7results about How to "Qualified performance" patented technology

The application discloses a method for producing large-size high-carbon chromium bearing steel rod with small compression ratio, which comprises continuous casting and continuous rolling processes, wherein the continuous casting process comprises the following steps: full-process protection pouring, the temperature of the molten steel in the tundish is 1465-1485 DEG C; the current of the electromagnetic stirring of the crystallizer is 330-350 A, and the frequency is 3-4 Hz; the current of the electromagnetic stirring of the secondary cooling end is 340-360 A, and the frequency is 8-9 Hz; the drawing speed of the continuous casting billet is 0.8-1.0 m / min, the solidification is carried out through secondary cooling, and the secondary cooling intensity is 0.2-0.3 L / kg; the center porosity of the obtained continuous casting square billet is not more than 2.0 level, the center shrinkage hole is not more than 1.5 level, and the cross-section size is 197-205*197-205 mm 2 ; the continuous rolling process comprises the following steps: the continuous casting square billet is loaded into a steel rolling heating furnace for heating; the continuous casting billet is discharged into a rough rolling machine after being heated, and the outlet speed of the finished product with a round steel φ70-90 mm specification is 0.90-1.5 m / s; and the round steel with a diameter of 70-90 mm is rolled. The method can produce large-size rod with small compression ratio, expand the production capacity of equipment, and improve the utilization rate under the existing process equipment.

The invention relates to the technical field of water permeable bricks, in particular to a biomass steel slag water permeable brick and a preparation method thereof.The biomass steel slag water permeable brick is prepared from, by weight, 12-18 parts of cement, 70-78 parts of coarse aggregate, 5-10 parts of fine aggregate, 0.3-0.45 part of straw powder and 4-6 parts of water; the preparation method comprises the following steps: (1) mixing the cement, the fine aggregate and the straw powder to obtain a mixture; (2) mixing the mixture obtained in the step (1) with coarse aggregate to obtain a mixture, and adding water into the mixture to obtain mixed slurry; and (3) injecting the mixed slurry obtained in the step (2) into a mold, carrying out vibration compression molding, and curing to obtain the biomass steel slag water permeable brick. The biomass steel slag water permeable brick prepared by the invention is excellent in water permeability and compressive strength.

The invention discloses a method and a tool for measuring the temperature sensing performance of a valve of an air-lubricating oil radiator. The tool comprises a shell, a first positioning block, a slotted cylindrical head screw and a second positioning block. The shell serves as a main body of the tool, the first positioning block and the second positioning block are assembled on the shell through the slotted cylindrical head screws, and the shell is provided with a plurality of observation windows and internal threads. The first positioning block is used for positioning the final position of the valve after the valve assembly is assembled, and the second positioning block is used for positioning the final position of the valve after the valve in the valve assembly moves. The valve assembly is assembled on the tool for a temperature sensing performance test, if the valve is opened or closed in advance, the memory alloy can be debugged through the adjusting gasket, it is guaranteed that the performance of the valve assembly is qualified, and the use requirement of the radiator is met.

The utility model discloses a kind of furnace soot-blowing devices for vertical furnace, including box, the inside of box is provided with guide rod one and guide rod two, guide rod one is equipped with guide sleeve one, guide rod two is equipped with guide sleeve two, and it is connected with blowing pipe between guide sleeve one and guide sleeve two, blowing pipe is equipped with nozzle, nozzle is aligned in the heat exchanger inside the box and is purged, dust produced by purging is collected by the dust collector below and is excluded, and the right side of blowing pipe is communicated with access pipe and internal thread pipe, and internal thread pipe is equipped with screw rod, access pipe is communicated with air pipe joint by hose, and air pipe joint is arranged at the bottom of purging device, the utility model reduces the time of shutdown soot-blowing, saves production cost while ensuring that steel belt performance is qualified.

This invention discloses a method for preparing high-silicon ductile iron castings, belonging to the technical field of high-silicon ductile iron casting preparation, including the following steps: S1: preparing a mold sand mold; S2: preparing casting materials; S3: pouring molten iron-based metal into a treatment bag, and using a spheroidizing agent and antimony alloy for spheroidization treatment to form spheroidized molten metal; S4: transferring the spheroidized molten metal from the treatment bag to a pouring bag, and adding an inoculant equal to the weight of the molten iron-based metal to the pouring bag to form a pouring molten metal; S5: pouring the pouring molten metal into the mold sand mold for molding to form a high-silicon ductile iron casting; through the above method, using silicon solid solution strengthening and antimony-rare earth synergistic spheroidization process, the casting achieves high strength and toughness, and the metallographic structure is mainly ferrite with good structural consistency, meeting the stringent requirements of welded differential housings for new energy vehicles.

This invention relates to the field of welding technology, specifically to a pretreatment method for weldable parts, a composite manufacturing method, and a hot-stamped component. The pretreatment method for the weldable parts includes: before welding the edge of a coated steel plate to be welded, performing a heat treatment to melt the coating on the edge, and immediately extruding away the coating elements from the surface of the edge to be welded, forming a weldable area. This invention uses heat treatment to melt the coating and extrusion to remove the coating elements from the edge to be welded. This invention has high coating removal efficiency, eliminates the need for a pretreatment production line, and eliminates the need for prefabricated specific gaps between weldable edges and special high-alloy welding wire, thereby significantly reducing the cost of tooling fixtures and welding wire and improving welding loading efficiency. Furthermore, it ensures that the weld joint performance is qualified and the quality is stable after heat treatment in mass production.

The present invention discloses a heat treatment method for a P24 steel pipe, comprising performing normalizing treatment and tempering treatment on the P24 steel pipe in sequence, wherein the normalizing treatment comprises: (1) heating the cold P24 steel pipe to the first stage insulation zone at a heating rate lower than 600°C / hour for insulation, and the insulation temperature is 880°C to 940°C; (2) after the first stage insulation is completed, rapidly heating to the insulation temperature of the second stage insulation for insulation, and the insulation temperature is 980°C to 1020°C; the speed of the rapid heating is greater than the heating rate of the first stage insulation step; (3) cooling to room temperature after the second stage insulation is completed. The P24 steel pipe is insulated in a low temperature section above the austenitizing critical temperature to inhibit grain growth; in a high temperature section, it is ensured that a steel pipe with qualified performance is obtained; and a controlled cooling rate technology is used during normalizing to obtain suitable structure and performance at a specific cooling rate.