tailieunhanh - Standard Specification for Pressure Vessel Plates, Carbon-Manganese-Silicon Steel, Quenched and Tempered, for Welded Pressure Vessels

This specification covers three grades of carbonmanganese-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. | Designation A724 A724M 09 Reapproved 2013 Standard Specification for Pressure Vessel Plates Carbon-Manganese-Silicon Steel Quenched and Tempered for Welded Pressure Vessels1 This standard is issued under the fixed designation A724 A724M the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. 1. Scope In addition to the basic requirements of this 2 This specification covers three grades of carbon- specification certain supplementary requirements are available manganese-silicon steel designated Grades A B and C. Grade when additional control testing or examination is required to C may be produced with a boron addition. The plates are meet end use requirements. The purchaser is referred to the quenched and tempered and are intended for welded-layered listed supplementary requirements in this specification and to pressure vessels. the detailed requirements in Specification A20 A20M. The maximum thickness of plates supplied under this If the requirements of this specification are in conflict specification is limited only by the capability of the chemical with the requirements of Specification A20 A20M the require- composition to meet the specified mechanical requirements. ments of this specification shall prevail. However current practice normally limits the maximum thick- ness to 7 8 in. 22 mm for Grades A and B and to 2 in. 50 mm 4. Manufacture for Grade C. Steelmaking Process The steel shall be killed and shall The values stated in either inch-pound units or SI units conform to the fine austenitic grain size requirement of are to be regarded separately as standard. Within the text the Specification A20 A20M. SI units are shown in brackets. The values stated in each system are not exact equivalents therefore each system