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ASTM A266 / A266M - 21
Standard Specification for Carbon Steel Forgings for Pressure Vessel Components
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Abstract
This specification covers four grades of carbon steel forgings for boiler and pressure vessel components, and associated equipment. Materials shall be manufactured by melting process and hot-worked forging. Heat and product analyses shall be performed wherein forgings shall conform to chemical requirements for carbon, manganese, phosphorus, sulphur, and silicon. Mechanical properties such as tensile strength, yield strength, elongation, and reduction of area shall be inspected as well. The requirements for annealed, normalized, or normalized and tempered steel forgings, and that for quenched and tempered steel forgings have been specified separately.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification2 covers four grades of carbon steel forgings for boilers, pressure vessels, and associated equipment.
Note 1: Designations have been changed as follows:
| Current | Formerly |
| Grade 1 | Class 1 |
| Grade 2 | Class 2 |
| Grade 3 | Class 3 |
| Grade 4 | Class 4 |
1.2 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.4 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A788/A788M Specification for Steel Forgings, General Requirements
A1058 Test Methods for Mechanical Testing of Steel ProductsMetric
E112 Test Methods for Determining Average Grain Size
E165/E165M Practice for Liquid Penetrant Testing for General Industry
E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
Other Standard
ASME Boiler and Pressure Vessel Code, Section IXICS Code
ICS Number Code 77.140.30 (Steels for pressure purposes); 77.140.85 (Iron and steel forgings)
UNSPSC Code
UNSPSC Code 31132100(Steel forgings)
Referencing This Standard
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DOI: 10.1520/A0266_A0266M-21
Citation Format
ASTM A266 / A266M-21, Standard Specification for Carbon Steel Forgings for Pressure Vessel Components, ASTM International, West Conshohocken, PA, 2021, www.astm.org
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