ASME SA-727-SA-727M:2021 pdf free download – SPECIFICATION FOR CARBON STEEL FORGINGS FOR PIPING COMPONENTS WITH INHERENT NOTCH TOUGHNESS
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.
7.1.1.1 The test specimen shall be obtained from a rough or finished production forging, or prolongation thereof, or it may be obtained from separately forged test blanks from the same heat of steel as the production forg- ing. The test blank shall be reduced by forging in a manner similar to that for the products represented, shall receive approximately the same hot working and reduction, be of the same nominal thickness, and receive the same heat treatment as the finished products represented. The test material shall be treated in the same furnace at the same time as the forging itrepresents, subjectto the requirements of 7.1.2.1.
7.1.2.1 If heat treatment is performed in either a continuous or a batch-type furnace controlled within ± 25°F [± 14°C] of the required heat-treatment temperature, and equipped with recording pyrometers so that complete records ofheat treatment are available and ifthe same heat treating cycles are used on the forgings represented by the tension test, then one tension test per nominal wall thick- ness ± 1 ⁄ 4 in. [± 6 mm] from each heat shall be required, instead ofone tension test per nominal wall thickness from each heat in each heat-treatment charge.
15.1 For forgings made to specified dimensions, when agreed to by the purchaser, andforforgings made to dimen- sional standards, application of identification marks as required in Section 16 shall be the certification that the forgings have been furnished in accordance with the requirements of this specification.
15.2 When test reports are required, they shall include certification that all requirements ofthis specification have been met. The reports shall show the results of all required tests, the heatnumberormanufacturer’s heatidentification, a description ofthe heat treatment used, and shall be trace- able to the forging represented. The specification designa- tion included on test reports shall include year ofissue and revision letter, if any.
16.1 Identification marks consisting ofthe specification designation, manufacturer’s name or symbol, (Note 2) the heatnumberormanufacturer’s heatidentification, size, and service rating, ifapplicable, shall be permanently placed on each forging in a position that will not affect the usefulness of the forging. When size does not permit complete mark- ing, identification marks may be omitted in the sequence specified in SP-25, except that the word “steel” shall not be substituted for the specification designation. The speci- fication number marked on the forgings need not include specification year of issue and revision letter.