定价： 590元 / 折扣价： 502 元 加购物车

This specification covers three grades, Grades A, B, and C, of carbon-manganese-silicon steel plates intended primarily for service in welded pressure vessels where improved low temperature notch toughness is important. The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements. The steel shall be killed and the plates shall undergo heat treatment. Tensile properties such as tensile strength, yield strength and elongation shall be determined by subjecting the steel plates to a tension test.1.1 This specification2 covers three grades of carbon-manganese-silicon steel plates intended primarily for service in welded pressure vessels where improved low temperature notch toughness is important.1.2 The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements.1.3 For plates produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional test results, of Specification A20/A20M apply.1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

4.1 This test method may be used as a substitute for, or in conjunction with, coring to determine the thickness of slabs, pavements, decks, walls, or other plate structures. There is a certain level of systematic error in the calculated thickness due to the discrete nature of the digital records that are used. The absolute systematic error depends on the plate thickness, the sampling interval, and the sampling period.4.2 Because the wave speed can vary from point-to-point in the structure due to differences in concrete age or batch-to-batch variability, the wave speed is measured (Procedure A) at each point where a thickness determination (Procedure B) is required.4.3 This test method is a pplicable to plate-like structures with lateral dimensions at least six times the thickness. These minimum lateral dimensions are necessary to prevent other modes3 of vibration from interfering with the identification of the thickness mode frequency in the amplitude spectrum. As explained in Note 12, the minimum lateral dimensions and acceptable sampling period are related.4.4 The maximum and minimum thickness that can be measured is limited by the details of the testing apparatus (transducer response characteristics and the specific impactor). The limits shall be specified by manufacturer of the apparatus, and the apparatus shall not be used beyond these limits. If test equipment is assembled by the user, thickness limitations shall be established and documented.4.5 This test method is not applicable to plate structures with overlays, such as a concrete bridge deck with an asphalt or portland cement concrete overlay. The method is based on the assumption that the concrete plate has the same P-wave speed throughout its depth.4.6 Procedure A is performed on concrete that is air dry as high surface moisture content may affect the results.4.7 Procedure B is applicable to a concrete plate resting on a subgrade of soil, gravel, permeable asphalt concrete, or lean portland cement concrete provided there is sufficient difference in acoustic impedance3 between the concrete and subgrade or there are enough air voids at the interface to produce measurable reflections. If these conditions are not satisfied, the waveform will be of low amplitude and the amplitude spectrum will not include a dominant peak at the thickness frequency. If the interface between the concrete and subgrade is rough, the amplitude spectrum will have a rounded peak instead of a sharp peak associated with a flat surface.4.8 The procedures described are not influenced by traffic noise or low frequency structural vibrations set up by normal movement of traffic across a structure.4.9 The procedures are not applicable in the presence of mechanical noise created by equipment impacting (jack hammers, sounding with a hammer, mechanical sweepers, and so forth) on the structure.4.10 Procedure A is not applicable in the presence of high amplitude electrical noise, such as may produced by a generator or some other source, that is transmitted to the data-acquisition system.1.1 This test method covers procedures for determining the thickness of concrete slabs, pavements, bridge decks, walls, or other plate-like structures using the impact-echo method.1.2 The following two procedures are covered in this test method:1.2.1 Procedure A: P-Wave Speed Measurement—This procedure measures the time it takes for the P-wave generated by a short-duration, point impact to travel between two transducers positioned a known distance apart along the surface of a structure. The P-wave speed is calculated by dividing the distance between the two transducers by the travel time.1.2.2 Procedure B: Impact-Echo Test—This procedure measures the frequency at which the P-wave generated by a short-duration, point impact is reflected between the parallel (opposite) surfaces of a plate. The thickness is calculated from this measured frequency and the P-wave speed obtained from Procedure A.1.2.3 Unless specified otherwise, both Procedure A and Procedure B must be performed at each point where a thickness determination is made.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 646元 / 折扣价： 550 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 515元 / 折扣价： 438 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

This specification deals with steel tie plates, low-carbon and high-carbon-hot-worked that are used in railroad tracks. The steel shall be manufactured by either basic-oxygen or electric-furnace processes and may be cast by a continuous process or in ingots. Both Grade 1 and Grade 2 tie plates may be sheared, punched, or slotted either hot or cold but only the latter may be placed into an enclosure to assure proper cooling. One bend test shall be made from each identified heat. The specimens for testing shall be taken from finished tie plates, longitudinally with the direction of rolling. They shall be rectangular in section and shall have two faces as rolled. If high carbon tie plates represented by bend tests fail to meet the requirements specified, they may be annealed not more than twice and be resubmitted for testing.1.1 This specification covers steel tie plates for use in railroad track.1.2 Two grades of tie plates are described: Grade 1, low-carbon, and Grade 2, high-carbon-hot-worked.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

This guide covers standard specification for nickel steel plates, double-normalized and tempered, intended particularly for welded pressure vessels for cryogenic service. The steel shall be killed and shall conform to the fine austenitic grain size requirement. All plates shall undergo heat and product analysis and shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, and nickel. Tensile properties of the steel plate shall meet the specified values for tensile strength, yield strength, and elongation. The material shall undergo mechanical tests such as tension test and impact test.1.1 This specification2 covers double-normalized and tempered 9 % nickel steel plates intended particularly for welded pressure vessels for cryogenic service.1.2 Plates produced under this specification are subject to impact testing at −320 °F [−195 °C] or at such other temperatures as are agreed upon.1.3 The maximum thickness of plates is limited only by the capacity of the material to meet the specific mechanical property requirements.1.4 This material is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual magnetism would be detrimental to subsequent fabrication or service.1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

1.1 This test method provides a basic procedure for evaluating the effective shear resistance of the net section of finished metal connector plates. 1.2 The determination of the tensile properties of metal connector plates is covered in Test Method E489. 1.3 Test Methods D1761 covers the performance of the teeth and nails in the wood members during the use of metal connector plates. 1.4 This test method serves as a basis for determining the comparative performance of different types and sizes of metal connector plates resisting shear forces. 1.5 This test method provides a procedure for quantifying shear strength properties of metal connector plates and is not intended to establish design values for connections fabricated with these plates. 1.6 This test method does not provide for the corrosion testing of metal connector plates exposed to long-term adverse environmental conditions where plate deterioration occurs as a result of exposure. Under such conditions, special provisions shall be introduced for the testing for corrosion resistance. 1.7 In the case of dispute, the inch-pound units, shown in parentheses, shall be governing. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元

This specification covers quenched-and-tempered carbon steel and high-strength low-alloy steel plates of structural quality for welded, riveted, or bolted construction. The plates shall undergo heat treatment by heating to a temperature that produces an austenitic structure. Heat and product analyses shall be performed on the material and shall conform to the required amount of chemical composition in carbon, manganese, phosphorus, sulfur, silicon, vanadium, columbium, nitrogen, and copper. The plates shall withstand tension test and applicable grade shall conform to the specified mechanical properties such as yield strength, tensile strength, and elongation.1.1 This specification covers quenched-and-tempered carbon steel and high-strength low-alloy steel plates of structural quality for welded, riveted, or bolted construction. 1.2 If the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be used. 1.3 Plates under this specification are available in four grades as follows: GradeYield Strength, min, ksi [MPa]Tensile Strength, ksi [MPa] Maximum Thickness, in. [mm] A 50 [345] 70–90 [485–620] 11/2 [40] B 60 [415] 80–100 [550–690] 21/2 [65] C A A 2 [50] D 75 [515] 90–110 [620–760] 3 [75] A Varies with thickness. See Table 1. 1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system is to be used independently of the other.

定价： 0元 / 折扣价： 0 元

This specification covers preformed cranioplasty plates that allow alteration of dimensions to fit a particular skull defect. Cranioplasty plates shall be manufactured from unalloyed titanium, wrought cobalt-20chromium-15tungsten-10nickel alloy, or wrought titanium-6aluminum-4vanadium extra low interstitial alloy with multiple perforations and in various dimensions, with the thickness and shape varying with need. The shape, in particular, may be altered by the neurosurgeon such as to contour it to conform to the normal configuration and symmetry of the skull at various defect sites. Should the plates require metallic sutures or screws as fasteners, they shall be of the same metallic composition as the cranioplasty plates.1.1 This specification covers preformed cranioplasty plates that allow alteration for covering skull defects.

定价： 0元 / 折扣价： 0 元

5.1 The impulse-response method is used to evaluate the condition of concrete slabs, pavements, bridge decks, walls, or other concrete plate structures. The method is also applicable to plate structures with overlays, such as concrete bridge decks with asphalt or portland cement concrete overlays. The impulse-response method is intended for rapid screening of structures to identify potential locations of anomalous conditions that require more detailed investigation.5.2 This practice is not intended for integrity testing of piles. For such applications refer to Test Method D5882.5.3 This practice can be used to locate delaminated or poorly consolidated concrete. It can also be used to locate regions of poor support or voids beneath slabs bearing on ground.5.4 Results are used on a comparative basis for comparing concrete quality or support conditions at one point in the tested structural element with conditions at other points in the same element, or for comparing a structural element with another element of the same geometry. Invasive probing (drilling holes or chipping away concrete) or drilling of cores is used to confirm interpretations of impulse-response results.5.5 Because concrete properties can vary from point to point in the structure due to differences in concrete age, batch-to-batch variability, or placement and consolidation practices, the measured mobility and dynamic stiffness can vary from point to point in a plate element of constant thickness.NOTE 1: The flexural stiffness of a plate is directly proportional to the elastic modulus of the material and directly proportional to the thickness raised to the third power (5). As a result, variations in thickness will have a greater effect on variations in mobility than variations in elastic modulus.5.6 The effective radius of influence of the hammer blow limits the maximum concrete element thickness that can be tested. The apparatus defined in this practice is intended for thicknesses less than 1 m.5.7 For highway applications, results may be influenced by traffic noise or low frequency structural vibrations set up by normal movement of traffic across a structure. The intermittent nature of these noises, however, may allow testing during traffic flow on adjacent portions of the structure. Engineering judgment is required to determine whether the response has been influenced by traffic-induced vibrations.5.8 Heavy loads on suspended slabs may affect test results by altering the frequencies and shapes of different modes of vibration. Debris on the test surface may interfere with obtaining a sharp impact and with measuring the response.5.9 The practice is not applicable in the presence of vibrations created by mechanical equipment (jack hammers, sounding with a hammer, mechanical sweepers, and the like) impacting the structure.5.10 Tests conducted next to or directly over structural elements that stiffen the plate will result in reduced mobility and not be representative of the internal conditions of the plate.5.11 The practice is not applicable in the presence of electrical noise, such as that produced by a generator or other electrical sources, that is captured by the data-acquisition system.1.1 This practice provides the procedure for using the impulse-response method to evaluate rapidly the condition of concrete slabs, pavements, bridge decks, walls, or other plate-like structures.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.1.4 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

定价： 590元 / 折扣价： 502 元 加购物车

This specification covers the standard procedure and acceptance for straight-beam, pulse-echo, ultrasonic examination of rolled fully killed carbon and alloy steel plates. The equipment shall be of the pulse-echo straight beam type. Nondestructive examination of the material shall be conducted in an area free of operations that interfere with proper functioning of the equipment. The test shall be done by one of the following methods: direct contact, immersion, or liquid column coupling. Ultrasonic examination shall be made on either major surface of the plate. Grid scanning shall be continuous along perpendicular grid lines or shall be continuous along parallel paths, transverse to the major plate axis, or shall be continuous along parallel paths, parallel to the major plate axis, or smaller centers. Any discontinuity indication causing a total loss of back reflection which cannot be contained within a circle is unacceptable.1.1 This specification2 covers the procedure and acceptance standards for straight-beam, pulse-echo, ultrasonic examination of rolled fully killed carbon and alloy steel plates, 1/2 in. [12.5 mm] and over in thickness. It was developed to assure delivery of steel plates free of gross internal discontinuities such as pipe, ruptures, or laminations and is to be used whenever the inquiry, contract, order, or specification states that the plates are to be subjected to ultrasonic examination.1.2 Individuals performing examinations in accordance with this specification shall be qualified and certified in accordance with the requirements of the latest edition of ASNT SNT-TC-1A or an equivalent accepted standard. An equivalent standard is one which covers the qualification and certification of ultrasonic nondestructive examination candidates and which is acceptable to the purchaser.1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents, therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

定价： 515元 / 折扣价： 438 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车