More A Other steel grades may also be treated under this specification. Alloy steels shall be melted, forged, and rough machined at stipulated conditions. Except as permitted for Grade F22V, steel forgings shall be annealed or normalized and tempered, but may alternatively be liquid quenched and tempered as well.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. The chemical, tensile, heat treatment, and marking requirements of Speci?
On product analysis they may deviate from these limits to the extent permitted in Table 1 of this speci? These shall apply only when speci? The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Combining values from the two systems may result in non-conformance with the standard. Referenced Documents 2. Current edition approved Feb. Published March Originally approved in Ordering Information and General Requirements 3. Melting and Forging 4. Machining 5. Heat Treatment 6. For all grades, normalizing or liquid quenching shall be followed by tempering at a subcritical temperature as shown in 6. F [? C] minimum.
The tempering temperature range shall be as shown in 6. The product analysis for columbium and calcium for Grade F22V shall conform to the requirements of Table 2 of this speci? Boron is not subject to product analysis. The purchaser may also make this determination in accordance with Speci? Mechanical Properties 8. The largest obtainable tension test specimen as speci? For upset disk forgings, the longitudinal axis of the test specimen shall be in the tangential direction.
For hollow forgings, the longitudinal axis of the specimens shall be located midway between the center and outer surfaces of the wall. When separately forged test blocks are employed, as de?
When specimens are required from opposite ends, they shall be taken from the diagonal corners of an axial plane. Alternatively, and when speci?
This is normally referred to as 1? A thermal buffer may be used to adhere to the above condition. However, the test depth shall not be nearer to one heat-treated surface than 3? 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.
Sketches showing the proposed exact test locations shall be approved by the purchaser when this method is used. Chemical Composition 7. Grade F 91 0. Grade F 0. F3VCb 0. F22V 0. B Applies to both heat and product analyses. In that case the total amount of REM shall be determined and reported.
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 certi? Such a special block shall be obtained 4 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, a longitudinally forged bar with dimensions not less than T 3 T 3 3T may be used to represent a ring forging.
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. This can be particularly signi? The length and weight to be used for this purpose shall be the shipped length and weight of forgings produced individually or the aggregate shipped length and weight of all pieces cut from a multiple forging. When heat treatment is performed in continuous type furnaces with suitable temperature controls and equipped with recording pyrometers so that complete heat treatment records are available, a tempering charge may be considered as any continuous run not exceeding an 8-h period.
The usage of subsize specimens due to material limitations must have prior purchaser approval. One set of three Charpy V-notch specimens shall be taken from each tensile specimen location.
The axis of the notch shall be normal to the nearest heat treated surface of the forging. F [—73? Workmanship, Finish, and Appearance 9. Repair Welding Marking Test Reports Keywords Details of these supplementary requirements shall be agreed upon between the manufacturer and the purchaser. Rough Turning and Boring S1.
Transverse Mechanical Testing S2. The tension test results shall conform with requirements of Table 1, with the exception of the ductility limits which shall be as prescribed in Table S2. When required, the Charpy impact test results shall conform to 8. Alternative Test Specimen Requirements S3.
Hydrostatic Test S4. The details of the test, including its position in the sequence of manufacturing operations, shall be speci? Liquid Penetrant Examination S6. Marking S7. Forging Requirements S8. The walls of the hollowed or hollow ingots shall be reduced in thickness at least one-half by forging on mandrels.
The cross-sectional area of the solid forgings shall have a reduction by forging from that of the ingot in the ratio of not less than The length of block before upsetting shall be at least twice the thickness of the as-forged head or cover. Individual Forging S9. They shall not be forged in multiple and separated prior to or after heat treatment.
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ASTM A336 Grade F6NM Annealed or Normalized and Tempered