209 results about "Chemical element" patented technology

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.

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 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.

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.

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.

A pharmaceutical composition for isotope-selective modulation including at least one isotope selected from the group consisting of 1H, 6Li, 12C, 10B, 14N, 16O, 17O, 24 Mg, 26 Mg, 28Si, 29Si, 32S, 33S, 39K, 35Cl, 40Ca, 42Ca, 43Ca, 50V, 50Cr, 52Cr, 54Fe, 56Fe, 58Ni, 60Ni, 61Ni, 63Cu, 64Zn, 66Zn, 92Mo, 94Mo, 95Mo, 96Mo, 74Se, 76Se, 77Se, 78Se, 70Ge, 72Ge, 73Ge, 79Br, 85Rb, 107 Ag, 130Ba, 132Ba, 134Ba, 135Ba, and 136Ba, wherein said at least one selected isotope is enriched to exceed its relative isotopic ratio found in a naturally occurring sample of the same chemical element. Methods for its use include investigating the isotopic signatures, intervening with isotopic fractionation in mammals.

An information processing device includes at least one memory and at least one processor. The at least one processor is configured to acquire information about a search target including at least information on a chemical element from another information processing device, repeatedly execute acquisition of a plurality of structures of a substance each containing the chemical element, update of the plurality of structures of the substance, and evaluation of the updated plurality of structures of the substance using a neural network, until a predetermined condition is satisfied, and after the repeated execution, transmit information about a searched structure of a substance and information about an evaluation value of the searched structure of the substance to the other information processing device. The at least one processor executes the acquisition based on the evaluation in the repeated execution.

A high-strength and tough oil tubing resistant to CO2 and H2S corrosion and a manufacturing method therefor. In addition to Fe and unavoidable impurities, the oil tubing further comprises the following chemical elements in wt%: C: 0.08-0.18%, Si: 0.20-0.40%, Mn: 0.30-0.80%, Alt: 0.02-0.04%, Cr: 4.00-10.50%, Ni: 0.50-2.50%, Mo: 0.10-0.40%, and Cu: 0.50-1.50%; and Cr, Cu, and Ni satisfy the following relationship: 6.35% ≤ (Cr + Cu + Ni) ≤ 12.85%, Ni / Cu ≥ 0.55. The described oil tubing has a room temperature yield strength ≥ 580 MPa, and an impact energy at 0°C KV8 ≥ 150 J.

The invention discloses a wire rod for a high-strength and high-toughness sorbite bridge cable, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.70 to 1.10 percent of C, 0.30 to 2.00 percent of Si, 0.30 to 0.90 percent of Mn, 0.30 to 0.90 percent of Cr, 0.01 to 0.30 percent of Mo, 0.01 to 0.30 percent of Ni, 0.01 to 0.50 percent of Cu and 0.01 to 0.20 percent of Al. Wherein the chemical elements also meet the following condition: 1.56 < = [C] + 0.8 [Mn] + [Cr] + 0.7 [Mo] + 1.1 [Ni] + 0.5 [Cu] < = 2.03, wherein [C], [Mn], [Cr], [Mo], [Ni] and [Cu] are respectively substituted into numerical values before the mass percentage of each chemical element.

The invention relates to bearing steel and a manufacturing method thereof. In addition to Fe and other inevitable impurities, the bearing steel disclosed by the invention further comprises the following chemical elements in percentage by mass: 0.75 to 0.85 percent of C, 0.30 to 0.40 percent of Si, 0.30 to 0.40 percent of Mn, 5.00 to 9.00 percent of Cr, 0.15 to 0.25 percent of Mo, less than or equal to 0.25 percent of Cu, less than or equal to 0.015 percent of S, less than or equal to 0.010 percent of P, more than 0 and less than or equal to 0.050 percent of Al, less than or equal to 20ppm of Ti and less than or equal to 10ppm of O. The bearing steel disclosed by the invention has high hardness, excellent wear resistance (fatigue life) and uniform eutectic carbide.

A wire rod for spring steel and a wire made therefrom. The wire rod for spring steel contains, in addition to Fe and inevitable impurities, the following chemical elements in percentage by mass: C: 0.52-0.60%, Si: 1.60-1.80%, Mn: 0.50-0.70%, Cr: 0.60-0.80%, V: 0.05-0.09%, Ce: 0.002-0.005%, Y: 0.006-0.009%, and 0<Al≤0.002%. The wire rod for spring steel has good strength and toughness and good fatigue performance.

Described, herein, relates to a fluorinated electrocatalyst and a method of optimizing a catalytic reaction within an electrochemical cell, in which fluorine atoms may be introduced to the local coordination environment sites to weaken the carbon-nonmetal bonds and drive the nonmetallic chemical elements towards metallic chemical elements. The method may include introducing fluorine atoms to the metal-nonmetal-carbon catalysts to occupy the LCE site within the catalysts in order prevent the nonmetallic chemical elements from occupying the LCE sites, thereby driving the nonmetallic chemical element to form a nonmetallic chemical element layer on a surface of the metallic chemical elements. The nonmetallic chemical element layer may also inhibit the agglomeration and migration of the metallic chemical elements about the LCE site, optimizing catalyst activity through the regulation of the LCE site. The resulting fluorine-doped high-performance catalysts may be usable within electrochemical cells, with long-term stability and reduced degradation.

The invention discloses surface quenched steel, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.50 to 0.57 percent of C, 0.1 to 0.35 percent of Si, 0.7 to 0.9 percent of Mn, 0.1 to 0.3 percent of Cr, 0.02 to 0.15 percent of Mo, 0.02 to 0.04 percent of Al, 0.01 to 0.035 percent of S, 0.005 to 0.015 percent of N, and the balance of Fe and inevitable impurities. And does not contain Ni element. The invention further discloses a manufacturing method of the surface quenched steel. The manufacturing method comprises the following steps: smelting and casting; heating and rolling; forging and forming; surface quenching and low-temperature tempering are carried out, wherein the surface quenching temperature is 830-950 DEG C; and the low-temperature tempering temperature is 160-220 DEG C, and the heat preservation time is 1-3 h.

Provided are a high-strength thin-gauge checkered steel plate / strip comprising the following chemical elements in weight percentages: C: ≤0.06%, Si: ≤0.5%, Mn: 0.4-1.7%, P≤0.04%, S≤0.007%, N: 0.004-0.010%, Als: <0.001%, B: 0.001-0.006%, Mn / S≥250, total oxygen [O]T: 0.007-0.020%; Cu: 0.1-0.6% and / or Sn: 0.005-0.04%; and a balance of Fe and other unavoidable impurities, and a manufacturing method thereof. The resultant steel roll can be used directly as hot-rolled checkered plate / strip, or as a finished checkered plate / strip after being cut and finished, and is widely applicable to the fields of architecture, mechanical production, automobile, bridges, transportation, ship building, etc.

The invention discloses macromolecular high-toughness alloy structural steel, which contains Fe and inevitable impurities, and also contains the following chemical elements in percentage by mass: 0.09-0.16 wt.% of C, 0.09-0.16 wt.% of B, 0.09-0.16 wt.% of C, 0.09-0.16 wt.% of Cr, 0.09- %, 0.50 to 0.90 wt.% of Si; %, Mn: 2.20 to 2.80 wt.%; %, 0.50 to 0.80 wt.% of Cr; wt.% of V: 0.15 to 0.25 wt.%; %, 0.03 to 0.06 wt.% of Nb; %, 0.20 to 0.40 wt.% of Mo; wt.% of W: 0.2 to 0.5 wt.%; wt.% of Ti: 0.02 to 0.04 wt.%; %, 0.015 to 0.025 wt.% of Al; and 0.013 to 0.018 wt.% of N. The invention further discloses a manufacturing method of the steel. The manufacturing method comprises the following steps: smelting; casting is conducted; forging and cogging; and rolling. The material is excellent in toughness, and has good heat resistance and heat stability.

The invention discloses a high-strength Fe-Si soft magnetic material, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 2.85 to 3.3 percent of Si, 0.6 to 1.25 percent of Mn, 0.8 to 1.4 percent of Al, 0.005 to 2.0 percent of Cu, 0.0003 to 0.01 percent of B and 0.0005 to 0.005 percent of C. The invention further discloses a manufacturing method of the high-strength Fe-Si soft magnetic material. The manufacturing method comprises the following steps: smelting and casting; hot rolling; annealing the hot-rolled plate; cold rolling; annealing a finished product: controlling the heating rate within the range of 60 DEG C / s-175 DEG C / s in a heating temperature rise section of 645 DEG C-715 DEG C, controlling the temperature of a soaking section of 720 DEG C-820 DEG C, and keeping the temperature of the soaking section for 20 s-120 s; and coating an insulating coating.

The application provides a geochemical exploration anomaly ore-bearing property evaluation method and device, obtains geochemical exploration information of a target anomaly region to be evaluated in ore-bearing property, obtains reconstruction concentration information of a chemical element at each sampling point according to the geochemical exploration information and a trained physical information neural network model, wherein the trained physical information neural network model comprises a physical simulation layer embedded with a fractional order reaction-diffusion equation; and then the target anomaly region is evaluated in ore-bearing property according to original concentration information and the reconstruction concentration information of the chemical element at each sampling point. The fractional order reaction-diffusion equation describing the ore-forming geochemical process is learned and simulated through the physical information neural network model, so that the reconstruction concentration information is more in line with the ore-forming regularity, and field verification or drilling is performed when the ore-bearing property evaluation grade of the target anomaly region is high, thereby reducing the exploration cost.

The present application relates to a process for separating chemical elements M1, M2 and / or M3 contained in a solid sample, such as end of life batteries or black masses, wherein M1 is an alkali metal, M2 is a transition metal and M3 is aluminum.

Compositions of matter and methods of identifying and making compositions of matter are disclosed. Some embodiments disclose making and chemically and / or compositionally tuning superconducting hydride materials. Some embodiments disclose an apparatus for making and compositionally tuning superconducting materials. Some embodiments disclose a composition of matter including a solid hydride exhibiting superconductivity at a temperature of at least 150 kelvin at an ambient pressure below 180 gigapascals, or at a temperature of at least 261 kelvin. In one or more embodiments, the superconductor includes a covalent metal hydride having at least three different chemical elements wherein an inter-atomic distance between the hydrogen in the covalent metal hydride is in a range of 1.1-2 angstroms. In yet further examples, the superconductor is formed using molecular exchange and compression of a Van der Waals solid. In yet further examples, the superconductor comprises molecular hydrogen disposed in 1-dimensional channels. These and other embodiments are disclosed herein.

The present invention relates to a TiAlBSiN coating deposited on the surface of a substrate (1), wherein the coating (100) comprises three different coating portions along its coating thickness: a first portion (5), a second portion (10), and a third portion (50), the first portion (5) being deposited closer to the surface of the substrate (1) than the second and third portions, the second portion (10) being deposited directly on the outermost surface of the first portion (5), and the third portion (50) being deposited directly on the outermost surface of the second portion (10). The first portion (5) is formed from one or more layers, in either case formed by at least one adhesive layer, the first portion (5) exhibits either a completely cubic crystalline phase or a mixture of crystalline phases including a cubic crystalline phase and a hexagonal wurtzite phase of the crystal, and if it is a mixture of crystalline phases, it mainly exhibits a cubic phase, and at least one adhesive layer contains titanium and nitrogen; and The second portion (10) is formed from one or more layers, in either case formed by at least one support layer, the second portion (10) shows either a completely crystalline hexagonal wurtzite phase or a mixture of crystalline phases including a crystalline cubic phase and a crystalline hexagonal wurtzite phase, and in the case of a mixture of crystalline phases, it shows mainly a wurtzite phase, and the at least one support layer contains titanium, aluminum, nitrogen, and at least one chemical element selected from boron and silicon; and The third portion (50) is formed from one or more layers, in either case being formed from at least one functional layer, the third portion (50) exhibiting either a completely crystalline cubic phase or a mixture of crystalline phases including a crystalline cubic phase and a crystalline hexagonal wurtzite phase, the mixture of crystalline phases exhibiting primarily a cubic phase, and at least one functional layer containing titanium, silicon, and nitrogen.

The invention discloses corrosion-resistant sorbite high-carbon steel, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.70 to 0.90 percent of C, 1.00 to 2.50 percent of Si, 0.30 to 0.90 percent of Mn, 0.30 to 0.90 percent of Cr, 0.01 to 0.30 percent of Ni, 0.01 to 0.30 percent of Al, and the balance of Fe and inevitable impurities. 0.30 wt.% or less of Zn; wherein the chemical elements also meet the following conditions: 0.1 < = 0.06 [Si] + 0.4 [Al] + 0.5 [Zn] < = 0.32. The invention further discloses a steel wire which is prepared from the corrosion-resistant sorbite high-carbon steel at least through drawing and galvanizing procedures. The invention also discloses the corrosion-resistant sorbite high-carbon steel, a steel wire and a manufacturing method thereof.

The invention discloses a thick normalized seamless line pipe, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.18 to 0.21 percent of C, 0.25 to 0.35 percent of Si, 1.32 to 1.50 percent of Mn, 0.02 to 0.035 percent of Alt, 0.13 to 0.25 percent of Cr, 0.08 to 0.10 percent of V, less than or equal to 0.01 percent of Ti, 0.02 to 0.04 percent of Nb and 0.014 to 0.020 percent of N. The invention further discloses a manufacturing method of the thick normalized seamless line pipe. The manufacturing method comprises the steps that a pipe blank is manufactured; the steel pipe is obtained after the pipe blank is subjected to heating, perforating, hollow blank reducing, continuous rolling, reheating, tension reducing and cooling; and normalizing is conducted, specifically, the steel pipe is heated to 900-950 DEG C, heat preservation is conducted for 35-90 min, then the steel pipe is cooled to 400 DEG C or below at the cooling speed Vc of 4-18 DEG C / s, and then air cooling is conducted.

The invention discloses a surface hardening steel with uniformly distributed hardness of a hardening layer, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.34 to 0.42 percent of C, 0.1 to 0.4 percent of Si, 0.7 to 1.4 percent of Mn, 0.02 to 0.25 percent of Cr, 0.02 to 0.15 percent of Mo, 0.015 to 0.05 percent of Al, 0.001 to 0.0035 percent of B, 0.02 to 0.06 percent of Ti, 0.01 to 0.035 percent of S, 0.003 to 0.008 percent of N and the balance of Fe. And no Cu element is contained. The invention further discloses a manufacturing method of the steel. The manufacturing method comprises the following steps: smelting and casting; heating and rolling; normalizing after rolling; surface quenching and low-temperature tempering are carried out, wherein the surface quenching temperature is 830-950 DEG C; and the low-temperature tempering temperature is 150-250 DEG C, and the heat preservation time is 1-3 h.

The present disclosure provides a non-oriented electrical steel with excellent overall performance, which contains, in addition to Fe and inevitable impurities, the following chemical elements by mass percentage: C≦0.0050%, Si: 3.10-4.50%, Al: 0.10%-2.00%, Mn: 0.10%-2.50%, and 3.75%≦Si+Al≦5.22%. Correspondingly, the present disclosure also discloses a method for producing the non-oriented electrical steel. The non-oriented electrical steel has small magnetic anisotropy, high magnetic induction strength, small iron loss at medium and high frequencies, and high yield strength, making it suitable for use as an iron core material in electric vehicle drive motors, high-speed motors, unmanned aerial vehicles, and the like.

This invention relates to the field of electrochemical polishing of cobalt-based alloys, specifically to an environmentally friendly electrochemical polishing solution and polishing method for a cobalt-chromium-tungsten-nickel alloy. The cobalt-based alloy has the following chemical element mass percentages: Cr: 15.0%–25.0%; W: 10.0%–20.0%; Ni: 0.0%–15.0%; the balance being Co and unavoidable impurities such as O, N, and H. The environmentally friendly polishing solution has the following chemical composition and molar percentages: ChCl: 0.5–2 mol / L; ethylene glycol: 0.7–1.0 L; ethanol: 0–0.3 L; glacial acetic acid: 0.1–0.3 L; and a small amount of citric acid as an additive. The electrochemical polishing uses the alloy as the anode and a U-shaped titanium plate as the cathode, with a voltage of 40–60 V and a current density of 0.5–2 A / cm². 2 The polishing temperature is room temperature. The advantage of this invention is that it uses an environmentally friendly electrolyte, which can polish the surface of cobalt-chromium-tungsten-nickel alloy, avoiding the pollution of traditional chromium oxide system and acidic electrolyte system, reducing the need for repeated cleaning processes, and improving the precision control of materials.

Disclosed is a steel which, in addition to comprising Fe and unavoidable impurities, also comprises the following chemical elements by mass percentage: C: 0.135-0.165%, Si: 0.10-0.35%, Mn: 0.60-0.90%, Cr: 0.40-0.70%, Ni: 0.40-0.70%, Mo: 0.15-0.44%, Al: 0.020-0.050%, Nb: 0.002-0.030%, V: 0.002-0.020%, N: 0.004-0.018%. Also disclosed is a method for manufacturing the described steel, comprising the steps: smelting and casting; heating; and forging or rolling, controlling the final forging or final rolling temperature to be ≥900°C.

A pharmaceutical composition for isotope-selective modulation including at least one isotope selected from the group consisting of 1H, 6Li, 12C, 10B, 14N, 16O, 17O, 24Mg, 26Mg, 28Si, 29Si, 32S, 33S, 39K, 35Cl, 40Ca, 42Ca, 43Ca, 50V, 50Cr, 52Cr, 54Fe, 56Fe, 58Ni, 60Ni, 61Ni, 63Cu, 64Zn, 66Zn, 92Mo, 94Mo, 95Mo, 96Mo, 74Se, 76Se, 77Se, 78Se, 70Ge, 72Ge, 73Ge, 79Br, 85Rb, 107Ag, 130Ba, 132Ba, 134Ba, 135Ba, and 136Ba, wherein said at least one selected isotope is enriched to exceed its relative isotopic ratio found in a naturally occurring sample of the same chemical element. Methods for its use include investigating the isotopic signatures, intervening with isotopic fractionation in mammals.

The present invention relates to a steel for pipelines and a method for its production, wherein the steel for pipelines comprises, in addition to iron and unavoidable impurities, the following chemical elements in mass percent: C: 0.015-0.040%, Si: 0.10-0.30%, Mn: 1.18-1.45%, P < 0.008%, S < 0.0010%, Cu: 0.05-0.35%, Ni: 0.05-0.30%, Cr: 0.15-0.30%, Mo: 0.02-0.09%, Nb: 0.025-0.055%, Ti: 0.005-0.020%, Ca: 0.0010-0.0040%, Alt: 0.010-0.040%, 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%, 0 < As ≤ 0.0030% and satisfies: Nb + Ti ≤ 0.07%; Ca / S ≥ 2; Cu + Ni + Cr + Mo ≤ 0.80%; 0 < N + O + H ≤ 0.0070%; 0.7 ≤ (Nb + 27.5 * Ti) / (5C + 27 * N) ≤ 5.0; a coefficient Ks ≤ 0.23 describing hydrogen-induced crack susceptibility, where Ks = 8.0C + 24S - Alt - 2.3Nb + 2.8Ti + 117B + 0.34Ni - 0.30Mo + 24.5N - 0.19.The resulting steel for pipelines can achieve strength classes X60 / X65 and exhibits good cold toughness as well as excellent resistance to HIC and SSC.

1. Name of the designed product: Carbon and sulfur analyzer (CS-216). 2. Use of the designed product: Instrument for analyzing chemical elements. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view 1. 5. Since the bottom view is an uncommon view, the bottom view is omitted.

The present application discloses a low alloy steel, comprising, in addition to Fe and inevitable impurities, the following chemical elements in percentage by mass: C: 0.02-0.1%, Si: 0.1-1.5%, Mn: 0.10-1.8%, Cr: 1.0-5.5%, Ni: 0.3-3.0%, Cu: 0.3-4.8%, Mo: 0.10-2.5%, V: 0.01-0.2%, Al: 0.01-0.1%, REM: 0.1-1.0%. The low alloy steel of the present disclosure has good resistance to carbon dioxide and microbiologically caused corrosion and is suitable for working environments where microbiologically caused corrosion and CO2 corrosion coexist. In addition, the present application discloses a plate and a welded pipe made from the low alloy steel, and methods for manufacturing the plate and welded pipe.