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ASTM A20-2019 pdf free download

ASTM A20-2019 pdf free download.Standard Specification for General Requirements for Steel Plates for Pressure Vessels
1. Scope
1.1 This general requirements specification 2 covers a group ofcommon requirements that, unless otherwise specified in the applicable product specification, apply to rolled steel plates for pressure vessels covered by each of the following product specifications issued by ASTM:1.1.1 This general requirements specification also covers a group of supplementary requirements that are applicable to several ofthe above product specifications as indicated therein. Such requirements are provided for use if additional testing or additional restrictions are required by the purchaser, and apply only if specified individually in the purchase order. 1.2 Appendix X1 provides information on coil as a source of plates for pressure vessels. 1.3 Appendix X2 provides information on the variability of tensile properties in plates for pressure vessels. 1.4 Appendix X3 provides information on the variability of Charpy-V-Notch impact test properties in plates for pressure vessels.1.5 Appendix X4 provides information on cold bending of plates, including suggested minimum inside radii for cold bending. 1.6 These materials are intended to be suitable for fusion welding. When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade ofsteel and intended use or service will be utilized. 1.7 In case of any conflict in requirements, the requirements ofthe applicable product specification prevail over those ofthis general requirements specification. 1.8 Additional requirements that are specified in the pur- chase order and accepted by the supplier are permitted, provided that such requirements do not negate any of the requirements of this general requirements specification or the applicable product specification. 1.9 For purposes of determining conformance with this general requirements specification and the applicable product specification, values are to be rounded to the nearest unit in the right-hand place of figures used in expressing the limiting values in accordance with the rounding method of Practice E29. 1.10 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.11 This general requirements specification and the appli- cable product specification are expressed in both inch-pound units and SI units; unless the order specifies the applicable “M” specification designation (SI units), the plates are to be furnished to inch-pound units.1.12 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 as-rolled—for plates, the condition of a plate that has been hot-rolled and will not be or has not yet been heat treated. Discussion—The term as-rolled by itself is not meant to refer to plates that have been hot-rolled using control- rolling (CR), direct quench (DQT), thermo-mechanical control rolling (TMCP), recrystalization control rolling (RCR), or any similar methods that are intended to produce a set of properties that are not normally achievable were they not employed. The term as-rolled is to be distinguished from the established term plate-as-rolled that does not define the actual condition of a plate, but defines the singular product ofa slab or ingot that has been hot-rolled 3.1.2 coil—hot-rolled steel in coil form for processing into finished plates. 3.1.3 exclusive—when used in relation to ranges, as for ranges of thicknesses in the tables of permissible variations in dimensions, the term is intended to exclude only the greater value of the range. Thus, a range from 60 to 72 in. [1500 to 1800 mm] exclusive includes 60 in. [1500 mm], but does not include 72 in. [1800 mm]. 3.1.4 heat treatment terms—see 3.1.10, and Terminology A941. 3.1.5 hot forming—a forming operation producing perma- nent deformation, performed after the plate has been heated to the temperature required to produce grain refinement. 3.1.6 hot-rolled (hot rolling)—for plates, the process de- scribed for a plate that has been rolled from a slab or ingot whose starting temperature is suitably above the recrystalliza- tion temperature of the metal to be rolled. Discussion—Hot-rolled may be used in conjunction with any rolling process to more effectively describe a specific condition, for example; hot-rolled as-rolled; hot-rolled control- rolled, etc.

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