988results about "Temperature control device" patented technology

The invention relates to the technical field of steel smelting, and provides low-temperature corrosion-resistant steel for a high-cold frozen soil environment and a preparation method of the low-temperature corrosion-resistant steel. The invention relates to low-temperature corrosion-resistant steel for a high and cold frozen soil environment, which is prepared from the following components in percentage by mass: 0.04 to 0.06 percent of C, 0.15 to 0.40 percent of Si, 0.80 to 1.20 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 0.30 to 0.60 percent of Cr, less than or equal to 0.50 percent of Ni, 0.20 to 0.50 percent of Cu, 0.010 to 0.030 percent of Nb, 0.010 to 0.030 percent of Ti, 0.0010 to 0.015 percent of La, 0.0020 to 0.020 percent of Ce and the balance of Fe and inevitable impurity elements. Wherein the proportional relation of Nb, Ti, La and Ce is (Nb + Ti) / (La + Ce), and the value of the (Nb + Ti) / (La + Ce) is 1.5-9. Through the technical scheme, the problem of poor low-temperature toughness of steel in related technologies is solved.

The invention provides a cold heading steel wire rod rolling temperature closed-loop control method and system based on PID, and relates to the technical field of cold heading steel wire rod rolling process control, and the cold heading steel wire rod rolling temperature closed-loop control method comprises the following steps: determining temperature control parameters of a rolling area of a rolling mill in different rolling stages of a cold heading steel wire rod according to process requirements of the cold heading steel wire rod; constructing dynamic thermodynamic models of different rolling stages; the real-time state data and the real-time temperature data are preprocessed; the extracted temperature control parameters are compared with the preprocessed real-time temperature data; based on the dynamic thermodynamic model and the real-time temperature deviation, the control quantity is calculated through a PID algorithm, and a control instruction is output to an execution mechanism of the rolling mill; and an execution mechanism of the rolling mill receives the instruction and carries out temperature adjustment action. The method can effectively guarantee that the temperature in each rolling stage is stable, the quality consistency of cold heading steel wire rod products is improved, and the dynamic change requirement in the rolling process is met.

The invention provides rolling equipment, a current collector, a preparation method of the current collector, a pole piece, a battery and a device. A rolling device comprises a roller mechanism, a flow control mechanism and a power mechanism. The roller mechanism comprises at least two opposite rollers arranged at intervals and a flow control mechanism. The flow control mechanism is used for independently controlling the flow of the cooling medium in each cooling channel; the power mechanism is used for driving at least one roller to rotate. According to the rolling equipment, the roller diameter of the roller can be simply, effectively and flexibly adjusted by controlling the flow, so that the thickness of a rolled membrane material is adjusted, for example, a current collector with a large thickness in a tab area is prepared, the current collector is used for preparing an electrode pole piece, the problem of belt breakage in mass production of the electrode pole piece can be solved, and the production efficiency of the electrode pole piece is improved. And the yield of electrode plate production is improved.

The invention discloses a hot-rolled strip steel coiling temperature control method and related equipment, and relates to the technical field of hot-rolled strip steel, and the method comprises the following steps: determining a constant finish rolling speed of strip steel through a quadratic programming optimization algorithm based on a finish rolling outlet speed set value and a target finish rolling temperature of the strip steel; controlling the strip steel to pass through a laminar cooling area at a constant finish rolling speed and reach a target finish rolling temperature; the steel type specification, the constant finish rolling speed and the target finish rolling temperature of the strip steel are input into the heat flow density prediction model, and the heat flow density self-adaptive coefficient of the laminar cooling area is output through the heat flow density prediction model; based on the heat flow density self-adaptive coefficient and the target coiling temperature of the strip steel, the head preset header water quantity of the strip steel is determined; and in the process that the strip steel passes through the laminar cooling area, the head actual header water quantity of the strip steel is adjusted to the head preset header water quantity, so that the coiling temperature of the strip steel reaches the target coiling temperature.

The invention relates to the technical field of medium manganese steel, in particular to high-strength and high-toughness medium manganese steel and a preparation method thereof.The preparation method is characterized by comprising the steps that S1, smelting is conducted through an electric furnace according to the chemical component ratio of the medium manganese steel, then refining is conducted through a ladle refining furnace, then vacuum degassing treatment is conducted through a vacuum circulation degassing method, and then continuous casting is conducted to form a plate blank with the thickness being 200-300 mm; s2, the plate blank is heated to 1150-1250 DEG C in a walking beam furnace, heat preservation is conducted for 2-4 hours, and then a controlled rolling technology is adopted to machine the plate blank into a steel plate within the range of 4-20 mm; s3, after rolling is completed, the steel plate is treated through a composite cooling technology of ultra-fast cooling and laminar cooling; s4, the cooled steel plate is heated to 750-850 DEG C, heat preservation is conducted for 10-60 minutes, and a ferrite and austenite double-phase structure is formed; the comprehensive performance is greatly improved, and excellent strength, plasticity, low-temperature toughness and welding adaptability are shown.

The invention belongs to the technical field of manufacturing of low-alloy high-strength steel, and particularly relates to atmospheric corrosion resistant HC260LA low-alloy high-strength steel and a production method of the atmospheric corrosion resistant HC260LA low-alloy high-strength steel. 0.15% to 0.30% of Si; 0.40% to 0.60% of Mn; 0.06% to 0.10% of P; less than or equal to 0.015% of S; 0.02% to 0.08% of Al; 0.10% to 0.20% of Cu; 0 to 0.15% of Ti; 0 to 0.09 percent of Nb; 0.001% to 0.006% of N; and the balance of Fe and inevitable impurities. According to the method, the blocking effect of segregation of P-Cu elements on the grain boundary on a corrosion path is utilized, low-temperature rolling is combined, a three-dimensional corrosion-resistant system of fine grain strengthening, substructure strengthening and rust layer protection is constructed, and the weather resistance, the corrosion resistance and the mechanical property are jointly improved.

This invention provides a method for producing small-diameter, thick-walled near-α-type titanium alloy tubing and its application. This method, through the use of cladding and heated rolling, increases the deformation per rolling pass, reduces the number of rolling passes, and results in a finer microstructure and better mechanical properties in the heated-rolled tubing. Simultaneously, the composite material composed of the cladding layer and silica aerogel effectively prevents the alloy rod from contacting air, avoiding further surface oxidation and reducing the thickness of the oxide layer on the rod surface. Furthermore, the composite material forms a "thermal insulation layer" on the surface of the alloy rod, preventing large temperature differences between the surface and core during heated rolling, thus ensuring better microstructure uniformity and surface quality. In this invention, the cladding process expands the selection of heating furnaces and reduces equipment requirements.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

The invention relates to the technical field of high-speed cable shielding materials, and discloses a manufacturing method of rolled copper foil for high-speed cable shielding. The method comprises the following steps: preparing a copper plate; performing multi-pass cold rolling on the copper plate to form an elongated grain structure oriented along the rolling direction; performing controlled annealing on the cold-rolled copper foil to recover plasticity and inhibit complete recrystallization; the target thickness is obtained through finish rolling; carrying out finishing rolling on at least one surface of the copper foil by adopting a mirror surface working roller so as to reduce the surface roughness; and performing surface smoothing or passivating treatment to inhibit oxidation and performance degradation. Therefore, the obtained rolled copper foil has good ductility, structural stability and high-frequency performance.

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 application discloses an easy-to-cut steel with excellent plasticity and drilling performance and a preparation method thereof, and the preparation method comprises the following steps: converter smelting, LF refining, continuous casting, hot rolling and air cooling line cooling; in the continuous casting step, the water quantity of a crystallizer is 130-140 m 3 / h, and the secondary cooling water quantity is 0.8-1.0 L / kg; in the air cooling line cooling step, the cooling speed is 1-1.5 DEG C / s from the spinning temperature to greater than 650 DEG C, and the cooling speed is 2-4 DEG C / s in the range of 650 DEG C-500 DEG C; under the condition of not adding easy-to-cut elements and increasing production cost, the plasticity and drilling performance of the easy-to-cut steel are significantly improved by controlling the manganese sulfide inclusion size, hardness and structure of the rolled material.

The present invention relates to an X70 pipeline steel of extremely low-temperature high toughness for transport of CO2 and a manufacturing method therefor. In addition to Fe and unavoidable impurities, the X70 pipeline steel further comprises the following chemical components in percentage by weight: C: 0.03-0.08%, Si: 0.10-0.30%, Mn: 0.8-1.5%, P≤0.0070%, S≤0.0012%, Ni: 0.05-0.50%, Cr: 0.1-0.6%, Mo: 0.01-0.08%, Nb: 0.02-0.05%, V: 0-0.03%, Ti: 0.005-0.020%, Ca: 0.0010-0.0035%, all aluminum Alt: 0.010-0.040%, B≤0.0005%, O≤0.0030%, and Re: 0.0001-0.0030%, Re being Ce and La.

The invention discloses high-performance bridge steel and a production method thereof, and belongs to the technical field of ferrous metallurgy. The bridge steel comprises the following chemical components in percentage by mass: 0.09%-0.11% of carbon; silicon: less than or equal to 0.55%; 1.4%-1.6% of manganese; less than or equal to 0.018% of phosphorus; sulfur: < = 0.005%; 0.15% to 0.20% of niobium; less than or equal to 0.08% of vanadium; 0.006% to 0.03% of titanium; 0.01 to 0.02 percent of chromium; 0.01% or less of nickel; less than or equal to 0.3% of copper; 0.01% to 0.045% of aluminum; less than or equal to 0.3% of molybdenum; not more than 0.008% of nitrogen; and the balance of iron and inevitable impurities. According to the high-performance bridge steel and the production method thereof, by optimizing the component design and the production process, production of the bridge steel with high strength, low yield ratio, high toughness and good welding performance can be achieved.

The invention belongs to the field of profile steel production, and particularly relates to a rolling method of hot-rolled Q450NQR1 weather-resistant H profile steel, which adopts a reversible cogging mill and a universal finishing mill group for rolling: after the cogging mill rolls for 3-5 passes for cogging, a universal continuous rolling mill is adopted for finish rolling 9 continuous rolling, and the arrangement sequence of finish rolling hole patterns is U1-U2-U3-E4-U5-U6-U7-E8-U9; wherein the U3 and the U6 are curved web hole patterns, and the vertical roll is in drum-shaped design. The method has the advantages that one BD cogging mill is used for large-rolling-reduction rolling to crush crystal grains, and then the nine-rack universal continuous rolling mill is used for finish rolling, so that the metal flowing and steel biting conditions are improved. The grain structure is refined through large rolling reduction and low-temperature rolling, the problems that the Q450NQR1 weathering resistant steel is poor in metal fluidity, prone to cracking and the like due to alloy elements are effectively solved, and meanwhile the mechanical property, the size precision and the surface quality of products are guaranteed.

The invention discloses high-wear-resistance environment-friendly pre-hardened low-crack-sensitivity saw blade steel and a manufacturing method thereof. The high-wear-resistance environment-friendly pre-hardened low-crack-sensitivity saw blade steel comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.3 to 0.8 percent of Si, 1.2 to 1.6 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 0.10 to 0.40 percent of Cr, less than or equal to 0.45 percent of Mo, 0.01 to 0.08 percent of Als, 0.0005 to 0.0020 percent of B, 0.010 to 0.030 percent of Ti, 0.0015 to 0.0035 percent of Mg, 0.2 to 0.4 percent of TiB2 and the balance of Fe and inevitable impurities. Ti / (Mg + B) is equal to 5.0 to 6.0, and B / TiB2 is equal to 0.0025 to 0.0050; the manufacturing method comprises the steps of smelting and refining, continuous casting, heating, rolling, cooling and straightening. Production of the high-performance pre-hardened saw blade steel is achieved through the low-carbon multi-element composite microalloying and controlled rolling and controlled cooling processes, the saw blade steel has good matching of strength, plasticity and toughness, meanwhile, online pre-hardening is achieved, offline oil quenching and tempering treatment are omitted, and environment-friendly pre-hardening production of the saw blade steel is achieved.

The invention provides a hot continuous rolling temperature control method and system and electronic equipment, and relates to the technical field of metallurgical industry process control. The method comprises the steps that multi-modal data of the hot continuous rolling production process at the current moment is obtained; performing feature extraction on the multi-modal data to obtain heat exchange features related to the strip steel in the hot continuous rolling production process, and constructing a state vector based on the heat exchange features; according to the state vector, cooperative operation is carried out through a mechanism rule in the equivalent heat exchange coefficient dynamic model and a machine learning correction item, and an equivalent heat exchange coefficient at the current moment is obtained; according to the equivalent heat exchange coefficient, in combination with a preset temperature target, a composite control strategy including rack control and temperature control at the current moment is generated; and controlling the execution mechanism to operate according to the composite control strategy. By means of the equivalent heat exchange coefficient dynamic model, the stability and consistency of the strip steel temperature under the dynamic rolling working condition are guaranteed, and the temperature control effect is improved.

The invention relates to the technical field of metal materials, in particular to a high-strength steel material for mine roadway support and a preparation method thereof, and the high-strength steel material comprises the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.15 to 0.45 percent of Si, 1.20 to 1.80 percent of Mn, 0.20 to 0.50 percent of Cu, 0.15 to 0.40 percent of Cr, 0.10 to 0.35 percent of Ni, 0.08 to 0.25 percent of Mo, 0.015 to 0.045 percent of Nb, 0.03 to 0.08 percent of V, 0.008 to 0.025 percent of Ti, 0.005 to 0.020 percent of RE and the balance of Fe. The preparation method comprises the steps of smelting and refining, continuous casting, heating, rough rolling, finish rolling, segmented controlled cooling and medium-temperature tempering (450-550 DEG C), R is larger than or equal to 620 MPa, A is larger than or equal to 18%, the yield ratio is smaller than or equal to 0.90, KV at 0 DEG C is larger than or equal to 100 J, and the deep-well high-stress roadway support is suitable for deep-well high-stress roadway support.

The invention discloses a production method of low-cost cold-rolled dual-phase steel DP980 with yield strength of 550-760 MPa, which comprises the following steps: (1) smelting and continuous casting: molten steel for a casting machine comprises the following components in percentage by mass: 0.090-0.120% of C, 0.40-0.60% of Si, 2.40-3.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.015-0.045% of Alt, 0.10-0.30% of Cr, 0.020-0.045% of Nb, 0.015-0.035% of Ti, 0.0008-0.0030% of Ca and 0.0030-0.0070% of N; (2) hot rolling; (3) pickling and cold rolling; and (4) continuous annealing and leveling. The cold-rolled dual-phase steel disclosed by the invention has the characteristics of low yield ratio, high elongation percentage, excellent formability and the like.

The invention provides a hot continuous rolling finish rolling section cooling method, system and equipment and a storage medium, and relates to the technical field of metallurgy hot rolling control, and the method comprises the steps that according to a product outline and a rolling schedule of rolled strip steel in a hot continuous rolling finish rolling section, the proportional relation between the inlet cooling water amount and the outlet cooling water amount is determined; based on the thermal load distribution of each area section of a roller in the hot continuous rolling finish rolling section and the width parameter of rolled strip steel, the distribution modes of inlet cooling water and outlet cooling water are determined respectively; when the hot continuous rolling finish rolling section is cooled according to the proportional relation and the distribution mode, rolling process parameters of the hot continuous rolling finish rolling section are obtained; and according to the rolling process parameters, in combination with a preset roller system model and a strip steel metal model, coupling control is conducted on the proportional relation and the distribution mode of the inlet cooling water amount and the outlet cooling water amount, and meanwhile fine adjustment is conducted on the inlet cooling water amount and the outlet cooling water amount till the hot continuous rolling finish rolling section meets the machining requirement. The cooling effect of the hot continuous rolling finish rolling section is improved.

The present application relates to the technical field of steel plate production, and particularly relates to a production method of an extremely thin Nb-containing 355MPa-grade pickling plate, which comprises the following steps: 1) slab blanking: the difference between the slab width and the target width is controlled to be within 50mm, and the slab single weight is controlled according to the single steel rolling distance within 1150m; 2) heating: the air-fuel ratio of the heating furnace is set to be 1.8-2.0, the furnace atmosphere is controlled to be weak oxidizing, the furnace outlet temperature is 1220-1240 DEG C, the second heating section + soaking time is greater than or equal to 65min, the total in-furnace time is greater than or equal to 170min, and the interval between the steel tapping is greater than or equal to 160s; 3) rough rolling: the slab outlet does not use the SP width press, the rough rolling adopts two rolling mills, and each rolling mill is rolled for three passes; the descaling water is fed in each pass; 4) finish rolling: the finish rolling inlet temperature is controlled to be 1050-1080 DEG C, and the finish rolling temperature is within the range of 860-900 DEG C; 5) when the flatness defect occurs during the coiling, the cooling setting time is increased in the coiling drum. The present application guarantees the stable rolling and improves the surface quality of the steel plate.

The invention provides soft magnetic stainless steel and a preparation method thereof. The soft magnetic stainless steel provided by the invention comprises the following elements in percentage by weight: 0.01%-0.12% of C, 0.18%-0.80% of Si, 0.3%-1.2% of Mn, 10.8%-22.3% of Cr, 0.04%-0.25% of Cu, 0.04%-0.38% of Mo, 0.15%-1.2% of Ni, less than or equal to 0.004% of S, less than or equal to 0.03% of N, less than or equal to 0.0025% of O, 0.25%-1.5% of Al, 0.003%-0.015% of Re and the balance of Fe. The soft magnetic stainless steel provided by the invention has a uniform microstructure, excellent magnetic performance, corrosion resistance and workability.

The invention discloses a front feedback control long material precise cold control facility and a control method. The cold control facility comprises a cooling water inlet flow meter assembly, a membrane valve opening degree pneumatic power assembly, a cooling water flow adjusting valve set, a cooling water pressure measuring assembly, a cooling water temperature measuring assembly, a pneumatic stop valve power assembly, a cooling water pneumatic stop valve set, a pressure maintaining pneumatic stop valve set and a reverse blowing water pneumatic stop valve set. The device comprises a back-blowing compressed air valve group, a pressure-maintaining overflow water flowmeter assembly, a pressure-maintaining overflow valve assembly, a back-blowing air nozzle assembly, a back-blowing water nozzle assembly, a cooling water nozzle assembly, a rolled piece inlet temperature measurement assembly and a rolled piece outlet temperature measurement assembly. The rolling units are subjected to finite division, the neural network method is adopted to analyze the collected big data of the finite units and the boundary influence factors, the influence of the boundary influence factors on the temperature in the rolling process is accurately recognized, the accuracy of temperature control is effectively improved, the yield is improved, and the production cost is effectively reduced.

The application discloses a kind of automobile structure steel with yield strength 1000MPa and above and its manufacturing method, its component weight percentage is as follows: C 0.15~0.23%;Si 0.12~0.5%;Mn 1.6~2.4%;B 0.001~0.004%;Al 0.01~0.04%;Cr;0.05~0.5%;Mo 0.15~0.5%;P≤0.015%;S≤0.005%;Rest contains Fe and other inevitable impurities, and need to satisfy the following relationship: the eigenvalue Bs of lower bainite formation rate=0.6~1.4, Bs=(Mo+B*100-Mn / 5) / C;Its microstructure lower bainite≥95%.The automobile structure steel of the application has yield strength≥1000MPa, tensile strength≥1180MPa, elongation≥7%, 180° bending performance d≤3.5T.The automobile structure steel obtained by the application not only has ultrahigh strength, but also has excellent forming performance, especially bending forming performance, and is especially suitable for manufacturing automobile chassis system parts.

The invention discloses a production method for improving the structure uniformity of a 304 austenitic stainless steel medium-thickness plate, belongs to the field of stainless steel production, and solves the problem that mixed crystal structures often appear in the structure of the 304 austenitic stainless steel medium-thickness plate produced by an existing method. The method comprises the following steps: producing a 304 austenitic stainless steel continuous casting sheet billet; the plate blank is heated for the first time, the temperature of a heating furnace is set to be 1280-1300 DEG C, the heating time is 300-360 min, and natural cooling is conducted; the plate blank is remelted, heated and rolled again, the heating temperature is set to be 1250-1270 DEG C, the heating time is 240-300 min, and the remelted and reheated plate blank is rolled to the target thickness; and solution treatment is conducted, the solution treatment temperature ranges from 1050 DEG C to 1080 DEG C, the solution treatment time coefficient ranges from 1.0 min / mm to 2.0 min / mm, and water cooling is conducted to the room temperature. The structure uniformity of the 304 austenitic stainless steel medium plate produced by the method is obviously superior to that of a traditional method.

This invention discloses a full-section high-toughness S420KT-50 extra-thick steel plate for offshore oil and gas platforms and its manufacturing method, belonging to the field of iron and steel metallurgical production technology. The chemical composition of the steel plate, by mass percentage, is: C: 0.025–0.065%, Si: 0.10–0.40%, Mn: 1.35–1.60%, P≤0.012%, S≤0.003%, Nb: 0.025–0.040%, Ni: 0.20–0.50%, N≤60ppm, H≤2ppm, As≤0.030%, S… The composition is as follows: b≤0.010%, Sn≤0.020%, Pb≤0.010%, Bi≤0.010%, Ca≤0.0050%, B≤0.0005%, with the balance being Fe and unavoidable impurity elements. The sum of all the above components is 100%. A manufacturing method is also designed. This manufacturing method, through low-C design and low-temperature heating + low-temperature rolling technology, achieves an impact toughness of ≥150J, yield strength ≥420MPa, tensile strength: 500~690MPa, and elongation ≥19% at -50℃ for the entire cross-section of the steel plate near the surface and 1 / 2 of the plate thickness.

The application discloses a production method of a mining rare-earth wear-resistant GN-14A hot-rolled round steel, and a steelmaking process is as follows: a converter is operated with double-slag, and an end-point basicity is controlled at 2.5; the end-point control target of the converter is C >= 0.08%, and P <= 0.020%; a VD deep vacuum time is >= 15 min, and a soft blowing time is >= 20 min; a superheat degree is <= 25 DEG C, a caster pulling speed is 0.55 m / min <= 0.60 m / min; a casting blank slow cooling time is >= 24 hours; and a rolling process is as follows: 1020 DEG C <= open rolling temperature <= 1050 DEG C; 780 DEG C <= final rolling temperature <= 850 DEG C; 450 DEG C <= entering slow cooling pit temperature <= 550 DEG C; and 50 DEG C <= exiting slow cooling pit temperature <= 150 DEG C. The hot-rolled round steel prepared by the application has a structure of ferrite + pearlite structure, inclusion levels of A class <= 1.5 level, B class <= 1.5 level, C class <= 1.0 level, D class <= 1.5 level, and austenite grain size >= 5 level.

The invention relates to rare earth steel for a 355MPa-grade hull structure and a preparation method of the rare earth steel, belongs to the technical field of metal materials, and solves the problems that the existing steel for the 355MPa-grade hull structure is poor in comprehensive performance and cannot meet the service requirements of high-end ships. The steel comprises the following chemical components in percentage by weight: 0.10%-0.15% of C, 0.20%-0.50% of Si, 0.70%-1.00% of Mn, 0.03%-0.10% of V, 0.10%-0.30% of Cu, 0.04%-0.08% of Mo, 0.10%-0.20% of Cr, 0.30%-0.40% of Ni, 0.003%-0.01% of Ce, less than or equal to 0.01% of P, less than or equal to 0.01% of S, less than or equal to 0.003% of O and the balance of iron and inevitable impurities. The prepared 355MPa-grade rare earth steel for the hull structure has obdurability and corrosion resistance at the same time.

The application discloses a kind of electromagnetic regulation and control roller multi-section joint regulation method and device, it is related to plate strip rolling mill technical field. Including: the electromagnetic rod in the electromagnetic regulation and control roller to be regulated is carried out parameter regulation;Plate shape data after rolling is obtained to determine the electromagnetic rod to be regulated, and the regulation control roll gap shape is carried out;The electromagnetic rod needing to be carried out is obtained to be applied to outer section cooling and applied to outer section cooling;Electromagnetic rod is carried out electromagnetic regulation and control roll shape preset and obtains the undetermined coefficient of electromagnetic rod;According to undetermined coefficient, the actual regulation and control parameter matrix of electromagnetic rod is obtained by parameter matching of electromagnetic rod, and the multi-section joint regulation of the electromagnetic regulation and control roller to be regulated is completed.The application can carry out multi-section roll shape preset and parameter matching to the electromagnetic regulation and control roller of various forms electromagnetic rod, and feedback adjustment is carried out according to on-line detection data, and then the stability of electromagnetic regulation and control roll shape is ensured.

The invention relates to an apparatus (1) and to a method for producing flat-rolled products from metal slabs, preferably thick slabs having a thickness of at least 140 mm, wherein the apparatus (1) comprises: at least one casting machine (10) which is designed to cast a strand from a metal, preferably steel; a transport device (30) which is designed to transport the strand in a transport direction along a transport line (T); a separating device (14) which is arranged downstream of the casting machine (10) in the transport line (T) and is designed to separate the strand into individual slabs; a rolling device (50) which is arranged downstream of the separating device (14) in the transport line (T) and is designed to roll each slab into a flat-rolled product; a temperature setting system (20) comprising an induction heating device (22) which is arranged between the separating device (14) and the rolling device (50) and is designed to heat the slabs to a hot-rolling temperature; and a control device (100) which is in communication with the induction heating device (22) and is designed to actuate the induction heating device (22) such that each slab is heated in a non-uniform manner along its longitudinal extent.

The present application discloses a producing method of a non-oriented silicon steel thin sheet. The method comprises processes of a slab continuous casting, a slab heating, a transfer bar preparation, a surface treatment, a billet assembly, a heating, a hot rolling, no normalizing, a pickling, a cold rolling, an annealing and a coating, and also comprises a coil separation process located before or after the cold rolling process; wherein, in the surface treatment process, a transfer bar enters a tunnel furnace for a high-temperature reduction heat treatment in a reducing atmosphere, a holding temperature is 950~1000°C, and a holding time is 15~30min; a single-layer non-oriented silicon steel product with a thickness of 0.15~0.30mm is produced. The present application obtains a thin-specification high-grade non-oriented silicon steel, and has a low production cost and a low production difficulty.