68results about How to "Reduce quality objections" patented technology

The present invention discloses a slab-yard tracking and management system which comprises a continuous casting machine controller which outputs slab offline storage information, a slab management controller which receives the slab offline storage information and outputs a storage operation command, a track controller which receives the storage operation command and controls the a roller to transport a slab to a bridge crane operation position, and a bridge crane controller which receives the storage operation command and controls the bridge crane to lift the slab to a stack position to get down. The slab-yard tracking and management system has the advantages that a daily artificial inventory making problem is completely solved, the accuracy and real-time performance of the slab information in a warehouse are fundamentally ensured, and the system has an important meaning for improving product quality and reducing quality objection.

The invention discloses a method of manual accelerated simulation of natural aging of a rapid cooling steel plate. The method comprises a controlled rolling and controlled cooling process, wherein in the controlled rolling and controlled cooling process, the heating temperature is 1150-1250 DEG C, the finish rolling temperature is 810-870 DEG C, the cooling speed is 10-30 DEG C / s, the red-returning temperature is 540-600 DEG C, and the straightening temperature is 520-580 DEG C. The method further comprises an orthogonal control process of manual accelerated simulation of natural aging. The orthogonal control process specifically comprises the following steps: setting the heating temperature at 150-200 DEG C, setting the insulating time of 0.5-5 hours and controlling the cooling speed at less than or equal to 1 DEG C / s. The control method disclosed by the invention can simulate the performance change of the steel plate after natural aging. The trend obtained after implementation is consistent with the change trend of the natural aging performance, so that the method can be used for quickly detecting the aging performance change of the steel plate without affecting the rhythm of production, but also facilitates smoothness of supply of materials.

The invention provides an optimal control system of the shape and the thickness of a steel plate, comprising a rolling mill one-stage control and a rolling mill two-stage control for providing a rolling schedule for the rolling mill one-stage control, wherein the rolling mill one-stage control comprises an automatic roll gap control, a data processing module connected with the automatic roll gap control, a finishing pass flattening module for optimizing the plate shape control, a semi-automatic swing roll gap module which is connected with the automatic roll gap control and used for optimizing the plate thickness control and an automatic roll gap control weight and limit value interfering module for adjusting the automatic roll gap control compensation quantity and controlling the limit. By means of the technical scheme of the invention, on the premise that the thickness accuracy is guaranteed, the shape of the heavy-gauge steel plate is improved and particularly the problem of small breaker is greatly improved; meanwhile, the subsequent flattening and cold straightening processes are reduced, the process cost is saved and the economic benefit is considerable; and the quality discrepancy caused by the flatness is reduced and the customer cognition degree is increased.

The invention provides a coil data tracking method for a continuous hot-rolled slitting machine to solve the problems in the prior art that the material flow is not matched with the information flow, the labor intensity of operation personnel is large and the like, and the method can alleviate the labor intensity of the operation personnel and can improve the information accuracy. The method comprises the following steps that: a mother coil number of a current mother coil is read by an uncoiler from a previously stored plan table; a plurality of small coil numbers are generated according to the read mother coil number and the quantity of small coils to be divided by the current mother coil, and the generated small coil numbers are stored in a temporary table; when a small coil completion signal which is 1 is received by a coiler, the small coiler number of a current small coil is read by the coiler from the temporary table to be written into a label of the current small coil; an electronic scale weighs the current small coil, and the measured weight is written into the label of the current small coil; when a mother coil completion signal is not 1, data tracking is executed for a next small coil; and if the mother coil completion signal is 1, data tracking is executed for a next mother coil.

The invention relates to a method for producing a hot-rolled steel coil, which comprises the following steps of: 1) designing components, pretreating molten iron, smelting in a converter, switching nitrogen and argon, and tapping to obtain molten steel; 2) performing continuous casting on the molten steel to obtain a plate blank, wherein the content of the molten steel in a continuously cast intermediate ladle is controlled to be between 8 and 15t and the liquid level is controlled to be between 200 and 350mm when the intermediate ladle is not poured; and pouring is protected in the whole process, and the insertion depth of a long nozzle is between 300 and 400mm; 3) heating the plate blank; and 4) rolling and curling the heated plate blank. By the method, the content of C and Mn in the components of Q235q-D steel is reduced, the comprehensive performance of the Q235q-D steel is improved by appropriate rolling process and controlled cooling process, and a low-cost and high-performance Q235q-D hot-rolled steel coil is produced.

The invention relates to a rolling process of Ti-containing low alloy steel. The steel comprises the following components in percent by mass: 0.13-0.15% of C, 0.20-0.40% of Si, 0.70-0.90% of Mn, lessthan or equal to 0.020% of P, less than or equal to 0.020% of S, 0.003-0.020% of Al, 0.045-0.065% of Ti, less than or equal to 0.30% of CEV and the balance Fe and inevitable impurity elements. The rolling process comprises the following steps of S1, producing a proper slab in a steelmaking step; S2, directly heating the slab in the step 1 at a high temperature; S3, roughly rolling the slab heatedat the high temperature in the step 2; S4, carrying out finish rolling on the roughly rolled slab in the step 3; S5, carrying out ultra fast cooling on the slab after finish rolling in the step 4; andS6, cooling the slab to 800-820 DEG C in the step 5 and carrying out air cooling on the slab. The rolling process overcomes the defects in the prior art and meets the demand of steel rolling production of a low cost low alloy steel plate.

The invention relates to a control method of eliminating yield point elongation at the front part and the rear part of a weld joint of cold-rolled strip steel and belongs to the technical field of cold-rolled strip steel production control. According to the technical scheme, the control method comprises the following steps: when the strip steel is continuously produced, an operator determines the minimum scrap cutting knife number at a strip tail and the minimum scrap cutting knife number at a strip head according to the following formula in light of speed of the weld joint passing through a temper mill, and then the operator sets the minimum scrap cutting knife number at the strip tail and the minimum scrap cutting knife number at the strip head at an outlet for roll dividing: Y1 is greater than or equal to ROUNDUP{(0.58595+0.01384*X) / 0.45, 0}; Y2 is greater than or equal to ROUNDUP{(5.48925-0.04198*X+0.000346*X<2>) / 0.45, 0}, wherein Y1 is the minimum scrap cutting knife number at the strip tail, Y2 is the minimum scrap cutting knife number at the strip head and X is the speed of the weld joint passing through the temper mill, the unit of the speed is m / min; 0.45 is the length of scrap cut at the outlet every time and the unit is m. The control method provided by the invention has the beneficial effects that the control method is simple; the operator sets the speed of the weld joint passing through the temper mill according to rhythm of production and sets the corresponding minimum scrap cutting knife numbers at the front part and the rear part of the weld joint at the outlet, so that objection about quality caused by defects of fish scales as the head and tail are not thoroughly cut off is reduced while the product quality is guaranteed, and meanwhile, the production efficiency is increased.

The invention provides a control method for macular corrosion of a cold rolling pickling machine set. The control method comprises the following steps: first, determining possible reasons for formation of the macular corrosion, and then controlling the formation of the macular corrosion according to the possible reasons for the formation of the macular corrosion, wherein the possible reasons for the formation of the macular corrosion comprises the following seven types: the macular corrosion formed in a low-speed process of a process stage, the macular corrosion formed by over-high concentration of residual C1 on the surface of band steel, the macular corrosion formed by excessive temperature difference between a water temperature and an acid temperature in a bleaching stage, the macular corrosion formed by accidental shutdown or slow speed, the macular corrosion formed by low pressure of a squeezing roller and low temperature of a drying machine in the process stage, the macular corrosion formed by instability of voltage of an electrostatic oiler, and the macular corrosion formed by high humidity in a working field. By utilizing the control method for the macular corrosion of the cold rolling pickling machine set, the problems of great loss and the like caused by the defect of the macular corrosion of the band steel can be solved.

The invention relates to a method for producing hot-rolled steel coils. The method comprises the following steps of: 1) designing components, pre-treating molten iron, smelting in a converter with nitrogen and argon switching, and tapping to obtain molten steel; 2) performing continuous casting on the molten steel to obtain a plate blank, wherein when pouring of a continuously cast intermediate ladle is stopped, the molten steel quantity of the intermediate ladle is controlled at 8 to 15 tons, the liquid level is 200 to 350 millimeters, full-process protective pouring is adopted, and the inserting depth of a long nozzle is 300 to 400 millimeters; 3) heating the plate blank; and 4) rolling the heated plate blank, and coiling. A thermo-mechanical control process + remote position control (TMCP+RPC) rolling process is adopted in the method; by using micro niobium treatment, the content of C and the content of Mn are greatly reduced, and the production cost is reduced; the obtained Q345q-C hot-rolled steel coils have good plasticity and toughness, and the elongation of the steel coils can be improved by over 8 percent; and meanwhile, the welding property of the steel coils is improved, and good surface quality of a continuously cast bloom is ensured.

The invention relates to a control method for improving the surface quality of hot rolled variety steel and belongs to the field of steel rolling. The control method comprises the steps of: firstly judging whether the material code of hot rolled variety steel fed by a secondary computer is equal to that of easily corroded variety steel or not; if so, closing cooling water for a G roller bed when a finish rolling final stand load is turned on; opening cooling water for the G roller bed when the finish rolling final stand load is turned off; closing cooling water for a pinch roll, a wrapper roller and coiling block equipment when a signal that the head of strip steel reaches a heat inspection window in front of a coiling machine is switched on; and opening cooling water for the pinch roll, the wrapper roller and the coiling block equipment when a signal that the tail of strip steel reaches the heat inspection window in front of a coiling machine is switched on. According to the control method provided by the invention, the surface corrosion of an inner layer of a steel coil of variety steel is avoided, the surface quality of a finished product is improved, the percent of pass of the steel coil is improved, the objection of customer quality is reduced, and a good benefit is gained.

The invention relates to a method for producing hot rolled steel coils. The method comprises the following steps: 1) designing the components, pretreating molten iron, then carrying out converter smelting, carrying out nitrogen / argon changing over and carrying out tapping to obtain molten steel; 2) continuously casting the molten steel to obtain slabs, controlling the weight of the molten steel in the tundish to be 8-15t when casting of the continuous casting tundish is stopped, ensuring the liquid level to be 200-350mm; carrying out protective casting in the whole course and ensuring the insertion depth of the long nozzle to be 300-400mm; 3) heating the slabs; and 4) finally rolling and curling the heated slabs, thus obtaining the hot rolled steel coils. The method has the following beneficial effects: the TMCP (thermo-mechanical control process)+RPC (relaxation-precipitation-controlling phase transformation) rolling processes are adopted and the contents of C and Mn are substantially reduced by utilizing micro-niobium treatment, thus reducing the production cost; and the Q345R hot rolled steel coils obtained by the method have excellent plasticity and toughness, the elongation of the hot rolled steel coils is improved by more than 8%, and at the same time, the welding property of the materials is improved and good surface quality of the continuous casting slabs is ensured.

The invention relates to a low-cost and high-performance SPA-H hot rolled steel coil and a preparation method thereof. The low-cost and high-performance SPA-H hot rolled steel coil comprises, by mass, 0.07%-0.095% of C, 0.25%-0.35% of Si, 0.38%-0.48% of Mn, 0.085%-0.105% of P, 0.007% of S or the less, 0.25%-0.35% of Cu, 0.08%-0.20% of Ni, 0.50%-0.60% of Cr, 0.015%-0.045% of Als and the balance Fe and inevitable impurities. The preparation method comprises the steps of composition design, hot metal pretreatment, converter smelting, ladle furnace treatment, continuous casting, hot continuous rolling, laminar cooling and reeling, and the SPA-H hot rolled steel coil is obtained. The SPA-H hot rolled steel coil has excellent plasticity and toughness, cold processing performance is improved, the problem of bending cracking of large deformation in the using process of the SPA-H steel coil is avoided, quality objections are reduced, and comprehensive performance of SPA-H steel is improved.

The invention discloses axle shaft steel for a railway vehicle and a production method of the axle shaft steel. The axle shaft steel comprises, by weight percentage, 0.33-0.38% of C, 0.15-0.40% of Si,0.90-1.05% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.030-0.050% of V, 0.015-0.035% of Als, 0.0040-0.0090% of N and the balance iron and inevitable impurity elements, wherein the adding amount of RE in molten steel ranges from 0.020% to 0.050%. A production process of the axle shaft steel comprises the steps of smelting, LF and RH refining, protected pouring, pressure machining, rough machining, heat treatment, finish machining and inspection and warehousing. By means of the method, the defects that the surface magnetic mark rejection rate of existing axleshafts is high, and the lateral impact energy is low can be overcome; surface magnetic mark rejects of the railway vehicle axle shafts can be obviously reduced; comprehensive mechanical performance ofthe axle shaft steels is improved, in particular, the lateral impact energy is increased, and the lateral impact energy guarantee value is greater than or equal to 40 J; and thus, use safety of the axle shafts can be improved.

The invention discloses a concave press die and a sizing machine. The concave press die and the sizing machine are applied to pressure sizing of a hot rolled steel plate blank. The surface of the side, facing the hot rolled steel plate blank, of the concave press die is provided with a forming groove; the two ends of the forming groove are respectively open at the two end surfaces of the concave press die in the rolling direction of the hot rolled steel plate blank; and the notch width of the forming groove is larger than the thickness of the hot rolled steel plate blank; and the groove bottomwidth of the forming groove is smaller than the thickness of the hot rolled steel plate blank. The concave press die and the sizing machine effectively solve the defect of black lines at the edges ofhot-rolled steel plates, improve the surface quality and the yield of the hot-rolled steel plates, and eliminate the quality objection of users.

The invention discloses a movable device displacement measurement method as well as a rough mill and a gate footstep shear using the same. According to the measurement method, a stay wire coder and aPLC system are provided; the stay wire coder is installed at the fixed end of a movable device; a stay wire of the stay wire coder is fixed to the movable end of the movable device so that the stay wire moves with the movable end; when the stay wire moves with the movable end, the stay wire coder is used for generating signal changes; a signal template of the PLC system is used for acquiring the variation of signals; and displacement changes of the movable end are obtained by calculation. The method effectively overcomes position measurement errors caused by mechanical clearances. After usingthe method, the rough mill can realize precise measurement of the width of a side guide plate, reduces the phenomenon of cambering generated in a rolling process and improves the product quality. After using the method, the gate footstep shear improves the width measurement precision of a steel plate.

The invention discloses a high-precision prediction method for the average temperature of intermediate billets of wide and thick plates, and relates to the technical field of steel production. Based on a temperature partial differential equation, an implicit finite difference method is adopted to establish a temperature solving equation set of the wide and thick plates, and temperature fields in the temperature waiting process of the intermediate billets with different thicknesses are calculated; temperature distribution in the thickness direction under the condition of stable temperature is obtained, and then the difference value between the surface temperature and the average temperature is obtained; due to the fact that the mechanism model is adopted to calculate the temperature field, the temperature calculation precision can be guaranteed, meanwhile, regression processing is carried out on the calculation result, the average temperature of the steel billet can be rapidly calculated according to the surface temperature value of the steel billet, and the engineering application requirement is met.

The invention relates to an operation method and a device for billet casting and mark spraying through a mechanical arm type automatic mark spraying device, and belongs to the technical field of steelmaking continuous casting billet production. According to the technical scheme, by modifying a PLC program, all flow casting billet in-place manual buttons are added to a computer picture, program linkage is added, input setting of digital signals is achieved, and two schemes of a touch type automatic mode and an on-site confirmation manual mode are connected. The operation method and the device for billet casting and mark spraying through the mechanical arm type automatic mark spraying device have the beneficial effects that a manual mark spraying signal device is additionally arranged on the picture of a mechanical arm type automatic mark spraying robot, continuous mark spraying of the mark spraying robot is guaranteed under the abnormal state of equipment, the use operation rate is improved, and the mark mixing accident of take-out billets is avoided to the maximum extent.

The invention relates to a high-credibility steel hanging identification method and system based on blockchain evidence storage verification. The method comprises the steps that a blockchain platform,a warehouse information system and a steel sales platform are constructed and accessed to the blockchain platform; after the steel enters the warehouse, the warehouse information system acquires thesteel information of each operation link in real time, and uploads the steel information of the key operation link to the block chain platform for evidence storage to generate evidence storage information; the steel sales platform receives a merchant hanging request and sends a verification request to the blockchain platform; the block chain platform verifies the evidence storage information of the to-be-mounted steel, determines whether the to-be-mounted steel is high-credibility steel or not, generates a verification result and returns the verification result to the steel sales platform; andthe steel sales platform receives the verification result, and if the steel is high-credibility steel, a reputation identifier is added to the hung steel. Compared with the prior art, higher credit endorsement is provided for high-quality steel resources, the credibility of steel resource information is ensured, the communication cost in the transaction process is reduced, and the transaction efficiency is improved.