استاندارد ASTM A20

در خصوص الزامات عمومی ورق های فولادی در ساخت ظروف تحت فشار

به زبان انگلیسی

33 صفحه

Standard Specification for
General Requirements for Steel Plates for Pressure Vessels

Scope

1.1.1 This general requirements specification also covers a
group of supplementary requirements that are applicable to
several of the 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 of steel and intended
use or service will be utilized.

1.7 In case of any conflict in requirements, the requirements
of the applicable product specification prevail over those of this
general requirements specification.
1.8 Additional requirements that are specified in the purchase 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
E 29.
1.10 The values stated in either inch-pound units or SI units
are to be regarded 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.
1.11 This general requirements specification and the applicable 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.

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