51 results about "Austenite grain" patented technology

This invention provides an alloyed hot-dip galvanized steel sheet with a tensile strength of 590 MPa or higher, excellent ductility and microcrack resistance, comprising a steel plate and an alloyed hot-dip galvanized layer. The steel sheet has a carbon equivalent (Ceq) of 0.370 or higher and less than 0.520, and a total Nb and Ti content of 0.010 to 0.080% by mass. At one-quarter of the plate thickness, the martensite area fraction is 5 to 30%. From the surface of the steel sheet to a depth of 20 μm, the martensite area fraction is 5 to 30%, the original austenite grain size is 3.0 μm or less (martensite area fraction 50% or higher), and the total Nb and Ti content in precipitates smaller than 100 nm is 50 ppm by mass or more, while the total Nb and Ti content in precipitates larger than 100 nm is 350 ppm by mass or less. Within a range from the surface of the steel plate to a depth of 1 μm, the long sides of the Si and Mn oxides present at the grain boundaries are less than 200 nm.

This invention discloses a thick-gauge bridge weathering steel with a compression ratio of less than 2.5 and its production method, belonging to the field of metallurgical technology. Addressing the problems of poor toughness and unsatisfactory flaw detection performance in thick-gauge bridge weathering steel with a compression ratio of less than 2.5, a synergistic process is adopted: "one-stage high-temperature high-reduction rolling + intermediate laminar flow rapid cooling to 900-950℃ + two-stage controlled rolling in the non-recrystallization zone + quenching and tempering heat treatment." The first-stage high reduction ensures core welding; the intermediate rapid cooling inhibits austenite grain growth and creates low-temperature conditions for finishing rolling; combined with quenching and tempering heat treatment, the microstructure is optimized. The resulting 60-75mm thick steel plate has a yield strength ≥400MPa, tensile strength ≥500MPa, elongation ≥25%, impact energy at -40℃ ≥200J, and ultrasonic flaw detection level II pass rate ≥95%, achieving a balance of high strength, high toughness, and high flaw detection pass rate at a low compression ratio.

Provided are a steel sheet and a member, having high strength and high delayed fracture resistance, and methods for manufacturing the steel sheet and the member. The steel sheet has a specific chemical composition and a microstructure in which the area fraction of martensite is 95% to 100%, with the balance being one or more of bainite, ferrite, and retained austenite. In the steel sheet, prior-austenite grains have an average grain size of 18 μm or less, 90 mass % or more of the total content of Nb and Ti contained is present as a carbonitride having an equivalent circular diameter of 100 nm or more, and a Nb carbonitride and a Ti carbonitride, having an equivalent circular diameter of 1.0 μm or more, are present at a rate of 800 pieces / mm2 or less in total. The steel sheet has a tensile strength of 1310 MPa or more.

This invention discloses a method for improving the performance of Q690C steel used in tunnel pre-embedded components. Through microalloying and strict desulfurization and deoxidation during the steelmaking stage, controlling the final rolling temperature of hot rolling / forging (820-880℃), combined with differential zone controlled cooling (7-10℃ / s in thin zones, 3.0-4.2℃ / s in thick zones) and uniform isothermal short-stop (330-350℃×10-15 min), deep cooling after quenching (-80 to -100℃×20-40 min), and two-stage tempering (420-480℃ and 200-260℃), a refined prior-austenite grain, uniform lower bainite / tempered martensite, and nano-precipitate composite microstructure is formed. Its -40℃ impact energy reaches 128-155J, CGHAZ grain size is 6-10μm, retained austenite ≤2.5%, and the toughness, corrosion resistance, and fatigue life of welded joints are significantly improved.

This steel sheet is characterized by having a desired chemical composition, wherein: at a position corresponding to 1 / 4 of the sheet thickness, the average value of the aspect ratios of prior austenite grains is 3.0-10.0, the area ratio of bainite is 70-95%, the total area ratio of martensite and retained austenite is 5-30%, the area ratio of pearlite is less than 5%, and the area ratio of ferrite is at most 15%; and in a surface layer region, the average value of the equivalent circle diameters of martensite and retained austenite is at most 3.0 μm, and the area ratio of ferrite is at least 10%. This component is manufactured using said steel sheet.

Provided is a hot stamped body having a chemical composition comprising, by mass %, C: 0.40 to 0.70%, P: 0.100% or less, S: 0.0100% or less, N: 0.0200% or less, O: 0.0200% or less, Al: 0.0010 to 0.500%, Nb: 0.0010 to 0.100%, Ti: 0.010 to 0.200%, Mo: 0.010 to 2.000%, B: 0.0005 to 0.0200%, etc., and balance of Fe and impurities, and a microstructure with a total amount of segregation of at least one of Mo, W, Ta, Re, Os, Ir, and Tc at prior austenite grain boundaries of 0.10 atm % or more.

This invention relates to the field of profiled tube rolling technology, and particularly to a heating method for large rectangular 42CrMo billets used in engineering machinery. The method includes a preheating section: the cold billet enters the preheating section at a temperature ≤720℃ for 1.5–1.8 hours; a heating section: the temperature is 950–1100℃ for 3.0–3.5 hours; and a soaking section: the temperature is 1160–1240℃ for 2.0–2.2 hours. This invention achieves 100% austenitization of the billet core, no surface cracks after rolling, and a decarburized layer thickness ≤0.2mm by precisely designing the temperature, time, and atmosphere parameters of the preheating, heating, and soaking sections, while simultaneously controlling the austenite grain size to level 5–8.

This invention discloses a hollow wind turbine main shaft and its near-net-shape forming method by die forging, which relates to the field of wind turbine main shaft manufacturing. The hollow wind turbine main shaft comprises, by mass percentage, C: 0.16%~0.20%, Si: 0.30%~0.50%, Mn: 1.30%~1.60%, Nb: 0.020%~0.040%, V: 0.050%~0.120%, Ti: 0.010%~0.025%, Als: 0.015%~0.035%, and N: 0.012%~0.020%, where Als and N satisfy Als-0.5×N≥0.008% and Als-1.2×N≤0.025%, Nb / Ti=1.2~2.5, and Nb / V=0.3~0.6, forming a continuous precipitation sequence of AlN and (Nb,Ti,V)(C,N) pinning austenite grain boundaries; its microstructure contains ferrite phase with a volume fraction ≥15% {100} <110> Orientation components and ≤8% {111} <112> The orientation component, carbonitride 1, exhibits a non-uniform distribution with a grain boundary number density 1.5 to 3.0 times that of the intragranular region. The die forging method involves continuously cast round billets, upsetting and drawing, prefabrication of blind hole inner flanges, octagonal material distribution, outer flange die forging, and cylinder drawing and finishing. The distribution of precipitates is controlled through a four-stage process and a holding pressure of 5 to 15 seconds.

The present application relates to the technical field of metal material heat treatment, in particular to a method for dynamically regulating hardness and toughness of heat treatment matching of silver-containing martensitic antibacterial stainless steel, comprising: placing an original workpiece in a program heating furnace, sequentially completing austenitizing through constant rate preheating, higher rate rapid heating and super-temperature pulse stage, using inert gas to rapidly cool to below the martensite starting transformation temperature after the super-temperature pulse, obtaining a non-equilibrium supersaturated matrix initial quenching organization, then carrying out isothermal tempering treatment to obtain an intermediate tempering organization, and then carrying out secondary quenching and final tempering. The method can accurately regulate the matrix organization and silver phase distribution, refine the austenite grains, improve the internal stress distribution, realize the collaborative adaptation of hardness and toughness, and improve the uniformity of the silver-containing martensitic antibacterial stainless steel organization and the stability of the mechanical properties.

This invention relates to a method for measuring the austenite grain size of steel. For steel with a carbon content of 0.35-0.45%, a thermal simulation testing machine is used to heat the steel to 850-1200℃ and hold it for 10-60 minutes. The cooling rate is precisely controlled, with the round bar cooled to room temperature at a rate of 5-15℃ / s. The resulting sample forms a uniform network of ferrite, clearly and accurately revealing the austenite grains. This invention can accurately measure the austenite grain size and has high reproducibility, meeting the needs of scientific research and production guidance.

The present application relates to the technical field of high-performance die steel material, and particularly relates to a high-performance die steel and a manufacturing method, Sn, Ba and Zn are added in the die steel, through the synergistic effect of Sn, Ba and Zn, the effect of inhibiting carbide coarsening and reducing residual stress are balanced, meanwhile, through nitrogen and niobium composite micro-alloying, the grain is further refined, the thermal stability and strength are improved, a higher-performance die steel is formed, Nb(C, N) is precipitated in the rolling process, the grain boundary is strongly pinned, the austenite grain growth is inhibited, the carbonitride such as stable NbC, NbN and VN is difficult to coarsen and dissolve at high temperature, can long-term pin the grain boundary and dislocation, by adjusting the N content, the strength and wear resistance of the material can be 'customized' in a certain range, a higher-performance die steel is formed.

One objective is to provide a high-strength steel sheet having a tensile strength of 980 MPa or more and excellent formability, and a method for manufacturing the high-strength steel sheet. A high-strength steel sheet with a predetermined chemical composition is provided and manufactured under optimum conditions. The high-strength steel sheet has a steel microstructure that includes, by area, ferrite: 30% or more and 80% or less, martensite: 5% or more and 35% or less, and retained austenite: 8% or more, wherein the ratio of the grain area fraction of retained austenite, grains having an aspect ratio of 2.0 or more and a minor axis length of 1µm or less, divided by the total area fraction of retained austenite is 0.3 or more, wherein the ratio of the average Mn content (% by mass) in the retained austenite divided by the average Mn content (% by mass) in the ferrite is 1.5 or more, and the product of the ratio of the average Mn content (% by mass) in the retained austenite divided by the average Mn content (% by mass) in the ferrite and the average aspect ratio of the retained austenite is 3.0 or more, the ratio of the average C content (% by mass) in the retained austenite divided by the average C content (% by mass) in the ferrite is 3.0 or more, and wherein the ratio of the average C content (% by mass) in the retained austenite divided by the average Mn content (% by mass) in the retained austenite is 0.05 or more.

This invention discloses a heat treatment process for controlling grain size and microstructure uniformity in austenitic stainless steel. It is applied to 00Cr20Ni15Mn5Mo3N austenitic stainless steel with diameters of 100mm-400mm and lengths of 2000mm-5000mm. Through a limited-rate heating design combined with segmented medium-temperature holding, long-term holding at three key temperature points before the final solution temperature of 1065℃ allows for the dissolution and diffusion of carbides, nitrides, and intermetallic compounds such as the σ phase in the original microstructure, preventing damage during rapid heating. During the process, local overheating leads to grain growth, resulting in austenite grain size that is 2-3 grades higher than that of traditional processes. The staged holding provides sufficient time and energy for the diffusion of alloying elements, ensuring their uniform distribution in the austenite matrix, eliminating microscale compositional segregation, and improving material uniformity. The stepped heating process is an efficient stress relaxation process. Holding at 450℃ and 650℃ for extended periods can eliminate residual stress, improve workpiece dimensional stability, and effectively improve the phenomena of grain coarsening, uneven microstructure, and compositional segregation in the material.

This invention provides a high-strength steel plate with excellent tensile flange properties, bending and LME resistance, and capable of manufacturing parts with high dimensional accuracy. The high-strength steel plate of the present invention has the following composition: it contains C, Si, Mn, P, S, Al, N, Nb, Ti and B in specified amounts, such that [%Si] / [%Mn] is 0.10 to 0.60, the amount of free Ti is 0.001% by mass or more, and the remainder is composed of Fe and unavoidable impurities; it has the following steel structure: the total amount of Nb dissolved in the surface layer and the amount of precipitation below 100 nm is 0.002% by mass or more, at the 1 / 4 position of the plate thickness, the area fraction of martensite is 78% or more, the area fraction of ferrite is 10% or less, the volume fraction of retained austenite is less than 10.0%, the ratio of the grain size in the rolling direction to the grain size in the thickness direction of the original austenite grains is 2.0 or less, and the hardness variation frequency per 1500 μm in the width direction at the 200 μm position of the plate thickness is 10 times or less; and the high-strength steel plate has a tensile strength of 1180 MPa or more.

A method for predicting the austenite grain size of cold-extruded gear steel after carburizing belongs to the field of metal material testing technology. The method mainly includes the following steps: taking samples from hot-rolled round steel and processing them into specimens of specified dimensions; normalizing the specimens; then performing spheroidizing annealing; cold-heading the spheroidized annealed specimens; then performing pseudo-carburizing treatment; finally, preparing the specimens into metallographic samples, etching them with picric acid aqueous solution, and observing the grain size under a metallographic microscope. This invention, through a coupled process of heat treatment and cold heading deformation, can effectively detect the austenite grain size of cold-extruded gear steel after carburizing, directly characterizing the material's resistance to grain coarsening during the carburizing process after cold extrusion.

This invention provides a 12Cr2Mo1V steel cylindrical section forging and its preparation method, relating to the field of forging technology. By increasing the forging ratio in the final forging pass, this invention helps to refine the grains, thereby improving the internal structure of the forging, eliminating structural defects, and enhancing the strength and impact toughness of the forging. Through quenching and tempering the forging, and controlling the quenching temperature at a relatively low level, this invention retains some undissolved VC particles in the matrix, which can pin grain boundaries and inhibit austenite grain growth, thus improving the impact toughness of the cylindrical section forging. Furthermore, controlling the quenching temperature at a low level reduces the solid solution V content, lowering the risk of complex carbide precipitation along grain boundaries during subsequent cooling, which is beneficial for improving the strength of the cylindrical section forging. In summary, the 12Cr2Mo1V cylindrical section forging prepared using the method of this invention exhibits high strength and high impact toughness.

The application discloses a production method of high-strength and high-toughness gear steel without normalizing treatment. The gear steel adopts a Cr-Mn based hardenability system and is micro-alloyed by V, Nb and Al. The production process comprises smelting, continuous casting, controlled rolling and controlled cooling, and a key heat treatment process of directly slow cooling to quenching temperature after high-temperature carburizing. The V, Nb and Al carbonitrides pin the grain boundaries at high temperature, and inhibit the growth of austenite grains during the carburizing process. The application enables the gear steel to be directly quenched without normalizing treatment after high-temperature carburizing, and fine crystal structure and high comprehensive performance are obtained, so that the production process is greatly simplified, and the cost and energy consumption are reduced.

The present disclosure provides a method for regulating dynamic recrystallization of NiTi alloy by Ti2Ni phase, comprising: after open-die forging of the as-cast NiTi alloy, performing staged thermal mechanical treatment, first performing first-stage thermal deformation, then performing second-stage thermal deformation, and rapidly water cooling after deformation; by regulating the two-stage variable-temperature and variable-strain rate, Ti2Ni, which is originally considered as a harmful phase, is converted into a micro tool for controlling grain boundary migration; by using Ti2Ni to induce particle-induced nucleation in the low-temperature region, the critical strain required for complete recrystallization is reduced, and the limitation of traditional single thermal coupling driving is broken; this innovative mechanism not only promotes the occurrence of austenite grain dynamic recrystallization process by increasing nucleation sites, but also inhibits the organization coarsening caused by high-temperature grain boundary migration by using the pinning effect of the second phase particles, so as to realize the precise regulation of the uniformity of the organization under a lower deformation amount.

This invention provides a steel sheet that exhibits high tensile strength, excellent low-temperature toughness, corrosion resistance, and lamellar tear resistance, even without the need for reheating and quenching. [Solution] The steel sheet of this disclosure has the chemical composition described in the specification, with a Ceq defined by formula (1) described in the specification being 0.42 to 0.49, a SnEQ defined by formula (2) being 0.10 or more, an MV defined by formula (3) being 0.20 to 0.80, and an SC defined by formula (4) being 0.20 to 15.00, having a plate thickness of 75 to 105 mm, a tensile strength of 570 MPa or more, and the major axis D of the prior austenite grains in the center of the plate thickness of the L cross section. L 100 μm or less, aspect ratio AR L The ratio is greater than 2.0 and less than or equal to 3.0, and the major axis D of the prior austenite grains is at the center of the plate thickness of the C section. C 100 μm or less, aspect ratio AR C The Vickers hardness is greater than 2.0 and less than or equal to 2.5, the Vickers hardness in the segregation region at the center of the plate thickness of the C section is 250 HV or less, and the maximum length of porosity is 1.0 mm or less.

The application discloses a low-cost large-heat-input welding method for common high-strength steel, selects common high-strength steel plates with thickness of 20mm-120mm and tensile strength of 450-650MPa as base materials, firstly melts thin-layer weld metal in a groove by small-line-energy gas shielded welding, forms fine and dispersed inclusions in the weld by Ti, Si, Al and Mn oxides and MnS complex, and induces generation of slender acicular ferrite (AF) structure, and then completes welding by vertical gas-electric vertical welding with large heat input, so that the thin-layer weld metal is used as new heat affected zone (HAZ), the inclusions inhibit austenite grain growth, and the AF structure is transformed into equiaxed ferrite. The application can realize large-heat-input efficient welding of common high-strength steel without special large-heat-input welding steel, the low-temperature impact toughness of each region of the joint is excellent, the material cost is greatly reduced, the welding efficiency is improved, and the application is suitable for thick plate welding fields such as shipbuilding and offshore platform.

The objective is to provide a high-strength steel sheet having a yield strength greater than 0.70, a tensile strength of 980 MPa or more, and excellent formability, as well as a method for manufacturing the high-strength steel sheet. A high-strength steel sheet with a predetermined chemical composition is provided and manufactured under optimum conditions. The high-strength steel sheet has a steel microstructure that includes, by area, ferrite: 30% or more and 80% or less, tempered martensite: 3.0% or more and 35% or less, and retained austenite: 8% or more, wherein the ratio of the grain area fraction of retained austenite, grains having an aspect ratio of 2.0 or more and a minor axis length of 1 µm or less, divided by the total area fraction of retained austenite is 0.3 or more, wherein the ratio of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more, and the product of the ratio of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite and the average aspect ratio of the retained austenite is 3.0 or more, the ratio of the average C content (mass %) in the retained austenite divided by the average C content (mass %) in the ferrite is 3.0 or more, and wherein the ratio of the average C content (mass %) in the retained austenite divided by the average Mn content (mass %) in the retained austenite is 0.05 or more, and wherein the diffusible hydrogen content in the steel is 0.3 ppm in mass or less.

This invention discloses a multi-level heterogeneous Fe-Mn-Al-C-Ni high-strength and ductile austenitic low-density steel and its preparation method. The microstructure of the high-strength and ductile austenitic low-density steel is a composite structure composed of multi-peaked austenite and multi-morphological B2 phase. The austenite is composed of fine recrystallized grains and coarse unrecrystallized grains, forming a heterogeneous microstructure with alternating soft and hard phase regions. The B2 phase is distributed as polygonal particles within the grains and grain boundaries in the recrystallized austenite region, while it precipitates as needle-like morphology within the unrecrystallized austenite grains. This invention innovatively constructs a multi-level heterogeneous structural system of "grain size heterogeneity + precipitate phase heterogeneity," effectively solving the problem of the mutual constraint between strength and ductility in traditional low-density steel.

This component is formed from a steel plate having a specified chemical composition, wherein in a region at a depth of 1 / 8 of the plate thickness from the surface to 3 / 8 of the plate thickness from the surface, the average aspect ratio of the original austenite grains is 3.00 to 5.50, the area fraction of bainite is 70 to 95%, the area fraction of martensite is 5 to 30%, and the ratio of the total amount of Ti and Nb analyzed as electrolytic extraction residue at a depth of 1 / 60 of the plate thickness from the surface to the total amount of Ti and Nb analyzed as electrolytic extraction residue at a depth of 1 / 4 of the plate thickness from the surface is 1.5 or more.

The application provides a 120Mn13 high manganese steel square steel forge piece forging method, controls deformation temperature and deformation amount to expand a plastic deformation temperature range of the 120Mn13 high manganese steel square steel forge piece, reduces an edge crack tendency of the forge piece, improves surface quality, refines austenite grains, realizes a 120Mn13 high manganese steel square steel forge piece forging forming process, and comprises the following steps: 1) heating; 2) radial forging of round steel; 3) reheating; 4) radial forging of square steel; and 5) air cooling after forging. The method is simple and convenient to operate, does not need to add forging equipment, solves the problem that 120Mn13 high manganese steel cannot be forged due to poor hot workability, widens the content range of raw materials and the deformation temperature range of forging, reduces smelting difficulty and production cost of the raw materials, solves the internal porosity problem of the cast 120Mn13 high manganese steel, improves the metal compactness of the steel, improves the organization form, refines the austenite grains, improves the mechanical properties of the forge piece, shortens the production cycle, and improves the production efficiency.

This invention discloses a processing method for improving surface cracks in high-strength 316L stainless steel. The steps are as follows: S1, Product smelting: Low-sulfur raw materials are selected during the electric furnace charging stage. After electric furnace roughing, pre-desulfurization treatment, AOD refining, and calcium wire modification, the raw materials are sent to the continuous casting platform for casting to obtain slabs; S2, Slab surface grinding: The two surfaces of the slab are ground in two passes respectively; S3, Hot rolling: Rough rolling and fine rolling. This invention achieves the following: First, by increasing the chromium content, the slab maintains a reasonable ferrite content, preventing excessive austenite grain growth during electric furnace heating and smelting; second, by reducing the content of harmful elements oxygen and sulfur, the precipitation of sulfides between grains is reduced, improving intergranular bonding; third, the surface of the slab is ground to eliminate the poor quality parts of the slab surface; fourth, a hot rolling light pressing process is used to refine the surface grains of the slab. Through the above means, crack defects are avoided, and the surface quality of the final product is improved.

An un-heat treated cold rolled superplastic high manganese low density steel sheet comprising: 0.12% ≤ carbon ≤ 0.5%, 12% ≤ manganese ≤ 20%, 5% ≤ aluminum ≤ 9%, 0% ≤ silicon ≤ 2%, 0% ≤ phosphorous ≤ 0.1%, 0% ≤ sulfur ≤ 0.03%, 0% ≤ nitrogen ≤ 0.1%, 0 ≤ niobium ≤ 0.03%, 0 ≤ titanium ≤ 0.2%, 0% ≤ molybdenum ≤ 0.5%, 0% ≤ chromium ≤ 0.6%, 0% ≤ copper ≤ 2.0%, 0% ≤ nickel ≤ 3.0%, 0% ≤ calcium ≤ 0.005%, 0% ≤ boron ≤ 0.01%, 0% ≤ magnesium ≤ 0.005%, 0% ≤ zirconium ≤ 0.005%, 0% ≤ cerium ≤ 0.1%, the balance comprising iron and unavoidable impurities, said steel sheet having a microstructure comprising 45% to 90% ferrite and 10% to 55% austenite in area fraction, said austenite having an average grain size of 0.5 microns to 25 microns, and a residual austenite grain having an aspect ratio of 1 to 4.5.

The present invention provides a steel member having excellent wear resistance. A steel member having a prescribed composition, an average grain size of old austenite grains of 25 μm or less, carbides containing at least one of Nb, Ti, and V, and an average grain size of particles of 0.1 μm or more in the carbides of 0.15 to 2.5 μm, and an average grain size of particles of less than 0.1 μm in the carbides of 0.005 to 0.05 μm.

The application provides a spring steel and a production method and a heat treatment method thereof, and belongs to the technical field of spring steel.The application comprises the following components: Pr, La, C, Si, Mn, Cr, V, Al, P, S, O, Fe and other inevitable impurities, the plasticity index P of inclusions is controlled to be greater than or equal to 0.20, P=78.6* (%Pr)+29.5* (%La), the austenite grain size of the steel is finer than 9.5 levels, and the size of more than 95% of the inclusions is less than 8 microns; the austenitizing and isothermal partitioning heat treatment process is adopted; the structure is a nano-level structure; the nano-level bainite content is 60-80%; and a large number of dispersed fine carbide precipitated phases are accompanied; the product is higher than the general level spring steel in the market in the aspects of strength plasticity, fatigue performance and anti-bounce performance.

This invention provides a low-carbon, high-titanium, high-chromium steel thin slab and its production method. The chemical composition and mass percentage of the low-carbon, high-titanium, high-chromium steel thin slab are: 0.04wt%≤C≤0.065wt%, 0.1wt%≤Si≤0.3wt%, 0.4wt%≤Mn≤0.8wt%, 0.2wt%≤Cu≤0.4wt%, 0.07wt%≤Ti≤0.15wt%, 2wt%≤Cr≤3wt%, N≤0.008wt%, with the remainder being iron and other unavoidable impurities. Compared with existing technologies, its Ti content is 0.07-0.13wt%, the inclusion size is smaller, and the original austenite grains in the slab are finer, providing favorable conditions for the stable rolling of high-strength, ultra-thin hot-rolled coils. This method, while ensuring the quality of the low-carbon, high-titanium, high-chromium steel thin slab, shortens the production process, significantly reduces costs, and improves efficiency.