12 results about "Charpy impact test" patented technology

The present invention provides a welded joint having a weld metal obtained by submerged arc welding at a linear energy of 300 kJ / cm or more. A submerged arc welded joint in which the weld metal has a specific composition, a specific yield strength, a specific tensile strength, a specific absorbed energy in a V-notch Charpy impact test at a test temperature of 0°C, and Ceq represented by the following formula (1) is in the range of 0.65 to 1.00, and α represented by the following formula (2) is in the range of 6.0 or less. Ceq = [C] + 0.17[Mn] + 0.04[Si] + 0.025[Ni] + 0.2[Cr] + 0.25[Mo] … (1) α = 30[C] + 0.7[Mn] + [Ni] - ([Si] + 0.5[Cr] + 1.5[Mo]) … (2) Here, [element] in formula (1), formula (2) is the content (mass %) of the element in the above-described weld metal.

A liquid hydrogen tank having a tank in contact with liquid hydrogen, made of steel whose absorbed energy sE, measured by impact tests at a measurement temperature of -196°C or below using a three-sided slit Charpy impact test specimen, satisfies the following formula 1 or formula 2. sE≧19+0.68×ΔT···Formula 1 In Equation 1, the measured temperature is in the range of greater than -253°C and less than or equal to -196°C, and ΔT is the temperature difference between the measured temperature and -253°C. sE≧19...Equation 2 In Equation 2, the measurement temperature is -253°C or lower.

Provided is a liquid hydrogen tank that comprises a tank that comes into contact with liquid hydrogen and is formed from a steel material that has absorption energy sE measured by an impact test at a measurement temperature of -196°C or lower using a three-surface slit Charpy impact test specimen, the absorption energy sE satisfying expression 1 or expression 2:　expression 1: sE≥19+0.68×ΔT, in expression 1, the measurement temperature is within a range from more than −253°C to no more than -196°C, and ΔT is a temperature difference between the measurement temperature and −253°C;　expression 2: sE≥19, in expression 2, the measurement temperature is −253°C or less.

Provided is a fiber-reinforced material obtained from recycled virgin materials, which has sufficient impact resistance. The fiber-reinforced material has quasi-isotropy, and contains fine pieces of a thermoplastic fiber-reinforced resin composite material before disposal, which have a length of greater than 15 mm and less than or equal to 100 mm, as a laminate having at least one fiber-reinforced sheet containing a reinforcing fiber base material and a thermoplastic matrix resin. In a Charpy impact test according to ISO 179-1, the Charpy impact strength of the fiber-reinforced material is 75% or greater of the maximum Charpy impact strength of the thermoplastic fiber-reinforced resin composite material before disposal, which is obtained by the following determination method. The fiber direction of the reinforcing fiber contained in the fiber-reinforced sheet constituting the outermost layer of the thermoplastic fiber-reinforced resin composite material before disposal is defined as 0°, and test pieces are cut out in the 0°, 45°, and 90° directions, respectively. The Charpy impact strength of each test piece is determined according to ISO 179-1. The maximum value among these is defined as the maximum Charpy impact strength.

The application provides a prediction and analysis method for the ductile-brittle transition temperature of high-strength structural steel material, which is determined by conducting Charpy impact tests and dynamic tear tests at a specific temperature, and establishing the ETT of the impact sample ductile-brittle transition temperature and the dynamic tear sample ductile-brittle transition temperature at the specific temperature 50 The correlation analysis establishes the impact ductile-brittle transition temperature and the dynamic tear ductile-brittle transition temperature and the specific temperature T 特定 The impact absorbed energy and the dynamic tear energy correlation model at the specific temperature. The prediction and analysis method for the ductile-brittle transition temperature of the high-strength structural steel material has a clear physical mechanism, greatly reduces the evaluation of the ductile-brittle transition test amount and calculation amount of the high-strength structural steel, is simple to construct, fast to use, and realizes the rapid prediction and evaluation of the impact sample ductile-brittle transition temperature and the dynamic tear sample ductile-brittle transition temperature.

The invention belongs to the technical field of Charpy impact tests, solves the problems of accuracy and consistency of test data caused by personal errors in a multi-test-temperature Charpy impact test in the prior art, and provides a multi-temperature Charpy test automatic impact device and equipment for a metal material. Comprising a sample introduction mechanism, a pretreatment mechanism, an impact testing machine and a transfer mechanism, a target sample is transferred in each link by utilizing the transfer mechanism, and the sample introduction mechanism is provided with a first auxiliary mechanism, a first propelling mechanism and a first buffer part matched with the first propelling mechanism; a target sample needing to be tested in the sample introduction mechanism is moved to a first target area of the sample introduction mechanism by utilizing the first auxiliary mechanism, and then the target sample in the first target area is pushed to the first buffer part by utilizing the first pushing mechanism so as to be taken by the transfer mechanism; manual feeding and discharging are not needed when a target sample is subjected to a Charpy impact test, errors caused by human intervention are reduced, and the test efficiency is improved.

The application belongs to the technical field of mechanical property test, and discloses a Charpy impact test sample processing method, which can obtain the impact test sample meeting the test standard by breaking the fracture groove on the second sample blank on the spot before the impact test, cancels the transfer and witness steps of the second transfer stamp, realizes the simplification of the witness process of the impact test sample processing, can effectively shorten the sample processing period, thereby guaranteeing the welding process evaluation progress and the timely feedback of the detection result of the production welding test plate, and further improving the production efficiency.

The invention is intended to provide a duplex stainless steel and a method for manufacturing the same. A duplex stainless steel pipe is also provided. A duplex stainless steel of the present invention has a specific composition and microstructure containing an austenitic phase and a ferrite phase. The duplex stainless steel satisfies the following contents of C, Si, Mn, Cr, Mo, Ni, N, Cu, and W in formula (1) below, and has a yield strength YS of 655 MPa or more, and an energy absorption vE-10 of 40 J or more as measured by a Charpy impact test at a test temperature of -10°C. 0.55[%C] - 0.056[%Si] + 0.018[%Mn] - 0.020[%Cr] - 0.087[%Mo] + 0.16[%Ni] + 0.28[%N] - 0.506[%Cu] - 0.035[%W] + [%Cu*F] = 0.94 (1).

Provided is a high-strength cladded steel sheet that has excellent ammonia SCC resistance and low-temperature durability and is suited to use in a liquid ammonia transport and storage tank or the like and a production method for the cladded steel sheet.　A cladded steel sheet according to the present invention comprises a parent material that has a prescribed component composition and a cladding material that has a prescribed component composition and is bonded to at least one surface (the surface that is to be an inside surface), the tensile strength of the cladded steel sheet being at least 780 MPa, and the energy absorbed by the parent material and a weld-heat-affected zone under Charpy impact testing at -40°C being at least 47 J.

The present invention relates to the technical field of equipment for impact tests; more specifically, to an instrumented pendulum for Charpy-type impact tests on miniaturized samples. The instrumented pendulum (1) for miniaturized Charpy impact test, according to the present invention, is characterized in that it comprises a main monolithic part, a cleaver (7) housed in an anterior opening of the main monolithic part, and the at least two additional plates (11, 12) removably attached to the respective sides of the main monolithic part of the instrumented pendulum (1). Further, the present invention relates to a Charpy impact machine comprising the instrumented pendulum (1) and an automatic device (6) for releasing the instrumented pendulum (1) at different values of firing angle.

This enables the creation of thick-walled cast steel products that achieve both hardness and toughness. [Solution] The cast steel product contains, by mass%, C: 0.27% to 0.37%, Si: 0.20% to 0.80%, Mn: 0.60% to 1.10%, P: greater than 0.0% and less than 0.04%, S: greater than 0.0% and less than 0.04%, Ni: 1.2% to 2.0%, Cr: 1.5% to 2.0%, Mo: 0.0% to 0.2%, and Al: 0.0% to 0.1%, with the remainder being Fe and unavoidable impurities, and has a wall thickness of 1 inch or more, and the impact value in the Charpy impact test measured in accordance with JIS Z 2242 is 20 J / cm². 2 That's all.

This invention provides a method for manufacturing a welded joint with excellent toughness and a welded joint. The manufacturing method of this invention is a method for manufacturing a welded joint (1) having steel (4) and multiple layers of weld metal (31) having a specific chemical composition. The manufacturing method includes the following steps: a multi-layer surfacing process in which the average layer height of each layer in the weld metal (31) between a depth of 5 mm from one surface of the steel and a depth of 5 mm from another surface of the steel, excluding the first layer, is greater than 0 mm and less than 4.0 mm, and welding is performed with a specific welding line energy; and a heat treatment process in which heat treatment is performed at a temperature of 580°C to 620°C for more than 2 hours. The welded joint (1) of the present invention comprises steel (4) and a multilayer weld metal (31) having the above-mentioned specific chemical composition, wherein the average layer height of each layer in the weld metal (31) is greater than 0 mm and less than 4.0 mm, the average width of each layer is more than 15 mm, and the absorbed energy in the Charpy impact test at -40°C of the welded joint is more than 30 J.