ASTM A724-09(R2018) pdf free download
ASTM A724-09(R2018) pdf free download.Standard Speci fication for Pressure Vessel Plates, Carbon-Manganese-Silicon Steel, Quenched and Tempered, for Welded Pressure Vessels
1. Scope
1.1 This specification covers three grades of carbon- manganese-silicon steel, designated Grades A, B, and C. Grade C may be produced with a boron addition. The plates are quenched and tempered and are intended for welded-layered pressure vessels. 1.2 The maximum thickness of plates supplied under this specification is limited only by the capability of the chemical composition to meet the specified mechanical requirements. However, current practice normally limits the maximum thick- ness to ⁄ 8 in. [22 mm] for Grades A and B, and to 2 in. [50 mm] for Grade C. 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 specifi- cation. 1.4 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. General Requirements and Ordering Information
3.1 Material supplied to this material specification shall conform to Specification A20/A20M. These requirements out- line the testing and retesting methods and procedures, permit- ted variations in dimensions and weight, quality and repair of defects, marking, loading, and ordering information. 3.2 In addition to the basic requirements of this specification, certain supplementary requirements are available when additional control, testing, or examination is required to meet end use requirements. The purchaser is referred to the listed supplementary requirements in this specification and to the detailed requirements in Specification A20/A20M. 3.3 If the requirements of this specification are in conflict with the requirements of Specification A20/A20M, the require- ments of this specification shall prevail.
4. Manufacture
4.1 Steelmaking Process—The steel shall be killed and shall conform to the fine austenitic grain size requirement of Specification A20/A20M.
5. Heat Treatment
5.1 All plates shall be quenched from a temperature in the range from 1600 to 1700°F [870 to 925°C]. Grades A and B shall then be tempered at not less than 1100°F [595°C], and Grade C shall then be tempered at not less than 1150°F [620°C]. The tempering soaking time shall be not less than ⁄ 2 h.
6. Chemical Composition
6.1 The steel shall conform to the requirements as to chemical composition prescribed in Table 1.
7. Mechanical Properties
7.1 Tension Test Requirements: 7.1.1 The material as represented by the tension test speci- mens shall conform to the requirements given in Table 2. 7.1.2 For nominal plate thicknesses of ⁄ 4 in. [20 mm] and under, the 1 ⁄ 2 -in. [40-mm] wide rectangular specimen may be used for the tension test, and the elongation may be determined in a 2-in. [50-mm] gage length that includes the fracture and shows the greatest elongation.
