40results about How to "Make up for loss of strength" patented technology

The invention provides a compound concrete foaming agent and its preparation method and application. 1.5-2.5 parts of anhydrous sodium carbonate, 3.5-4.5 parts of industrial caustic soda, 3-5 parts of triethanolamine, 0.2-0.5 parts of industrial grade hydrochloric acid, 53.5-55.8 parts of water; the B component is: triethanolamine 0.2- 0.5 parts, 8-10 parts of sodium sulfate, 12-15 parts of sodium nitrite, 10-25 parts of calcium chloride, 54.7-64.5 parts of water. The composite concrete foaming agent of the present invention can not only increase the amount of foaming agent, but also compensate the concrete strength and solidification time; it can not only produce ultra-low-capacity foamed concrete, but also use a large amount of waste residues such as industrial and construction waste , to produce lightweight foamed concrete.

The invention provides a Cu-containing nano-phase strengthened easy-weld steel and a preparation method thereof. The weight percent composition is: C<0.05, Si:0.1~0.3, Mn:0.5~1.5, S<0.002, P<0.004, Cu:1.5~2.5, Ni:4~8, Al:0.3~0.8, Mo:0.2 ~1, Cr<1, Nb: 0.01~0.04, Ti: 0.01~0.05, V: 0.01~0.08, and the rest are Fe and unavoidable impurity elements. Induction melting and casting are carried out under argon as a protective gas; the ingot is heated at 1100-1200°C for 1-3h, and then hot-rolled directly. High-pressure water cooling, hot-rolled deformation of 50%-90%; the rolled steel plate is selectively subjected to solution and aging heat treatment to obtain high-strength, high-toughness and easy-to-weld steel. The alloy steel of the invention has high strength, good plasticity, good low temperature impact toughness and easy welding. In addition, the processing technology has high controllability, low cost and simple operation.

The invention relates to a low-cost Q355C steel plate production process. The chemical composition according to mass percentage is as follows: C: 0.11%-0.20%, Si: ≤0.20-0.45%, Mn: 1.1%-1.6%, Alt: 0.015%-0.045% , P: ≤0.025%, S: ≤0.015%, the rest is Fe; through converter smelting, reasonable end-point carbon content control, complete deoxidation, white slag refining and soft blowing, calcium treatment at the same time, and continuous casting to improve the internal quality of the steel plate ;Through the two-stage controlled rolling of rough and finish rolling, the rolling temperature, speed and pass are reasonably distributed to further improve the internal quality of the steel plate. The invention reduces the C content, improves the impact toughness at 0°C, and replaces expensive Nb and V with cheap micro-alloying elements Al to maximize profits, and further improves the impact toughness at the same time, and produces Q355C steel plates through a rolling process that matches the composition. Ton of steel can be reduced by 50 yuan.

An ultra-low-carbon, high-strength, high-plasticity martensitic steel and a preparation method thereof, belonging to the field of steel preparation, the mass percentage of the chemical composition of the martensitic steel is: C: 0.01-0.05%, Si: 0.2-0.5%, Mn: 0.5~0.8%, Cr: 0.8~1.2%, Cu: 2.0~4.0%, Ni: 10.0~11.0%, V: 0.05~0.15%, Mo: 0.5~0.9%, Al: 0.2~0.5%, P: ≤ 0.02%, S: ≤0.02%, the balance is Fe. Adding Cu, Ni, Al and Mn elements to the alloy of the present invention can precipitate rich Cu and Ni during the aging heat treatment process. 3 Al(Mn) phase, so as to realize the high strength of the alloy and excellent welding performance; the martensitic steel of the present invention does not need rolling, cryogenic treatment, simple heat treatment process, high production efficiency, and easy realization.

The invention relates to a highly durable concrete product with a gradient structure and a preparation method thereof. The concrete product is prepared by the following methods: 1) mixing concrete: replacing part of the cementitious material with a dense admixture to mix to obtain concrete; 2) mixing the concrete Pour it into a mold to form it, and then obtain a concrete specimen after curing and demoulding; 3) Dry the surface of the concrete specimen, then place it in an autoclave for carbonation curing under a carbon dioxide atmosphere, and then perform standard curing to obtain a gradient Structural highly durable concrete products. The present invention forms a gradually dense gradient structure from inside to outside on the surface of concrete specimens through carbonization curing treatment. The carbonized dense layer on the surface can improve the corrosion resistance of concrete materials and prolong the service life, and due to the high strength of the outer layer, a hoop effect is formed. The hoop effect can improve the deformation resistance of the specimen and accelerate the hardening of the concrete specimen.

Disclosed is a microwave-impregnating modified treatment process for wood for ground heating solid-wood flooring. The process comprises a. microwave treatment: putting wood in a microwave treatment device to undergo microwave treatment, wherein a microwave treatment process is carried out three times, and a treatment time interval is 1-3 min; regulating the radiation power to 2-5 KW the first time, the radiation time being 30-60 s; regulating the radiation power to 1-4 KW the second time, the radiation time being 20-40 s; and regulating the radiation power to 0.2-0.8 KW the third time, the radiation time being 8-15 s; b. cooling: carrying out cooling to reduce the temperature, and removing the wood from a tank when the temperature is reduced to 25-40°C; c. primary impregnation: impregnating the wood in an analytically pure water solution in a mass fraction of 20-30 % at an impregnation temperature of 50-70°C, taking out the wood and drying same after impregnating the wood for 25-35 h, wherein drying the wood is carried out until the water content reaches 8 %; d. secondary impregnation: putting the dried wood in a vacuum impregnating tank, regulating a vacuum degree to -0.20-(-0.10) MPa, maintaining the vacuum degree for 10-20 min, using a negative pressure to inject resin into a tank body at the same time, so that the wood is impregnated in the resin, and controlling the pressure to be 1-3 MPa and maintaining the pressure for 1-4 h; and e. obtaining the finished product: drying the wood and obtaining a final material.

The invention discloses a cast welding die for a storage battery, which belongs to the field of storage batteries. According to the cast welding die, the problem that a die is easy to break off is solved. The cast welding die comprises an upper plate and a lower plate, wherein the upper plate can be buckled with the lower plate; after the upper plate is mutually buckled with the lower plate, an inner cavity is formed by the lower surface of the upper plate and the upper surface of the lower plate; two upper reinforcing parts are respectively arranged on two sides of the upper plate; the upper reinforcing parts and the upper plate form an integrated structure; the lower surface of the upper plate is a polished surface; two lower reinforcing parts are respectively arranged on two sides of the lower plate; the lower reinforcing parts and the lower plate form an integrated structure; the upper surface of the lower plate is a polished surface; a plurality of mounting columns are arranged on the lower surface of the upper plate; a plurality of mounting seats are arranged at the positions corresponding to the mounting columns, of the upper surface of the lower plate. The lower surface of the upper plate and the upper surface of the lower plate are kept as the polished surfaces, so that the step of processing reinforcing ribs is eliminated and cutting scars caused by cutting of the reinforcing ribs are avoided while the cost is reduced; the reinforcing parts are respectively and additionally arranged on two sides of each of the upper plate and the lower plate so as to make up the strength loss caused by the reinforcing ribs.

The invention provides tensile strength more than or equal to 780MPa grade hot-rolled dual phase steel. The dual-phase steel comprises the following components in percentage by weight: 0.05-0.08 percent of C, not more than 0.5 percent of S, 0.6-1.2 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.006 percent of N, 0.01-0.1 percent of Als, 0.05-0.25 percent of Ti, less than or equal to 0.6 percent of Cr or less than or equal to 0.003 percent of B or mixture of Cr and B. The production method by using CSP comprises the following steps: melting and continuously casting to form a slab; heating the continuous cast slab; rolling; carrying out laminar cooling; reeling; and naturally cooling to room temperature. The hot-rolled dual phase steel has the tensile strength of more than or equal to 780MPa, elongation of more than or equal to 15 percent and yield ratio of less than or equal to 0.70. An insulation cover additionally covers the intermediate insulation section, and the band steel cooling speed is reduced, so that generation of pearlite phase change can be effectively prevented. Production of hot-rolled dual phase steel with thickness of 1.2-4.0mm can be realized, the product has the advantages of uniform structure, small molding resilience and no cracking, existing equipment is utilized without adopting ultra fast cooling and other equipment, the production efficiency is high, and the investment is small.

The invention belongs to the technical field of building materials, and in particular relates to a water-permeable foam concrete. The permeable foam concrete is made of the following raw materials in parts by weight: 160-420 parts of cement, 0.2-0.4 parts of foaming agent, 2-5 parts of water reducing agent, 1-5 parts of expanding agent, and 1-5 parts of plasticizer 5 parts and 90‑150 parts water. The foaming agent is made of the following raw materials in parts by weight: 200-260 parts of foaming agent, 20-30 parts of foam stabilizer, 3-8 parts of flocculant, 1-2 parts of thickener, 1.5 parts of preservative ‑2.5 parts and water 420‑480 parts. The water-permeable foam concrete of the present invention has a loose structure, does not feel greasy, has a good effect of connecting holes, has high water-permeable characteristics, and has high compressive strength at the same time, thereby improving the durability of the product.