ASME SA-336-SA-336M:2021 pdf free download – Standard Specification for Alloy Steel Forgings for Pressure and High-Temperature Parts
8.1.3, the tension test specimens shall be taken from a location that represents the midwall of the heaviest section of the production forgings. When specimens are required from oppo- site ends, they shall be taken from the diagonal corners of an axial plane. Alternatively, and when specified by the purchaser, the specimens shall be taken in accordance with Supplemen- tary Requirement S3.
8.1.1.2 For liquid quenched and tempered forgings, the test specimens shall have their longitudinal axis at least 1 ⁄ 4 Tof the maximum heat-treated thickness from any surface and with the mid-length of the specimens at least one T from any second surface. where Tis the maximum heat-treated thickness. A thermal buffer may be used to adhere to the above condition.
8.1.1.3 For liquid quenched and tempered forgings with prior purchaser approval, test specimens may be taken at a depth (t) corresponding to the distance from the area of significant stress to the nearest heat-treated surface and at least twice this distance (2 t) from any second surface. However, the test depth shall not be nearer to one heat-treated surface than 3 ⁄ 4 in. [19 mm] and to the second treated surface than 1 1 ⁄ 2 in. [38 mm]. This method of test specimen location normally (known as tx2t testing) applies to thick and complex pressure vessel components where the testing in accordance with 8.1.1.2 is not practical. Sketches showing the proposed exact test locations shall be approved by the purchaser when this method is used.
8.1.2 Except as specified in this specification, tests for acceptance shall be made after heat treatment has been completed in accordance with Section 6. When the ends of the cylindrical forgings are closed in by reforging, the cylindrical forgings may be normalized and tempered or annealed and tested before reforging. After reforging, the entire forging shall be re-heat treated in the same manner and at the same temperature range as employed when the forging was heat treated before certification testing.
8.1.3 When mutually agreed upon between the manufac- turer and the purchaser, test specimens may be machined from a specially forged block suitably worked and heat treated with the production forgings. Such a special block shall be obtained from an ingot, slab, or billet from the same heat used to make the forgings it represents. This block shall receive essentially the same type of hot-working and forging reduction as the production forgings; however,The dimension T shall be representative of the heaviest effective cross section of the forging. For quenched and tempered forgings for which tests are required at both ends by 8.2.2.3 and 8.2.2.4, separately forged test blocks are not allowed. NOTE 1—In using separately forged test blocks, attention is drawn to the effect of mass differences between the production forgings and the test blocks. This can be particularly significant when forgings are either normalized and tempered or quenched and tempered.
8.2.2.4 For quenched and tempered forgings and forged bars weighing more than 10 000 lb [4500 kg] at the time of heat treatment, two tension test specimens shall be taken from each forging. These shall be offset 180° from each other except that if the length of the forging, excluding test prolongations, exceeds 12 ft [3.7 m], then one specimen shall be taken from each end of the forging.