200 results about "Borium" patented technology

The invention relates to the technical field of flux-cored wires. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 4-6 parts of chromium carbide powder, 7-9 parts of molybdenum powder, 6-8 parts of nickel powder, 10-15 parts of niobium powder, 15-18 parts of tungsten carbide powder, 7-11 parts of a modified titanium carbide agent, 5-8 parts of a blending agent added based on boron and 2-4 parts of 30-mesh natural graphite; 1-2 parts of sodium fluosilicate; 1-2 parts of aluminum powder; and 70-75 parts of iron powder. The flux-cored wire can adapt to complex service environments of parts such as rollers and continuous casting crystallizers in the metallurgical industry, the service life of the parts subjected to surfacing repair is prolonged, the production efficiency of the parts subjected to surfacing repair is improved, the obtained flux-cored wire achieves balance of high-temperature performance, mechanical performance and low-temperature stability, and the comprehensive applicability of products is improved.

The invention discloses high magnetic induction oriented silicon steel and a production method. The high magnetic induction oriented silicon steel comprises the following components in percentage by weight: 0.032 to 0.065 percent of C, 2.58 to 4.02 percent of Si, 0.014 to 0.036 percent of Als, 0.021 to 0.043 percent of Mn, 0.0015 to 0.014 percent of Nb, 0.0015 to 0.0084 percent of B, 0.0037 to 0.0081 percent of N and 0.004 to 0.015 percent of S. A large amount of B element is added, a proper amount of BN and other congenital inhibitors can be provided, the situation that primary grains are too large is effectively avoided, meanwhile, boron oxide, boric acid and borate are added into the magnesium oxide additive, an acquired inhibitor can be generated with N, an AlN + BN double-inhibitor system is formed, and the stability of magnetic performance is guaranteed; and the temperature is kept at 910-1005 DEG C for 18-25 hours, so that B is fully diffused and forms a new BN inhibitor with N, and the stability of the magnetic performance is effectively improved.

The invention discloses a heat treatment process for improving the obdurability of die steel, and belongs to the technical field of metal heat treatment. The invention relates to a heat treatment process for improving the toughness of die steel, which adopts a die steel material with a specific component proportion, and the die steel material comprises carbon, chromium, molybdenum, vanadium, tungsten, nickel, niobium, niobium carbide and trace boron element. By sequentially implementing austenitizing, quenching, deformation heat treatment, multi-stage subzero treatment, pulsed magnetic field assisted tempering, gradient surface hardening and nano-precipitation regulation treatment, the hardness and toughness of the die steel are remarkably improved. Particularly, through the synergistic effect of multiple advanced heat treatment means, the martensite structure is effectively refined, carbide precipitation is strengthened, the surface hardness and the core toughness are improved, the comprehensive performance of toughness and toughness is achieved, and the method is suitable for the field of high-performance injection molds and hot-working molds.

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.

The invention relates to the technical field of hard alloys, and particularly discloses a ruthenium boride reinforced ultra-ultra coarse grain WC-Co hard alloy and a preparation method thereof in order to solve the problems of low strength and hardness and poor toughness of an ultra-ultra coarse grain alloy product caused by difficult control of grain size in an existing ultra-ultra coarse grain alloy preparation process. The ultra-coarse grain WC-Co hard alloy comprises the following raw materials: 0.5-5% of ruthenium-boron mixed powder, 5-10% of cobalt powder and the balance of tungsten carbide particles. Wherein the number ratio of ruthenium atoms to boron atoms in the ruthenium-boron mixed powder is 1: (0.5-1.5), and the carbon adjusting range of the total mass of tungsten and carbon in the tungsten carbide particles is 6.08-6.20 wt%. The problems that WC particles are excessively crushed and Co phases are non-uniformly distributed are solved by utilizing high-energy stirring dry mixing without adding a grinding body and combining a flexible wet grinding process with extremely short time and extremely low ball-to-material ratio, and Ru powder and B powder are introduced and combined with a special sintering process, so that the effects of high toughness, high hardness, high heat conductivity and the like of the ultra-coarse grain alloy are achieved.

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.

Double-rolled non-grain-oriented electrical steel sheet, having a thickness of 0.28 mm to 0.32 mm and having a composition comprising the following elements, expressed as weight percent: 0.0001% ≤ Carbon ≤ 0.007% 0.2% ≤ Manganese ≤ 0.24% 3.1% ≤ Silicon ≤ 3.5% 0.8% ≤ Aluminum ≤ 1.1% Phosphorus ≤ 0.15% Sulfur ≤ 0.006% Nitrogen ≤ 0.09% 0.01% ≤ Chromium ≤ 1% 0.01% ≤ copper ≤ 1% and may contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten ≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0.001% ≤ Nickel ≤ 0.04% 0% ≤ Boron ≤ 0.05% 0% ≤ Lead ≤ 0.2% 0% ≤ Tin ≤ 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 to the total iron losses, measured at 1 T and 400 Hz according to standards IEC 60404-2, of 30% to 35%, calculated according to the Bertotti method, and simultaneously a magnetic polarization at 5000 A / m (J50) of 1.645 T to 1.660 T.

A hardened slip and a method of making the hardened slip are disclosed. A method of hard surfacing a slip component for a downhole tool is disclosed. The slip component may have a bearing surface and may be composed of a base material, the base material being metallic. The method may comprise steps of positioning at least the bearing surface of the slip component with a direct contact with a boron source; bonding an external layer at least on the bearing surface to form a metallurgical bond between boron from the boron source with the base material by boriding the base material; and maintaining a bulk temperature of the slip component below a melting point of the base material.

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 invention discloses a neutral ramming material for an intermediate frequency furnace, and belongs to the technical field of steel smelting. Comprising the following raw materials in parts by weight: 35-40 parts of microporous sintered corundum particles with the particle size of 3-5mm, 35-40 parts of microporous sintered corundum particles with the particle size of 1-3mm, 20-25 parts of magnesium aluminate spinel particles with the particle size of 1-3mm, 9-11 parts of activated aluminum oxide micro powder, 5-7 parts of modified cordierite fine powder, 1-2 parts of pretreated boron nitride, 0.5-1.5 parts of nano aluminum oxide and 0.2 part of nano aluminum oxide. 0.4 part by weight of zinc borosilicate glass powder, 0.6-0.8 part by weight of high-temperature organic silicon resin and 0.05-0.1 part by weight of anti-burst fiber. The prepared neutral ramming material for the intermediate frequency furnace has good compression strength, thermal shock resistance and slag resistance.

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 discloses a processing technology of a high-strength nano modified glaze enameled steel plate, which comprises the following steps: mixing nano Al2O3 and nano ZrO2 according to a mass ratio of 3: 1, carrying out ultrasonic dispersion, and mixing and grinding with borosilicate base glaze; the high-strength low-carbon steel plate is pretreated, and phosphating treatment with specific parameters is included; the glaze is coated by electrostatic spraying, and three-stage firing is carried out after drying. According to the nano-composite system, the hardness and toughness are synergistically improved, and the problems of nano-particle aggregation, poor adaptability of high-strength steel plate enamel and the like are solved by combining a nano-dispersion process, an interface collaborative design and a precise sintering system.

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.

The invention discloses a high-strength steel member which is alloyed by a Fe matrix and comprises the following components in percentage by weight: 0.35%-0.45% of carbon (C), 12%-15% of manganese (Mn), 8%-10% of nickel (Ni), 1.8%-2.2% of molybdenum (Mo), 0.08%-0.12% of nitrogen (N), 0.03%-0.08% of rare earth elements, 0.02%-0.05% of boron (B) and the balance of iron (Fe) and inevitable impurities. Alloy elements with specific content are added into a Fe matrix, and the elements interact with the Fe matrix, so that the microstructure and the performance of the Fe matrix are changed; carbon and nitrogen can form carbides and nitrides to play a role in precipitation strengthening; manganese and nickel can improve the hardenability of the steel; molybdenum can improve the strength and toughness of the steel; and the rare earth elements can refine grains, so that the steel member has high strength, high toughness and good corrosion resistance.

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.

The invention discloses radiation shielding type high-strength ceramsite based on lead-zinc ore tailings and a preparation method of the radiation shielding type high-strength ceramsite, and relates to the technical field of radiation protection concrete. The lead-zinc ore tailings containing more Pb elements are used as main ceramic forming raw materials, a proper amount of lead-rich raw materials are used as auxiliary materials to adjust the content of the Pb elements, a proper amount of boron-rich raw materials are used as auxiliary materials to adjust the content of the B elements, and the composite powder with the proper content of the Pb elements and the proper content of the B elements is prepared. The efficient shielding effect of the Pb element and the B element on gamma rays and neutron radiation is fully exerted, and the sintering temperature of the ceramsite is remarkably reduced. In addition, a proper amount of fly ash floating beads with spheroidal cavity structures are introduced as a pore-forming template, so that the purpose of regulating and controlling the density grade of the ceramsite is achieved, and the problem that the concrete structure is not uniform due to the fact that the density of aggregate is not matched with that of a cementing material is solved. The prepared ceramsite has relatively high strength and a good radiation shielding coefficient, and has a density similar to that of a cementing material.

Non-grain-oriented electrical steel sheet, having a thickness of 0.29 mm to 0.4 mm and a composition comprising the following elements, expressed as weight percent: 0.0001% ≤ Carbon ≤ 0.007%, 0.15% ≤ Manganese ≤ 0.2%, 3% ≤ Silicon ≤ 3.6%, 0.7% ≤ Aluminum ≤ 1.3%, Phosphorus ≤ 0.15%, Sulfur ≤ 0.006%, Nitrogen ≤ 0.09%, with 3.85% ≤ Si+Al+Mn ≤ 5.5%, 0.01% ≤ Copper ≤ 1%, 0.01% ≤ Nickel ≤ 1%, 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% ≤ Boron ≤ 0.05% 0% ≤ Lead ≤ 0.2% 0% ≤ Tin ≤ 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 is ferrite consists,and comprises 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 µm to 110 µm, and a percentage of eddy current losses in relation to the total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2, of less than 35% when calculated using the Bertotti method, and simultaneously exhibits a magnetic polarization at 5000 A / m (J50) of 1.635 T to 1.670 T.

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.

An iron-based alloy composition including: boron (B): 1.6-2.4 wt. %; carbon (C): 2.2-3.0 wt. %; chromium (Cr): 3.5-5.0 wt. %; manganese (Mn): below 0.8 wt. %; molybdenum (Mo): 16.0-19.5 wt. %; nickel (Ni): 1.0-2.0 wt. %; silicon (Si): 0.2-2.0 wt. %; vanadium (V): 10.8-13.2 wt. %; and balanced with iron (Fe). Further, an item including a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.

An iron-based alloy composition including: boron (B): 1.6-2.4 wt. %; carbon (C): 1.7-3.0 wt. %; molybdenum (Mo): 16.0-19.5 wt. %; nickel (Ni): 3.5-6.5 wt. %; manganese (Mn): below 0.8 wt. %; silicon (Si): 0.2-3.0 wt. %; vanadium (V): 10.8-13.2 wt. %; and balanced with iron (Fe). Also, an item including a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.