Abstract: The disclosure provides a method for heat-treating a boron steel, which includes: carburizing a boron steel on a surface thereof to obtain a carburized boron steel; austenitizing the carburized boron steel at a temperature of 885-895° C. for 25-35 min, to obtain an austenitized boron steel; sequentially subjecting the austenitized boron steel to an oil quenching and a tempering, wherein the oil quenching is performed at a temperature of 55-65° C. for 29-31 min.

Abstract: The present disclosure provides a halogen-free inorganic flame retardant material and a preparation method and an application thereof, belonging to the technical field of inorganic liquid flame retardants. The halogen-free inorganic flame retardant material of the present disclosure is prepared by mixing raw materials comprising the following components: an aluminum sulfate aqueous solution, a saturated ferric sulfate aqueous solution and a sodium metasilicate aqueous solution at a volume ratio of 2.5:2.5:1˜2:3:1; the sodium metasilicate aqueous solution and the aluminum sulfate aqueous solution independently has a molar concentration of 0.09˜0.11 mol/L; and the saturated ferric sulfate aqueous solution is a saturated aqueous solution at 15˜17° C.

Abstract: A pressure control system and means for pressure pouring of cast steel wheels, including a control system and a main gas circuit. The control system includes an upper computer, a PLC unit, a sensor, an operation box and an electronic valve. The upper computer is connected via a signal line with the PLC unit which is connected with each of the sensor, the operation box and the electronic valve. The sensor includes an inside-tank pressure sensor and an inside-mold liquid level detecting sensor. The electronic valve includes a quick breaking valve and a servo valve. The main gas circuit includes a gas pressure bag, a ball valve, a pressure reducing valve, a solenoid valve, and a pressure tank. The gas pressure bag, the ball valve, the pressure reducing valve, the solenoid valve and the pressure tank are connected with one another via gas tubes.

Abstract: A gas pressure tank structure including: a tank wall, a compression oil cylinder, a locking ring, a spring cylinder, a locating pin mounting hole, a dowel pinhole, a refractory brick, a guide mechanism, a sealing structure, an arc joint, an arc shaped tank bottom, a steel ladle stand, a tank cover, and a reinforcing board.

Abstract: A locking mechanism for a tank body and a tank cover of a pressure tank. The locking mechanism includes: a tank body, a tank chamber, a tank cover, a hydraulic cylinder, a locking ring, a spring cylinder, a fixing supporting mechanism, a fixing plate, a barb, a notch, and a pulling cylinder.

Abstract: A pressure control system and means for pressure pouring of cast steel wheels, comprising a control system and a main gas circuit. The control system comprises an upper computer, a PLC unit, a sensor, an operation box and an electronic valve. The upper computer is connected via a signal line with the PLC unit which is connected with each of the sensor, the operation box and the electronic valve. The sensor comprises an inside-tank pressure sensor and an inside-mold liquid level detecting sensor. The electronic valve comprises a quick breaking valve and a servo valve. The main gas circuit comprises a gas pressure bag, a ball valve, a pressure reducing valve, a solenoid valve, and a pressure tank. The gas pressure bag, the ball valve, the pressure reducing valve, the solenoid valve and the pressure tank are connected with one another via gas tubes.

Abstract: A locking mechanism for a tank body and a tank cover of a pressure tank. The locking mechanism includes: a tank body, a tank chamber, a tank cover, a hydraulic cylinder, a locking ring, a spring cylinder, a fixing supporting mechanism, a fixing plate, a barb, a notch, and a pulling cylinder.

Abstract: A gas pressure tank structure including: a tank wall, a compression oil cylinder, a locking ring, a spring cylinder, a locating pin mounting hole, a dowel pinhole, a refractory brick, a guide mechanism, a sealing structure, an arc joint, an arc shaped tank bottom, a steel ladle stand, a tank cover, and a reinforcing board.