126results about How to "Improve hydrogen embrittlement resistance" patented technology

The present invention provides a method of hot pressing using hot rolled and cold rolled steel sheet or Al-based plated steel sheet or Zn-based plated steel sheet enabling a strength of at least 1200 MPa to be obtained after high temperature forming and with extremely little possibility of hydrogen embrittlement and such hot pressed parts, that is, a method of hot pressing a high strength automobile parts comprising using steel sheet containing as steel compositions by wt % C:0.05 to 0.5% or steel sheet plated mainly with Al or Zn to produce automobile members by hot pressing during which making the heating temperature before pressing Ac₃ or more to 1100° C. or less, making the hydrogen concentration in the heating atmosphere 6 vol % or less, and making the dew point 10° C. or less and such hot pressed parts.

The invention discloses an experimental system used for simulating severe accident conditions of the containment of a nuclear power plant and an implementation method thereof to overcome the problem that comprehensive simulation of severe accident conditions of the containment of a nuclear power plant cannot be realized in the prior art. The experimental system comprises an experimental container, a first pressure sensor arranged in the experimental container, a data acquisition system, an exhaust pipeline, an air supply system, a hydrogen supply system, a spray system, an aerosol supply system, a cable combustion product supply system, a water vapor on-line supply system and at least four sampling pipelines, wherein the data acquisition system is connected with the experimental container through multipoint thermocouples; the exhaust pipeline, the air supply system, the hydrogen supply system, the spray system, the aerosol supply system, the cable combustion product supply system, the water vapor on-line supply system and the at least four sampling pipelines are connected with the experimental container; and the aerosol supply system is connected with the spray system. The experimental system provided by the invention has a reasonable structure, can authentically and comprehensively simulate severe accident conditions in the nuclear power plant and carries out hydrogen elimination performance testing on a passive hydrogen recombiner on the basis of simulation results; moreover, testing results approximately represent actual working conditions, so good reference standards are provided for researching and designing of the recombiner.

Disclosed is a high strength steel sheet having excellent hydrogen embrittlement resistance. The steel sheet has a tensile strength of 1180 MPa or more, and satisfies the following conditions: with respect to an entire metallographic structure thereof, bainite, bainitic ferrite and tempered martensite account for 85 area % or more in total; retained austenite accounts for 1 area % or more; and fresh martensite accounts for 5 area % or less (including 0 area %).

A high-entropy alloy having ultra-high strength and high hydrogen embrittlement resistance due to formation of a microstructure at a low strain may be produced without a severe plastic deformation.

A method for producing the high-entropy alloy includes (a) annealing and homogenizing an initial alloy material at 1000 to 1200° C. for 1 to 24 hours; and (b) rolling the annealed and homogenized initial alloy material into a rod, at a cryogenic temperature of −100 to −200° C. while pressing the initial alloy material in multi-axial directions at a strain of 0.4 to 1.2, thereby to produce the high-entropy alloy having intersecting twins as a microstructure, and secondary fine twins formed in the intersecting twins, wherein the initial alloy material contains Co of 5 to 35%, Cr of 5 to 35%, Fe of 5 to 35%, Mn of 5 to 35%, and Ni of 5 to 35%, based on weight %.

The invention discloses a comprehensive performance testing device for an oxyhydrogen composite catalyst and an application method thereof. The comprehensive performance testing device comprises a reaction tank, a test tooling, a measuring system, a data acquisition system, a multipath gas introduction control system and auxiliary testing equipment, wherein the test tooling is mounted in the reaction tank and is used for placing a catalytic board; the measuring system is mounted on the reaction tank and is used for detecting the concentration, the temperature, the pressure and other parameters of gas in the reaction tank; the data acquisition system is connected with the measuring system; the multipath gas introduction control system provides exogenous gas required by the test; the auxiliary testing equipment is connected with the reaction tank. According to the comprehensive performance testing device disclosed by the invention, the design is ingenious; the complex environment of a nuclear power station under the working condition of serious accidents is simulated by an oxyhydrogen composite catalytic board through special equipment, so that environment parameters of the catalyst can be adjusted at any time; all required data is accurately detected by the measuring system and various performance tests of the catalyst are realized; the transfer and the assembly of the catalytic board are eliminated, so that great human and material resources are saved; the time and the labor are saved; the comprehensive performance testing device is convenient and safe in use, simple and quick in debugging and comprehensive and sufficient in detection, and has high popularization and application values in the field.

Disclosed is a weld metal which is formed by gas-shielded arc welding using a flux-cored wire, and which has a specific chemical composition, in which retained austenite particles are present in a number density of 2500 per square millimeter or more and in a total volume fraction of 4.0% or more based on the total volume of entire structures of the weld metal. The weld metal has excellent hydrogen embrittlement resistance and is resistant to cracking at low temperatures even when the weld metal has a high strength.

A predetermined composition is had, when a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite and bainite. Further, in a region to a depth of 1.0 mm from a surface, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction and a lamellar direction on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite.

The invention relates to an anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for a fastener, and a manufacturing method thereof, belongs to the technical field of metal materials, and solves the problem of low matching degree of anti-hydrogen embrittlement property and high toughness of a fastener used in an aerospace environment. The anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for the fastener comprises the following elements in mass fraction: 0.0001%-0.01% of C, 0%-0.10% of Si, 0.01%-0.15% of Mn, 0%-0.005% of S, 0%-0.015%of P, 10.50%-12.50% of Cr, 10.70%-11.50% of Ni, 0.75%-1.25% of Mo, 1.20%-1.70% of Ti, 0%-0.10% of Al, not greater than 1.5ppm of H, and the balance iron and inevitable impurities. The stainless steelbar meeting the comprehensive performance of high strength, high toughness and anti-hydrogen embrittlement property simultaneously is prepared, and the use requirement of the fastener making contactwith a corrosive medium and used for the aerospace environment is met.

The invention provides a Nb based hydrogen permeation alloy doped with special elements and a preparation method thereof, the chemical general formula of the Nb based hydrogen permeation alloy doped with special elements is Nb100-(x + y + Z) MxNyPz; M is one or more than one element selected from Ti, Zr and Hf, N is one or more than one element selected from Ni or Co, P is one or more than one element selected from Cr, Fe, Cu, Al, Mo, Ru, Rh, W, Si, Mn, Sn, Zn and Mg, 20=<x=<30, 10=<y=<30, 5=<z=<20, and x, y and z are mole percentage. The preparation method comprises the following steps: cutting raw materials, cleaning raw material surface, calculating raw material composition, weighing the raw materials, and performing electric arc melting to obtain an alloy ingot. A hydrogen permeation alloy film material which has better hydrogen permeability and properties against hydrogen embrittlement and is doped with various rare earth elements can be prepared by a vacuum electric arc melting method.

Disclosed is a spring steel, containing: C: 0.35-0.65% (the term “%” herein means “mass %”, the same is true hereinbelow), Si: 1.5-2.5%, Mn: 0.05-1%, Cr: 0.05-1.9%, P: 0.015% or less (exclusive of 0%), S: 0.015% or less (exclusive of 0%), Ti: 0.025-0.1%, Al: 0.05% or less (exclusive of 0%), and N: 0.01% or less (exclusive of 0%), wherein an amount of Ti nitride, an amount of Ti sulfide, and an amount of Ti carbide satisfy the following formulas (1), (2), and (3);

[Ti_{with N}]≧3.42×[N]−0.354×[Al]−0.103×[Nb]  (1)

[Ti_{with S}]≧1.49×[S]  (2)

[Ti_{with C}]≧0.015   (3),

in which [Ti_{with N}] represents the amount of Ti (mass %) forming Ti nitride, [Ti_{with S}] represents the amount of Ti (mass %) forming Ti sulfide, [Ti_{with C}9 represents the amount of Ti (mass %) forming Ti carbide, and [N], [Al], [Nb], and [S] represent an amount (mass%) of each element in the steel. The spring steel of the present invention shows excellent resistance to hydrogen embrittlement.

The present invention provides a high strength bolt that has excellent hydrogen embrittlement resistance. The high strength bolt having excellent hydrogen embrittlement resistance which bolt comprises 0.20 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, higher than 0% and not higher than 1.5% of Al, 0.15% or less P, 0.02% or less S, and balance of iron and inevitable impurities, and the structure includes: 1% or more residual austenite; 80% or more in total content of bainitic ferrite and martensite; and 10% or less (may be 0%) in total content of ferrite and pearlite in the proportion of area to the entire structure, and also the mean axis ratio (major axis/minor axis) of the residual austenite grains is 5 or higher and the bolt has tensile strength of 1180 MPa or higher.

The invention discloses a high vacuum-high pressure combined hydrogen storage property testing device for a low hydrogen absorption equilibrium pressure material. The device comprises a high pressure gas introduction system, a high vacuum gas reaction and hydrogen storage sample real-time observation system, a measurement system, a data acquisition system and an auxiliary testing device. The device disclosed by the invention has the advantages that the design is smart; the device can be used for acquiring kinetic data and thermodynamic data of a gas-solid reaction of a hydrogen storage material, especially the low hydrogen absorption equilibrium pressure material, in hydrogen absorption and desorption processes, and further observing the change of the sample surface appearance in situ in the reaction process at the same time, therefore the hydrogen storage properties of these materials are overall obtained, and the research demands on the fields of fusion energy and hydrogen energy are met.

The invention relates to the field of precipitation strengthening austenite alloy, in particular to high-strength hydrogen-brittleness-resistant austenite alloy with the mark of J75 and a preparation method of the high-strength hydrogen-brittleness-resistant austenite alloy. The high-strength hydrogen-brittleness-resistant austenite alloy comprises, by weight, 0.0008-0.0025% of B, smaller than or equal to 0.020% of C, smaller than or equal to 0.006% of S, smaller than or equal to 0.006% of P, 0.10-0.30% of Si, 29.00-32.00% of Ni, 13.50-16.50% of Cr, 1.00-1.60% of Mo, 0.15-0.35% of V, 1.80-2.40% of Ti, 0.10-0.40% of Al, and the balance Fe. The alloy is formed by forging and/or rolling through vacuum induction and vacuum arc self-consuming smelting, hot-rolled bars with the diameters not larger than 80 mm is not lower than level 6, and hot-rolled bars and forged materials with the diameters larger than 80 mm are not lower than the level 5. The inspection result of bars with the diameters not larger than 65 mm needs to conform to the AA-level specification in GB/T 4162, and the inspection result of bars with the diameters larger than 65 mm needs to conform to the A-level specification in GB/T 4162.

A wire rod having a tensile strength of 950 to 1600 MPa for manufacturing a steel wire for a pearlite structure bolt according to the present invention includes a predetermined chemical composition and is manufactured by hot rolling and then direct isothermal transformation treating, in which when an amount of C in terms of mass % is indicated as <C>, a structure at an area from a surface of the wire rod to a depth of 4.5 mm includes 140×<C> area % or more of a pearlite structure, the average block size of a pearlite block at the area from the surface of the wire rod to the depth of 4.5 mm is 20 μm or less, in which the average block size is measured in a transverse section of the wire rod, and the average lamellar spacing of the pearlite structure at the area from the surface of the wire rod to the depth of 4.5 mm is more than 120 nm to 200 nm.

A steel is used for providing a bolt that has a high strength and still exhibits excellent hydrogen embrittlement resistance. The steel contains C of 0.30% to 0.50%, Si of 1.0% to 2.5%, Mn of 0.1% to 1.5%, P of greater than 0% to 0.015%, S of greater than 0% to 0.015%, Cr of 0.15% to 2.4%, Al of 0.010% to 0.10%, N of 0.001% to 0.10%, Cu of 0.1% to 0.50%, Ni of 0.1% to 1.0%, Ti of 0.05% to 0.2%, and V of 0% to 0.2%, with the remainder including iron and inevitable impurities, in which a ratio [Ni]/[Cu] is 0.5 or more, and a total content [Ti]+[V] is 0.085% to 0.30%.

The rolled rod for cold-forged thermally refined articles according to the present invention has a chemical composition consisting, in mass %: C: 0.22 to 0.40%, Si: 0.35 to 1.5%, Mn: 0.20 to 0.40%, P: less than 0.020%, S: less than 0.015%, Cr: 0.70 to 1.45%, Al: 0.005 to 0.060%, Ti: 0.01 to 0.05%, B: 0.0003 to 0.0040%, N: 0.0020 to 0.0080%, and O: 0.0020% or less, with the balance being Fe and impurities, and that satisfies Formula (1) and Formula (2), wherein a total area fraction of pro-eutectoid ferrite and pearlite is 90% or more, an area fraction of the pro-eutectoid ferrite is 30% or more, and the rolled rod has a tensile strength of 700 MPa or less.

0.50≤C+Si/10+Mn/5+5Cr/22≤0.85  (1)

Si/Mn>1.0  (2)

The invention discloses a test device for detecting comprehensive performance of a denitration catalyst. The test device comprises a multi-path gas introduction device, a mixer, a heater, a reaction container, a measuring system, a data acquisition system, a control system and a reaction assisting reactor. The multi-path gas introduction device is used for mixing various gases introduced into the mixer. The heater is used for heating the gases mixed in the mixer. A heating device and a catalysis plate are arranged in the reaction container, and used for making the heated mixed gases react in the reaction container. The measuring system is used for detecting gas concentration, temperature and pressure data before and after the mixed gases are reacted. The data acquisition system is used for receiving and analyzing data transmitted by the measuring system. The control system is used for controlling work of the measuring system. The reaction assisting device is used for assisting implementation of reaction of the mixed gases. By means of the test device, components of the mixed gases can be conveniently controlled, various environment parameters of the catalyst are adjusted, and accordingly comprehensive performance testing of the denitration catalyst is achieved.