Method for eliminating macro C segregation by performing heat preservation on continuously cast steel billets

Method for eliminating macro C segregation by performing heat preservation on continuously cast steel billets

The invention belongs to the field of metallurgy and in particular relates to a method for eliminating macro C segregation by performing heat preservation on continuously cast steel billets. The method particularly comprises the following steps of: 1.1 determining the heat-preserving temperature of steel grade; 1.2 determining the solid phase change (alpha to gamma) temperature T2 in the heating state of the steel grade according to a Fe-C phase diagram; and 1.3 performing heat preservation on the continuously cast steel billets in a heating furnace at the temperature of 20 DEG C less than the temperature T2 for 40 hours; heating to temperature T1 and preserving heat for 40 hours; and after heat is preserved, cooling along with the furnace. According to thermodynamic calculation, organizational analysis and laboratory experiments, a heat-preserving method is provided, so diffusion homogenization efficiency of C can be efficiently improved. The equipment is readily available and the method ...

Measuring device and method of crystallization temperature of crystallizer slag powder

The invention relates to a measuring method for the crystallization temperature of crystallizer slag powder in the field of metallurgy, which is a simple and practical technology for measuring the crystallization temperature of slag powder. In the measuring device, a conductance method is adopted for measuring the crystallization temperature, and the measuring device is composed of a direct-current power supply U0, conductivity electrodes, a resistance furnace, a thermocouple, a digital-to-analog convertor, a data collector, a voltmeter and a protection resistor R0, wherein the temperature values of voltage and slag powder between two conductivity electrodes are synchronously collected by an external computer, and a corresponding relation schema is made, thus the crystallization temperature of the corresponding slag powder is obtained from the schema. Compared with the measuring method for the crystallization temperature of crystallizer slag powder, such as a differential thermal analysis ...

Alloy for molten steel desulfurization and method for using alloy in RH (ruhrstal heraeus) refining process

The invention relates to alloy for molten steel desulfurization. The alloy is prepared from the following components in percentage by mass: 40-50 percent of Al, 10-30 percent of Ca, less than or equal to 1.0 percent of Si, less than or equal to 0.045 percent of S, less than or equal to 0.045 percent of P, less than or equal to 0.1 percent of C, and the balance of Fe. The invention also relates to an RH (ruhrstal heraeus) refining method by utilizing the alloy for molten steel desulfurization. According to the alloy, the problems in the prior art that a desulfurizing agent is strong in dip pipe corrosion and low in desulfurization efficiency, and great recarburization is caused when ultra-low carbon molten steel is refined can be solved.

Method for producing pipeline steel

The invention discloses a method for producing pipeline steel. The method comprises the steps that pretreatment is performed on molten iron, and pretreatment at least comprises desulfurization treatment and dephosphorization treatment on the molten iron; blowing is performed on the pretreated molten iron to acquire molten steel; according to the phosphorus content in the blown molten steel, a steel tapping technology corresponding to the phosphorus content is selected to perform steel tapping treatment on the molten steel; the pipeline steel is acquired through the molten steel. According to the method for producing the pipeline steel, the problem how to provide a brand new method for producing the pipeline steel in the prior art so that the produced pipeline steel can have the high purity degree and can also overcome the technical defect that the usage requirement of the pipeline steel is low due to the fact that a microcrack is generated on the periphery of inclusion is solved.

Steel and preparation method thereof

The invention relates to steel and a preparation method thereof, and belongs to the technical field of steel preparation. Rolling and coiling the casting blank to obtain a plate coil; the plate coil is subjected to acid pickling, and an acid-pickled plate is obtained; performing first annealing on the pickled plate according to a first annealing parameter to obtain a first annealed plate; performing cold rolling on the first annealed plate according to a set reduction rate to obtain a cold-rolled plate; controlling the cold-rolled sheet to perform second annealing according to a second annealing parameter to obtain steel; the process of annealing-rolling-annealing is adopted, under the condition of the set reduction rate, mechanical energy storage and a carbon diffusion channel can be provided, the spheroidization rate of steel is increased, and then low hardness and high elongation of the steel are achieved.