ASTM A20:19 pdf download

ASTM A20:2019 pdf download.Standard Specification for General Requirements for Steel Plates for Pressure Vessels.
6.2. 1 If plates are ordered without the heat treatment required by the applicable product specification, heat treatment of the plates to conform to the requirements of the applicable product specification shall be the responsibility of the purchaser.
6.3 If heat treatment is to be performed, the plates shall be heat treated as specified in the applicable product specification. The purchaser may specify the heat treatnieni to be used, provided it is not in conflict with the requirements of the applicable product specification.
6.4 If normalizing is to be performed by the fabricator, the plates shall he either normalized or heated uniformly for hot forming, provided that the temperature to which the plates are heated for hot forming does not significantly exceed the normalizing temperature.
6.5 If no heat treatment is required, the manufacturer or processor shall have the option of heat treating the plates by normalizing, stress relieving, or normalizing and then stress relieving to meet the requirements of the applicable product specification.
6.6 If approved by the purchaser, cooling rates faster than those obtained by cooling in air are permissible to achieve specified mechanical properties, provided that the plates are subsequently tempered in the temperature range from 1100 to 1300°F [595 to 705°C].
7. Chemical Composition
7.1 Heat Analysis:
7.1.1 Sampling for chemical analysis and methods of analysis shall he in accordance with Test Methods, Practices, and Terminology A75 1.
7.1.2 For each heat, the heat analysis shall include determination of the content of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, copper, vanadium, columbium (niobium); any other element that is specified or restricted by the applicable product specification for the applicable grade, class, and type; aluminum, if the aluminum content is to he used in place of austenitic grain size testing of the heat (see 8.3.2.1): and any other austenitic grain refining element for which limits are specified in the purchase order (see 8.3.2).
7.1.3 Heat analyses shall conform to the heat analysis requirements of the applicable product specification for the applicable grade. class, and type. In addition, for elements that are listed in Table 1 but are not specified or restricted in the applicable product specification for the applicable grade, class, and type, heat analyses shall conform to the applicable heat analysis limits given in Table I.
7.2 Product Analysis:
7.2.1 Sampling for chemical analysis and methods of analysis shall be in accordance with Test Methods, Practices, and Terminology A751.