385 results about "Laminar cooling" patented technology

The invention discloses a method for preventing a high-carbon tool steel hot rolled steel coil from being flattened, which comprises the following steps of: providing a continuous casting slab which comprises the following components in percentage by mass: 0.65 to 1.35 weight percent of C, 0 to 1.6 weight percent of Si, 0 to 1.2 weight percent of Mn, 0 to 1.2 weight percent of Cr, less than or equal to 0.030 weight percent of P, less than or equal to 0.030 weight percent of S and the balance of iron and inevitable impurities; the charging temperature of the continuous casting sheet billet is larger than or equal to 300 DEG C, the continuous casting sheet billet is fed into a heating furnace to be heated, the discharging temperature of the continuous casting sheet billet is 1150-1250 DEG C, and a first sheet billet is obtained; the first plate blank is subjected to rough rolling, the rough rolling and finish rolling temperature ranges from 1050 DEG C to 1150 DEG C, and an intermediate blank is obtained; the intermediate billet is subjected to finish rolling, the finish rolling temperature of finish rolling is 800-950 DEG C, and finish rolled steel is obtained; laminar cooling is conducted on the finish-rolled steel in a front-section centralized cooling mode, final fine adjustment water and front and rear side spraying of laminar cooling are closed, the temperature of the finish-rolled steel is reduced to the first target temperature to the phase transformation point, and cooled steel is obtained; and the cooled steel is coiled at the temperature of 590-690 DEG C, the coiling tension is increased by 10%-20% in the coiling process, and a hot rolled steel coil of the high-carbon tool steel is obtained.

The invention discloses 700Mpa-grade hot-rolled wheel steel and a preparation method thereof, and belongs to the technical field of metallurgy. The steel for the wheel comprises the following chemical components in percentage by mass: less than or equal to 0.1% of C, 0.05-0.10% of Si, less than or equal to 1.65% of Mn, less than 0.015% of P, less than 0.005% of S, less than 0.060% of Nb, less than 0.020% of Ti, less than 0.03% of Cr, less than 0.045% of A1s, less than 0.005% of N, less than 0.003% of O and the balance of iron and inevitable impurities. The production method comprises the procedures of molten iron pretreatment, converter smelting, LF refining, RH refining, slab continuous casting, heating, rolling, laminar cooling and coiling. Under the condition that expensive Mo element is not added, through reasonable component design and a controlled rolling and controlled cooling process, the yield strength of the wheel steel is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 680 MPa, the ductility is larger than 18%, and the wheel steel has good welding performance and machining performance.

The invention discloses a production method of 700MPa-grade high-strength weathering steel. The production method comprises the following steps: smelting and continuous casting production process flow: molten iron pretreatment, converter treatment, LF (ladle furnace) refining and machine casting; the components of the molten steel for the casting machine in percentage by mass are limited; according to the hot rolling production technological process, the casting blank tapping temperature is 1230 + / -20 DEG C, the finish rolling temperature of finish rolling is 890 + / -10 DEG C, the cooling speed is 10-20 DEG C / S, and the thickness of a hot rolled steel strip is 2.5-3.5 mm; laminar cooling equipment is adopted for cooling, a pre-dispersion cooling mode is adopted, and the coiling temperature is 640 + / -10 DEG C. A conventional C, S, i and Mn component system design is adopted, the content of corrosion-resistant alloy elements is properly reduced by adding corrosion-resistant elements Cu, Cr and Ni, the production cost is reduced, and meanwhile good performance is achieved.

The utility model provides a uniform cooling device for hot-rolled low-carbon strip steel. The uniform cooling device comprises a laminar cooling section, an aerial fog cooling section and a water replenishing cooling section which are sequentially arranged between a finishing mill group and a coiling machine, the laminar cooling section comprises a first-stage laminar cooling mechanism, a second-stage laminar cooling mechanism and a third-stage laminar cooling mechanism which are arranged in sequence; and an infrared imager for monitoring the transverse temperature of the strip steel in real time is arranged at the upstream of each stage of laminar cooling mechanism. Each stage of laminar cooling mechanism comprises four rows of cooling headers arranged side by side, one end of each cooling header is connected with a cooling water supply pipe, the other end of each cooling header is connected with two columns of gooseneck pipes, the gooseneck pipes are evenly distributed in the width direction of the low-carbon strip steel, the adjacent columns of gooseneck pipes are arranged in a staggered mode, and each gooseneck pipe is provided with an electric valve with the adjustable opening degree.

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 a control method for improving automobile beam steel coiling temperature setting precision, and belongs to the technical field of hot continuous rolling plate production methods. According to the technical scheme, strip steel parameters under different cooling processes are independently set, a CTC model selects a corresponding model parameter table according to laminar cooling codes, the same steel type is controlled by applying the independent model table when the cooling processes are different, and mutual interference of model setting and self-learning is avoided. The method has the beneficial effects that the effect is remarkable, the problem of large strip steel coiling temperature control deviation caused by different cooling processes is solved, and the occurrence of product degradation quality accidents caused by the transformation of the girder steel cooling process is avoided.

The invention relates to the technical field of steel rolling, and discloses a Q355B steel hot rolling process optimization method based on dynamic temperature control, which comprises the following steps: blank pretreatment, dynamic heating control, high-pressure water descaling, rough rolling process, finish rolling process, laminar cooling and coiling process. According to the method, a collaborative system of multi-section variable-temperature heating and intelligent temperature control is constructed, temperature distribution in a furnace and the heating rate are monitored and dynamically adjusted in real time, it is guaranteed that the core surface temperature of a plate blank is uniform and consistent, thermal stress and the internal crack tendency in the heating process are eliminated, and a high-temperature blank uniform in structure and stable in performance is provided for follow-up rolling; meanwhile, the high-pressure water descaling system optimizes jet flow parameters and introduces chemical additives, so that a protective layer is formed while oxide scales on the surface are removed, the surface cleanliness and quality of the plate blank are improved, and product defects caused by incomplete descaling and surface damage are avoided.

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 discloses hot rolled steel for a 500MPa-grade high-ductility hollow anchor rod welded pipe as well as a preparation method and application of the hot rolled steel, and belongs to the technical field of hot continuous rolling plate strip production. The hot rolled steel for the 500MPa-grade high-ductility hollow anchor rod welded pipe is prepared through smelting, casting blank heating, rough rolling, coiling of a hot coiling box, finish rolling, laminar cooling and coiling. The yield strength is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 600 MPa, the percentage elongation after fracture is larger than or equal to 26%, and the maximum force percentage elongation is larger than or equal to 14%. The hot rolled steel is subjected to the machining procedures of heating of a high-frequency electric heating device, three-roller spinning equal-diameter rolling, online heat treatment, saw cutting and slow cooling of a cooling bed, and a hollow anchor rod body is obtained; the yield force is larger than or equal to 150 kN, the tensile resistance is larger than or equal to 200 kN, and the maximum force elongation is larger than or equal to 6%. The method can effectively solve the problem that the ductility of the hollow anchor rod body prepared after heat treatment is poor due to the fact that existing anchor rod steel cannot have strength and ductility at the same time.

The invention discloses a rolling treatment process for one-step forming of w-shaped hinge section steel, and particularly relates to the technical field of rolling treatment processes, which comprises the following steps: S1, heating; s2, descaling is carried out; s3, rolling is conducted; s4, cooling; s5, straightening; s6, saw cutting; and S7, quality inspection. According to the rolling treatment technology for one-time forming of the W-shaped hinge section steel, the efficient production process can be achieved, the procedures from heating, descaling, rolling to cooling are closely connected, the automation degree is high, the production period is greatly shortened, the production efficiency is improved, and the production cost is reduced. Meanwhile, strict quality control measures are taken in each key step, such as a computer temperature control and pulse combustion technology in a heating process, a high-pressure system and optimized parameters in a descaling process, precise equipment and precise control in a rolling stage, and a three-section laminar cooling process in a cooling link. Therefore, the dimensional accuracy and the cross section shape of the product are ensured.

The invention relates to a control method for preventing a medium carbon steel hot-rolled coil from being flattened. The control method comprises the following steps: 1) hot charging and hot delivery of a continuous casting billet; (2) putting a heat preservation cover and an edge heater into the middle roller way; (3) the laminar flow roller way and the coiling machine rotate at the set advance rate; 4) controlling the head temperature of the strip steel before coiling, and performing laminar cooling to shield the edge part; (5) after the coiling machine builds tension, constant tension needs to be formed between a coiling block and a finish rolling tail rack; (6) covering and coiling in a coiling machine after coiling; and (7) the steel coils are placed on the flat coil prevention steel coil frame after entering the coil warehouse, are stored in a single layer and are prevented from being placed at a ventilation position, and impact on the steel coils is avoided during hoisting. The technical process is optimized and improved, the measures that the temperature of a rolled piece is kept consistent as much as possible, it is guaranteed that a steel coil is not loosened after being coiled, the influence of expansion generated by phase change of the steel coil on interlayer gaps is reduced, and the shape of the steel coil is fixed to prevent the flat coil from being aggravated are taken, so that the flat coil rate is greatly reduced.

The invention relates to low-cost high-toughness super-thick specification 450 MPa-grade marine pipeline steel. A hot-rolled coiled plate comprises the following chemical components in percentage by mass: 0.040-0.080% of C, 1.10-1.30% of Mn, 0.07-0.25% of Si, less than or equal to 0.0020% of S, less than or equal to 0.015% of P, 0.010-0.030% of Ti, 0.025-0.050% of Nb, 0.20-0.30% of Cr, less than or equal to 0.0005% of B, less than or equal to 1.5 ppm of H, less than or equal to 50 ppm of N and the balance of Fe and inevitable impurities. The production method comprises the working procedures of converter smelting, LF + RH refining, continuous casting, heating, rolling, ultra-fast cooling + laminar cooling and coiling. Low-carbon, manganese and niobium composite microalloying is utilized, medium-carbon ferromanganese is adopted to replace metal manganese, the low heating temperature is matched with the low-pressure ultra-fast cooling and layer cooling process, and the material cost is reduced on the premise that the performance of the ultra-thick steel strip is guaranteed.

The invention discloses a method for improving preset control precision of a hot rolling laminar cooling model. The method comprises the following steps: acquiring historical strip steel data from a strip steel data buffer area; the target data of the historical strip steel data is compared with the target data of the current to-be-rolled strip steel, and if the similarity of the target data is higher than a first similarity threshold value, the next step is executed; the actually measured data of the historical strip steel data are compared with the target data, and if the absolute value of the difference value is within the preset difference value range, the next step is executed; the historical strip steel data are stored in the similar steel grade array, and when the strip steel block count value is smaller than the preset number, the first step is executed again; and averaging the historical strip steel data of the preset number of similar steel types as a preset parameter of the current to-be-rolled strip steel. The method can improve the coiling temperature hit rate of the head strip steel and improve the performance stability of the strip steel, so that the qualification rate of strip steel products is improved. The invention further discloses a system for improving the preset control precision of the hot rolling laminar cooling model.

The invention relates to a method for improving the surface quality of hot-rolled commercial wheel steel, and belongs to the technical field of steel rolling and wheel steel manufacturing. The method comprises the steps that a casting blank with set chemical components is obtained, and the set chemical components comprise Ti and B; heating the casting blank, and controlling the following parameters of heating: steel charging temperature, steel tapping temperature, heating rate of a preheating section and heating rate of a heating section so as to reduce the heating stress of the surface layer of the casting blank; and the heated casting blank is sequentially subjected to rough rolling, finish rolling, laminar cooling and coiling, the rolling mode of rough rolling and the rolling reduction rate of each pass are controlled, and the commercial wheel steel is obtained. By optimizing the component design, the heating process and the rolling process, the surface quality of the commercial wheel steel is remarkably improved, and the skin warping defect is effectively overcome.

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 invention relates to a manufacturing method of a duplex stainless steel and carbon steel asymmetrically rolled composite plate. Stainless steel is any one of duplex stainless steel. The medium carbon steel is any one of plain carbon steel, low-carbon steel and alloy steel. The manufacturing method of the asymmetric composite blank of the duplex stainless steel and the carbon steel comprises the following steps: 1, preparing raw materials for assembling the blank; 2, pretreating the stainless steel middle plate; and 3, surface treatment of the assembly raw material. And 4, cleaning. And 5, assembling. And 6, vacuum chamber electron beam seal welding. And 7, composite blank welding seam detection. And 8, heating the composite blank. And 9, rolling the composite plate. And 10, laminar cooling. And 11, the composite blank has no cracking phenomenon in the heating and rolling processes, the interface shear strength tau after hot rolling is larger than or equal to 280 MPa, the interface bonding rate is 100%, the bonding performance is good, and the proportion of dual-phase steel ferrite is 40-60%.

The invention discloses a hot-rolled weather-resistant steel plate for a road guardrail and a preparation method of the hot-rolled weather-resistant steel plate, and belongs to the technical field of weather-resistant steel. According to the hot-rolled weather-resistant steel plate for the road guardrail and the preparation method of the hot-rolled weather-resistant steel plate, by reasonably designing alloy components and matching with heating, rough rolling, finish rolling, laminar cooling and coiling processes, the contradiction between high strength and high plasticity is solved, industrial production of the hot-rolled weather-resistant steel plate for the road guardrail with the thickness of 2.5-4.0 mm is achieved, the yield strength of the hot-rolled weather-resistant steel plate is larger than or equal to 500 MPa, and the tensile strength of the hot-rolled weather-resistant steel plate is larger than or equal to 100 MPa. The tensile strength is larger than or equal to 600 MPa, the percentage elongation after fracture is larger than or equal to 30%, the 180-degree bending test D is equal to a, the corrosion resistance index I reaches 5.5-6.7, and the energy consumption of a single-section guardrail can be larger than or equal to 7.92 * 10 < 5 > J, so that lightweight application can be achieved, and the safety of the guardrail is guaranteed.

The application discloses a low-carbon-equivalent 355MPa grade normalized rolled thick plate organization uniformity control method, wherein the temperature of the billet before charging is less than or equal to 400 DEG C, the temperature of the soaking furnace is 1130-1150 DEG C, the time of the soaking section is 45-55 minutes, the total furnace time is 170-185 minutes, the second opening temperature of the billet is 880-940 DEG C, the finishing rolling is 6-8 passes, the cumulative reduction is 60-70%, and the final rolling temperature is 860-900 DEG C; the steel plate cooling is realized by adopting a laminar flow cooling system, the full-automatic water pouring control cooling mode is adopted, the water inlet temperature is 720-740 DEG C, the red temperature is 640-660 DEG C, and the surface temperature of the steel plate after cooling is monitored. The head and tail and the full-thickness organization type of the normalized rolled steel plate are all 'ferrite + pearlite' organizations, the grain size level is all above 9.0, there is no obvious banded structure and no bainite structure, and the problem of the organization difference of the 355MPa grade thick plate product caused by the normalized rolling is solved.

The invention belongs to the technical field of pipeline steel production, and discloses a hot continuous rolling production method of Mo and Ni-free X70M pipeline steel, which comprises the processes of slab heating, rough rolling, finish rolling, laminar cooling and coiling, and the pipeline steel comprises the following chemical components in percentage by mass: 0.060 to 0.090 percent of C, 0.10 to 0.25 percent of Si, 1.50 to 1.70 percent of Mn, 0.20 to 0.30 percent of Cr, 0.045 to 0.070 percent of Nb, 0.020 to 0.050 percent of Al, less than or equal to 0.005 percent of S, less than or equal to 0.012 percent of P, 0.020 to 0.030 percent of Ti, less than or equal to 0.0050 percent of N and the balance of Fe and inevitable impurities. According to the pipeline steel, Mo and Ni are not added, the alloy cost is extremely low, meanwhile, a hot rolled steel strip of the pipeline steel has good low-temperature tearing resistance and low yield ratio, and the safety in the pipeline service process can be guaranteed.

The invention discloses a process for improving a longitudinal shearing camber of QSTE650TM girder steel. The process comprises the steps of plate blank preparation, rolling and cooling, straightening treatment and longitudinal shearing machining. In the slab preparation step, the length of a slab is shortened to 8.5-9 m; in the rolling and cooling step, a plate blank is subjected to rough rolling and finish rolling firstly, and strip steel obtained after finish rolling is cooled; in the cooling process, air cooling is firstly carried out to 880-900 DEG C, then laminar cooling is carried out, the laminar cooling rate is 20-25 DEG C / s, and the final cooling temperature is 550-580 DEG C; the straightening treatment step comprises a rough straightening process and a fine straightening process; in the rough straightening process, the pressure of a rough straightening machine is 18-20 MPa; in the fine straightening process, the fine straightening insertion amount is controlled to be 30%-45% of the thickness of the strip steel, and the pressure of a fine straightening machine is 8-10 MPa; in the slitting processing step, the blade gap of a slitting machine is controlled to be 0.15-0.2 mm, and the winding tension is controlled to be 120-150N / mm. According to the method, the camber degree of the QSTE650TM girder steel after longitudinal shearing is systematically reduced, and the camber degree of the QSTE650TM girder steel is controlled within 3 mm.

The steel comprises the following chemical components in percentage by weight: 0.083 to 0.103 percent of C, 0.41 to 0.59 percent of Si, 0.98 to 1.19 percent of Mn, 0.092 to 0.106 percent of P, less than or equal to 0.006 percent of S, 0.62 to 0.86 percent of Cr, 0.18 to 0.26 percent of Cu, 0.098 to 0.117 percent of Sb, 0.048 to 0.063 percent of Ti, 0.23 to 0.35 percent of Mo, 0.0144 to 0.0164 percent of Ce and 0.048 to 0.068 percent of Als, wherein P / Ce is 6.3 to 6.5 percent, and Si / Mo is 1.1 to 2.6 percent. The manufacturing method comprises the steps of smelting, slab continuous casting, casting blank heating, rolling, laminar cooling and coiling. The Rel of the steel ranges from 721 MPa to 733 MPa, the Rm of the steel ranges from 788 MPa to 808 MPa, and A of the steel is larger than 29%; the surface hardness of the steel ranges from 234 HBW to 241 HBW, the wear rate relative to Q345B ranges from 26.4% to 27.1%, the corrosion rate relative to Q345B ranges from 28.62% to 30.83%, and the problem that in the prior art, wear resistance is not achieved is solved.

The invention provides a tin plate wide steel strip and a preparation method thereof, and relates to the technical field of steel production, the method comprises the following steps: carrying out heat treatment on a continuous casting billet, and then carrying out hot continuous rolling treatment to obtain an initial steel strip; wherein the rolling reduction of the continuous casting billet in the rough rolling treatment process accounts for more than 75% of the total rolling reduction of the continuous casting billet; 6 passes of rough rolling and 7 passes of finish rolling are carried out in the rough rolling treatment process, the single-pass reduction rate of the first 3 passes of rough rolling is 17% or above, the single-pass reduction rate of the last 3 passes of rough rolling is 27% or above, and the single-pass reduction rate of the first 4 passes of finish rolling is 30% or above; the initial steel strip is subjected to laminar cooling to the coiling temperature and then is coiled, and the wide steel strip of the tin-plated plate is obtained; wherein the laminar cooling speed is 10 DEG C / s or above, and the coiling temperature ranges from 560 DEG C to 600 DEG C. The wide steel strip of the tin-plated plate prepared by the method disclosed by the invention is relatively uniform in structure and mechanical property, and the steel strip is not easy to deviate in the cold rolling process.

The invention belongs to the technical field of stainless steel hot working, and discloses a martensitic stainless steel hot rolled steel coil manufacturing method capable of solving the edge crack problem in the wide rolling process so as to improve the yield. Comprising the steps that firstly, a continuous casting slab is heated for the first time in a heating furnace, the temperature of a heating section is 1100-1150 DEG C, the temperature of a soaking section is 1150-1200 DEG C, the heat preservation time of the soaking section is (1.00-1.25) t min, and t is the actually measured thickness mm of the slab before the slab enters the furnace; secondly, the heated continuous casting sheet billet is rolled into an intermediate billet through a roughing rolling unit, and the outlet temperature of the roughing rolling unit is 1000-1010 DEG C; 3, returning the intermediate billet to the heating furnace for secondary heating, wherein the heat preservation time of a soaking section of the secondary heating is shorter than that of the primary heating; fourthly, the intermediate billet heated for the second time is fed into a roughing rolling unit to be rolled, and the outlet temperature of the roughing rolling unit is 1000-1010 DEG C; 5, putting into a hot coil box after rolling; sixthly, the steel plate is fed into a finishing mill group to be rolled to the target thickness, and the finish rolling temperature is 1000-1050 DEG C; and 7, after finish rolling, laminar cooling is conducted to 300-400 DEG C, and then coiling is conducted.

The invention relates to a production method of high-grade non-oriented silicon steel hot-rolled strip steel, and belongs to the technical field of steel preparation. The method comprises the following steps: carrying out heating treatment on a non-oriented silicon steel continuous casting sheet billet containing specific alloy components, and controlling the tapping temperature of the heating treatment to be a set tapping temperature; carrying out rough rolling on the heated non-oriented silicon steel continuous casting sheet billet to obtain an intermediate billet; the intermediate billet is subjected to finish rolling, and hot-rolled strip steel is obtained; and the hot-rolled strip steel is subjected to laminar cooling, coiling, heat preservation and edge cutting, and the high-grade non-oriented silicon steel hot-rolled strip steel is obtained. Key process parameters of each hot rolling process are accurately controlled, and batch stable production of the high-grade non-oriented silicon steel with high silicon and high nickel alloy components is realized. According to the method, the edge qualification rate and the yield are increased, the harsh requirements of users for the material performance, the size and the strength are met, and key material support is provided for strategic emerging industries such as new energy automobiles and unmanned aerial vehicles.

The invention relates to an automotive frame steel plate with tensile strength of 750MPa and a hot rolling control method thereof, and belongs to the technical field of iron-based alloys. The steel plate comprises the following chemical components in percentage by mass: 0.05-0.08% of C, 0.1-0.3% of Si, 1.7-2.0% of Mn, less than or equal to 0.025% of P, less than or equal to 0.0030% of S, 0.05-0.1% of Ti, 0.04-0.08% of Nb, less than or equal to 0.0060% of N, 0.02-0.06% of Al, 0.3-0.7% of Mo, less than or equal to 0.0050% of Ca and the balance of iron and inevitable impurities. During hot rolling, the continuous casting sheet billet is controlled to be heated to 1250-1350 DEG C and then rolled, the rough rolling finish rolling temperature is 1050-1000 DEG C, the finish rolling finish rolling temperature is 880-900 DEG C, the reduction rate is larger than or equal to 60%, laminar cooling after rolling adopts front-section cooling, the cooling speed is 40-50 DEG C / s, and a hot rolled steel coil is obtained through coiling when the coiling temperature is 600-650 DEG C. Through proper chemical component design and hot rolling process condition control, the high-strength hot-rolled acid-washed automobile beam steel plate with the yield strength of 700-800 MPa and the tensile strength of 770-850 MPa is obtained.

The easy-to-form high-strength wear-resistant corrosion-resistant steel comprises the following chemical components: 0.058 to 0.076 percent of C, 0.81 to 0.97 percent of Si, 1.26 to 1.46 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.006 percent of S, 0.82 to 1.03 percent of Cr, 0.13 to 0.28 percent of Cu, 0.051 to 0.071 percent of Mo, 0.078 to 0.098 percent of Al, 0.0122 to 0.0138 percent of RE, 0.018 to 0.028 percent of V, 0.031 to 0.046 percent of Ti, 0.059 to 0.079 percent of W, 0.036 to 0.054 percent of Sn, more than or equal to 0.90 percent and less than 1.1 percent of Si + Al + RE, and more than 9.5 percent and less than 11.2 percent of Si / Al. The manufacturing method comprises the steps of pre-desulfurization, converter steelmaking, external refining, slab continuous casting heating, hot continuous rolling, laminar cooling and coiling. The thickness of the steel plate is 6.5-13.5 mm, ReL is larger than 550 MPa, Rm is larger than 730 MPa, A is larger than 32%, the yield ratio is smaller than 0.80, KV2 at-40 DEG C is larger than or equal to 107 J, and the acid environment corrosion rate is smaller than 0.68 g / m < 2 >. H. The high-strength steel has corrosion resistance, wear resistance and excellent formability, and has obvious competitive advantages in the field of high-strength steel for railway vehicles.

A super high strength beam steel with excellent plate shape and yield strength ≥1000MPa, the chemical composition and wt% of which are: C: 0.03-0.12%, Si: 0.15-0.25%, Mn: 1.00-1.40%, V: 0.01-0.02%, Cr: 0.1-0.2%, P: ≤0.015%, S: ≤0.002%, B: 0.0015-0.0020%, Als: 0.02-0.10%; production method: casting into billets after smelting; heating the billets; hot rolling after descaling; laminar cooling; coiling; quenching; annealing; cooling in the furnace to ≤100°C and taking out of the furnace. The invention not only has excellent plate shape quality, but also has yield strength ≥1000MPa, tensile strength ≥1100MPa, elongation ≥12%, unevenness ≤1mm / m, and relatively simple chemical composition.

The invention discloses a hot-rolled strip steel cross crease control method which comprises the following steps: S1, a heating procedure: heating a plate blank by adopting a heating furnace, and controlling the temperature of the upper surface of the plate blank to be 20-25 DEG C higher than the temperature of the lower surface of the plate blank in a soaking section; s2, a rough rolling procedure, wherein a rough rolling machine is adopted for rolling the heated plate blank into an intermediate blank, and a rough rolling outlet intermediate roller way is put into a heat preservation cover; a finishing mill is adopted for rolling the intermediate billet into finished strip steel, cooling water between racks of the finishing mill and reverse water spraying between the racks are controlled, and the final rolling temperature set value meets the condition that the final rolling temperature is higher than the ferrite transformation temperature; and S4, the cooling and coiling procedure is conducted, specifically, strip steel is cooled to the coiling temperature through laminar cooling and coiled into coils, front-section cooling is used as the cooling mode, and the flow of an upper collecting pipe and a lower collecting pipe of laminar cooling of each section is controlled. The method can effectively eliminate the problem of cross creases caused by the temperature difference between the upper surface and the lower surface of the rolled piece, and plays a positive role in reducing the cost of production procedures; the method has the advantages of good cross crease eliminating effect, easiness in control, low cost and the like.

The application provides a production method for improving the width direction performance stability of 800MPa grade complex phase steel and 800MPa grade complex phase steel produced by the method. In the production, the use of a width setting machine increases the edge deformation and promotes the grain structure of the edge to be more refined. The optimization of the water use strategy between the stands reduces the width direction temperature unevenness during the finishing rolling. The laminar flow cooling front section fast cooling technology is used to quickly cool the strip steel to the coiling target temperature, reduce the residence time of the strip steel in the water environment, and reduce the edge temperature drop during the period. The precise control laminar flow cooling edge shielding amount technology is used to make the edge of the strip product of different widths naturally flow through the cooling of the middle area cooling water, improve the edge temperature of the strip, and reduce the difference between the edge and the middle of the strip in the laminar flow cooling and the hot coiling cooling in the structure and performance. The product width direction tensile strength range is less than or equal to 35MPa, and the strength low point is greater than or equal to 815MPa.