229 results about "Tool steel" patented technology

The invention relates to a 1200MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, after V-containing chemical components are designed, rolled and spun into a wire rod, the wire rod is subjected to online molten salt isothermal quenching treatment, and the wire rod is controlled to enter a bainite phase region from a high-temperature austenite state at a cooling speed greater than or equal to 32 DEG C / s; the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared through isothermal tempering, toughening and destressing treatment, carbide precipitation control and roller way cover opening and slow cooling, so that generation of deteriorated structures such as martensite can be avoided, the structure state can be effectively adjusted, strong plasticity matching of the steel wire rod is achieved, and the service life of the steel wire rod is prolonged. And the tensile strength is 1120-110MPa, the percentage reduction of area is 63-67%, and the steel is suitable for the application fields of manufacturing 1200MPa-grade high-strength tool steel and the like, and is favorable for being directly processed into tool parts after being subjected to cold processing molding.

The invention relates to a 1100MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a middle-carbon Nb-V-containing chemical component design, after a steel billet is rolled and spun into the wire rod according to the spinning temperature of more than or equal to 860 DEG C, online molten salt semi-quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment, and then the steel wire rod is subjected to hot rolling and hot rolling to obtain the 1100MPa-grade high-strength tool steel wire rod. According to the method, the steel wire rod enters a bainite phase region from a high-temperature austenite state at the cooling speed of more than or equal to 30 DEG C / s to form a structure taking quenched bainite as a main component, and then is subjected to rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally is subjected to roller way slow cooling to prepare the steel wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the material cost can be reduced, and the production efficiency is improved. The method has the advantages that martensite brittle structures are effectively avoided, the structure state of the hot-rolled wire rod is controlled, the plasticity and cold working performance of the wire rod are improved, the tensile strength of the product can reach 980-1030 MPa, the percentage reduction of area is 61%-66%, and the product can be directly machined into tool parts after cold forming.

The invention relates to a 1300 MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, after a Cr-Nb-V medium carbon component design is adopted for rolling and spinning to form a wire rod, the wire rod is subjected to online molten salt micro-quenching tempering treatment, the wire rod is controlled to enter a lower bainite phase region from a high-temperature austenite state at a cooling speed greater than or equal to 31 DEG C / s, and a quenching structure mainly comprising quenching bainite is formed; the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared by carrying out isothermal tempering and toughening destressing treatment on a quenched structure and finally carrying out roller way slow cooling, so that the material cost can be properly controlled, the strength and plasticity matching of the steel wire rod is improved, the tensile strength is 1255-1305MPa, and the percentage reduction of area is 58-63%, so that the steel wire rod can be directly processed into a part after being subjected to cold processing molding, and the service life of the steel wire rod is prolonged. And tool steel production energy consumption, cost reduction and efficiency improvement are facilitated.

The invention belongs to the technical field of steel performance intelligent analysis, and particularly relates to a high-strength and high-toughness rock drilling tool steel performance intelligent analysis method based on machine learning. The method comprises the following steps: firstly, collecting chemical components, process, microstructure images and performance data of rock drilling tool steel; then, a process-component prediction model and a microstructure image prediction model are constructed, and relations between component-process and microstructure characteristics and performance are mined respectively; then, the proportion of each component of the microstructure is obtained by combining finite element simulation with a genetic algorithm; predicting performance by using an XGBoost algorithm, comparing real indexes, and constructing an error feedback mechanism optimization model; and finally, solving an optimal parameter combination meeting a strength-toughness index by means of a particle swarm optimization algorithm. According to the method, multi-source data and multiple intelligent algorithms are fused, the defects of a traditional analysis method are effectively overcome, collaborative optimization of chemical components, the heat treatment process and the microstructure form is achieved, and the analysis precision and the production efficiency are improved.

The invention discloses a method for detecting tissue evolution in a heating process after quenching of tool steel based on saturation magnetization, resistivity and hardness, and relates to the technical field of metal material detection.The method comprises the steps that heating parameters are set for different types of tool steel, and an actual tempering process is simulated; then, the saturation magnetization intensity, the resistivity and the hardness are measured through professional equipment, and data are obtained through accurate measurement and scientific calculation; and then, sorting the data to establish a database, analyzing by using a multiple linear regression model, and judging an organization evolution stage according to a preset result range. According to the method, the structure evolution of the tool steel can be accurately and comprehensively monitored, the detection accuracy and scientificity are improved, powerful support is provided for quality control and process optimization in the tool steel production process, and the tool steel product performance and production efficiency are effectively improved.

The invention discloses a processing technology of a high-hardness wear-resistant steel guide rail, relates to the technical field of alloy tool steel heat treatment, and aims to solve the problems of insufficient wear resistance, large heat treatment deformation, high cracking risk and non-uniform cooling in the production process of the high-hardness wear-resistant steel guide rail in the prior art. The invention provides a high-hardness wear-resistant steel guide rail prepared from 9Mn2CrWV steel, and a processing technology comprising preheating, austenitizing treatment, oil cooling (including heat straightening), primary tempering, deep cooling, secondary tempering and post-treatment. According to the process, by strictly controlling the temperature, the time and the medium of each stage, the hardness, the wear resistance and the structure uniformity of the guide rail are effectively improved, meanwhile, the risks of deformation and cracking are remarkably reduced, and green and environment-friendly production is achieved.

The invention belongs to the technical field of rolling, and particularly relates to an anti-decarburization and anti-brittle failure controlled cooling process for a high-silicon-chromium alloy tool steel wire rod. Aiming at the dilemma that the hot-rolled wire rod which contains more than 2.0% of Si, more than 1.1% of Cr, Mo, V and other alloy elements not only meets the decarburization requirement of a product, but also does not have brittle failure of the wire rod, the method comprises the following steps: firstly, determining the cover entering temperature of the hot-rolled wire rod, the cooling speed of the wire rod before the hot-rolled wire rod enters the cover and other key process parameters; and then the method is realized by adjusting the speed of a roller way, the number of opened heat preservation covers after spinning, a fan Jinling device, the air volume of a fan, the spinning temperature and the like, so that the hot rolling structure of the wire rod is a pearlite structure which is not easy to brittle, and meanwhile, the requirement that the decarburization of a product does not exceed 0.55 D (D is the diameter of the wire rod) is met.

The invention relates to a 1150MPa-grade high-strength carbon tool steel wire rod and a manufacturing method thereof.The 1150MPa-grade high-strength carbon tool steel wire rod comprises, by mass, 0.57%-0.62% of C, 0.38%-0.47% of Si, 0.53%-0.63% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S and the balance Fe and inevitable impurities, after the wire rod is rolled and spun, online molten salt isothermal toughening treatment is conducted on the wire rod, the wire rod is controlled to enter a sorbite phase region from a high-temperature austenite state, and the steel wire rod is subjected to high-temperature annealing treatment; the method comprises the following steps of: preparing a steel wire rod of which the microscopic structure comprises tempered sorbite, ferrite and fused sorbite, forming a structure mainly comprising fine lamellar spacing sorbite, carrying out isothermal tempering, and finally slowly cooling through a roller way, so that the steel wire rod of which the microscopic structure comprises tempered sorbite, ferrite and fused sorbite can reach the tensile strength of 1050-1100MPa and the percentage reduction of area of 45-50%, and can be applied to the application fields of manufacturing carbon tool steel and the like. And therefore, a tool part can be directly processed after cold forming.

The invention discloses an extrusion mold manufacturing method based on D2 tool steel, and belongs to the technical field of extrusion mold manufacturing, and the extrusion mold manufacturing method comprises the following steps: preparing D2 mold steel powder; d2 die steel powder and nickel-based tungsten carbide alloy powder are mixed according to the ratio of 90: 10; forming a mold blank by using a laser metal printer; the mold blank is put into a hot isostatic pressing furnace, heat preservation is conducted for 1-2 h at the temperature of 950-1000 DEG C and the pressure of 100-110 MPa, and cooling is conducted; then carrying out polishing, cleaning and drying treatment; and preparing an alloy coating on the surface of the mold blank through a laser cladding technology to obtain the mold. In this way, the hardness of the prepared mold is larger than 70, the corrosion rate at 250 DEG C is smaller than 5 cm < 2 >. H <-1 >, the grain size is larger than 10 grades, the wear rate at 400 DEG C is 5.04 * 10 <-5 > mm < 3 >. N <-1 >. M <-1 >, and the mold has good high-temperature corrosion resistance and high-temperature wear resistance.

The invention relates to a 1250MPa-grade high-strength tool steel wire rod and a manufacturing method thereof.The manufacturing method includes the steps that after medium-carbon alloy components containing trace Nb and V are designed, rolled and spun into a wire rod, online molten salt quenching strong isothermal treatment is conducted, the wire rod is made to pass through front-section molten salt firstly, the wire rod is controlled to enter a bainite phase region from a high-temperature austenite state at the cooling speed larger than or equal to 35 DEG C / s, and then the high-strength tool steel wire rod is manufactured; the preparation method comprises the following steps: firstly, quenching bainite is taken as a main raw material to form a quenching structure taking the quenched bainite as a main raw material, then, the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared through rear-section molten salt heating, isothermal tempering and toughening destressing treatment on the quenching structure, carbide precipitation control and roller way slow cooling finally, and the strength and plasticity matching of the steel wire rod can be improved by adjusting the structure state, so that the strength and plasticity of the steel wire rod are improved. The tensile strength is 1175-1225 MPa, the percentage reduction of area is 58%-63%, and the steel can be directly machined into parts after cold machining forming, so that the production energy consumption of the tool steel is reduced, the cost is reduced, and the efficiency is improved.

The invention relates to a 1100MPa-grade high-strength carbon tool steel wire rod and a manufacturing method thereof, a carbon component design is adopted, the rolled and spun wire rod is subjected to online molten salt isothermal toughening treatment, and the wire rod is controlled to enter a sorbite phase region from a high-temperature austenite state at a cooling speed of more than or equal to 32 DEG C / s to form a structure mainly comprising fine lamellar spacing sorbite; the steel wire rod is controlled to be subjected to isothermal tempering, sorbite lamellar fusing promotion and toughening destressing treatment in an isothermal interval, and finally the steel wire rod with the microscopic structure comprising tempered sorbite, ferrite and fused sorbite is manufactured through roller way slow cooling, so that the material cost can be reduced, the overall strength and plasticity of the steel wire rod can be improved, the tensile strength is 1020-1070 MPa, the percentage reduction of area is 46%-51%, and the steel wire rod can be manufactured into the steel wire rod with the microstructure comprising tempered sorbite, ferrite and fused sorbite. Therefore, the tool part can be directly machined after cold machining, additional heat treatment after cold machining is omitted, the production cost and energy consumption of downstream users are reduced, and the production efficiency and the yield are improved.

The invention relates to a 1150MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a high-Cr medium-carbon component design, after a steel billet is rolled and spun into the wire rod, on-line molten salt low-temperature quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment firstly, the wire rod enters a lower bainite phase region from a high-temperature austenite state at a cooling speed of more than or equal to 35 DEG C / s, and the steel wire rod is subjected to high-temperature quenching isothermal treatment at a cooling speed of more than or equal to 35 DEG C / s; the method comprises the following steps: quenching bainite to form a structure taking the quenched bainite as a main part, then carrying out rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally carrying out roller bed cover opening slow cooling to prepare the wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the initiation of an abnormal brittle structure can be inhibited, the structure state of the wire rod is effectively controlled, and the toughness performance matching of the wire rod is improved; the tensile strength is 1050-1100 MPa, and the percentage reduction of area is 59%-64%, so that the alloy can be directly processed into parts after cold forming.

The invention relates to a 1450MPa-grade high-strength tool steel wire rod and a manufacturing method thereof.The method includes the steps that after Nb-V chemical component design rolling and spinning are conducted to form a wire rod, online molten salt phase change regulation and control quenching isothermal treatment is conducted, the wire rod is controlled to be cooled from a high-temperature austenite state at the front-section molten salt at the cooling speed larger than or equal to 36 DEG C / s, part of austenite is promoted to be converted into a martensite structure, and then the temperature of molten salt is reduced from the high-temperature austenite state at the cooling speed larger than or equal to 36 DEG C / s; the method comprises the following steps: heating to a sorbite phase region through a rear-section molten salt, promoting the transformation of austenite residues to a sorbite structure, carrying out isothermal tempering toughening destressing treatment on the structure, and finally carrying out roller way slow cooling to prepare the wire rod with a microscopic structure comprising isothermal sorbite and tempered martensite, so that the strength and plasticity matching of the wire rod can be improved, the tensile strength is 1410-1460 MPa, and the tensile strength is 410-460 MPa. The percentage reduction of area is 37%-42%, additional heat treatment is avoided after cold machining forming, tool steel parts are directly machined, the production energy consumption and cost of the high-strength tool steel are reduced, and the production efficiency is improved.

The invention relates to a 1400 MPa-grade high-strength tool steel wire rod and a manufacturing method thereof.The method comprises the steps that after a Cr-V chemical component design is adopted for rolling and spinning to form a wire rod, online fused salt mixing quenching isothermal treatment is conducted, the wire rod is controlled to enter a sorbite phase region from a high-temperature austenite state at the cooling speed larger than or equal to 32 DEG C / s, part of austenite is promoted to be converted into a sorbite structure, and then the steel wire rod is rolled and spun; the method comprises the following steps: quenching austenite to form a quenching structure mainly comprising the retained austenite, carrying out isothermal tempering on the quenching structure to convert the retained austenite into martensite, toughening and destressing, and carrying out roller way slow cooling to prepare the steel wire rod with a microscopic structure comprising isothermal sorbite, tempered martensite and ferrite, so that the material cost can be properly controlled; the cold machining performance and the high-strength characteristic of the wire rod are considered, the tensile strength of a product is 1370-1420 MPa, and the percentage reduction of area is 35-40%, so that the heat treatment procedure after cold machining of the tool steel is omitted, the production energy consumption and cost of the tool steel are reduced, and the production efficiency is improved.

The invention discloses a novel method for detecting the thickness of a diamond and diamond-like carbon coating layer based on X-rays, which adopts X-ray nondestructive detection and adds an optimization algorithm, can solve the influence of residues on a detection result by an algorithm for single-ray mutual interference of the same element, and can improve the detection accuracy. The optimization algorithm and the method can be applied to the thickness of diamond grown in the surface physical modification direction of chip products, diamond-like carbon (DLC) coatings on the surfaces of hard alloys such as tool steel and structural materials, CVD (chemical vapor deposition) diamond coatings and the like. The method is also applicable to other element thicknesses of which the surfaces are not detected by the energy dispersion X-ray fluorescence spectrometer, such as nitrogen N layers and oxygen O layers, and also comprises cicada wing membranes or biological bionic membranes in the biological direction. In the aspect of chemical industry, the method is suitable for PE polyethylene and epoxy resin.

The invention relates to the technical field of drilling tool steel pipes, in particular to deep hole wire line coring drilling tool machining equipment which comprises a base and two vertical plates and further comprises two chucks rotationally arranged on the two vertical plates. The centering mechanism is horizontally and movably arranged above the base through a reciprocating mechanism; the two reversing mechanisms respectively drive the two chucks to intermittently rotate by a certain angle; the centering mechanism comprises a positioning block, a round hole is formed in the positioning block, and the round hole coincides with the axis of the two chucks. The two ends of the bent drilling tool steel pipe are fixed through the two chucks, the reciprocating mechanism drives the positioning block to continuously move in a reciprocating mode, and the multiple rolling wheels in the positioning block continuously roll the outer side of the drilling tool steel pipe back and forth, so that the bent drilling tool steel pipe can be rapidly straightened, the position where a bent section is located does not need to be sequentially found along the drilling tool steel pipe, and the working efficiency is improved. When a large batch of long drilling tool steel pipes are straightened, the machining time can be greatly shortened.

The invention discloses a using method of a bearing phosphating material frame. The bearing phosphating material frame comprises a conveying trolley, a hanging tool and a hook. The transport trolley comprises a trolley tray, four universal trundles installed on the bottom faces of the four corners of the trolley tray and two hanging tool inserting grooves fixed to the middles of the two side faces of the trolley tray. The hanging tool comprises a hanging tool steel frame and a hanging rack; the hanger steel frame comprises a bottom frame, two top frames, two pairs of positioning shafts and two pairs of lifting hook shafts; the hanging frame comprises a grid hanging plate, two inserting rods fixed to the two sides of the grid hanging plate and a connecting column fixed between the middle of the top face of the grid hanging plate and the bottom face of the middle of the bottom frame. The hanging tool is inserted into the two hanging tool slots of the transport trolley through the two insertion rods; the hook comprises an inner ring hook and an outer ring hook, and the inner ring hook and the outer ring hook are hung on the front face and the back face of the grid hanging plate through two hanging plate hook bodies respectively. The problem of butt joint with an automatic phosphating line and an AGV transport vehicle can be perfectly solved, the production efficiency of the phosphating procedure is improved, cost is reduced, and efficiency is improved.

The invention relates to a 1500MPa-grade high-strength tool steel wire rod and a manufacturing method thereof.The method includes the steps that after Nb-V chemical component design is adopted for rolling and spinning to form a wire rod, online molten salt subcooling quenching isothermal treatment is conducted, molten salt of the wire rod at the front section is controlled to enter a martensite phase region from a high-temperature austenite state at the cooling speed larger than or equal to 37 DEG C / s, part of austenite is promoted to be converted into a martensite structure, and then the steel wire rod is rolled and spun; the method comprises the following steps of: heating to a sorbite phase region through a rear-section molten salt, promoting the transformation of austenite residues to a sorbite structure, carrying out isothermal tempering toughening destressing treatment on the structure, and finally slowly cooling through a roller way to prepare a wire rod of which the microscopic structure comprises tempered sorbite and tempered martensite, the material cost can be properly controlled, the phase change of the wire rod is powerfully regulated and controlled, the strength and plasticity matching of the wire rod is improved, the tensile strength is 1470-1520 MPa, and the percentage reduction of area is 52%-57%, so that additional heat treatment after cold machining is omitted, the production energy consumption and cost of the tool steel are reduced, and the efficiency is improved.

An object is to provide a wood-cutting edged tool that is easily reground and that is used for cutting a woody material. The wood-cutting edged tool includes: a cutting part provided with a cutting edge having a surface; and a hardening layer with a base material being modified through nitriding or carburizing, the hardening layer being formed on the surface. The hardening layer has a surface hardness of higher than 40 HRC. The wood-cutting edged tool is formed from a tool steel. The hardening layer formed on the surface through nitriding or carburizing is integrated with the base material. Thus, unlike a coating layer, the hardening layer has a low risk that independently-occurring damage that involves peeling or the like occurs owing to regrinding.

The invention discloses a manufacturing method for a meat grinder blade. The manufacturing method comprises the following steps that S01, 440C cutter steel powder is selected; s02, an injection mold corresponding to the meat grinder blade is selected, the injection mold comprises a front mold body and a rear mold body, and the front mold body and the rear mold body are heated; s03, the 440C cutter steel powder is fed into an injection molding machine to form a blank; step S04, trimming the blank piece; s05, the blank is placed on the ceramic plate, the ejector pin face of the blank faces upwards, and the sprue face of the blank faces downwards; s06, the blank obtained after workpiece placing is completed is transferred into a vacuum degreasing furnace to be degreased; s07, the blank is transferred into a vacuum sintering furnace to be sintered; s08, the sintered blank is transferred to a flat grinding machine to be subjected to flat grinding; s09, the blank piece obtained after plane grinding is checked, and the blank piece which is checked to be qualified is subjected to magnetic polishing; the concentricity of the shaft hole of the meat grinder blade and the blade body can be improved, and the coaxiality of the assembled meat grinder blade is correspondingly improved.

A cooling insert for a die, such as a distributor for a high pressure die casting assembly, and a method of manufacturing the cooling insert, is provided. The cooling insert can be formed of H13 tool steel and is manufactured using an investment casting process, for example, a process which uses a printed investment casting shell. The cooling insert includes complex cooling channels to improve cooling and reduce the duration of the casting process.

The invention relates to a tool steel wire rod and a production method for controlling segregation of a continuous casting billet. The tool steel wire rod comprises the following chemical components in percentage by mass: 1.10%-1.20% of C, 0.10%-0.35% of Si, 0.10%-0.30% of Mn, 0.0040%-0.015% of P, 0.0030%-0.014% of S, 0.00050%-0.0018% of As, 0.0005%-0.0020% of W, 0.00004%-0.0005% of Se and the balance of Fe and inevitable impurities. According to the method, system design is conducted on the ultrahigh-carbon tool steel wire rod with the carbon content being about 1.2% from the aspects of chemical components, the smelting process and the rolling process, continuous casting is adopted for replacing a traditional die casting production process, the carbon segregation index of a continuous casting blank does not exceed 1.07, and segregation of the continuous casting blank is effectively controlled.

The invention discloses a tool steel plasma cutting device and a using method, and relates to the technical field of cutting devices, the tool steel plasma cutting device comprises a base and a double-shaft driving assembly, a first assembling opening and a second assembling opening are formed in the side wall of the base, and the double-shaft driving assembly is connected into the first assembling opening and the second assembling opening. By installing the double-shaft driving assembly, the inner track and the outer track, stable annular cutting of tool steel through the double-shaft driving cutting head is achieved, multi-direction movement and multi-angle cutting of the cutting head are achieved, cutting flexibility and precision are improved, and the problems that when a traditional cutting device rotates in a single shaft mode, vibration is likely to be generated, consequently, the cutting face is rough, and cutting quality is poor are solved. And the complex machining requirements cannot be met.

The invention relates to a welding tool for a ceramic coating stirring head, which comprises a working rack and a bearing platform fixedly mounted on the upper end face of the working rack, a stirring head assembly is further mounted at the upper end of the working rack, and the bearing platform is positioned below the stirring head assembly and is used for bearing a to-be-welded workpiece; the stirring head assembly can move in the X-axis direction, the Y-axis direction and the Z-axis direction relative to the bearing platform. The stirring head assembly comprises a connecting disc, a shaft shoulder and a stirring needle, wherein the shaft shoulder and the stirring needle are installed at the lower end of the connecting disc. The shaft shoulder is connected to the lower end of the driving disc; and performing ceramic coating treatment on a shaft shoulder and a stirring needle of the tool steel stirring head. By utilizing the characteristics of wear resistance, corrosion resistance, adhesion prevention, high hardness, high temperature resistance and good biocompatibility of the ceramic coating, compared with a hard alloy stirring head, the stirring head body is low in processing difficulty, meets the welding of special materials, is better in toughness compared with the hard alloy, and is far lower than the whole hard alloy in cost.

The utility model discloses a broken line pre-tensioning method prestressed tendon downward-pressing bending driving device which comprises a precast beam bottom die and a tool steel strand, and further comprises a downward-pressing anchor device, a counter-force device and a downward-pressing driving device, the downward-pressing anchor device is located above the precast beam bottom die, and the counter-force device is located below the precast beam bottom die; the lower pressure anchor device comprises a lower pressure anchor limiting block and a lower pressure anchor piece, the tool steel strand sequentially penetrates through the lower pressure anchor piece, the lower pressure anchor limiting block, the precast beam bottom die and the middle of the counter-force device, and the lower pressure anchor limiting block is located above the precast beam bottom die and tightly connected with the precast beam bottom die. The lower pressure anchor piece is located above the lower pressure anchor limiting block, and the lower end of the lower pressure anchor piece is tightly connected with the lower pressure anchor limiting block. According to the utility model, the tool steel strand is adopted for anchor penetrating and pressing, and the bending angle is easy to control.

The device for improving the carbon segregation of the high-carbon tool steel comprises a crystallizer, a submersed nozzle, a plurality of guide pipes, metal wires and a wire feeding mechanism, the guide pipes are vertically arranged above the crystallizer, and the guide pipes are located in the middle of the crystallizer in the width direction and arranged on the two sides of the submersed nozzle; the distance between the guide pipe adjacent to the immersion nozzle and the immersion nozzle is 200-350 mm, the distance between the guide pipe adjacent to the narrow edge of the crystallizer and the narrow edge of the crystallizer is 200-350 mm, and the metal wire is driven by the wire feeding mechanism to penetrate through the guide pipes to be vertically immersed in molten steel. According to the method, the metal wire is fed in the continuous casting process, the temperature deviation in the thickness direction of the continuous casting blank is reduced, meanwhile, the nucleating agent is introduced into the thickness center of the continuous casting blank, and therefore in the blank shell forming process of the casting blank, isometric crystals can be formed in the center, formation of developed columnar crystals is restrained, and composition segregation in the casting blank is reduced. The layering phenomenon of the product is avoided, the product quality is improved, and the production cost is reduced.

The present invention relates to a 1100MPa grade high-strength tool steel wire rod and a manufacturing method thereof. The wire rod is designed with a chemical composition of medium carbon and Nb-V. The steel billet is rolled and spun into wire rod at a spinning temperature of 860°C or higher. The wire rod is then subjected to an online molten salt semi-quenching isothermal treatment. The wire rod is controlled to first undergo a front-end molten salt treatment so that the wire rod enters a bainite phase region from a high-temperature austenite state at a cooling rate of 30°C / s or higher, forming a structure mainly composed of quenched bainite. The wire rod is then subjected to a rear-end molten salt heating isothermal tempering and toughening stress relief treatment. Finally, the wire rod is slowly cooled on a roller to form a wire rod with a microstructure including tempered bainite and ferrite. The method can reduce material cost, effectively avoid martensitic brittle structure, control the microstructure of the hot-rolled wire rod, improve the plasticity and cold working performance of the wire rod, and achieve a product tensile strength of 980-1030MPa and a cross-sectional reduction rate of 61%-66%, so that the product can be directly processed into tool parts after cold forming.

The utility model relates to the technical field of tool steel, and discloses cold drawing forming tool steel with anti-skidding teeth on the surface, which comprises a tool steel main body, an anti-skidding groove I and an anti-skidding groove II are arranged on the outer surfaces of the upper end and the lower end of the tool steel main body, and the anti-skidding groove I is arranged on one side of the anti-skidding groove II. Reinforcing ribs are detachably connected to the outer surfaces of the upper end and the lower end of the tool steel body, when the tool steel is used, the tool steel and a connecting part can be stably and fixedly connected together conveniently through the first anti-skid groove and the second anti-skid groove, the whole tool steel can be reinforced through the arranged reinforcing ribs, and therefore the tool steel can be conveniently and stably connected. The tensile strength of the whole tool steel is improved, semicircular ribs and third anti-skid grooves are arranged, the tool steel can make better contact with a clamping part conveniently, the stability of the tool steel in the clamping process is improved, sideslip or falling-off and other conditions are not prone to occurring, and better use prospects can be brought.

A preparation method of carbon tool steel in hot rolling relates to the technical field of carbon tool steel preparation, and comprises the following steps: evaluating whether the concentration of early-stage excess gas in a furnace is too high or not, and predicting the gas excess condition according to historical detection data so as to realize early warning of the gas excess condition; the method is beneficial for knowing the problem of gas excess possibly occurring in the hot rolling process in advance, finally, whether the concentration of the excess gas in the heating area is evenly distributed or not is diagnosed, the problems of steel billet oxidation and decarbonization and unstable quality caused by too high gas concentration are solved, it is ensured that the steel billet is evenly heated through accurate adjustment, and the product quality and consistency are improved.

The application provides a tool steel and a preparation method thereof. The tool steel comprises the following chemical components in percentage by mass: C: 0.50-0.59%, Si: 0.80-0.95%, Mn: 0.35-0.55%, Cr: 8.00-9.00%, W: 0.80-1.20%, Mo: 3.00-3.40%, V: 0.30-0.50%, Nb: 0.15-0.30%, Co: 0.18-0.38%, Ni: 0.15-0.35%, and the balance of Fe and impurities. The tool steel has excellent high strength, high toughness and red hardness through the design of alloy components, the increase of the content of Mo, the addition of Co and Ni elements, the design principle of multiple element combination, and the comprehensive consideration of the precipitation and growth mechanism of different element carbides in the solidification process.