444 results about "Chemical element" patented technology

The invention discloses a high-carbon steel wire rod with long fatigue life, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.80 to 0.85 percent of C, 0.20 to 0.30 percent of Si, 0.70 to 0.80 percent of Mn, 0.01 to 0.02 percent of Ni, 0.10 to 0.20 percent of Cr, 0.01 to 0.03 percent of Nb, 0.01 to 0.03 percent of V, 0.003 to 0.007 percent of Ce and the balance of Fe. The volume content of sorbite in the microstructure is higher than 95%, and the lamellar spacing of the sorbite is 80-200 nm. Correspondingly, the invention further discloses a wire rod prepared from the high-carbon steel wire rod and a manufacturing method of the high-carbon steel wire rod and the wire rod.

The invention discloses a preparation method of a ferronickel standard sample containing high-content harmful elements and the standard sample. The ferronickel standard sample contains the following chemical elements in percentage: 34.00-36.00% of Ni; fe: 64.00% to 66.00%; the content of As is 0.009%-0.011%; 0.009% to 0.011% of Sb; sn: 0.005% to 0.007%; pb: 0.005% to 0.007%; 0.002% to 0.004% of Bi; c: 0.10% to 0.20%; 0.50% to 0.60% of Si; 0.10% to 0.20% of Mn; 0.010% to 0.020% of P; s: 0.006% to 0.007%; 0.30% to 0.40% of Cr; cu: 0.04% to 0.05%; 0.60% to 0.70% of Co; 0 to 0.0020 percent of N; the balance is unavoidable impurities; the preparation method comprises the steps of standard sample smelting, standard sample preparation, segregation detection, standard sample turning and packaging, sampling detection, uniformity detection, constant value analysis and mathematical statistics. And meanwhile, the types and contents of the added harmful elements can meet the requirements of design and uniformity, and the use requirements of customers and markets are met.

Disclosed in the present disclosure is a steel. Apart from 90% or more by mass Fe and inevitable impurities, the steel further contains the following chemical elements in percentage by mass: C: 0.22-0.33%, Si: 0.1-1.0%, Mn: 0.3-1.5%, Cr: 0.2-1.6%, Ni: 2.2-3.8%, Mo: 0.1-0.7%, Cu: 0.02-0.3%, Al: 0.01-0.045%, V: 0.01-0.25%, and N≤0.013%. Further disclosed in the present disclosure is a method for manufacturing the steel, comprising: (1) smelting and casting; (2) forging or rolling, involving processing a casting blank to a finished product size by using a roll-in-one-heat process or roll-in-two-heat process; and (3) quenching and tempering: wherein the heating temperature of quenching is 860-1000° C., the holding time is 2-6 h, and water cooling is performed after the quenching; and the tempering temperature is 400-600° C., the holding time is 1-4 h, and air cooling to room temperature is performed after tempering. The steel of the present disclosure has high strength, well matched toughness and plasticity, and good weather resistance, thereby having good application prospects.

Disclosed in the present invention is a high-strength, high-toughness and high-hardenability gear shaft steel. The steel contains Fe and inevitable impurities, and the following chemical elements in percentage by mass: C: 0.16%-0.22%, Si: 0.10%-0.40%, Mn: 0.86%-1.24%, Cr: 0.95%-1.44%, Al: 0.02%-0.05%, Ti: 0.015%-0.039%, Nb: 0.001%-0.034%, N: 0.006%-0.015%, and B: 0.0006%-0.0034%, wherein a microalloying element coefficient rM / N of the steel ranges from 1.5 to 5.0, and rM / N=(10*[Nb] / 93+[Ti] / 480+[Al] / 27) / ([N] / 14). In addition, further disclosed in the present invention is a manufacturing method for the high-strength, high-toughness and high-hardenability gear shaft steel. The high-strength, high-toughness and high-hardenability gear shaft steel of the present invention has high hardenability, narrow hardenability bandwidth, and good high-temperature grain stability.

The present invention relates to the technical field of powder metallurgy materials and intelligent manufacturing, and relates to a high-toughness ultrahigh-strength martensitic stainless steel material, and a manufacturing method therefor and a use thereof. The material is composed of the following chemical elements: 7.0-9.0 wt% of Cr, 7.1-9.0 wt% of Ni, 9.0-14.0 wt% of Co, 5.5-7.0 wt% of Mo, 0.05-0.5 wt% of Nb, less than or equal to 0.03 wt% of C, the balance being Fe, and inevitable impurity elements. According to the material of the present invention, by using an injection molding process, the yield strength of the martensitic stainless steel reaches 1900 MPa or above, and the elongation is greater than 5%, and particularly, the elongation is greater than 5% while the yield strength is greater than 2000 MPa.

The invention discloses titanium-containing high-manganese ultralow-temperature steel as well as a preparation method and application thereof. The ultralow-temperature steel comprises the following chemical components in percentage by weight: 0.35%-0.55% of C, 0.11%-0.22% of Si, 22.5%-25.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 3%-4% of Cr, 0.03%-0.1% of Ti, 0.01%-0.1% of Alt, 0.0003%-0.005% of Ca and the balance of Fe and other inevitable impurities. Chemical elements are combined with rolled steel, the low-temperature strength and corrosion resistance of the steel plate at the temperature of-269 DEG C are emphatically improved, precious metal elements such as Ni, Mo and Cu and post-treatment procedures are omitted, and the steel plate has excellent ultralow temperature resistance and economical efficiency; the device has application prospects in storage and transportation of liquefied ethylene, liquefied natural gas, liquid hydrogen, liquid helium and other ultralow-temperature media in land, ocean, aviation and other complex environments.

The invention relates to the field of electrochemical polishing of cobalt-based alloys, in particular to an environment-friendly electrochemical polishing solution of a cobalt-chromium-tungsten-nickel alloy and a polishing method of the environment-friendly electrochemical polishing solution. The cobalt-based alloy comprises the following chemical elements in percentage by mass: 15.0-25.0% of Cr; w: 10.0% to 20.0%; 0.0% to 15.0% of Ni; the balance is Co and unavoidable impurity elements such as O, N and H. The environment-friendly polishing solution comprises the following chemical components by mole percent: 0.5-2 mol / L of ChCl; 0.7 to 1.0 L of ethylene glycol; 0 to 0.3 L of ethanol; 0.1 to 0.3 L of glacial acetic acid; and a small amount of citric acid. According to the electrolytic polishing, alloy serves as an anode, a U-shaped titanium plate serves as a cathode, the voltage is 40-60 V, the current density is 0.5-2 A / cm < 2 >, and the polishing temperature is normal temperature. The method has the advantages that the environment-friendly electrolyte is adopted, the surface of the cobalt-chromium-tungsten-nickel alloy can be polished, pollution caused by electrolyte of a traditional chromium oxide system and an acid system is avoided, the follow-up repeated cleaning procedure is reduced, and material precision control is improved.

The invention belongs to the technical field of chemical element detection, and provides a method for measuring arsenic content in wires, cables and materials by X-ray fluorescence spectrometry. The method comprises the following steps: S1, performing pretreatment on a wire and cable sheath or an insulating layer to obtain a to-be-tested sample; s2, respectively obtaining a plurality of standard samples and corresponding arsenic element contents; s3, respectively carrying out X-ray fluorescence spectrum testing on the plurality of standard samples under set testing conditions to obtain fluorescence intensity of the plurality of standard samples; s4, obtaining a calibration curve according to the fluorescence intensity and the arsenic element content of the plurality of standard samples; s5, performing X-ray fluorescence spectrum testing on the to-be-tested sample under set testing conditions to obtain the fluorescence intensity of the to-be-tested sample; and S6, obtaining the arsenic element content in the to-be-tested sample according to the fluorescence intensity and the calibration curve of the to-be-tested sample. Therefore, the arsenic element content in wires, cables and materials can be accurately and quickly measured.

The invention discloses medium-carbon round steel for cold extrusion, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.36 to 0.43 percent of C, 0.1 to 0.4 percent of Si, 0.6 to 1 percent of Mn, 0.6 to 1 percent of Cr, 0.2 to 0.4 percent of Mo, 1.4 to 1.7 percent of Ni, 0.02 to 0.04 percent of Al, 0.008 to 0.015 percent of N and the balance of Fe. And after annealing, the microstructure is flaky pearlite and spherical pearlite. Correspondingly, the invention also discloses a manufacturing method of the medium-carbon round steel for cold extrusion, which comprises the following steps: (1) smelting and casting; (2) heating; (3) forging or rolling; (4) stepped annealing; and (5) surface treatment.

The invention relates to the technical field of pipeline steel for oil and gas transmission, in particular to a novel low-C low-Cr corrosion-resistant pipeline steel plate, a preparation method and a pipeline steel pipe, and the novel low-C low-Cr corrosion-resistant pipeline steel plate comprises the following chemical elements: less than or equal to 0.03 wt% of C, less than or equal to 0.025 wt% of Sb, 0.50-1.20 wt% of Al, 0.0005-0.0012 wt% of Mg, 0.0012-0.0042 wt% of Ca, less than or equal to 0.50 wt% of Cr, 0.10-0.30 wt% of Ni, 0.10-0.30 wt% of Si, 1.20-1.80 wt% of Mn, 0.10-0.30 wt% of Mo, 0.02-0.06 wt% of Nb, 0.03-0.08 wt% of V, 0.01-0.03 wt% of Ti, less than or equal The manufactured steel plate is low in manufacturing cost, excellent in yield strength, tensile strength, ductility, impact toughness, corrosion resistance, hydrogen induced cracking resistance and other mechanical properties and suitable for seabed and land oil and gas conveying pipeline engineering in the high Cl <-> and CO2 / H2S corrosion environment.

Disclosed in the present invention is high-strength and high-hardness reinforced wear-resistant steel, comprising Fe and inevitable impurities, and further comprising the following chemical elements in percentage by mass: C: 0.22-0.33%; Si: 0.10-1.00%; Mn: 0.50-1.80%; Cr: 0.80-2.30%; Al: 0.010-0.10%; RE: 0.01-0.10%; W: 0.01-1.0%; and at least one of MO: 0.01-0.80%, Ni: 0.01-1.00%, Nb: 0.005-0.080%, V: 0.01-0.20%, and Ti: 0.001-0.50%. In addition, further disclosed in the preset invention is a manufacturing method for the high-strength and high-hardness reinforced wear-resistant steel, comprising the steps of: (1) smelting and casting; (2) heating; (3) rolling; and (4) on-line quenching: wherein the cooling start temperature of primary cooling is (Ar3′+5)-(Ar3′+50)° C., M90<final cooling temperature<Bs, and the cooling speed is 2-15° C. / s; and then performing air-cooling to room temperature.

Described is a method for detecting trace metal anomalies in soil. Soil samples are collected from an area of interest. The soil samples are prepared such that particle size and moisture content of each soil sample is normalized. An extraction solution having an amount of a carboxylic acid, an amount of a chelating agent, and an amount of a strong base is prepared. Using the extraction solution, a soil extract is obtained from each soil sample. Using a spectral instrument, a spectral analysis of each soil extract is performed to detect a chemical element. Based on the spectral analysis, presence of a hydrocarbon microseepage in the area of interest is determined.

The invention relates to an artificial intelligence generation method and system for a ferroelectric material component-temperature phase diagram, and the method comprises the steps: obtaining a chemical formula of a ferroelectric material with a doping variable, and setting the chemical formula in a character string form; setting a doping proportion, a temperature change range and a step length; chemical elements and doping proportions in the chemical formula of the ferroelectric material with the doping variable in the character string form are processed, and a chemical formula numerical vector list is obtained; forming a temperature list according to the set temperature change range and step length, and performing normalization processing to obtain a normalized temperature list; based on the chemical formula numerical vector list and the normalized temperature list, merging, inputting into a pre-trained crystal phase transformation artificial intelligence model, and outputting a crystal structure type; based on the type of the crystal structure, drawing a component-temperature phase diagram of the chemical formula of the ferroelectric material with the doping variable under different doping proportions and different temperature conditions; compared with the prior art, the method has the advantages of automatically generating the component-temperature phase diagram and the like.

The invention discloses a high-strength carbon dioxide corrosion resistant oil casing pipe, which contains Fe and inevitable impurities, and further contains the following chemical elements: 0.10 to 0.20 percent of C, 0.10 to 0.80 percent of Si, 0.10 to 1.50 percent of Mn, 3 to 5 percent of Cr, 0.10 to 0.70 percent of Mo, 0.01 to 0.10 percent of Al, 0.10 to 0.20 percent of V, 0.1 to 1.0 percent of Ni, 0.002 to 0.01 percent of Ce and 0.002 to 0.01 percent of La. Correspondingly, the invention further discloses a manufacturing method of the high-strength carbon dioxide corrosion resistant oil casing. Through reasonable chemical element composition design, the oil casing with ultrahigh strength and excellent carbon dioxide corrosion resistance can be obtained.

The present invention relates to a pipeline steel and a manufacturing method therefor. In addition to Fe and inevitable impurities, the pipeline steel further contains the following chemical elements in percentage by mass: 0.015-0.040% of C, 0.10-0.30% of Si, 1.18-1.45% of Mn, 0<P≤0.008%, 0<S≤0.0010%, 0.05-0.35% of Cu, 0.05-0.30% of Ni, 0.15-0.30% of Cr, 0.02-0.09% of Mo, 0.025-0.055% of Nb, 0.005-0.020% of Ti, 0.0010-0.0040% of Ca, 0.010-0.040% of Alt, 0<B≤0.0004%, 0<O≤0.0026%, 0<N≤0.0050%, 0<H≤0.0002%, 0<Sn≤0.0050%, 0<Sb≤0.0025%, 0<Bi≤0.0030%, 0<Pb≤0.0050%, and 0<As≤0.0030%, and the chemical elements satisfy: Nb+Ti≤0.07%; Ca / S≥2; Cu+Ni+Cr+Mo≤0.80%; 0<N+O+H≤0.0070%; and 0.7≤(Nb+27.5*Ti) / (5C+27*N)≤5.0; a hydrogen induced cracking (HIC) sensitivity coefficient Ks≤0.23, and Ks=8.0C+24S-Alt-2.3Nb+2.8Ti+117B+0.34Ni-0.30Mo+24.5N-0.19. The obtained pipeline steel can reach an X60 / X65 strength level, and has good low-temperature toughness, and excellent HIC resistance and SSC resistance.

The invention provides an aluminum alloy material and a manufacturing method thereof, the aluminum alloy material is used for semiconductor equipment, the aluminum alloy material contains Al and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.5-0.7% of Si, 0.05-0.15% of Fe, 0.2-0.3% of Cu, less than or equal to 0.15% of Mn, 0.8-1.2% of Mg, 0.15-0.35% of Cr, and the balance of Al and inevitable impurities. Fe / Si is greater than or equal to 0.08 and less than or equal to 0.28, and Mg / Si is greater than 1.73 and less than 1.83. According to the aluminum alloy material, the mass percentage content of Fe is limited to be 0.05-0.15%, and Fe / Si is larger than or equal to 0.08 and smaller than or equal to 0.28, so that the Fe content and the Fe / Si ratio are controlled within a proper range, and the precipitation number of an AlFeSi phase in the casting process can be reduced on the basis of ensuring that the mechanical property is not lost.

The invention relates to a novel 3D printing nickel-based superalloy and a preparation method thereof, and belongs to the technical field of metal materials, and the nickel-based superalloy comprises the following chemical elements in percentage by mass: 20.5-24% of W (Cr), 18-22% of W (Co), 0.01-0.2% of W (C), 0.01-0.2% of W (Zr), 1.0-3.0% of W (W), 0.01-1.0% of W (Mo), 1.5-2.5% of W (Al), 3.0-5.0% of W (Ti), 0.5-1.5% of W (Nb), 1-1.5% of W (Ta) and the balance of Ni. By improving the alloy components and optimizing the alloy forming process, the high-temperature bearing capacity and the high-temperature mechanical property of the nickel-based high-temperature alloy can be remarkably improved, and the nickel-based high-temperature alloy can have good oxidation resistance and high-temperature corrosion resistance.

A duplex precipitation-strengthened ultra-high strength and toughness stainless steel, wherein the duplex precipitates include NiAl nano-scale precipitates and M2C nano-scale precipitates. M in M2C is mainly Mo element, and also contains metal elements such as Cr and Ni. The NiAl nano-scale precipitates and M2C nano-scale precipitates are both promoted by Co to precipitate and are diffusely distributed in the lath martensite microstructure with a high dislocation density. The ultra-high strength and toughness means that the test results according to national standards GB / T 228.1-2018 and GB / T 21143-2014 are as follows: tensile strength ≥ 1900 MPa, elongation ≥ 10.0%, fracture toughness ≥ 70 MPa·m1 / 2. It is characterized in that it includes the following chemical element components and their wt% contents: C = 0.12 - 0.40%, Cr = 8.0 - 14.0, Ni = 7.0 - 17.0, Mo = 0.80 - 1.60, Al = 0.6 - 3.1, Co = 7.0 - 15.5, W = 0.35 - 0.75, Si ≤ 0.10%, Mn ≤ 0.10%, P ≤ 0.0050%, S ≤ 0.0015%, Fe = the balance.

A tubing and casing resistant to H2S corrosion, and a manufacturing method therefor. In addition to Fe and inevitable impurities, the tubing and casing comprises the following chemical elements in percentage by mass: C: 0.12-0.2%, Si: 0.1-0.5%, Mn: 0.6-0.9%, Cr: 0.3-0.5%, Mo: 1.1-1.5%, V: 0.05-0.1%, Nb: 0.05-0.1%, W: 0.05-0.18%, Al: 0.01-0.05%, Ce: 0.0005-0.0018%, and B: 0.0015-0.005%.

The invention relates to the technical field of optical equipment, in particular to a three-dimensional confocal X-ray emission-fluorescence bimodal spectrometer and a use method. X-ray tube focus point source excitation and three-dimensional confocal light path design are adopted to generate a bimodal signal source, and X-ray emission and X-ray fluorescence bimodal signals of chemical elements in a sample are respectively collected and obtained through a position sensitive detector and an energy sensitive detector through a confocal bent crystal focusing light splitting system and a fluorescence light path; confocal scanning of a three-dimensional space in a sample is completed through a sample loading and position self-control system, and the absolute content of a chemical element in a specific form is calculated through a signal linkage analysis module. The spectrometer can realize synchronous quantitative determination and analysis of forms and contents of chemical elements, solves the problems that XRF and XES can only be operated step by step, form proportion and total data cannot be associated in real time, and an XES spectrogram has spectrum peak overlapping interference and the like, and has one-dimensional point determination, two-dimensional surface scanning and three-dimensional body analysis capabilities.

A high-magnetic-induction oriented silicon steel, comprising, in addition to Fe and inevitable impurities, the following chemical elements in percentage by mass: C≤0.005%, Si: 3.0-3.8%, Als: 0.010-0.035%, Mn: 0.05-0.20%, and at least one of Ce and La which satisfy: Ce+La: 0.003-0.3%, wherein among the inevitable impurity elements, N≤0.005%, S≤0.005%, V≤0.005%, and Ti≤0.005%. Also provided is a manufacturing method for the high-magnetic-induction oriented silicon steel. The annealing temperature of a hot rolled plate can be reduced, annealing of the hot rolled plate can be omitted, the thin-gauge high-magnetic-induction oriented silicon steel can be efficiently produced by means of a cold continuous rolling method, and the magnetic performance of a product is improved while the manufacturing cost is reduced.

The invention belongs to the technical field of chemical element analysis, and particularly relates to a method and device for measuring the content of trace boron in metal calcium. The method comprises the following steps: dissolving a to-be-detected sample to obtain to-be-detected liquid; measuring the intensity of emitted light to be measured of the liquid to be measured under a preset analysis wavelength by using an inductively coupled plasma atomic emission spectrometer; determining the content of the boron element in the to-be-detected sample based on a pre-determined standard curve and the to-be-detected emitted light intensity, the standard curve is obtained by fitting emission light intensity of a plurality of calcium-containing matrix boron standard solutions with different boron element contents under the preset analysis wavelength. According to the embodiment of the invention, the calcium matrix does not need to be separated, the inductively coupled plasma atomic emission spectrometer is directly used for determination, and the use of a toxic reagent methanol is avoided, so that the harm of the methanol reagent to a human body and the pollution to the environment are avoided, and the labor intensity of operators is reduced.

Measurement system and method are presented for determining spatial distribution of chemical elements in a sample. The system comprises a measurement unit and a control system. The measurement unit is adapted to produce primary radiation having spectral characteristic adapted to excite a number M of chemical elements in the sample to induce secondary radiation responses, and generate spectral measured data indicative of intensity of detected responses. The primary radiation interacting with the sample includes a sequence of two or more encoded radiation patterns of the primary radiation, each having its predetermined spatial intensity pattern. The measured spectral data includes a sequence of data pieces, each being modulated by the respective one of the two or more predetermined spatial intensity patterns of the encoded primary radiation and characterized by sparsity in spectral domain with respect to each spectral component of the secondary radiation response.

Disclosed in the present invention is a high-magnetic-induction oriented silicon steel. In addition to Fe and other inevitable impurities, the high-magnetic-induction oriented silicon steel further contains the following chemical elements in percentage by mass: less than or equal to 0.005% of C, 3.0-3.8% of Si, 0.010-0.035% of Als, and 0.05-0.20% of Mn. The other inevitable impurities comprise less than or equal to 0.005% of N, less than or equal to 0.005% of S, less than or equal to 0.005% of V, and less than or equal to 0.005% of Ti. The average size of the secondary grains of the high-magnetic-induction oriented silicon steel is 6-16 mm, and the percentage of the area of the secondary grains having the average deviation angle in the range of 0° to 3° to the area of all the secondary grains is greater than 50%. Correspondingly, the present invention further provides a manufacturing method for the high-magnetic-induction oriented silicon steel.

Disclosed is a steel pipe for oil cylinder and a manufacturing method therefor. In addition to 90 wt % or more of Fe and inevitable impurities, the steel pipe for oil cylinder further comprises the following chemical elements in wt %: C: 0.16-0.3%, Si: 0.15-0.5%, Mn: 1.2-1.8%, Nb: 0.02-0.04%, Mo: 0.1-0.2%, and optionally Ti: 0.015-0.03% and B: 0.0015-0.0035%. According to the present invention, after tension reduction and quenching of the steel pipe, different stepped cooling processes are adopted respectively, the distribution of phase change and thermal stress in the whole wall thickness of the steel pipe for oil cylinder is controlled by increasing the rigidity and straightness level of the steel pipe, the distribution of ferrite in the microstructure of the steel pipe for oil cylinder is controlled, the residual stress of the steel pipe for oil cylinder is effectively reduced, cracking of the inner wall is avoided, and therefore the steel pipe for oil cylinder with high strength and low residual stress is obtained. The steel pipe for oil cylinder has a yield strength of greater than or equal to 600 MPa, a tensile strength of greater than or equal to 730 MPa, and a residual stress of less than or equal to 50 MPa.

The invention discloses a quenching and tempering heat treatment process for round steel 30CrMoA for a sucker rod. The quenching and tempering heat treatment process is characterized in that the quenching temperature is 850-880 DEG C, heat preservation is conducted for 35-45 min, the tempering temperature is 500-600 DEG C, and heat preservation is conducted for 70-90 min; the round steel 30CrMoA for the sucker rod comprises the following chemical components in percentage by weight: 0.30% of C, 0.19% of Si, 0.45% of Mn, 0.89% of Cr, 0.20% of Mo, less than or equal to 0.020% of P, 0.015% of S and the balance of iron and inevitable trace chemical elements. The invention aims to provide the quenched-tempered heat treatment process for the round steel 30CrMoA for the sucker rod, so that the mechanical properties of the round steel 30CrMoA for the sucker rod meet the requirements that the tensile strength is greater than or equal to 1100MPa, the percentage elongation after fracture is greater than or equal to 12%, and the percentage reduction of area is greater than or equal to 50%.

The invention discloses non-oriented silicon steel with excellent comprehensive performance, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: less than or equal to 0.0050% of C, 2.0-4.0% of Si, 0.1-2.0% of Mn, 0.001-2.0% of Al, 0.001-5.0% of Cr, 0.001-5.0% of Ni, 0.001-2.0% of Cu and the balance of Fe. And the mass percentage content of each chemical element also meets the condition that 3 * Si + 0.5 * Al + 0.5 * Mn-5 * Cu-2. 5 * Cr-Ni is greater than or equal to 0 and less than or equal to 13.5%. Correspondingly, the invention further discloses a manufacturing method of the non-oriented silicon steel with the excellent comprehensive performance. By adopting the method, the non-oriented silicon steel plate with excellent comprehensive performance, which integrates heat conduction and electromagnetic performance, can be obtained.

The invention discloses a 900MPa-grade ultra-fine grain steel material, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.20 to 0.28 percent of C, 0.15 to 0.35 percent of Si, 0.90 to 1.40 percent of Mn, 0.80 to 1.30 percent of Cr, 0.30 to 0.65 percent of Mo, 0.86 to 1.25 percent of Ni, 0.01 to 0.08 percent of Nb, 0.015 to 0.05 percent of Al and the balance of Fe and inevitable impurities. In addition, the mass percentage content of each chemical element meets the following conditions: (Mn + Ni) / C is more than or equal to 6 and less than or equal to 12; and 4 < = (Cr + Mo) / C < = 8. Correspondingly, the invention further provides a manufacturing method of the 900 MPa grade ultra-fine grain steel. The yield ratio of the steel is controllable, high strength is guaranteed, and meanwhile good low-temperature toughness and ductility are achieved.

The invention discloses a 20MnCrS5 steel, belonging to the technical field of preparation of large-size gear steel. The invention is composed of the following chemical elements in percentage by weight: C: 0.17% to 0.22%, Si: 0.15% to 0.40%, Mn: 1.10% to 1.30%, P≤0.035%, S: 0.035% to 0.045%, Cr: 1.00% to 1.30%, Alt: 0.020% to 0.060%, and the remainder is iron and inevitable impurities. The invention adopts a die casting process to improve the cooling conditions of the steel ingot, so that the temperature gradient and cooling intensity during the solidification of the ingot are weaker than those of the continuous casting process, thereby avoiding the overlap of the dendrites of the solidified structure, reducing the element segregation, and improving the compactness of the steel.

The invention discloses IF steel with low carbon footprint, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0 < C < = 0.0030%, 0 < Si < = 0.03%, 0.05-0.20% of Mn, 0.06-0.09% of Ti, 0.02-0.06% of Al, 0.005-0.01% of N, and the balance of Fe and inevitable impurities. 0.01 to 0.015 percent of S; b: 0.0002% to 0.0006%; wherein in the inevitable impurities, O is controlled to be less than or equal to 0.0040%. The invention also aims to provide a manufacturing method of the IF steel with the low carbon footprint. The manufacturing method comprises the following steps: carrying out electric furnace smelting, LF (ladle furnace), RH (Ruhrstahl Heraeus) and continuous casting on full scrap steel; hot rolling and coiling; cold rolling; and continuously annealing.