145 results about "Borium" patented technology

The invention relates to a control method for increasing the boron content in a forge piece through double-vacuum smelting of 2.25 Cr1Mo0.25 V steel, belongs to the technical field of smelting, and solves at least one of the problems that in an existing 2.25 Cr1Mo0.25 V steel smelting process, the boron content cannot reach the effective effect content, the boron content fluctuation between heat times is large, and an existing boron control process is incompatible with a 2.25 Cr1Mo0.25 V steel double-vacuum process. A control method for improving the boron content in a forge piece through double vacuum smelting of 2.25 Cr1Mo0.25 V steel comprises the steps that vacuum carbon deoxidation refining is conducted, specifically, slagging, diffusion deoxidation, alloying, vacuum treatment, component fine adjustment and soft blowing are conducted on molten steel, and key element adding is conducted; and the vacuum casting comprises preparation before casting and vacuum casting protection. According to the method, the effective boron content is increased, the boron content fluctuation among the heats is reduced, and the process compatibility is good.

The invention belongs to the technical field of metallurgical manufacturing, and particularly relates to boron microalloyed high-strength free-cutting steel and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.35%-0.45% of C, 0.10%-0.25% of Si, 1.0%-1.50% of Mn, 0.050%-0.060% of P, 0.20%-0.35% of S, 0.0005%-0.0030% of B, 0.05%-0.20% of Bi, 0.02%-0.06% of Ti, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Cu, less than or equal to 0.005% of N and the balance of Fe and inevitable impurities, wherein Ti / N is greater than or equal to 3.5. The whole-flow process control of converter-LF refining-continuous casting-controlled rolling and controlled cooling is adopted. The free-cutting round steel with the tensile strength reaching 800-1000 MPa is successfully produced, the cutting force is reduced by 20%-30%, and the service life of a cutter is prolonged by 40% or above.

The application relates to the technical field of bearing steel, in particular to a boronized bearing steel and a preparation method thereof. The boronized bearing steel comprises a base body and a boronized layer; the base body is 20CrNiMo steel and comprises the following components in percentage by weight: C 0.18-0.22wt%, Si 0.25-0.32wt%, Mn 0.75-0.83wt%, Cr 0.48-0.55wt%, Ni 0.50-0.70wt%, Mo 0.40-0.50wt%, V 0.18-0.21wt%, and the balance is Fe and inevitable impurities; the boronized layer is obtained through salt bath boronizing, the boronizing agent for the salt bath boronizing is mainly composed of Na2B4O7, Al and KCl, and the thickness of the boronized layer is 20-80 mu m. The application forms a boronized layer with a certain thickness on the surface of the base body through specific base body components and boronizing agents, and the surface hardness, wear resistance, strength and toughness of the bearing steel are significantly improved.

Non-grain-oriented electrical steel sheet, having a thickness of 0.30 mm to 0.38 mm and a composition comprising the following elements, expressed as weight percent: 0.0001% ≤ Carbon ≤ 0.007% 0.09% ≤ Manganese ≤ 0.15% 2.6% ≤ Silicon ≤ 2.95% 0.1% ≤ Aluminum ≤ 0.5% Phosphorus ≤ 0.15% Sulfur ≤ 0.006% Nitrogen ≤ 0.09% 0% ≤ Tin ≤ 0.04% and may contain one or more of the following optional elements: 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten ≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0% ≤ Nickel ≤ 1% 0% ≤ Boron ≤ 0.05% 0% ≤ Lead ≤ 0.2% 0% ≤ Antimony ≤ 0.2% wherein the remaining composition consists of iron and unavoidable impurities caused by processing, wherein the microstructure of the steel sheet consists of ferrite, comprising 80% to 100% recrystallized microstructure and 0% to 20% non-recrystallized microstructure in area fractions, wherein the average grain size of the recrystallized microstructure is 20 to 110 micrometers, and exhibiting a percentage of eddy current losses in the total iron losses, measured at 1 T and 400 Hz according to standards IEC 60404-2, of 35% to 45%, calculated according to the Bertotti method.

A cold-rolled steel sheet having a composition comprising 0.05% < = carbon < = 0.15%, 1.8% < = manganese < = 2.7%, 0.1% < = silicon < = 1%, 0.01% < = aluminum < = 0.8%, 0.1% < = chromium < = 0.9%, 0% < = phosphorus < = 0.09%, 0.0001% < = titanium < = 0.1%, 0.0005% < = boron < = 0.003%, 0.01% < = niobium < = 0.1%, 0% < = sulfur < = 0.09%, 0% < = nitrogen < = 0.09%, 0% < = vanadium < = 0.2%, 0% < = molybdenum < = 0.2%, 0% < = nickel < = 2%, 0% < = copper < = 2%, 0% < = calcium < = 0.005%, 0% < = cerium < = 0.1%, 0% < = magnesium < = 0.05%, the microstructure of the steel sheet contains, in area fraction, 40% to 60% of martensite, 15% to 40% of critical zone ferrite, 10% to 35% of cumulant transformed ferrite and bainite, and 0% to 5% of retained austenite.

This invention relates to the field of ferrous metallurgy technology and discloses a method for the reduction production of high-purity, low-oxygen-content sponge iron. The method includes: feeding pellets and reducing materials into a rotary kiln for preheating and forming a metallic iron shell on the surface; pulse-injecting a composite reducing liquid into a high-temperature solid-phase bed in a deep reduction zone; using a rotary encoder for feedback to perform dynamic phase-controlled injection, achieving gas-liquid linkage control and nitrogen cooling maintenance; and collecting the finished product through end-stage homogenization, cooling, and magnetic separation. Ammonia gas generated by the pyrolysis of the composite reducing liquid penetrates the metal layer for deep reduction, and a chemical shielding layer is constructed using boron-carbon bonds formed on the microporous surface of the iron matrix. This invention effectively improves the metallization rate of sponge iron, significantly inhibits secondary oxidation of the finished product during kiln exit and storage, and solves the technical problem of high and unstable residual oxygen content in sponge iron.

The invention discloses a directional solidification high-boron high-speed steel jet nozzle for oil field hydraulic power and a preparation method thereof, and belongs to the technical field of oil field exploitation equipment. The preparation method comprises the steps that raw materials such as electrical pure iron and micro-carbon ferrochrome are proportioned according to the specific mass fraction, and high-boron high-speed steel molten steel is obtained through vacuum melting; after the molten steel is subjected to rare earth aluminum desulfurization and temperature control, an as-cast blank is obtained through directional solidification treatment; and the cast blank is subjected to machining, austenitizing quenching, tempering heat treatment and fine polishing treatment, and a finished product is obtained. The finished product comprises a metal matrix and a directionally-arranged (Fe, Cr) 2B boride hard phase, alloy components are accurate and controllable, the hardness is 58.5-64.5 HRC, and the surface roughness is 0.25-0.40 mu m. The high-wear-resistance and high-brittleness high-wear-resistance and high-performance alloy nozzle has low cost and high performance, the problems that a traditional nozzle is poor in wear resistance, high in cost and large in brittleness are solved, the service life is remarkably prolonged, and the high-wear-resistance and high-brittleness high-wear-resistance and high-brittleness high-wear-resistance high-brittleness high-wear-resistance high-brittleness high-wear-resistance high-brittleness high-

The utility model relates to a drying device for boron diffusion heating furnace body production, which comprises a base, a vertical plate is arranged on the base, a drying box is fixedly mounted at the top end of the vertical plate, an adjusting mechanism is arranged in the drying box, a clamping mechanism is arranged on the adjusting mechanism, and a heating furnace body is clamped on the clamping mechanism. The adjusting mechanism comprises an adjusting assembly, the adjusting assembly comprises a first motor, and the first motor is fixedly installed at the bottom end of the drying box. Through the arrangement of the adjusting mechanism, the distance between the clamping mechanisms on the two sides is conveniently adjusted according to the size of the boron diffusion heating furnace body, so that the boron diffusion heating furnace body is effectively clamped by the clamping mechanisms, the purpose of clamping the boron diffusion heating furnace bodies with different inner diameters is achieved through the arrangement of the clamping mechanisms, drying of the boron diffusion heating furnace bodies is facilitated, and the drying efficiency of the boron diffusion heating furnace bodies is improved. And meanwhile, the boron diffusion heating furnace body can be driven to rotate, and the drying efficiency of the boron diffusion heating furnace body is improved.

The invention relates to the technical field of die steel processing, in particular to high-toughness die-casting die steel and a preparation method thereof.The high-toughness die-casting die steel is prepared from, by weight, 0.35%-0.40% of carbon, 0.20%-0.50% of silicon, 0.30%-0.45% of manganese, 5.10%-6.50% of chromium, 2.40%-3.00% of molybdenum, 0.60%-0.90% of vanadium, 0.03%-0.08% of niobium, 0.02%-0.06% of nickel, 0.001%-0.004% of boron, 0.02%-0.06% of rare earth elements, 0.001%-0.015% of phosphorus, 0.005%-0.008% of sulfur and the balance iron. According to the high-toughness die-casting die steel prepared through the formula, by optimizing alloy components and introducing trace alloying elements, center macrosegregation generated in the solidification process of a large-section module is restrained, and the uniformity of the material cross section performance is effectively improved. And especially in ultra-large die steel with the thickness larger than or equal to 300 mm, the transverse impact toughness is greatly improved. The steel type shows excellent thermal fatigue resistance and fracture toughness under the high-frequency thermal cycle service condition, generation and expansion of hot cracks are effectively delayed, and therefore the service life of an ultra-large die-casting die is prolonged, and the production shutdown cost is reduced.

The invention discloses an anti-oxidation special steel high-speed wire decarburization prevention material which is prepared from the following components in parts by weight: 30-50 parts of a component A, 30-50 parts of a component B, 10-30 parts of a component C, 10-30 parts of a component D and 5-10 parts of a pigment, the component A is internally provided with boron modified adamantane, epoxy bentonite, silicon phosphate, amino acid potassium and amino modified triazine, and the component D is internally provided with boron modified adamantane, epoxy bentonite, silicon phosphate, amino acid potassium and amino modified triazine. The component B is internally provided with nano graphene, polyvinyl alcohol, a transparent film and benzoic acid, and the component C is internally provided with SiO2, Al2O3, talcum powder and gypsum powder. After the product is brushed, a coating is compact, the texture is hard, no gap or void exists, the oxidation loss of steel and iron during heat treatment and the procedure of removing oxide skin are avoided through coating smearing, and the coating quality is improved. The specification and the size of the workpiece are more accurate; fatigue strength reduction caused by metal decarburization during heat treatment is avoided, surface gas absorption of metal during heat treatment is avoided, and metal embrittlement is prevented.

The invention relates to an amorphous lamination for improving magnetic flux and a preparation process thereof, and belongs to the technical field of motor manufacturing. According to the method, high-purity iron, boron, silicon, carbon, cobalt, copper, niobium and rare earth metal serve as raw materials, an amorphous alloy belt is obtained through single-roller rapid quenching belt manufacturing, and an amorphous structure with the grain size being 10-20 nm is formed through primary annealing and magnetic field auxiliary annealing and cooling to the room temperature; when the prepared amorphous lamination is used for a motor, magnetic flux can be improved, eddy current can be reduced, and therefore the torque density of the motor can be improved.

A cold rolled and coated steel sheet, the steel including, 0.15%≤carbon≤0.25%, 1.5%≤manganese≤2.5%, 1%≤silicon≤2%, 0%≤aluminum≤0.09%, 0.1%≤chromium≤0.6%, 0%≤phosphorus≤0.02%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.09%, 0%≤molybdenum≤0.5%, 0.001%≤niobium≤0.09%, 0%≤titanium≤0.06%, 0%≤vanadium≤0.1%, 0%≤nickel≤1%, 0%≤Copper≤1%, 0%≤calcium≤0.005%, 0%≤boron≤0.010%, 0%≤Magnesium≤0.05%, 0%≤Zirconium≤0.05%, 0%≤Cerium≤0.1%, and the balance including iron and unavoidable impurities, the steel sheet having a microstructure including 35% to 70% of cumulative presence of Bainite and Partitioned Martensite, 9% to 15% of residual austenite, 12% to 38% of ferrite and 5% to 15% fresh martensite in area fractions.

A hot rolled, ultra-high strength, complex metallographic structured or multi-phase structured steel that improves formability during stamping or forming process, while possessing one or more of the following properties: excellent castability, rollability and coatability, excellent structural performance, excellent stretch formability, excellent stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance, excellent intrusion and crash resistance without the purposeful addition of boron.

The application discloses an oil well pump of high-speed steel containing aluminum and boron and a preparation method thereof, and belongs to the technical field of metal materials. The preparation method comprises the following steps: taking pure iron, micro-carbon chromium iron, tungsten iron, boron iron, pig iron, vanadium iron, titanium iron and aluminum wire as raw materials, and obtaining high-speed steel melt through vacuum induction melting; graphite mold casting is carried out at 1400-1440 DEG C to obtain a cast blank; the cast blank is sequentially subjected to homogenizing annealing, austenitizing, deep undercooling treatment and tempering heat treatment, and finally the product is obtained. The oil well pump comprises the following chemical components in percentage by weight: Al: 1.06%-1.55%, C: 0.11%-0.25%, B: 1.76%-2.47%, and the microstructure is a tempered martensite matrix and (Fe,Cr)2B hard phase. The product has excellent corrosion resistance, wear resistance and service safety, and the cost is lower than that of traditional materials, can effectively resist downhole corrosion and erosion, prolong the service life of the oil well pump, and is suitable for downhole mining scenes in oil fields.

A non-heat treated cold rolled super plastic low density steel sheet comprising by weight 0.12% ≤ carbon ≤ 0.5%,3% ≤ manganese ≤ 9%,5% ≤ aluminum ≤ 9%,0% ≤ silicon ≤ 2%,0% ≤ phosphorus ≤ 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%,and the balance including iron and unavoidable impurities, the steel sheet having a microstructure comprising, in area fraction, 50% to 100% ferrite and 0% to 50% of austenite.

The invention provides a continuous casting square billet capable of guaranteeing hardenability and a preparation process thereof, and relates to the field of steel materials. The continuous casting square billet capable of ensuring the hardenability comprises the following components in percentage by weight: 0.24 to 0.27 percent of C, 0.20 to 0.30 percent of Si, 1.10 to 1.15 percent of Mn, less than 0.015 percent of P, less than 0.005 percent of S, 0.40 to 0.45 percent of Cr, less than 0.08 percent of Ni, less than 0.08 percent of Cu, less than 0.01 percent of Mo, less than 0.01 percent of Pb, less than 0.01 percent of Sn, 0.0020 to 0.0030 percent of B, 0.025 to 0.035 percent of Ti, 0.020 to 0.030 percent of Al, 0.004 to 0.006 percent of N, less than 0.0012 percent of O, less than 0.00015 percent of H and the balance of Fe and other inevitable substances. Wherein Ti / N is more than 4.0 and less than 8.0. In the invention, when Ti / N is more than 4.0 and less than 8.0, Ti can completely fix nitrogen in the steel; at the moment, boron is added and can be stably dissolved in the steel in a solid mode to form a large amount of effective boron, then the hardenability of the steel is improved through the effective boron, and finally the continuous casting square billet meeting the hardenability requirement is obtained.

The present invention provides a hot-stamped part including a base steel sheet containing 0.19 to 0.25% by weight of carbon (C), 0.1 to 0.6% by weight of silicon (Si), 0.8 to 1.6% by weight of manganese (Mn), 0.03% by weight or less of phosphorus (P), 0.015% by weight or less of sulfur (S), 0.1 to 0.6% by weight of chromium (Cr), 0.001 to 0.005% by weight of boron (B), 0.1% by weight or less of an additive, the remainder of iron (Fe), and other inevitable impurities, wherein the number of indentation dynamic strain aging in the indentation strain rate observed with respect to an indentation depth of 200 to 600 nm during nanoindentation testing is 26 to 40.

The invention relates to the technical field of steel and iron materials, in particular to a non-quenched and tempered pre-hardened steel type and a production process thereof, the steel type adopts a boron-titanium composite design, TiN is formed through titanium to fix nitrogen and protect boron, boron can replace precious metal nickel, and the cost is effectively controlled on the basis that the performance is guaranteed. The production process comprises the following steps: smelting, casting and forging molten steel to obtain a forging stock; the forging stock is subjected to normalizing treatment and heat preservation, and then the forging stock is cooled to the room temperature at the cooling rate of 0.05-3 DEG C / s; and then tempering treatment and heat preservation are conducted, the tempering treatment temperature ranges from 350 DEG C to 450 DEG C, then air cooling is conducted to the room temperature, and the non-quenched and tempered pre-hardened steel type is obtained. Through reasonable component design and the heat treatment technology, traditional quenching and tempering treatment are not needed, bainite phase change strengthening is utilized, and the non-quenched and tempered pre-hardened steel type with the hardness ranging from 32 HRC to 36 HRC can be directly obtained; and the pre-hardened steel type has high strength, good toughness and plasticity, has wide application prospects, and is particularly suitable for the fields of mold manufacturing, mechanical parts and the like.

The invention discloses a low-temperature steel flux-cored wire and a preparation method and application thereof, and belongs to the field of flux-cored wires. The flux-cored wire comprises a stainless steel strip and flux-cored powder filled in the stainless steel strip, and the flux-cored powder comprises, by mass, 37%-41% of electrolytic nickel powder, 18%-22% of metal chromium powder, 2.2%-3.2% of chromium nitride, 2.0%-3.5% of molybdenum powder, 16%-21% of electrolytic manganese powder, 1.6%-1.8% of pre-alloyed silicon-titanium-iron powder, 0.45%-0.55% of rare earth silicon iron, 0.6%-0.8% of vanadium nitride, 0.4%-0.6% of yttrium-stabilized zirconia, 0.08%-0.12% of boron-nickel alloy, 1.5%-2.0% of ferroniobium powder and the balance iron powder. And the balance iron powder. Through the design of the low-carbon and high-alloy flux core powder, the strength of a welding material is matched with that of a low-temperature steel base material, and good toughness, high strength and excellent corrosion resistance of the material are kept in an extremely low-temperature environment.

The invention relates to the technical field of metallurgical materials, and particularly discloses a method for refining a functional boron stainless steel sheet structure through large deformation machining. Comprising the following steps that S1, smelting is conducted, specifically, a steel ingot is prepared through a vacuum induction smelting and electroslag remelting duplex technology; s2, sheath forging: carrying out surface treatment on the steel ingot to obtain a blank, filling the blank into a steel sheath for packaging to form a blank with a sheath, and carrying out hot forging on the blank with the sheath to obtain a forged plate with the sheath; s3, sheath rolling: performing multi-pass hot rolling on the forged plate to prepare a hot-rolled thin plate with a sheath; s4, solution treatment: carrying out solution treatment on the hot-rolled sheet to obtain a solution-treated sheet; and S5, surface treatment is conducted, specifically, after a steel ladle sleeve of the thin plate subjected to solution treatment is removed, surface treatment is conducted, and the functional boron stainless steel thin plate with the needed specification and size is obtained. By means of the method, the boron stainless steel sheet which is excellent in mechanical property, uniform in thermal neutron absorption and suitable for being used as a structure / shielding integrated material can be prepared.

A hot rolled steel sheet having a composition comprising of the following elements 0.03% ≤ Carbon ≤ 0.070 %, 0.4 % ≤ Manganese ≤ 0.9%, 0.01% ≤ Aluminum ≤ 0.08 %, 0.01% ≤ Niobium ≤ 0.08%, 0.01 % ≤ Titanium ≤ 0.1%, 0.0005% ≤ Calcium ≤ 0.005%, 0% ≤ Phosphorus ≤ 0.03 %, 0 % ≤ Sulfur ≤ 0.015 %, 0 % ≤ Nitrogen ≤ 0.02%, 0.001% ≤ Silicon ≤ 0.09%, 0% ≤ Chromium ≤ 0.2%, 0.% ≤ Copper ≤ 0.25%, 0% ≤ Nickel ≤ 0.2%, 0% ≤ Molybdenum ≤ 0.2%, 0% ≤ Vanadium ≤ 0.1%, 0 % ≤ Boron ≤ 0.003%,0 % ≤ Magnesium ≤ 0.010%,0% ≤ Cerium≤ 0.1%, 0% ≤ Zirconium ≤ 0.010%,the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction 65% to 95% Ferrite, 5% to 35% Bainite, Pearlite up to 3%, martensite and residual austenite up to a cumulated fraction of 2%, wherein the said hot rolled steel sheet has an inclusion density of at least 100 inclusions per square micro-meter and the inclusions having a size of 2 microns or more being 30% or less of the total number of inclusions.

A hot rolled steel having a composition including comprising of the following elements 0.01%≤Carbon≤0.1%, 0.2%≤Manganese≤2%, 0.2%≤Silicon≤1.5%, 0.01%≤Aluminum≤2%, 0.1%≤Tin≤1%, 0.1%≤Copper≤0.5%, 0.001%≤Niobium≤0.1%, 0.002%≤Phosphorus≤0.02%, 0%≤Sulfur≤0.005%, 0%≤Nitrogen≤0.01%, with 0.3%≤Sn+Cu≤1.2% and can contain one or more of the following optional elements 0%≤Titanium≤0.1%, 0%≤Vanadium≤0.1%, 0%≤Chromium≤1%, 0%≤Molybdenum≤0.5%, 0%≤Calcium≤0.01%, 0%≤Boron≤0.01%, 0%≤Magnesium≤0.05%, 0%≤Calcium≤0.01%, 0%≤Cerium≤0.1%, 0%≤Boron≤0.05%, 0%≤ Nickel≤0.01%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet including in area fraction, 75% to 95% Ferrite, 1% to 15% Pearlite and optionally Bainite is between 0% and 25% wherein the average grain size of all the microstructural constituent is less than 15 microns.

A hot rolled steel sheet having a composition including the following elements, 0.18%≤Carbon≤0.3%, 1.8%≤Manganese≤4.5%. 0.8%≤Silicon≤2%, 0 001%≤Aluminum≤0.2%, 0.1%≤Molybdenum≤1%, 0.001%≤Titanium≤0.2%, 0.0001%≤Boron≤0.01%, 0%≤Phosphorus≤0.09%, 0%≤Sulfur≤0.09%, 0%≤Nitrogen≤0.09%, 0%≤Chromium≤0.5%, 0%≤Niobium≤0.1%, 0%≤Vanadium≤0.5%, 0%≤Nickel≤1%, 0%≤Copper≤1%, 0%≤Calcium≤0.005%, 0%≤Magnesium≤0.0010% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet including in area fraction, of at least 70% martensite, 8% to 25% residual austenite, wherein the shape factor of the residual austenite is between 4 and 12.

The invention relates to the technical field of electroslag remelting metallurgy, in particular to an electroslag steel production process capable of reducing burning loss of boron alloy elements, slag charge comprises the following components in percentage by mass: 30%-50% of CaF2, 30%-45% of Al2O3, 10%-25% of B2O3, 8%-12% of BaO and 0.5%-1% of BN; before electroslag remelting, the slag charge is baked for 60-100 min at the temperature of 300-400 DEG C, the slag charge is added into an electroslag furnace within 30 min after baking is stopped, the adding amount is controlled to be 0.8-1.2% of the mass of the remelting consumable electrode, the consumable electrode is inserted into the electroslag furnace containing the slag charge, the slag charge is molten to form a slag pool through electrifying heating, the remelting process of the consumable electrode is completed, and in the remelting process, the slag charge is subjected to heat preservation for 20-30 min; magnesium-aluminum alloy powder is continuously added into the electroslag furnace, the adding amount is controlled according to 300 g / h to 500 g / h, and 300 g to 500 g of ferroboron alloy particles are added into the electroslag furnace every 20 min to 30 min. According to the method, the burn-out rate of boron in the consumable electrode is reduced to 10% or below.

The invention belongs to the technical field of steelmaking refining, and particularly relates to a method for controlling boron element through deoxidation of boron-added steel, which comprises the following steps: S1, during converter tapping, molten steel is subjected to deoxidation treatment, and during tapping, a special slag surface deoxidizer is added for treatment, and 50-300kg of special slag surface deoxidizer is added; s2, LF refining deep deoxidation treatment is conducted, the aluminum content of molten steel ranges from 0.010% to 0.50%, and a special slag surface deoxidizing agent is used; s3, decarburization treatment is conducted through an RH vacuum furnace, and the decarburization oxygen blowing amount of the vacuum furnace is 50-300 Nm < 3 >; the method cooperates with vacuum breaking of an RH furnace for slag surface deoxidation again, protection of an ultra-low carbon heat preservation agent, stirring time, improvement of the internal quality of a continuous casting blank and good blank shape, the more important effect is achieved, the problem that the boron element of boron-added steel is low is solved in time, good fluidity of tundish molten steel can be continuously kept, the production efficiency is improved, and the production cost is reduced. And therefore, the quality of the ultra-low carbon boron-added steel continuous casting billet is obviously improved, and the production cost is directly and indirectly reduced.

The invention relates to boron-free low-residual-stress bainite wear-resistant steel and a preparation method, and belongs to the technical field of steel plate manufacturing. The wear-resistant steel comprises the following chemical components in percentage by mass: 0.20%-0.40% of C, 1.80%-2.20% of Mn, 1.40%-1.60% of Si, 0.90%-1.20% of Cr, 0.40%-0.70% of Al, 0.03%-0.06% of Ti, 0.05%-0.12% of V, 0.10%-0.50% of Mo, less than or equal to 0.01% of P, less than or equal to 0.006% of S, 0.010%-0.018% of N and a matrix element Fe, wherein the carbon equivalent is 0.58%-0.75%. Through the design of boron-free alloy components, boron element addition is canceled, the temperature control quenching process is combined to precisely regulate and control the bainite phase change path, and the medium-temperature tempering treatment is assisted, so that the residual stress is remarkably inhibited, and meanwhile, the synergistic improvement of high hardness and high toughness of the bainite wear-resistant steel is realized.

A cold rolled and heat treated steel sheet having a composition including the following elements: 0.1%≤Carbon≤0.5%, 1%≤Maganeses≤3.4%, 0.5%≤Silicon≤2.5%, 0.01%≤Aluminum≤1.5%, 0.05%≤Chromium≤1%, 0.001%≤Niobium≤0.1%, 0%≤Sulfur≤0.003%, 0.002%≤Phosphorus≤0.02%, 0%≤Nitrogen≤0.01%, 0%≤Molybdenum≤0.5%, 0.001%≤Titanium≤0.1%, 0.01%≤Coppers≤2%, 0.01%≤Nickel≤3%, 0.0001%≤Calcium≤0.005%, 0%≤Vanadium≤0.1%, 0%≤Boron≤0.003%, 0%≤Ceriurm≤0.1%, 0%≤Magnesium≤0.010%, 0%≤Zirconium≤0.010% the remainder composition being composed of iron and the unavoidable impurities, and a microstructure of the rolled steel sheet includes by area fraction, 10% to 60% Bainite, 5% to 50% Ferrite, 5% to 25% Residual Austenite, Martensite 2% to 20%, Tempered Martensite 0% to 25%, the balance being Annealed Martensite, which content shall be from 1% to 45%.

A cutting tool includes a substrate and a hard layer disposed on the substrate. The hard layer comprises a first unit layer and a second unit layer, wherein the first unit layer and the second unit layer are alternately stacked in one or more layers. The thickness of the first unit layer is 2 nm or more and 100 nm or less, and the thickness of the second unit layer is 2 nm or more and 100 nm or less. The first unit layer is made of Ti. a Al b B c The compound shown in N is composed of the second unit layer, which is made of Ti. d Al e B f The compound represented by N is composed of the above Ti. a Al b B c The atomic ratio 'a' of titanium in N is greater than 0.25 and less than 0.45. The aforementioned Ti... a Al b B c The atomic ratio of aluminum in N is greater than or equal to 0.55 and less than 0.75. The above-mentioned Ti... a Al b B c The atomic ratio c of boron in N is greater than 0 and less than 0.1, and the total of the above atomic ratios a, b, and c is 1. The above Ti... d Al e B f The atomic ratio d of titanium in N is greater than 0.35 and less than 0.55. The above-mentioned Ti d Al e B f The atomic ratio of aluminum in N is greater than 0.45 and less than 0.65, and the above-mentioned Ti d Al e B f The atomic ratio f of boron in N is greater than 0 and less than 0.1. The total of the above atomic ratios d, e, and f is 1. The above atomic ratios a and d satisfy 0.05 ≤ d - a ≤ 0.2. The above atomic ratios b and e satisfy 0.05 ≤ b - e ≤ 0.2.

The invention relates to the technical field of steel smelting, and discloses a grain refining smelting process of 20CrMnTiSH1-H5 steel, which comprises the following steps: S1, a raw material pretreatment stage, S2, a converter smelting stage, S3, a refining purification stage, S4, a continuous casting process optimization stage, S5, a heating and refining auxiliary stage and S6, a quality inspection and control stage. By strictly screening high-purity raw materials (the purity of waste steel is larger than or equal to 99.5%), removing impurities through magnetic separation and accurately proportioning low-boron pre-melted slag (the alkalinity is 3.5-5.0), the content of phosphorus, sulfur and boron harmful elements and non-metallic inclusions is effectively reduced, the impurities are fully adsorbed by the pre-melted slag, and a pollution source is eliminated for subsequent grain refinement; through double purification of the raw materials and the pre-melted slag, the size of inclusions in the steel is smaller than or equal to 8 microns, and a clean matrix is provided for uniform growth of crystal grains.

This invention relates to a high-entropy tetraboron / hexaboride material and its preparation method, belonging to the field of ultra-high temperature ceramic materials technology. The nominal molecular formula of the material is (Y0). 0.2 La 0.2 Ho 0.2 Er 0.2 Yb 0.2 )B4 / (Y 0.2 La 0.2 Ho 0.2 Er 0.2 Yb 0.2 B6, and (Y) 0.2 La 0.2 Ho 0.2 Er 0.2 Yb 0.2 B4 and (Y) 0.2 La 0.2 Ho 0.2 Er 0.2 Yb 0.2 The mass ratio of B6 is 38.91–49.50:61.09–50.05. The raw material powder is wet-mixed using an acoustic resonance mixer until homogeneous, then dried; subsequently dry-pressed and calcined under vacuum at a constant temperature. When powder production is required, the agglomerates are broken up using the acoustic resonance mixer. This invention, by adjusting the elemental ratio, synthesizes La-based high-entropy boride powder for the first time. The resulting material has clear crystal morphology, controllable proportions, and uniform elemental distribution, retaining both high-entropy solid solution components and good thermal stability. Compared to single-component materials, this material exhibits superior oxidation resistance due to selective oxidation during the high-entropy effect. The preparation method can uniformly disperse the raw material powder, is simple, and easily scales up production.