ASTM A503-15(R2020) pdf free download

ASTM A503-15(R2020) pdf free download.Standard Specification for Ultrasonic Examination of Forged Crankshafts
1. Scope
1.1 This is an acceptance specification for the ultrasonic inspection of forged steel crankshafts having main bearing journals or crankpins 4 in. [100 mm] or larger in diameter. 1.2 This specification covers the testing equipment required and the test procedure to be followed, and it defines the critical and noncritical areas and limits of acceptance. 1.3 This specification is intended to cover both continuous grain flow (CGF) crankshafts for medium and high speed diesel engines as well as solid (slab) forged crankshafts for other applications. 1.4 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standard. Within the text and tables, the SI units are shown in brackets. The values stated in each system are not necessarily exact equiva- lents; 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. 1.5 Unless the order specifies the applicable “M” specifica- tion designation, the inch-pound units shall be used. 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 continuous grain flow crankshafts—produced by a process in which the solidification centerline of the original ingot or starting stock is maintained through the main bearings, webs, crankpins, and flanges ofthe finished crankshaft, usually by means of closed die forging. 3.1.2 solid (slab) forged crankshafts—made from open die forgings such that the grain flow in the webs is essentially parallel to the major axis of the forging and the crankpins are offset from the forging centerline by machining. They may be set in the correct orientation by a hot twisting operation.
4. Ordering Information
4.1 It is necessary that the crankshaft be identified as being either continuous grain flow or solid (slab) forged. 4.2 Unless otherwise specified by means of supplementary ordering information, the test methods and acceptance criteria for the appropriate crankshaft type shall be used.
5. Apparatus and Personnel Requirements
5.1 The apparatus and personnel requirements shall be in accordance with Practice A388/A388M. For standardization purposes, it is recommended that final acceptance be based on the use of 2–5 MHz transducers.
6. Critical Sections
6.1 The division ofa crankshaft into three volumetric zones, as shown in Fig. 1 and Fig. 2, for the purpose of ultrasonic examination evaluation is applicable to both solid (slab) forged and continuous grain flow crankshafts. 6.2 The major critical sections shown as Zone 1 in Fig. 1 include the heavily loaded areas of the crankpins, webs, and main bearings. 6.3 The minor critical sections shown as Zone 2 in Fig. 1 include the balance ofthe surface areas ofthe main bearing and crankpin journals and adjacent fillets, flanges, and gear fit areas. 6.4 The balance of the crankshaft as shown in Fig. 1, including the remaining sections of the webs, is included in Zone 3.