31results about How to "Stable heating rate" patented technology

The invention discloses a link plate balling and annealing technology which comprises the following steps of: putting a link plate on a tray in an inner barrel of a balling and annealing furnace and closing a furnace cover; heating the inner barrel to the temperature of 720 DEG C at the speed of 5 DEG C per minute; preserving the heat for 5 hours; slowly cooling the inner barrel to the temperature of 650 DEG C, and closing an air inlet valve to stop charging methanol gas; forcibly cooling the inner barrel to the temperature of 500 DEG C in 3 hours; and opening the furnace cover, hoisting the link plate out of the furnace, and cooling the link plate to normal temperature with air. The technology can ensure that the treated workpiece has good cutting performance, low hardness and high deformability, so that the quality and the service performance of the product are improved.

The invention relates to a control method for increasing the blowing end point temperature of a steelmaking converter. Firstly, the addition amount of steel scrap cold material and the type and quantity of the first batch of blowing material are determined. At the end of the oxidation period of silicon and manganese, the alkalinity of steel slag The range is 1.1-1.8, the MgO content in the slag is 4.0%-6.5%, the TFe content is 15%-23%, and the molten iron temperature is 1385-1425°C; Calcium and magnesium-containing slagging material and iron-containing oxide cold material; steel slag alkalinity ranges from 2.7 to 3.4, MgO content in slag is 7.5% to 10.5%, TFe content is 13% to 19%; gun operation. The method ensures that the slagging reaction in the whole process of converter blowing is compatible with the reaction process of molten iron, stabilizes the heat dissipation coefficient and the temperature rise rate in the process of converter blowing, and improves the temperature control capability at the end point of steelmaking converter blowing.

The invention belongs to the steel technical field, and specifically, relates to a vanadium-nitrogen microalloyed high-strength phase-transformation induced plastic steel seamless pipe and a preparation method thereof. The vanadium-nitrogen microalloyed high-strength phase-transformation induced plastic steel seamless pipe comprises the chemical ingredients by the weight percentage: 0.18%-0.24% of C, 1.0%-1.6% of Si, 1.2%-1.6% of Mn, 0.17%-0.22% of V, 0.01%-0.03% of N, not more than 0.06% of P, not more than 0.005% of S, and the balance iron and unavoidable impurities. With utilization of an intermediate-frequency induction heat treatment device of a thin-wall steel pipe and with supplementary of a vanadium-nitrogen microalloyed component design, the advantage of cooperation of good strength and elongation of phase-transformation induced plastic steel is successfully applied to the steel pipe production field, a fact of replacing solid components with hollow components is effectively realized so as to achieve automobile light weighting, besides, further development of an internal high pressure forming technology is promoted, not only are the internal high pressure formed components with high strength, large deformation and complex shape produced, but also the production cost is greatly reduced, and the preparation method has wide application prospects are provided.

The invention provides a device for synthesizing aluminum sulfate. The device comprises a first water inlet pipe, a second water inlet pipe, a low-pressure steam pipe, an aluminum powder feeding pipe, a concentrated sulfuric acid feeding pipe, a condensed water pipe, a hot water storage tank, a reactor, a slag cutting pot, an intermediate storage tank, a precision filter and an aluminum sulfate storage tank, wherein the hot water storage tank, the reactor, the slag cutting pot, the intermediate storage tank, the precision filter and the aluminum sulfate storage tank are connected in sequence; a coiled pipe is arranged on the inner wall of the reactor; an inlet and an outlet of the coiled pipe are formed in the outer wall of the reactor; one end of the low-pressure steam pipe is connected with the inlet of the coiled pipe; one end of the condensed water pipe is connected with the outlet of the coiled pipe; one end of the hot water storage tank is connected with the inlet of the coiled pipe, and the other end of the hot water storage tank is connected with the first water inlet pipe; and one end of the second water inlet pipe is connected with the outlet of the coiled pipe. The invention further provides a method for synthesizing aluminum sulfate by using the device. The device and the method provided by the invention have the advantages of operation stability and security and high conversion rate of raw materials. By adopting the device and the method, the loss of sulfuric acid and steam can be reduced greatly, and the pollution to air can be alleviated significantly, and the energy consumption of the device is reduced.

The invention provides a method for preparing an electrode of ZIF-derived CoMoO4. the method is characterized in that the method uses a high temperature calcined ZIF-67 as a precursor to prepare CoMoO4 by hydrothermal method., that steps are as follow: (1) molybdate and a compound containing a Co salt are taken and stirred in deionized water until the molybdate and the compound contain the Co saltare dissolved; (2) a small amount of ZIF-67 power are added, stirred to a homogeneou solution; 3, that mixture is transferred to a reaction kettle, and the mixture is cooled to room temperature afterreaction for 2h; (4) alternately cleaning and drying are performed for 24h; (5) Ultrasonic cleaning is performed for 30 min, deionized water cleaning and ultrasonic are performed, drying is performedfor 12 h; 6) that graphite paper is dried at constant temperature, the required material is ground in a mortar, a small amount of solvent is added, uniformly dropping on the dried sheet layer, and then drying is performed, and 7) a regular-shaped electrode of ZIF-derived CoMoO4 is performed. The invention overcomes the problems of poor stability and small specific capacitance of metal oxide electrode in the prior art, and provides a preparation method of CoMoO4 derived from metal oxide electrode material ZIF with high specific capacity and good stability.

The invention discloses a high-strength plastic vanadium microalloyed dual-phase steel seamless pipe and an on-line preparation method thereof. The seamless pipe is composed of the following chemical components in percentage by mass: 0.10-0.18% of C, 0.1-0.6% of Si, 1.1-1.6% of Mn, 0.16-0.20% of V, 0.01-0.03% of N, at most 0.006% of P, at most 0.005% of S, and the balance of Fe and other inevitable impurities. The intermediate-frequency induction heat treatment device of the thin-wall steel pipe is utilized and assisted by the vanadium microalloyed component design to produce the dual-phase steel seamless pipe with favorable comprehensive mechanical properties; the advantages of low yield-tensile ratio, high rate of work hardening, favorable strength and favorable elongation percentage of the dual-phase steel are matched and successfully applied to the field of production of steel pipes to efficiently substitute solid components with hollow components, thereby implementing light weight of the automobile; and meanwhile, the seamless pipe promotes further development of the internal high-pressure forming technique, and has wide application prospects.