of Mn, less than or equal to 0.008% of P, less than or equal to 0.001% of S, 0.30-0.40% of Ni, 0.16-0.20% of Mo, 0.015-0.025% of Nb, 0.02-0.06% of V, 0.007-0.015% of Ti, less than or equal to 0.0030% of O, less than or equal to 0.0040% of N, 0.020-0.040% of Al, 0.0005-0.0030% of Ca, and the balance of Fe and unavoidable impurities, wherein the welding cold crack sensitivity coefficient Pcm value is 0.16-0.20% and the hot crack sensitivity coefficient Psr is less than or equal to 0.00%. By adopting the high-strength and high-toughness steel plate, the safety of the spherical tank integral structure is guaranteed, the yield strength of the steel plate is greater than or equal to 510 MPa, the tensile strength is greater than or equal to 630 MPa, the ductility is greater than or equal to 18%, the Charpy notch ballistic work average value in the plate thickness 1/4 part at -50 DEG C is greater than or equal to 2000 J, the single value is greater than or equal to 150 J, the Charpy notch ballistic work average value in the plate thickness 1/2 part at -50 DEG C is greater than or equal to 150 J, the single value is greater than or equal to 100 J, and the steel plate nil ductility transition temperature (NDTT) is less than or equal to -50 DEG C.

The invention provides an Al-Fe-Os-RE aluminium alloy and a preparation method thereof. The preparation method comprises the following steps of: a) casting an aluminium alloy cast ingot; b) homogenizing the aluminium alloy cast ingot and rolling the homogenized aluminium alloy cast ingot to obtain an aluminium alloy rod material; c) intermittently annealing the aluminium alloy rod material obtained in the step b); and d) aging the aluminium alloy rod material obtained in the step c), thus obtaining the aluminium alloy. The invention also provides a power cable. The aluminium alloy has better overall performances by selecting and controlling the added elements and adopting a reasonable preparation process.

The invention discloses an ultra-high strength glass fiber reinforced thermoplastic resin composite plate. The composite plate comprises the following components in parts by weight: 40-60 parts of thermoplastic resin, 40-60 parts of continuous ultra-high strength glass fiber and 0.2-0.5 parts of silane coupling agent. The invention further discloses a preparation method of the ultra-high strength glass fiber reinforced thermoplastic resin composite plate. The ultra-high strength glass fiber reinforced thermoplastic resin composite plate disclosed by the invention has the advantages of high mechanical properties, relatively good flame retardancy, aging resistance and high temperature resistance, excellent comprehensive performances, low price and relatively high performance-price ratio.

The invention belongs to the technical field of constructional steel for ships and ocean engineering and in particular relates to steel plates for a 355MPa-level easy-to-weld ocean platform and a production process of the steel plates. Two steel plates of which the thickness specifications are [6-40]mm and [40-60]mm are comprised, wherein the steel plate with the thickness specification of [6-40]mm comprises the following chemical components in percentage by mass: 0.10-0.15 percent of C, 0.20-0.50 percent of Si, 1.20-1.50 percent of Mn, not more than 0.015 percent of P, not more than 0.005 percent of S, 0.020-0.050 percent of Nb, 0.010-0.050 percent of V, 0.008-0.020 percent of Ti, 0.015-0.055 percent of Als, not more than 0.43 percent of Ceq, not more than 0.23 percent of Pcm and the balance of Fe and inevitable impurities; and the steel plate with the thickness specification of [40-60]mm comprises the following chemical components in percentage by mass: 0.10-0.15 percent of C, 0.20-0.50 percent of Si, 1.30-1.60 percent of Mn, not more than 0.015 percent of P, not more than 0.005 percent of S, 0.030-0.060 percent of Nb, 0.020-0.060 percent of V, 0.008-0.020 percent of Ti, 0.015-0.055 percent of Als, not more than 0.12 percent of Nb+V+Ti, not more than 0.43 percent of Ceq, not more than 0.23 percent of Pcm and the balance of Fe and inevitable impurities. According to the production method, the steel plates for the easy-to-weld ocean platform are produced by adopting low Ceq, low Pcm, Nb as well as V and Ti microalloy components and a normalizing heat treatment process and are lower in production cost, even in mechanical property and favorable in welding property.