48results about How to "Improve high temperature deformation resistance" patented technology

The invention relates to an integrated adjustable rack used for hoisting in a continuous annealing furnace between dense charging and processing of metal plates, belts, foil and other products. The integrated adjustable rack comprises a rack body, wherein the rack body comprises a rectangular underpan; the underpan comprises an upper underpan and a lower underpan; the upper underpan is composed of parallel top cross beams and top longitudinal beams connected with one end of each top cross beam; the lower underpan is composed of parallel cross beams and parallel longitudinal beams which are crossed; the joint of each cross beam and each longitudinal beam between the upper underpan and lower underpan is provided with a column; a top longitudinal beam is arranged between the other ends of every two parallel top cross beams of the upper underpan; a movable cross beam is arranged between every two columns connecting the top cross beams on the left and right sides of the rack body, and positioned between the upper underpan and lower underpan; both ends of the movable cross beam are provided with a U chute which is matched with the column; axis pin holes are distributed on the column; an axis pin which is inserted into the axis pin hole is arranged below the U chute; the movable cross beams on the left and right sides of the rack body are provided with symmetrical slide block seats; and a coil core tube is arranged between the symmetrical slide block seats.

The invention discloses a method for detecting a void of coarse aggregate. The technical problem solved by the method is to compare the detection result of the void of the coarse aggregate with the detection result of the void of the coarse aggregate in an asphalt mixture. The method comprises the following steps of: adopting the dry tamping method to detect the void of the coarse aggregate; adding mineral powder and asphalt into the coarse aggregate and mixing the coarse aggregate, the mineral powder and the asphalt; forming a test piece; detecting the relative density of bulk volume, the mass percentage of the coarse aggregate accounting for the total mass and the relative density of synthesis bulk volume of the coarse aggregate accounting for water volume; and calculating the void of the coarse aggregate in the test piece. Compared with the prior art, the mineral powder and the asphalt are added into the coarse aggregate, the detection method is the same as that of the void of the coarse aggregate in the asphalt mixture, and the detection result is comparable, so that the skeleton-compact standard of the coarse aggregate formed by the detection method more scientifically evaluates the skeleton-compact degree of the coarse aggregate in the asphalt mixture.

The invention relates to a full-ferrite enamel steel for a heat exchanger. The full-ferrite enamel steel comprises the following chemical components in percentages by weight: less than or equal to 0.0050% of C, 0.10-0.50% of Mn, less than or equal to 0.010% of Si, less than or equal to 0.020% of P, 0.015-0.045% of S, less than or equal to 0.010% of Als, 0.010-0.055% of Nb, less than or equal to 0.0030% of B and 0.010-0.050% of O; the production method comprises the following steps of pretreating molten iron, smelting, refining and continuously casting by virtue of a converter; heating the cast blank; carrying out hot rolling; coiling and acid pickling; carrying out cold rolling; annealing; finishing for later use. The microstructure of the enamel steel disclosed by the invention is full ferrite, the grain size of ferrite reaches Grade 11, the main inclusions are long-wire-shaped MnS and granular Mn / Nb composite oxides, the precipitated phases are fine NbC / N and BN particles, Rel is 180-240MPa, the tensile strength is 280-360MPa, the elongation is 36-46%, the hydrogen permeation time of the steel plate is equal to or greater than 25min / mm<2>, no scute burst is caused after enamelling, enamel adhesion strength is greater than A1 level and the pinhole rate is less than 10 / m<2>.

The invention discloses a high-strength wear-resisting heat-resisting aluminium alloy material and a preparation process thereof. The material comprises, by weight, 4.0-6.5% of copper, 0.06-0.4% of titanium, 0.08-0.6% of manganese, 0.03-0.4% of antimony, 0.4-0.6% of nickel, 1.2-1.8% of cobalt, 0.2-0.3% of zirconium, 0.2-1.8% of rare earth and the balance aluminum. During preparation of the material, a special heat treatment process is used. The material has the advantages of being capable of improving the mechanical strength, the abrasive resistance and the high-temperature deformation resistance of an aluminium alloy simultaneously, the material can be used for cast members which are required to bear a certain high temperature and have high mechanical performance requirements, and a new field of application of the aluminium alloy material is developed.

The invention discloses a bituminous pavement structure. The bituminous pavement structure comprises a bituminous pavement layer laid on the ground surface; gaps facilitating rapid leakage of rainwater are formed in the bituminous pavement layer; sand-based water permeable kerbs are arranged on the two sides of the bituminous pavement layer; the bituminous pavement layer is sequentially provided with a laying layer, a water stabilizing layer and a stress absorption layer from top to bottom; a water permeable surface layer is arranged below the bituminous pavement layer; a water permeable base layer is arranged below the water permeable surface layer; a pipe network used for collecting rainwater is embedded into the water permeable base layer; filter ditches are formed in the two sides of the water permeable base layer; the two ends of the pipe network are connected to the filter ditches; the filter ditches are internally provided with a plurality of watering pipes connected with a surrounding green belt; and water guide pipes are arranged at the two ends of the filter ditches and connected to rainwater openings. As the bituminous pavement layer is arranged, the pavement anti-cracking capacity is improved, pavement water damage and rutting are reduced, original waste pavement materials can be fully used, the service life of the pavement is prolonged, the rapid leakage function is achieved for accumulated water, and accumulated water on the pavement can be rapidly drained.

The invention discloses a low-stress dipping pipe for an RH vacuum furnace. The low-stress dipping pipe sequentially comprises a refractory brick lining, a filling layer and a steel barrel from inside to outside. No hole is formed in the wall surface of the steel barrel. An annular round metal pipe or an annular round metal rod is welded to the bottom surface of the steel barrel. The outer wall of the lower portion of the top of the steel barrel and the outer wall of the annular round metal pipe or the outer wall of the annular round metal rod are each paved with a buffer layer. V-shaped metal anchoring pieces and double-V-shaped metal anchoring pieces are uniformly welded to the outer wall of the steel barrel or the outer wall of the annular round metal rod in the axial spaced layered circumferential direction of the steel barrel and penetrate through the buffer layers. According to the low-stress dipping pipe for the RH vacuum furnace, the problem that damage and deterioration are caused due to the fact that the difference of the material performances of all components in a dipping pipe complex structure is remarkable is effectively solved, and the comprehensive purposes of reducing the structural stress and the heat stress of the dipping pipe, improving the dipping pipe resistance to crack, stripping and damage and the integrality and the structural stability of the dipping pipe, prolonging the service life of the dipping pipe and the like are achieved.

The invention relates to a high-modulus asphalt particle for road building and a preparation method thereof. The high-modulus asphalt particle comprises the following components in parts by mass: 40-80 parts of modified asphalt and 20-60 parts of filler, wherein the modified asphalt comprises the following raw materials in parts by mass: 10-20 parts of a polymer, 0.1-5 parts of an anti-aging agent, 2-4 parts of a thickener, 2-5 parts of a modifier, 1-3 parts of a crosslinking agent and 50-90 parts of matrix asphalt, wherein the matrix asphalt is one of Shell No. 70, Shell No.90, SK No. 70 and SK No. 90. Compared with the prior art, the preparation method is simple in process and low in cost, the waste utilization is achieved and the asphalt particle is suitable for industrial production; by the prepared high-modulus asphalt particle, the rutting resistance, low-temperature crack resistance, water damage resistance and aging resistance of asphalt concrete can be significantly improved and the service life of the asphalt pavement is prolonged; and the high-modulus asphalt particle is very safe and convenient to store and transport, is energy-saving and environment-friendly and has significant economic and social benefits.