The invention relates to a hot loading method for medium-thick slabs The method includes: cutting the medium-thick slabs into specific lengths, conveying for rolling, using a traveling vehicle to hang high-temperature slabs to a slow cooling stacking position, placing normal-temperature medium-thick slabs on the high-temperature slabs, stacking in a way that a normal-temperature medium-thick slab is placed between two high-temperature slabs and the topmost piece of each stack is a high-temperature slab for 10-14 hours until each high-temperature slab is cooled to the required uppermost limit of hot loading and each normal-temperature medium-thick slab is preheated to the required lowermost limit of hot loading, and loading the slabs into a heating furnace Normal-temperature medium-thick slabs are preheated by heat released by high-temperature slabs during slow cooling to reach a surface temperature of more than 400-550 DEG C so as to achieve hot loading Waste heat of the high-temperature slabs are utilized to the maximum limit and fine energy conservation effect is achieved A novel method for preheating normal-temperature slabs outside the furnace is created, and fracture of the slabs due to normal-temperature slabs are heated in the heating furnace can be avoided

Hot loading method for medium-thick slabs

The invention belongs to the technical field of metallurgy and particularly relates to a low-grade non-oriented electrical steel cold-charging furnace and a heating preparation method forelectrical steel The heating method for the cold-charging electrical steel comprises the following steps of a, after making and casting steel into plate billets, and waiting to charge into the furnace by adopting a stacking mode; b, controlling heating temperatures and time at various stages; and c, controlling the tapping interval and the tapping temperature of the plate billets According to the heating method disclosed by the invention, on the basis of the characteristics of an internal organizational structure of the cold-charging non-oriented electrical steel, a proper heating technique is formulated, the temperature at the earlier stage of temperature rise is reduced, the low-temperature heating time is prolonged, and the condition that the temperature difference between inside and outside of the cold-charging electrical steel is locatedwithin a controllable range is guaranteed; in addition, by adopting silicon contents as differentiating factors, different temperature rise speeds and time of various heating stages are formulated according to the difference of the silicon contents, the condition that the temperature raising speed is locatedwithin the controllable range is guaranteed, and the generation of stress is reduced; and meanwhile, high maneuverability is realized, and the rejection judgement of the non-oriented electrical steel caused by excessively-low temperature of casting blanks can be reduced

Heating method for cold-charging electrical steel

The invention discloses a medium plate surface longitudinal edge crack control method and belongs to the technical field of steel rolling. According to the medium plate surface longitudinal edge crack control method, the medium plate surface longitudinal edge cracks are controlled through heating and rolling technologies, namely through control of heating uniformity; opening degrees of an upper burner and a lower burner of a heating furnace are regulated to control gas flow; the gas flow of the upper burner and the lower burner is controlled according to a ratio of 1:2 to 1:7; the steel billet tapping upper surface and lower surface temperature difference is guaranteed within +/- 20 DEG C and accordingly inhomogeneous deformation of the upper surface and the lower surface of the steel blank during rolling is reduced; the steel billet tapping temperature is controlled between a range of 1160 to 1220 DEG C; a rolling mill sled plate coefficient SKI value during a rolling widening process is adjusted and the SKI coefficient is set to be between +4 to +8, so that the roller lowering speed of the rolling machine is improved and a plate shape at the widening stage is slightly warped. The medium plate surface longitudinal edge crack control method has the advantages of saving costs and improving the logistics turnover speed compared with the steel billet angle cutting method due to the fact that the longitudinal edge cracks are controlled by methods of controlling the heating uniformity and widening the plate shape.

Medium plate surface longitudinal edge crack control method

The invention relates to a high-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method and belongs to the technical field of continuous casting sheet billets. The high-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method comprises the specific steps and parameters that the surface temperature after high-carbon-equivalent sheet billets are discharged from a production line is 850-900 DEG C; the stack bottom, top and periphery of a high-carbon-equivalent sheet billet stack are fenced by hot billets, and the surface temperature of the hot billets on the stack bottom, top and periphery is 300-600 DEG C; the distance between a peripheral hot billet stack and the high-carbon-equivalent sheet billet stack is controlled to 1.5-2.0 m; the stacking height of the high-carbon-equivalent sheet billets is smaller than or equal to 2 m, the sum of the stacking heights of the high-carbon-equivalent sheet billets, the stack bottom hot billets and the stack top hot billets is smaller than or equal to 2.5 m, and the height of the peripheral hot billet stack is not smaller than the sum of the sum of the stacking heights of the high-carbon-equivalent sheet billets, the stack bottom hot billets and the stack top hot billets; and the stacking and slow-cooling time is 120-240 hours. After the slow-cooling time reaches 96 hours, the surface temperatures of the high-carbon-equivalent sheet billets and the surface temperature of the peripheral hot billets are measured and are below 300 DEG C for 48 hours continuously, and then unstacking is conducted. The method has the advantages that low-cost production is achieved, the sheet billet breaking risk is reduced, and the development requirements of high-carbon-equivalent sheet billet products are met.

High-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method

The invention relates to a method for reducing horizontal edge cracks of a high-strength and low-alloy steel plate. The method comprises the following steps that (1) before a plate blank is installed in a stove, the corners of opposite sides of a flap of the plate blank are cleaned, micro-cracks on the corners of the plate blank are cleaned, and the problem that in the rolling process, the steel plate deform, the cracks diffuse, and therefore horizontal edge cracks appear in the steel plate; (2) when the steel plate is heated, the time of a soaking period is controlled to be within 60-150min, the soaking temperature is controlled to be within 1200-1300DEG C, and the tapping temperature and the temperature of the steel plate after the steel plate is out of the stove are uniform; (3) the compression ratio is controlled to be within 5-50, the proportional spread is controlled to be within 1-2.5; rough rolling is conducted on the steel plate is after the steel plate is out of the stove, and the pass reduction of rough rolling and cross rolling is 25-35%. The method has the advantages of being capable of effectively avoiding a horizontal crack zone of the steel plate, ensures that the unqualified rate of edge-fault steel plates is reduced below 0.01%, greatly improves the edge quality of the steel plate and reduces the edge-cutting amount.

Method for reducing horizontal edge cracks of high-strength and low-alloy steel plate

The invention relates to a method for controlling the hot-conveying charging temperature of casting blanks accurately, and belongs to the technical field of steel making-steel rolling. The method comprises the following processes of: spruing, fan-shaped section discharging, primary cutting, secondary cutting, hoisting, stacking, temperature measuring and charging; the temperature of the casting blanks discharged from a fan-shaped section is between 870 and 900 DEG C by adjusting the controlled technical parameters such as the secondary cooling water distribution and pulling rate of a casting machine; compact stacking is adopted to ensure the uniform cooling of billet steel, namely the billet steel which needs to be subjected to slow cooling is put in the center of stacks, 6 to 10 pieces of billet steel are stacked on each stack, the periphery is enclosed by using one stack of billet steel, 6 to 12 pieces of billet steel are stacked on each stack at the periphery, the distance between the billet steel at the periphery and the billet steel which needs to be subjected to the slow cooling is between 1.2 and 2 meters, and the stacks are not disassembled before stack cooling; the billet steel with 220-millimeter thickness is subjected to the stack cooling for 8 to 10 hours, the billet steel with 250-millimeter thickness is subjected to the stack cooling for 12 to 16 hour, and the billet steel with 320-millimeter thickness is subjected to the stack cooling for 20 to 24 hours; and the temperature of the billet steel is measured before the billet steel is added into a heating furnace to ensure that the hot-conveying charging temperature of the billet steel is controlled to be between 450 and 600 DEG C stably. The method has the advantage of reducing the incidence of surface cracks of hot-conveying steel plates.

Method for controlling hot-conveying charging temperature of casting blanks accurately

The invention relates to a method for effectively controlling the horizontal-edge crack of a medium-thickness plate, which belongs to the technical field of steel making-steel rolling The controlled process parameters are as follows: in the continuous-casting process, the accuracy of a roll gap of a base arc at the sector-shaped section of a continuous casting machine is controlled within the range from -05mm to 05mm; for guaranteeing that the casting of the casting machine is protected, the nitrogen adding amount is controlled to be below 5ppm; and the width size deviation of a steel blank is controlled between minus 10mm and 15mm In the steel-rolling process, the discharging temperature of the steel blank is controlled between 1160 DEG C and 1300 DEG C; for comparison of the width of the rolled steel plate and the steel blank, the spreading ratio is between 115 and 21, the trimming amounts corresponding to different spreading ratios are different, and the trimming allowance of a single edge is controlled between 38mm and 63mm; and for comparison of the thickness of the steel blank and the thickness of the steel plate, the compression ratio is more than 5-25 The method has the advantages that the occurrence rate of the horizontal-edge crack of the medium-thickness plate in the production process can be effectively controlled to be below 03%

Method for effectively controlling horizontal-edge crack of medium-thickness plate

Method for inspecting fracture defects of reconnected billets

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Method for controlling hot-conveying charging temperature of casting blanks accurately

Method for effectively controlling horizontal-edge crack of medium-thickness plate

Method for inspecting fracture defects of reconnected billets