1980results about "Work treatment devices" patented technology

This invention discloses a process for controlling the shape of A514GrQ extra-thick plates for offshore platforms. It uses 800-1000mm thick steel ingots, and after removing and cleaning the ingot risers, ensures uniform thickness of the ingot body, laying the foundation for obtaining steel plates with excellent flatness. The heating process is optimized to ensure uniform heating of the ingot head, middle, and tail, facilitating uniform deformation during rolling. Homogenized rolling is employed to reduce cooling water usage, limit the reduction per pass, and control the final rolling temperature, avoiding uneven internal stress and shape rebound in the steel plate. The final product is a 180-210mm thick steel plate with a maximum flatness ≤8mm and a lateral flatness ≤4mm within a length of 10000mm and a width of 2400mm, significantly reducing subsequent leveling tasks.

The invention relates to the technical field of advanced high-strength steel for automobiles. The invention relates to cold-rolled dual-phase steel DP780 with low cost and high surface. The cold-rolled dual-phase steel DP780 comprises the following chemical components in percentage by mass: 0.10 to 0.15 percent of C, 0.20 to 0.40 percent of Si, 1.60 to 1.80 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, 0.015 to 0.035 percent of Al, 0.010 to 0.025 percent of Ti, 0.005 to 0.015 percent of Nb, less than or equal to 0.006 percent of N, less than or equal to 0.0003 percent of H and the balance of iron and inevitable trace impurities. The invention further provides a production method of the low-cost high-surface cold-rolled dual-phase steel DP780. The production method comprises the technological processes of smelting, continuous casting, casting blank reheating, rough rolling, finish rolling, cooling and coiling after rolling, hot coil acid continuous rolling and rolled hard coil continuous annealing. The 780MPa-grade cold-rolled dual-phase steel has the beneficial effects that the 780MPa-grade cold-rolled dual-phase steel which is small in alloy adding amount and easy to control steelmaking casting, hot rolling and continuous annealing can be stably obtained, and the use requirements of automobile parts are met.

The invention relates to the technical field of advanced high-strength steel for automobiles. The invention relates to cold-rolled dual-phase steel DP980 with low cost and high surface. The cold-rolled dual-phase steel DP980 comprises the following chemical components in percentage by mass: 0.07 to 0.10 percent of C, 0.30 to 0.60 percent of Si, 2.00 to 2.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.015 to 0.035 percent of Al, 0.010 to 0.040 percent of Nb, 0.010 to 0.040 percent of Ti, 0.10 to 0.30 percent of Cr, less than or equal to 0.006 percent of N, less than or equal to 0.0003 percent of H and the balance of iron and inevitable trace impurities. The invention provides a production method of low-cost high-surface cold-rolled dual-phase steel DP980. The production method comprises the technological processes of smelting, continuous casting, casting blank reheating, rough rolling, finish rolling, cooling and coiling after rolling, hot coil acid continuous rolling and rolled hard coil continuous annealing. The 980MPa-grade cold-rolled dual-phase steel has the beneficial effects that the 980MPa-grade cold-rolled dual-phase steel which is small in alloy adding amount and easy to control steelmaking casting, hot rolling and continuous annealing can be stably obtained, and the use requirements of automobile parts are met.

The invention discloses a V-B-Ti microalloyed 690 MPa grade steel for engineering machinery, and belongs to the field of metal processing. The steel comprises the following chemical components in percentage by weight: 0.13%-0.17% of C, 0.15%-0.25% of Si, 1.55%-1.7% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.017%-0.0250% of Ti, 0.1%-0.2% of Cr, 0.015%-0.045% of Als, 0.05%-0.08% of V, 0.0015%-0.0020% of B, 0.005%-0.0095% of N, 3.4%-3.8% of Ti / N and the balance of Fe and inevitable impurities, the total amount of other impurity elements is less than 0.05%, and the problems of low steel plate toughness and plate shape unevenness are solved.

The invention relates to the technical field of metal material hot working, and discloses a hot-rolled coiled plate production process which comprises the following steps: preparing a reaction type protective agent, the high-temperature-resistant coating is prepared from the following raw materials in parts by weight: 20 to 40 parts of tetraethoxysilane, 5 to 15 parts of triethyl phosphate, 1 to 5 parts of triethyl borate, 0.5 to 2.0 parts of cerous nitrate (III) hexahydrate, 0.1 to 1.0 part of lithium acetate and 0.01 to 0.05 part of vanadyl acetylacetonate (IV). Coating the surface of a hot-rolled plate blank with the protective agent; the coated plate blank is heated in a heating furnace, so that the protective agent forms a molten-state protective layer in situ; carrying out hot rolling on the plate blank with the molten protective layer; and cooling and coiling the hot-rolled steel strip. In the whole heating and hot rolling process, the molten protective layer isolates the contact between the steel and the oxidizing atmosphere, so that the generation of oxide scales is fundamentally inhibited, the production process is simplified, and the metal yield is increased.

The present invention relates to the technical field of seamless steel pipe production, and discloses a hot rolling production process for G115 seamless steel pipe, comprising the following steps: preparing a G115 steel hollow billet with a diameter smaller than that of a finished pipe; hot rolling, piercing and rolling the hollow billet to obtain a rough pipe; sizing the rough pipe to obtain a rough pipe; heat treating the rough pipe to form a semi-finished pipe; grinding and machining the semi-finished pipe to obtain a finished pipe. By adopting a production process of hollow billets with a diameter smaller than that of finished pipes + hot rolling, the production batch is flexible, the specification applicability is strong, and it is suitable for industrialized production of factories with complex specifications, the production efficiency and yield rate are significantly improved, the product surface quality is good, the metallographic structure and the longitudinal and transverse mechanical properties are uniform, the process is controllable, the quality is stable, the yield rate is high, and the economic benefits are significant.

The invention belongs to the technical field of titanium-steel composite plates, and particularly relates to a production process for preventing grain growth of a titanium-steel composite plate, which comprises the following steps: roughening the lower side surface of a titanium plate and the upper side surface of a steel plate by adopting a sand blasting process; an additive is sprayed to the upper side face of the steel plate and the lower side face of the titanium plate, the additive comprises boron powder and a binding agent, graphite foil is laid on the upper side face of the steel plate sprayed with the additive, the titanium plate sprayed with the additive is stacked on the steel plate, and the graphite foil is clamped by the upper side face of the steel plate and the lower side face of the titanium plate to prepare a composite plate blank; sealing the edge part of the composite plate blank by using a sealing material; the production process comprises the following steps: heating a composite plate blank through a heating furnace, rolling and cooling the heated composite plate blank, straightening the composite plate blank through a straightening machine, and trimming the straightened composite plate blank to obtain the titanium-steel composite plate. And the bonding strength and the shearing strength of the titanium steel composite plate are improved.

The invention relates to the technical field of low-carbon microalloyed steel production, in particular to economical thin L450M pipeline steel and a method for controlling a banded structure, the steel comprises the following chemical components in percentage by weight: 0.07%-0.09% of C, 0.10%-0.25% of Si, 1.70%-1.80% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.01%-0.02% of Nb, 0.008%-0.015% of Ti, 0.015%-0.04% of Al, 0.05%-0.15% of Cr, 0.003%-0.006% of N and the balance of Fe and inevitable impurities, and the total amount of impurity elements is less than 0.05%; the steel plate produced by the invention has the advantages of low cost, high strength and toughness, low yield ratio and high straightness, and can ensure the service safety of the gas transmission pipeline.

The present invention provides a soluble cold rolling oil composition in which oil particles of approximately 0.1 μm or less are dispersed in water, and which has rolling properties (particularly anti-seizure properties) equal to or better than those of water-insoluble rolling oils and emulsion-type rolling oils, while enabling the gloss of products to be made uniform and enabling an improvement in unit consumption compared to emulsion-type rolling oils; and a cold rolling method using the composition. [Solution] A cold rolling oil composition containing (A) a base oil, (B) a specific fatty acid, (C) a specific sulfur-based extreme pressure agent, (D) a specific water-soluble polymer, and (E) a specific amine, and a cold rolling method using the same.

The utility model discloses a flattening device for cold-rolled strip steel processing, and relates to the field of cold-rolled strip steel processing equipment. The device comprises a device body, a lower pressing roller is arranged on the lower portion of the interior of the device body, a liquid feeding mechanism is arranged on one side of the lower pressing roller, and the liquid feeding mechanism comprises a motor. At the moment, a liquid pump in the liquid bin can be started through an external controller, the leveling liquid is guided into the liquid storage pool, then a motor is started, the motor drives a first gear and a second gear to rotate, then the first gear and the second gear drive an upper sucking roller and a lower sucking roller to rotate, and the leveling liquid is sucked into the liquid storage pool. And in the rolling process of the lower sucking roller, the leveling liquid can be effectively wrapped on the lower sucking roller, so that the liquid can be conveniently fed on the ground of the cold-rolled strip steel.

The invention relates to the technical field of metal plate rolling processing, and discloses a rolling strengthening method capable of reducing the rigidity of a metal plate, which comprises the following steps: applying an asymmetric rolling condition to an initial plate to enable the plate to generate a speed gradient in the thickness direction; the plate is subjected to one-pass large-rolling-reduction rolling, and a non-continuously-distributed shear band is formed; the rolled plate is heated to the dynamic recrystallization temperature interval of the plate, and multi-pass small-rolling-reduction warm rolling is conducted on the plate; and in the warm rolling process, dynamic recrystallization of a shear band is promoted to form a grain-refined continuous core layer, complete recrystallization of the surface structure of the plate is inhibited to keep the work hardening state of the plate, and therefore the metal plate with the rigidity lower than that of an initial plate is obtained. According to the invention, a soft core-hard shell heterostructure is constructed in the plate, high strength and low macroscopic rigidity are synergistically realized, the process controllability is strong, and the method is suitable for preparation of high-performance structural materials.

The invention discloses V-N-B microalloyed 550MPa-grade steel for engineering machinery and a preparation method of the V-N-B microalloyed 550MPa-grade steel, and belongs to the technical field of low-carbon microalloyed steel production. The steel comprises the following components in percentage by weight: 0.06%-0.15% of C, 0.2%-0.35% of Si, 1.35%-1.65% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.01%-0.03% of Nb, 0.015%-0.0250% of Ti, 0.15%-0.25% of Cr, 0.015%-0.045% of Als, 0.05%-0.08% of V, 0.0012%-0.0020% of B, 0.01%-0.025% of N, 0.005%-0.010% of Ca and the balance of Fe and inevitable impurities, the total amount of other impurity elements is less than 0.05%, and the problems of low toughness and plate shape unevenness are solved.

The invention relates to the technical field of low-carbon microalloyed steel production, in particular to a low-yield-ratio economical thin L450M pipeline steel plate and a manufacturing method thereof.The low-yield-ratio economical thin L450M pipeline steel plate comprises, by weight, 0.05%-0.07% of C, 0.10%-0.25% of Si, 1.50%-1.65% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.015% of S, 0.02%-0.04% of Nb, 0.008%-0.020% of Ti, 0.015%-0.04% of Al, 0.25%-0.30% of Cr, 0.003%-0.006% of N, 0.36%-0.40% of CEIIW = C + Mn / 6 + (Cr + V + Mo) / 5 + (Cu + Ni) / 15 and the balance Fe and The production process comprises the steps of molten steel smelting, external refining and degassing, continuous casting, casting blank heating, controlled rolling, relaxation, controlled cooling and air cooling to the room temperature. The method is used for manufacturing the high-strength L450M hot-rolled steel plate for the low-yield-ratio economical oil pipeline with the thickness specification of 9-17.5 mm and the pipe diameter phi of 914 mm or below, the problems that the rolling efficiency of the steel plate is low, the rolling resistance is large, the plate shape is not easy to control and the like are solved, and the steel plate is low in cost, high in strength and toughness, low in yield ratio and high in straightness.

The invention relates to the field of seamless steel tube processing, and discloses a seamless steel tube production process and a seamless steel tube production line, a size changing process is added between a traditional heating process and a traditional punching process, and a square blank or a large-diameter circular blank (a first blank) is changed into a small-diameter circular blank (a second blank). The size changing procedure can be achieved through independent or combined rolling, push rolling and skew rolling processes, for example, push rolling is adopted for changing square billets into round billets, and a two-roller or three-roller skew rolling round billet machine is adopted for reducing the diameter. The first blanks in the heating furnace are arranged in double rows, meanwhile, the product outline is adjusted according to the capacity of a unit, and the front portion, the rear portion and the middle portion are subjected to optimized production, wherein double-row material distribution is achieved, the finished products are as long as 12 m, and cutting head loss is reduced. The matched production line is provided with size changing equipment (such as a section mill, a push mill and a skew mill combination) between a heating furnace and a perforating machine, square billets or round billets can be flexibly processed, the material distribution efficiency, the finished product length and the cost are balanced through the size changing technology, and the economical efficiency and flexibility of seamless steel pipe production are improved.

The invention provides aluminum foil blank processing and calendering equipment which comprises a box body, a calendering mechanism, two reversing rollers and a cleaning mechanism, and a cleaning agent is temporarily stored in the box body; the calendering mechanism comprises a compression roller assembly, a second compression roller, an oil supply assembly and two baffle rings, the compression roller assembly is arranged on the box body, the second compression roller is rotationally connected with the compression roller assembly, the two baffle rings symmetrically sleeve the outer side of the second compression roller, and the diameter of the baffle rings is larger than that of the second compression roller; the oil supply assembly is arranged on the box body, and the two ends of the oil supply assembly extend to the positions above the pressing roller assembly and the second pressing roller. The two reversing rollers are rotationally connected with the box body. According to the aluminum foil blank machining rolling equipment, the aluminum foil blank is coated with the rolling oil, so that the rolling oil is evenly distributed on the aluminum foil blank, the oil film is rapidly stripped in a soaking, pre-washing and active intruding mode during follow-up oil film cleaning, then residual oil on the surface of the aluminum foil is reduced, and the product quality is guaranteed.

The present invention discloses a rolling method for starting rolling of raw plates of non-oriented silicon steel with a silicon-aluminum content of 3.5-5% by threading the strip on a UCMW continuous rolling mill. The present invention adopts a method of starting rolling by pressing down in succession, which is different from the traditional method of starting rolling by pressing down in succession on 5 stands at the same time. It reasonably sets the appropriate rolling process for stands 1 to 5#, which can effectively improve the starting success rate of raw plates of non-oriented silicon steel with a silicon-aluminum content of 3.5-5%, and quickly resume production after the strip breaks during rolling. By using the method of the present invention to start rolling by threading the raw plates, the difficulty of non-steady-state rolling of each stand can be greatly reduced, the fluctuation of the rolling force and tension of each stand can be reduced, and the strip breaks during rolling can be avoided, providing the prerequisite for the UCMW cold continuous rolling mill to mass-produce high-grade non-oriented silicon steel with a silicon-aluminum alloy content of 3.5-5%.

The utility model discloses a rolling mill outlet guide plate which is arranged behind a roller of a rolling mill and comprises a driving assembly, a movable guide plate, a guide seat plate and a fixed guide plate, and the two ends of the fixed guide plate are fixedly connected to a rolling mill rack and located behind an outlet of the lower roller. The movable guide plate is arranged between the roller and the fixed guide plate, the two ends of the movable guide plate are connected to the guide seat plates in a guiding and sliding mode respectively, and the guide seat plates are fixedly connected to the inner side wall of the rolling mill rack. The driving assembly is installed on the rolling mill rack and can drive the movable guide plate to move front and back. By adopting the matching mode of the movable guide plate and the fixed guide plate, the threading difficulty is reduced, and the manpower is saved.

The invention discloses hot-rolled ultrahigh-strength automobile steel as well as a manufacturing method, a hot forming method and a cold forming method of the hot-rolled ultrahigh-strength automobile steel. Belongs to the technical field of steel for automobiles, and the steel for the automobiles comprises the following chemical components in percentage by weight: 0.22-0.27% of C, 1.2-1.8% of Si, 2.2-2.6% of Cr, 1.0-1.4% of Mn, 0.02-0.03% of Nb, 0.02-0.05% of Al, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.0003% of H and the balance of Fe and inevitable impurities. The automobile steel can be directly subjected to cold forming or hot forming, the tensile strength of the automobile steel can reach 1500 MPa or above during cold forming, the tensile strength of the automobile steel can reach 1800 MPa or above after hot forming, meanwhile, precious metal is not added, and the production cost is low.

The utility model discloses a cold rolling mill for reinforcing steel bar machining, and belongs to the technical field of reinforcing steel bar machining. The machine body comprises a transverse plate, a row of feeding ports are formed in the front end of the machine body, a row of through holes are formed in the two sides of the machine body, a T-shaped groove is formed in the machine body, a motor mounting hole is formed in the back of the machine body, the motor mounting hole is communicated with the T-shaped groove, and the cleaning assembly comprises a cleaning brush. The cleaning brush is installed in the feeding port, first bearings are arranged in the pair of through holes close to the front end of the machine body in a matched mode, first impurity removal rollers are arranged in the two first bearings in a matched mode, two electric push rods are installed on the transverse plate, the telescopic ends of the two electric push rods point to the first impurity removal rollers, and the servo motor is installed in the motor installation hole. The cleaning brush and the impurity removal roller are arranged to clean the surface of steel, meanwhile, the cutting assembly is arranged to cut rolled steel, and the problem of cleaning oxidation impurities on the surface of the steel is solved.

The invention discloses an efficient and low-cost high-strength steel plate for a 1300MPa-grade low-temperature engineering structure and a manufacturing method of the high-strength steel plate, and belongs to the technical field of low-carbon microalloyed steel production. Optimized steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, hot straightening and tempering processes are adopted, an ultra-fast cooling and laminar cooling mode is adopted for controlled cooling, chemical components of the steel plate contain Ce, and finally the problems that the 1300MPa-level hot-rolled steel plate with the thickness of 10-50 mm produced through an online cooling process is low in toughness, high in yield ratio, low in flaw detection qualification rate and uneven in plate shape are solved.

The utility model discloses a device for preventing a super duplex stainless steel hot rolled plate coil from being broken, which comprises a cooling device in laminar cooling, the cooling device comprises a rack, the rack is sequentially provided with a cleaning mechanism, a spraying pipeline, a straightening mechanism, a blowing mechanism, a temperature measuring mechanism and a cooling mechanism, the cooling mechanism comprises an adjusting mechanism and a pair of spraying mechanisms, and the spraying mechanisms are arranged on the rack. According to actual use conditions, the cleaning mechanism, the spraying pipeline and the purging mechanism are also arranged below the rack and are symmetrical to the cleaning mechanism, the spraying pipeline and the purging mechanism which are arranged above the rack; a plurality of groups of spraying pipelines are uniformly arranged, and a plurality of groups of cooling mechanisms are uniformly arranged. By means of the cooling device, the stainless steel plate can be effectively and evenly cooled, precipitation of harmful phases in the cooled duplex stainless steel plate is reduced, and then the belt breakage rate of the duplex stainless steel plate is reduced.

The utility model belongs to the technical field of extruding machines, and particularly relates to an extruding machine for copper rod production, which comprises a shell, sliding grooves are symmetrically arranged in the shell, sliding blocks are symmetrically arranged in the sliding grooves in a sliding mode, a first extruding roller is rotatably arranged between two sliding blocks, and a second extruding roller is rotatably arranged between the other two sliding blocks. Wherein a fixed rod is fixedly installed in one sliding groove and penetrates through the two sliding blocks in one sliding groove, a two-way threaded rod is rotatably installed in the other sliding groove, one end of the two-way threaded rod penetrates through the two sliding blocks in the other sliding groove, and a first motor is fixedly installed at the top of the shell. It is ensured that the distance between the first extrusion roller and the second extrusion roller can be adjusted, and therefore the device can be suitable for copper rods of different thicknesses and is convenient to use; and moreover, the brush can be cleaned in the cleaning process of the copper rod, so that dust cannot be attached to the brush.

According to the low-temperature steel plate with the excellent CTOD performance and the manufacturing method, a low-carbon chemical component system is adopted, and the grain size and precipitated phase composition of steel are controlled by adding alloy elements such as V-N, Ni, W and Zr; three-stage controlled rolling is adopted in the rolling process, the accelerated cooling and stacking slow cooling process is adopted in the rolled steel plate, the internal stress and precipitated phase distribution of the final steel plate are controlled, the yield strength of the steel plate produced through the method is larger than or equal to 550 MPa, and the CTOD value of the steel plate at the temperature of-60 DEG C is larger than 1.2 mm; meanwhile, under the 60 KJ / cm high heat input welding process, the impact absorption energy of a coarse grain area CGHZ of a welding joint at-80 DEG C is larger than or equal to 264 J, and the CTOD value at-60 DEG C is larger than 1.0 mm.

The invention provides a high-strength aluminum-clad steel wire and a preparation method thereof.The high-strength aluminum-clad steel wire comprises a steel wire and an aluminum layer wrapping the outer surface of a steel core, the steel wire comprises, by weight, 0.85%-0.90% of C, 0.1%-0.5% of Si, 0.1%-0.5% of Mn, 0.02%-0.05% of Al, 0.10%-0.20% of Cr, 0.10%-0.15% of Ca, smaller than or equal to 0.020% of P, smaller than or equal to 0.025% of S and the balance iron and inevitable impurity elements, and the preparation method comprises the steps that a steel billet is prepared, the steel billet is subjected to hot rolling, then the steel wire is subjected to isothermal cooling, and the high-strength aluminum-clad steel wire is obtained. The cooled steel wire rod is subjected to surface cleaning and then drawn to form a steel wire with the required wire diameter, the drawn steel wire is extruded and coated with a layer of aluminum to form a bus, the bus is subjected to drawing treatment, and the aluminum-clad steel wire is obtained.The preparation method of the aluminum-clad steel wire is simple in step and convenient to operate, and the prepared aluminum-clad steel wire has the advantages of being high in strength, good in corrosion resistance and the like. And the conductive performance is high.

The utility model provides a hot-rolled strip steel cooling water circulation system, which relates to the technical field of steel hot rolling, and comprises a water collecting tank, a filter tank, a heat exchange tank and a water storage tank, the water collecting tank is arranged below a cooling device, the lower end of the water collecting tank is communicated with the lower end of the filter tank, and the heat exchange tank is communicated with the water storage tank. The upper end of the filter tank is communicated with the upper end of the heat exchange tank, and the lower end of the heat exchange tank is communicated with the lower end of the water storage tank. The water collecting tank is used for collecting used cooling water in the cooling device and preliminarily settling the cooling water, the filtering tank is used for filtering the preliminarily settled cooling water, and the heat exchange tank is used for cooling the filtered cooling water; and the water storage tank is used for storing the cooled cooling water. The hot-rolled strip steel cooling water circulation system has the effect of reducing the energy consumption and investment of the existing hot-rolled strip steel cooling water circulation system.

The invention relates to the technical field of copper alloys, in particular to copper alloy performance optimization, and particularly relates to a process method for improving the bending performance of a copper strip used in the solar photovoltaic field. The invention discloses a process method for improving the bending performance of a copper strip in the solar photovoltaic field. Comprising the following steps of smelting, casting, stepping furnace heating, hot rolling, surface milling, primary cold rolling, edge cutting, primary annealing, semi-finished product cleaning, secondary cold rolling, secondary annealing, pre-finished product cleaning, third cold rolling, finished product cleaning, pulling and straightening, slitting and packaging. The bending performance of the C19210 copper strip used in the solar photovoltaic field is improved through control over the smelting component Fe element, precise control over matched heat treatment parameters and cooperation with the reasonable cold deformation machining degree, the tensile strength of the copper strip is 340-390 MPa, the A11.3 elongation is larger than or equal to 10%, the hardness HV value is 105-125, and no obvious crack exists in a 90-degree bending test in the strip rolling direction and the direction perpendicular to the strip rolling direction.

The utility model relates to a thin slab and conventional slab hot continuous rolling combined unit which comprises a thin slab production line and a conventional slab production line, and the thin slab production line comprises a thin slab continuous casting machine, a fixed section tunnel furnace and a transverse moving section tunnel furnace which are collinearly arranged in sequence; the conventional plate blank production line comprises a rough rolling unit, a transverse moving section unit and a finish rolling unit which are collinearly arranged in sequence; wherein the transverse moving section unit is suitable for transversely moving towards one side far away from a sheet billet production line, and the transverse moving section tunnel furnace is suitable for transversely moving between the sheet billet production line and a conventional sheet billet production line; and the upstream of the rough rolling unit is connected with a plate blank heating furnace. According to the utility model, hot rolling joint production of a thin slab and a conventional slab can be realized, and the process flexibility is high; through cooperation of the transverse moving section tunnel furnace and the transverse moving section unit, the sheet billet production line transversely moves to supply billets to the conventional sheet billet production line and can share the finish rolling unit with the conventional sheet billet production line, and therefore reasonable coupling of the two production lines is achieved.

The invention discloses a control method and device for improving black marks on the surface of a thick plate in the technical field of controlled rolling and controlled cooling. The method comprises the steps that a pretreated plate blank is obtained; the pretreated plate blank is heated according to a preset heating system, and a heated plate blank is obtained; the heated plate blank is input into a descaling box to be descaled, and a plate blank subjected to primary descaling is obtained; the plate blank subjected to primary descaling is firstly input into a roughing mill to be subjected to cogging broadening and then input into a finishing mill to be subjected to thickness rolling treatment, and a semi-finished steel plate is obtained; and straightening and cooling the semi-finished steel plate to obtain a finished steel plate. The technical problem that in the prior art, due to existing controlled rolling and controlled cooling processes, black marks appear on the surface of the steel plate, and consequently the production cost is increased can be solved.

The invention relates to the technical field of low-carbon microalloyed steel production, in particular to an efficient rolling low-yield-ratio 345 MPa-grade low-temperature pressure vessel steel plate and a preparation method thereof.The steel plate comprises, by weight, 0.15%-0.18% of C, 0.20%-0.25% of Si, 1.05%-1.55% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.015% of S, 0.01%-0.02% of Nb, 0.015%-0.04% of Al, 0.003%-0.006% of N and the balance Fe and inevitable impurities, and the total amount of impurity elements is smaller than 0.05%; the preparation method of the steel plate comprises the following technological processes of molten steel smelting, external refining and degassing, continuous casting, casting blank heating, controlled rolling, controlled cooling and air cooling to the room temperature. According to the method, the continuous casting billet with the thickness of 170-250 mm is used for efficiently producing the 345 MPa grade steel plate with the thickness of 10-50 mm and the low yield ratio for the low-temperature pressure vessel, the steel plate has the advantages of low cost, high strength and toughness, the low yield ratio and high straightness, and the service safety of the steel plate for the low-temperature pressure vessel can be guaranteed.

The application provides a corrosion-resistant super-large line energy welding steel plate and a production method thereof, relates to the technical field of alloys, and the steel plate adopts a corrosion-resistant alloying component system with composite addition of Ce, Sn and Cu. The addition of Ce can improve the corrosion resistance of the steel plate, and Ce is easy to combine with oxygen to generate spherical oxides and has the ability to induce the nucleation of intracrystalline acicular ferrite, thereby improving the welding performance of the steel plate. On the basis of the comprehensive design of chemical components, the process parameters of rolling and cooling processes are accurately controlled to obtain the corrosion-resistant super-large line energy welding steel plate with good comprehensive performance.