ASME SA-727-SA-727M:2021 pdf download

ASME SA-727-SA-727M:2021 pdf download.SPECIFICATION FOR CARBON STEEL FORGINGS FOR PIPING COMPONENTS WITH INHERENT NOTCH TOUGHNESS
1. Scope
1.1 This specification covers forged carbon steel piping components intended primarily for service in pressure pip- ing systems from −20 to +650 °F [−30 to +345 °C] where inherentnotch toughness is desired, butwhere notch tough- ness testing is not required. Included are forged or ring- rolled flanges, forged fittings, and valves made to specified dimensions, orto dimensional standards such as the ASME and API specifications referenced in Section 2. 1.2 This specification is limited to forgings with maxi- mum finished section thicknesses no larger than 2 in. [51 mm]. 1.3 It shall be the responsibility of the purchaser to determine whether material meeting the requirements of this specification is satisfactory for the service application. 1.4 Supplementary requirements are provided for use when additional testing orinspection is desired. These shall apply only when specified by the purchaser in the order. NOTE 1 —There are no provisions forimpacttesting in this specification. When impact testing is required, refer to Specification A 350/A 350M. 1.5 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units. 1.6 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 systemmustbeusedindependentlyoftheother. Combining values fromthe two systems may resultin nonconformance with the specification.
3. General Requirements and Ordering Information
3.1 Productfurnishedto this specificationshallconform to the requirements of Specification A 961 /A 961M, including any supplementary requirements that are indi- cated in the purchase order. Failure to comply with the requirements of Specification A 961 /A 961M constitutes nonconformance with this specification. In case of a con- flict between the requirements of this specification and Specification A 961 /A 961M, this specification shall prevail. 3.2 It is the purchaser’s responsibility to specify in the purchase order all ordering information necessary to purchase the needed material. Examples of such informa- tion include but are not limited to the following: 3.2.1 Additional requirements (see 15.1 and 15.2).
4. Materials and Manufacture
4.1 The steel shall be made by one or more of the following processes: open-hearth, basic-oxygen, or elec- tric-furnace, and shall be fully killed, fine-grain practice. 4.2 Forgings shall be manufactured from ingots, blooms, billets, slabs, or bars. These items shall be forged, rolled, or strandcast. 4.3 A sufficient discard shall be made from the ingot to secure freedom from injurious piping and undue segre- gation. 4.4 The finishedproductshall be aforging as definedby the Terminology section of Specification A 788/A 788M.
5. Heat Treatment
5.1 Following plastic working, the forging manufac- turer shall heat treat the forgings by normalizing, or nor- malizing and tempering, or quenching and tempering. 5.1.1 Normalizing — The procedure for normalizing shallconsistofuniformly heating the forgings to atempera- ture between 1550 and 1700°F [845 and 925°C], holding a sufficient time to attain uniform temperature throughout, and cooling in still air. The forging shall be atatemperature below 1000°F [540°C] before heating for normalizing. 5.1.2 Quenching — The procedure for quenching shall consist ofuniformly heating the forging to a tempera- ture between 1550 and 1700°F [845 and 925°C], holding a sufficient time to attain uniform temperature throughout, and quenching into a suitable liquid medium. The forging shall be at a temperature below 1000°F [540°C] before heating for quenching. 5.1.3 Tempering —Theprocedurefortemperingshall consist of reheating the forging subsequent to normalizing or quenching to a temperature of at least 1100°F [595°C], but not above the lower transformation temperature, for 30 min/in. [30 min/25 mm] ofmaximum section thickness, with minimum holding time at tempering temperature not less than 30 min.