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ASTM A275/A275M - 23
Standard Practice for Magnetic Particle Examination of Steel Forgings
| Fecha edición: |
2023-11-01
En Vigor
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|---|---|
| Idiomas disponibles: | Inglés |
| Resumen: | This test method covers the procedures for the standard practice of performing magnetic particle examination on steel forgings. The inspection medium shall consist of finely divided ferromagnetic particles, whose size, shape and magnetic properties, both individually and collectively, shall be taken into account. Forgings may be magnetized in the longitudinal or circular direction by employing the surge or continuous current flow methods. Magnetization may be applied by passing current through the piece or by inducing a magnetic field by means of a central conductor, such as a prod or yoke, or by coils. While the material is properly magnetized, the magnetic particles may be applied by either the dry method, wet method, or fluorescent method. The parts shall also be sufficiently demagnetized after inspection so that residual or leakage fields will not interfere with future operations to which the steel forgings shall be used for. Indications to be evaluated are grouped into three broad classes, namely: surface defects, which include laminar defects, forging laps and folds, flakes (thermal ruptures caused by entrapped hydrogen), heat-treating cracks, shrinkage cracks, grinding cracks, and etching or plating cracks; subsurface defects, which include stringers of nonmetallic inclusions, large nonmetallics, cracks in underbeads of welds, and forging bursts; and nonrelevant or false indications, which include magnetic writing, changes in section, edge of weld, and flow lines. |
| Keywords: | circular magnetization; d c magnetization; dry method; fluorescent method; longitudinal magnetization; steel forgings; surface flaw detection; wet method; |
| Scope: | 1.1 This practice2 covers a procedure for magnetic particle examination of steel forgings. The procedure will produce consistent results upon which acceptance standards can be based. This practice does not contain acceptance standards or recommended quality levels. 1.2 Only direct current or rectified alternating (full or half wave) current shall be used as the electric power source for any of the magnetizing methods. Alternating current is not permitted because its capability to detect subsurface discontinuities is very limited and therefore unsuitable. 1.2.1 Portable battery powered electromagnetic yokes are outside the scope of this practice. Note 1: Guide E709 may be utilized for magnetic particle examination in the field for machinery components originally manufactured from steel forgings. 1.3 The minimum requirements for magnetic particle examination shall conform to practice standards of Practice E1444/E1444M. If the requirements of this practice are in conflict with the requirements of Practice E1444/E1444M, the requirements of this practice shall prevail. 1.4 This practice and the applicable material specifications are expressed in both inch-pound units and SI units. However, unless the order specifies the applicable “M” specification designation [SI units], the material shall be furnished to inch-pound units. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
| ICS: | 77.140.85 - Piezas forjadas, 77.040.20 - Ensayos no destructivos de metales |
| CTN: | A01.06 - A01.06 |
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Otras Relaciones |
Es referenciada por A0336_A0336M-23 Es referenciada por A788/A788M - 25a Es referenciada por A0837_A0837M-17R22 Es referenciada por A0729_A0729M-17R22 Es referenciada por A0288-18R23 Es referenciada por A0909_A0909M-06R21 Es referenciada por A0723_A0723M-18AR23 Es referenciada por A0711_A0711M-17R22 Es referenciada por A0469_A0469M-07R22 Es referenciada por A0504_A0504M-18R23 Es referenciada por A0859_A0859M-23 Es referenciada por A0290_A0290M-16R21 Es referenciada por A961/A961M - 25a Es referenciada por A182/A182M - 25 Es referenciada por A471/A471M - 19(2024) Es referenciada por A1021/A1021M - 20(2025) Es referenciada por A765/A765M - 24 Es referenciada por A982/A982M - 10(2025) Es referenciada por A266/A266M - 24 Es referenciada por A966/A966M - 15(2025) |
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