322 results about "Electro-slag remelting" patented technology

The invention discloses a high-strength high-temperature alloy and a preparation method thereof. The high-strength high-temperature alloy comprises a high-temperature alloy matrix and rare earth oxides dispersed and distributed in the high-temperature alloy matrix. The high-temperature alloy matrix is GH4169, and the high-temperature alloy matrix is made of The rare earth oxide is one or two of La2O3 and Ce2O3, the particle size of the rare earth oxide is 50-500nm, and the total adding amount of the rare earth oxide is 0.02-0.03% of the mass of the alloy; the preparation method of the high-strength high-temperature alloy comprises the following steps: (1) preparing rare earth oxide particles; (2) charging and smelting rare earth oxide particles and alloy raw materials in a vacuum induction furnace, and casting into ingots after the components are qualified; (3) electroslag remelting: adding analytically pure rare earth oxide into a slag system; and (4) the electroslag ingot is subjected to homogenization, forging and solid solution aging treatment, and then the alloy is obtained. According to the method, the strength and plasticity of the high-temperature alloy are improved.

The invention discloses a pickling-free cold heading Kovar alloy wire production process which comprises the following steps: S1, raw material preparation: preparing the following raw materials in percentage by mass: 41.5% of Ni, 0.5% of Co, less than or equal to 0.03% of C, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Fe; mixing the materials, and carrying out vacuum induction melting and electroslag remelting to prepare an alloy ingot; the alloy cast ingot is subjected to hot rolling treatment to form a hot-rolled wire rod with the diameter being 12.0-16.0 mm; s2, peeling treatment is conducted, specifically, surface layer defects of the hot-rolled wire rod in the step S1 are removed through a peeling machine; s3, dry-type drawing treatment is conducted, specifically, the hot-rolled wire rod treated in the step S2 is subjected to dry-type drawing through a dry-type drawing die to form an alloy wire; s4, intermediate annealing treatment is conducted, specifically, the alloy wire in the step S3 is placed in an annealing furnace, sufficient hydrogen is input into the annealing furnace, intermediate annealing is conducted under the hydrogen protection atmosphere, the annealing temperature is 950-1100 DEG C, and the annealing walking speed is 3-5 m / min; the surface quality and the size consistency of the wire can be improved, meanwhile, the defects of environmental pollution, hydrogen embrittlement and the like are reduced, and the use requirements of high-end precise cold heading parts are met.

The invention discloses a meta-model decision-making-based intelligent prediction method for inclusion quality in an electroslag remelting process. The method comprises the following steps of: constructing a sample data set containing process and component characteristics and target variables; obtaining a first-layer basic model based on an SHAP value cumulative contribution rate screening method; a heterogeneous learner is adopted to construct a first layer structure of the stacked integrated learning model, and Bayesian is adopted to carry out adjustment and optimization; adopting logistic regression as a meta-learner to construct a second-layer structure of the stacked integrated learning model; training by adopting a five-fold cross validation strategy, and predicting the performance by using a multi-index quantitative model; and deploying the D-type inclusion prediction model in the electroslag remelting process to an actual process, collecting process parameters as input data in real time by using a multi-sensor group, performing D-type inclusion risk prediction of a corresponding heat, and outputting an inclusion risk prediction result. According to the method, the accuracy and reliability of D-type inclusion prediction can be remarkably improved.

The invention belongs to the technical field of high-temperature alloy heat treatment, and discloses a method for improving the hot working performance of a nickel-based high-temperature alloy for a molten salt reactor by combining pre-deformation and homogenization. The method comprises the steps that raw materials of the nickel-based superalloy for the molten salt reactor to be improved are sequentially subjected to vacuum induction melting, pouring and electroslag remelting refining treatment, and an electroslag remelting refined alloy cast ingot is obtained; the electroslag remelting refined alloy cast ingot is sequentially subjected to heating, heat preservation and pre-deformation treatment and is air-cooled to the room temperature, and a pre-deformed cast ingot is obtained; and the pre-deformed cast ingot is subjected to homogenization treatment and air cooling to the room temperature, and the method is completed. The method is a novel heat treatment process combining pre-deformation and high-temperature homogenization, the hot working performance of the alloy is optimized, the high-temperature alloy uniform in structure and excellent in mechanical property is obtained, and application in the field of high-temperature molten salt energy systems is met.

The invention discloses a data-driven modeling and predictive control method for an electroslag remelting process with a time delay characteristic. The data-driven identification modeling is performed on the electroslag remelting process based on a mechanism relationship between the stroke of a servo motor encoder and the output position of a consumable electrode; converting the transfer function model into a standard linear regression form; estimating a nonlinear time delay parameter by using a one-dimensional search algorithm, and constructing an adaptive forgetting factor by using an estimated parameter change rate; an augmented state vector is introduced into a historical control input sequence, so that an original time-delay system is converted into an equivalent time-delay-free augmented state space model; phase lag caused by multi-source time lag is dynamically compensated through a rolling optimization mechanism, interference of uncertain factors is effectively restrained in combination with feedback correction, an optimal control sequence is obtained, and a controller is made to control an electroslag remelting system with strong nonlinearity and multi-time-lag coupling dynamic characteristics in real time through the optimal control sequence. The method has excellent tracking precision and good control stability in the electroslag remelting tracking control process.

The application discloses a device for reducing fluorine-containing gas pollutant emission in electroslag remelting and a use method, which comprises a flue gas recovery cover (1), a flue gas discharge pipeline (7) and a purification tank (10). The flue gas recovery cover (1) is respectively provided with a remelted slag discharging hole (2), a self-consuming mother electrode (6) passing hole and a flue gas discharge pipeline (7) mounting hole. The flue gas discharge pipeline (7) is arranged through the flue gas discharge pipeline (7) mounting hole, one end of the flue gas discharge pipeline (7) is located in a closed space formed by the flue gas recovery cover (1) and a crystallizer (5), and the other end is inserted into the purification tank (10). A fan (8) is arranged on the flue gas discharge pipeline (7). Through the device, the fluorine-containing flue gas is recovered, and the fluorine-containing flue gas is converted into calcium fluoride by using an alkali solution. The device can realize the cyclic and repeated use of part of the calcium fluoride, greatly reduces the concentration of fluorine-containing harmful gas in the air environment of an electroslag remelting operation site, and makes the concentration of the fluorine-containing harmful gas reduce from the original 5.6 mg / m 3 to 0.02 mg / m 3 .

The invention discloses a method for reducing impurity element sulfur in cast high-temperature alloy return scraps, and belongs to the technical field of metal material smelting. The method comprises the following steps: carrying out vacuum induction melting on pretreated cast high-temperature alloy return scraps of the same mark to obtain a return scrap alloy induction ingot; surface oxide skin of the obtained return scrap alloy induction ingot is removed, a primary shrinkage cavity in the upper end is cut off, then the return scrap alloy induction ingot and an auxiliary electrode are coaxially welded, and a consumable electrode is obtained; and after the consumable electrode is baked, electroslag remelting is conducted under the protective atmosphere, and an electroslag ingot is obtained. On the basis of vacuum induction melting, the protective atmosphere electroslag remelting technology is further adopted for conducting deep purification melting treatment on the return scrap alloy ingot, the content of the impurity element S in the return scrap alloy ingot can be reduced to 0.5 ppm or below, and the content of the impurity element S in the return scrap alloy ingot reaches the level lower than the content of the element S in a new material; and the high-temperature oxidation resistance and corrosion resistance of the alloy can be obviously improved, and the fatigue, durability and other mechanical properties of the alloy are improved.

The invention provides a preparation method of a GH706 high-temperature alloy large-size bar billet, which comprises the following five steps: (1) a GH706 high-temperature alloy ingot prepared by a triple smelting process of vacuum induction melting, protective atmosphere electroslag remelting and vacuum consumable remelting comprises the following chemical components in percentage by weight: 0.025%-0.060% of C, 14.50%-17.50% of Cr, 39.00%-44.00% of Ni, 1.50%-2.00% of Ti, 2.50%-3.30% of Nb + Ta, 0.15%-0.50% of Al and the balance of Fe and inevitable impurities; the balance is Fe and other micro trace elements; (2) high-temperature homogenization treatment; (3) cogging and forging: carrying out high-temperature cogging and forging on the cast ingot for 2-3 heating numbers, wherein the forging modes are upsetting and drawing-out; (4) intermediate billet forging: performing medium-temperature multi-heating-number upsetting and octagonal drawing on the intermediate billet subjected to cogging forging; according to the preparation method of the GH706 high-temperature alloy large-size bar billet, the technical problem that the structure uniformity is difficult to control due to end face cracking, low forging yield and severe temperature rise in the cogging process of a large-size cast ingot is solved, and the preparation method has high application value in industrial actual production.

A preparation method for high-nitrogen austenitic stainless steel. The high-nitrogen austenitic stainless steel comprises the following chemical components in percentages by weight: carbon: ≤0.02%; silicon: 0.4-0.8%; manganese: 10.2-12.5%; chromium: 24.5-26.5%; nickel: 13.5-16.5%; molybdenum: 3.2-4.8%; nitrogen: 0.75-0.95%; phosphorus: ≤0.03%; sulfur: ≤0.0025%; vanadium: 0.016-0.022%; niobium: 0.026-0.034%; copper: 0.2-0.35%; aluminum: 0.01-0.02%; cerium: 0.015-0.025%; and the balance of iron and inevitable impurities. The preparation method comprises the steps of raw material charging, vacuum melting, refining, nitrogen-added alloying, deoxidation and desulfurization, casting, electroslag remelting, and secondary casting. The preparation is implemented by using the processes of smelting in a pressurized induction furnace and electroslag remelting under a protective atmosphere; and nitrogen is added by using a method in which a nitrogen alloy and pressurized nitrogen permeation are combined.

The invention relates to a nickel-based wrought superalloy cast ingot and a preparation method thereof.The preparation method comprises the following steps that a first raw material is subjected to smelting and high-temperature refining treatment, and a high-temperature refined melt is obtained; reducing the temperature of the high-temperature refined melt, adding Al and Ti into the high-temperature refined melt, and performing low-temperature refining treatment to obtain a low-temperature refined melt; ni-RE intermediate alloy raw materials are added into the low-temperature refined melt, rare earth composite smelting treatment is conducted, and alloy melt is obtained; the alloy melt is subjected to pouring treatment, and a vacuum induction cast ingot is obtained; the vacuum induction cast ingot is subjected to electroslag remelting treatment, and an RE-containing electroslag remelting ingot is obtained; wherein slag charge adopted in the electroslag remelting treatment contains rare earth oxide; the electroslag remelting ingot containing RE is subjected to vacuum consumable smelting treatment, and a vacuum consumable cast ingot is obtained; and performing diffusion annealing treatment on the vacuum consumable cast ingot to obtain the nickel-based wrought superalloy cast ingot. The method is mainly used for improving the homogeneity of the nickel-based wrought superalloy cast ingot.

The present invention discloses an electroslag remelting method for reducing vanadium burnout. The vanadium content of the consumable electrode is controlled to be above the upper limit of the target composition of the electroslag blank, and is controlled to exceed the target composition upper limit by 5% to 10%. The surface-treated consumable electrode is coated with, from the inside out, an aluminum powder layer and / or a vanadium monoxide powder layer, and a corundum powder layer. During the electroslag remelting stage, electroslag is added to the crystallizer, and the average thickness of the slag pool is controlled to be 1 / 3 to 1 / 2 of the equivalent diameter of the consumable electrode being melted. At the same time, inert gas is blown into the crystallizer at a flow rate of 5 to 20 L / min. During the feeding stage, electroslag is again added to the crystallizer, and the thickness of the slag pool is controlled to be 1 / 2 to 1.0 of the equivalent diameter of the consumable electrode being melted. The inert gas flow rate is controlled at 10 to 30 L / min. By spraying the surface of the consumable electrode, the present invention effectively prevents secondary oxidation of the vanadium element in the consumable electrode during the electroslag remelting process, thereby reducing vanadium burnout and solving the problem of poor control stability of the burnout rate of the easily oxidized element vanadium.

The invention discloses a method for producing martensite heat-resistant steel G115 for an ultra-supercritical power station based on electroslag remelting. The method comprises the following steps that S1, an electrode bar is obtained through EAF electric furnace smelting, LF refining, VD vacuum treatment and electrode die casting; s2, the electrode bar is subjected to electroslag remelting to obtain an electroslag ingot, a CaF2-Al2O3-CaO ternary slag system is adopted in the electroslag remelting process, Al powder, Si-Ca powder and B-Fe powder are added into the slag system, and argon protection is adopted in the whole process; and S3, after the electroslag ingot is demolded, annealing treatment is conducted. Smelting is conducted through the EAF electric furnace smelting technology, the LF refining technology, the VD vacuum treatment technology, the electrode die casting technology and the electroslag remelting technology, the problems of precise control over the easily-burnt element B and the gas content N and solidification structure segregation are solved, the product performance is further improved, and the welding process window is improved.

The invention discloses antioxidant heat-resistant cast steel and a preparation method thereof. The cast steel comprises the following components in percentage by mass: 0.08-0.15% of C; 0.1% to 0.8% of Zr; 0.05% to 0.8% of Hf; 0.1% to 0.8% of Re; 8.0% to 11.0% of Cr; 0.5% to 2.5% of Ni; 1.0% to 2.0% of Mo; 0 < Si < = 0.5%; 0 < Mn < = 1.0%; 0 < P < = 0.025%; 0 < S < = 0.015%. According to the antioxidant heat-resistant cast steel added with zirconium, hafnium and rhenium and the electroslag remelting preparation method of the antioxidant heat-resistant cast steel, the grain size of heat-resistant steel is larger than or equal to the ASTM7 grade; the service life is not less than 500 hours under the conditions of 650 DEG C and 170 MPa, the service life is not less than 150 hours under the conditions of 700 DEG C and 100 MPa, and the weight gain rate is not more than 0.1 mg / cm < 2 > after oxidation for 100 hours at 700 DEG C.

The invention belongs to the technical field of ferrous metallurgy and material modification, and particularly relates to a preparation method of green short-process hot work die steel, which comprises the following steps: obtaining scrap steel, adding alloy, and smelting to obtain molten steel; the molten steel is refined through fluoride-free rare earth refining slag, and refined molten steel is obtained; adding a nanoparticle modifier into the refined molten steel to obtain modified molten steel; and the modified molten steel is subjected to continuous casting or die casting, and the hot work die steel is obtained. According to the method, the fluorine-free rare earth slag refining and nano particle modification combined technology is adopted, fluorine-containing refining slag and traditional electroslag remelting are effectively replaced, power consumption and carbon emission in the smelting process are reduced, the technical development requirements of current green manufacturing and dual-carbon targets are met, and green short-process manufacturing of the hot work die steel is achieved; and the prepared hot work die steel has higher cleanliness, a more uniform organization structure and more excellent thermal fatigue performance.

The invention discloses a preparation method of a martensitic stainless steel medium plate. The stainless steel comprises the following chemical elements in percentage: 0.21-0.28% of C; 0.15% to 0.30% of Si; 0.50% to 0.80% of Mn; less than or equal to 0.020% of P; s < = 0.005%; cr: 13.00% to 14.00%; 0.20% to 0.30% of Mo; 0.60% to 0.80% of Ni; the Cu accounts for 0.20%-0.25%, the V accounts for 0.10%-0.20%, and the Nb accounts for 0.03%-0.08%; 0.080% to 0.12% of N; and the balance of Fe and inevitable impurities. The preparation method comprises the steps that molten steel is smelted, steel ingot pouring is conducted, the steel ingot cast into an electrode blank is subjected to double-slag-system electroslag remelting under the protective atmosphere, and a slag system for the first time of electroslag remelting comprises a CaF2-Al2O3-CaO-MgO quaternary slag system with the proportion being 40%: 25%: 30%: 5%; a slag system for secondary electroslag remelting comprises a five-membered slag system of CaF2-Al2O3-CaO-MgO-SiO2 with the proportion of 40%: 30%: 23%: 5%: 2%, and the processes of forging cogging, blank hot rolling, cooling, low-temperature normalizing and spheroidizing annealing heat treatment are carried out. The martensitic stainless steel prepared through the method has the characteristics of being good in corrosion resistance, high in heat treatment hardness, uniform in structure and stable in performance.

The invention belongs to the technical field of metallurgy, and particularly relates to a slag charge for electroslag remelting in a high-altitude and high-humidity environment and a preparation method thereof.The slag charge is prepared from 20-22% of calcium fluoride, 25-28% of aluminum oxide, 20-25% of calcium oxide, 8-10% of magnesium oxide, 8-10% of silicon dioxide, 3-8% of rare earth oxide and 1-5% of barium oxide; for high altitudes (barometric lt; 90 kPa) and high humidity (relative humidity gt; the invention provides the low-hygroscopicity, low-fluorine and environment-friendly slag charge, so that the stability of the slag pool is improved, the oxyhydrogen control is realized, and the energy consumption is reduced.

The invention discloses a preparation method of a novel low-alloy steel solid welding wire. The preparation method comprises the following steps of S1, raw material smelting, S2, a hot working stage, S3, a cold working stage, S4, surface treatment and S5, quality detection. During raw material selection, C-Mn-Si is adopted as a basic alloy, the content of C is 0.06-0.12%, the content of Mn is 1.2-1.6%, then a Ti-B microalloy is added, the hardenability is improved, the O / N content is limited at the same time, then a two-stage refining process combining vacuum induction melting and electroslag remelting is adopted, the melting temperature, time and refining slag system components are regulated and controlled, and the hardness of the alloy is improved. The method comprises the following steps: preparing a copper plating solution through equipment, deeply removing harmful impurities such as S and P, promoting floating and size refinement of inclusions by applying an electromagnetic stirring technology, remarkably improving the purity of a metal matrix, thereby improving the purity of raw material smelting, proportioning the copper plating solution through the equipment, setting the parameters of the copper plating equipment to be 10-15A / dm in current density and 2-3mu m in plating thickness, and carrying out a copper plating process on a welding wire.

The invention relates to a method for adding rare earth elements into plastic die steel by adopting electroslag remelting, and solves the problems that the existing rare earth elements are oxidized again to form inclusions after being added, so that the effect of purifying molten steel cannot be achieved, and large-particle rare earth inclusions are brought to steel. According to the invention, rare earth elements are stably added into the steel by adopting the rare earth pre-melting slag and a deoxidizing agent matching method. The rare earth elements are stably added into the plastic die steel in the electroslag remelting process in a newly-designed rare earth pre-melting slag and rare earth deoxidizing agent mode. The rare earth content in the number die steel is stably controlled to be 30 ppm to 50 ppm, the total oxygen content is controlled to be smaller than or equal to 18 ppm, and the inclusion content in the steel is small and is controlled to be smaller than or equal to 0.5 grade.

The application provides a heat treatment method of a Ni30 high-temperature alloy, and comprises the following steps: S1: producing an electrode bar: according to the chemical composition of the Ni30 alloy, metal raw materials are loaded into a non-vacuum induction furnace, current heating is carried out to melt at 1500-1600 DEG C, then pouring is carried out in an ingot mold, mold cooling is carried out, then demolding is carried out, and then air cooling is continuously carried out to room temperature, so that a solid solution electrode bar is obtained; S2: high-temperature solid solution: the solid solution electrode bar obtained in the step S1 is loaded into a heating furnace, heating is carried out to 1050-1150 DEG C, and then holding is carried out for 4-8 hours, then the furnace is discharged, and water cooling is carried out to room temperature, so that a solid solution electrode bar is obtained; S3: electroslag remelting smelting: the solid solution electrode bar obtained in the step S2 is subjected to electroslag remelting smelting, so that an electroslag ingot is obtained, and preparation is completed. Through the application, the problem that the Ni30 high-temperature alloy electrode bar prepared by the conventional heat treatment method has large stress, the process parameters are unstable in the electroslag remelting process, the quality of the electroslag ingot is unstable, and the material yield of forging is low is solved.

A wrought nickel-molybdenum alloy containing 27.22 wt.% molybdenum, 4.73 wt.% iron, 0.47 wt.% chromium, 0.67 wt.% manganese, and 0.25 wt.% aluminum, and the balance nickel, as well as this alloy plus or minus the manufacturing variances typically encountered by each element during air melting, vacuum melting, and electro-slag remelting, have improved resistance to thermally-induced embrittlement over 100 hours at 1200⁰ F.

The invention discloses modified high-carbon alloy steel and a preparation method and application thereof, and belongs to the technical field of high-carbon alloy steel for aluminum alloy forming dies. The preparation method disclosed by the invention comprises the following steps: carrying out electroslag remelting on a high-carbon alloy steel rod to obtain a casting blank; carrying out thermoplastic deformation on the casting blank to obtain a blank; the blank is annealed, so that carbides in the blank are eliminated or become fine particles, spherical graphite can be separated out, and the modified high-carbon alloy steel is obtained; the particle size of the fine particles is smaller than 10 microns. According to the method, coarse and large carbides which are difficult to eliminate in the high-carbon aluminum alloy forming die steel containing strong carbide forming elements such as Cr, Mo and V or medium-strong carbide forming elements are subjected to rapid and basic graphitization through a thermoplastic deformation and high-temperature graphitization combined process; the technical problem that carbide decomposition and graphite precipitation control are difficult to realize in the existing method is solved.

A method for preparing a sealing ring material for ultra-supercritical steam turbines belongs to the field of metallic materials. A master alloy is prepared by vacuum induction melting, followed by gas-supported electroslag remelting to obtain an electroslag ingot. The composition of the electroslag ingot is (3.5–4 wt%) Fe, (7.5–8 wt%) Mn, (1.8–2.0 wt%) Nb, (1.5–1.8 wt%) Si, (1.9–2.1 wt%) Ti, (17–18 wt%) B, with the remainder being Co. The electroslag ingot is then processed into a sealing ring blank of the required size using conventional hot deformation technology, held at 250–280°C for 60–90 minutes, and then precision-machined to obtain the finished sealing ring. The material of this invention exhibits excellent wear resistance, corrosion resistance, and high-temperature resistance. Two highly hard submicron-scale dispersed reinforcing phases are formed in the Co matrix. These two reinforcing phases possess high hardness and high strength, and are small in size, ensuring excellent high-temperature resistance of the sealing ring. At application temperatures above 400°C, some Co... 54 B 40 Fe6 can dissolve into the matrix, causing the amorphous matrix lattice to expand, which is beneficial to improving the sealing performance of the sealing ring.

The invention discloses an electroslag smelting method of low-Si low-Al B-containing heat-resistant stainless steel. According to the electroslag smelting method, the qualification rate of head and tail components of a steel ingot of an electric furnace casting rod after electroslag remelting reaches 100% through a quaternary slag system, and the sum of a fine system and a coarse system of non-metallic inclusions meets the requirement of not higher than grade 3; the thermal stress and phase change stress cracking of the steel ingot is prevented through stress relief annealing of the steel ingot, the tensile stress generated due to thermal expansion and cold contraction in the cooling process of the steel ingot and the phase change stress generated due to structural transformation are eliminated through the low-temperature annealing process, the steel ingot is prevented from cracking during long-time storage or saw cutting, many defects in the prior art are overcome, and the quality of the steel ingot is improved. The method has a remarkable industrial application prospect.

This invention provides a high-strength, high-toughness martensitic precipitation hardening stainless steel fastener and its preparation method, belonging to the field of metallurgical technology. The fastener is made of X5CrNiCuMo15-06 steel, and its chemical composition, by mass percentage, includes: C: ≤0.05%, Cr: 14-16%, Ni: 6.0-7.0%, Cu: 1.25-1.75%, Mo: 0.5-1.0%, Mn: ≤1.0%, Si: ≤1.0%, P: ≤0.008%, S: ≤0.005%, V: ≥8%C, with the balance being Fe and unavoidable impurities. This invention utilizes an ultra-low C+V microalloying composition design, a dual high-purity smelting process of vacuum induction and protective atmosphere electroslag remelting, combined with an integrated heat treatment system of solution treatment, deep cryogenic treatment, and aging treatment. This allows the material to maintain high strength while achieving excellent room temperature and ultra-low temperature toughness. The fasteners prepared can meet the high load-bearing and long-term service requirements of high-end equipment.

The invention discloses a slag charge for rare earth steel electroslag remelting and a preparation method, the slag charge comprises the following components in percentage by mass: 40%-60% of CaF2, 20%-35% of Al2O3, 5%-10% of CaO, 10%-15% of a rare earth mixture and 3%-5% of Na2O, the rare earth mixture is a mixture of Ce2O3 and La2O3, and the mass ratio of Ce2O3 to La2O3 is 2: (0.5-1.5); the preparation method comprises the following steps: selecting and pretreating raw materials, proportioning and pelletizing, and packaging slag balls for later use; the rare earth oxide is added into the slag charge, so that oxidation of rare earth in the electroslag remelting process can be inhibited, the yield of the rare earth is increased, the yield of the rare earth in steel is increased to 80%-90% and is increased by 20%-30% compared with that of traditional slag charge, and therefore the content of the rare earth in the steel can be more accurately controlled, and the stability and consistency of the performance of the rare earth steel are guaranteed.

The application relates to the technical field of alloy steel, in particular to a rare earth-containing high-strength corrosion-resistant cutter alloy steel and a preparation method thereof. Fe is used as a matrix, and the alloy steel contains C, Si, Mn, Cr, Mo, V, Nb, N, composite rare earth and TiB2, the contents of P and S are controlled in an extremely low range; the composite rare earth is a mixture of La and Ce, the content and form of inevitable impurities are strictly controlled, there is no coarse Al2O3 inclusion, and the non-metallic inclusions are spherical or spheroidal and small in size; the preparation method comprises raw material pretreatment, electric arc furnace smelting, AOD refining, electroslag remelting, homogenization annealing and hot forging, hot rolling, cold rolling and cryogenic treatment, tempering and post-treatment. The alloy component and the preparation process are optimized, the organization is refined, the inclusion form is improved, the matrix density and dislocation density are improved, the mechanical properties, corrosion resistance and wear resistance of the alloy are far superior to those of the prior art, and the balance between strength, toughness and corrosion resistance is achieved.

The invention relates to the field of forging processes, in particular to a forging method for integrally forming an austenitic stainless steel integral cylinder forge piece. The method comprises the steps that a forging material is obtained, and the procedures of electric arc furnace smelting, external refining and electroslag remelting are sequentially adopted; electroslag remelting is used as a key process, chemical components of a steel ingot are controlled, and values are controlled in the optimized chemical components; designing and manufacturing a mold; forging the forging material on a 5000-ton press machine; carrying out solid solution heat treatment according to technical requirements, and cooling in a water cooling manner; sampling the product, and carrying out performance detection on the sample; special regulations are formulated, and nondestructive testing is conducted on the forge piece; the forge piece is precisely machined through special machining equipment, and it is ensured that the product size meets the drawing requirement; the forging allowance can be reduced, the forging precision is improved, the machining amount of forgings is reduced, the research and development period is shortened, the production efficiency is improved, and the production cost of enterprises is greatly reduced.

The invention belongs to the technical field of alloy heat treatment, and particularly relates to a cobalt-based high-temperature alloy pipe, a preparation method and a high-temperature component. The invention discloses a preparation method of a cobalt-based high-temperature alloy pipe. The cobalt-based high-temperature alloy pipe comprises the following components in percentage by weight: 0.05%-0.15% of C, 0.2%-0.5% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 20.0%-24.0% of Cr, 20.0%-24.0% of Ni, 13.0%-16.0% of W, less than or equal to 3.0% of Fe, 0.02%-0.12% of La and the balance of Co and inevitable impurities. And then ingot casting, electroslag remelting, forging cogging, hot extrusion cogging, intermediate pipe cold machining, intermediate pipe solid solution heat treatment, finished product cold machining, finished product solid solution heat treatment and finishing are conducted, and finally the cobalt-based high-temperature alloy pipe is obtained.

The application relates to a forming method of high-strength and high-toughness duplex stainless steel seamless pipes, and steps of the method comprise the following: (1) blank preparation: arc furnace+AOD furnace refining+LF furnace refining+electroslag remelting smelting out of a cylindrical electroslag ingot; (2) electroslag ingot rough machining; (3) electroslag ingot heat treatment; (4) electroslag ingot finish machining; (5) hot expanding, expanding with a 2500-ton vertical expander; (6) hot extrusion: extruding the steel pipe with a 6300-ton horizontal extruder; (7) steel pipe heat treatment: heating to 1070 DEG C to 1120 DEG C, and water cooling to below 40 DEG C; (8) straightening and cutting; (9) pickling; (10) steel pipe grinding; (11) cold working: total reducing amount of the steel pipe is 15mm to 30mm; (12) finishing treatment: oil removal-inspection-spray mark-bundling. The duplex stainless steel seamless pipe is produced by combining the optimized composition, the electroslag ingot, the hot expanding, the hot extrusion and the cold working, the purity of the steel, the metal yield and the production efficiency are improved, and the product has high strength, high toughness and good corrosion resistance.

The invention discloses an ultra-pure tool and die steel electroslag remelting slag system and a remelting method, and belongs to the technical field of metallurgy, the ultra-pure tool and die steel electroslag remelting slag system comprises the following electroslag remelting slag materials by mass percent: 41.67-67.5% of CaF2; 15%-25% of Al2O3; 15%-25% of CaO; 1% to 3.33% of SiO2; and 1.5%-5% of MgO. Compared with a conventional ternary slag system, the electroslag remelting slag system has the advantages that the melting point is reduced by about 30-50 DEG C by properly increasing the content of SiO2 and MgO; and the purity of an electroslag ingot produced by adopting the electroslag remelting slag system is obviously improved, the number of inclusions is obviously reduced, the sizes of the inclusions are small, and the polishing performance of related mold products is obviously improved.