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This test method deals with the acceptance specifications for the ultrasonic examination of forged steel crankshafts. This practice is applicable to both solid (slab) forged and continuous grain flow crankshafts. Specimens shall be divided into three volumetric zones, namely: the major critical sections (Zone 1), which includes the heavily loaded areas of the crankpins, webs, and main bearings; the minor critical sections (Zone 2), which includes the balance of the surface areas of the main bearing and crankpin journals and adjacent fillets, flanges, and gear fit areas; and Zone 3, which includes the balance of the crankshaft, and the remaining sections of the webs. The crankshafts shall be examined after heat treatment, but before machining geometric features such as chamfers and oil holes. Acceptance zones and criteria for both types of crankshafts are discussed briefly.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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 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.
1.5 Unless the order specifies the applicable “M” specification 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 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A388/A388M Practice for Ultrasonic Examination of Steel Forgings
A788/A788M Specification for Steel Forgings, General Requirements
E428 Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks Used in Ultrasonic Testing
American National StandardANSI B46.1 Surface Texture
ICS Number Code 21.120.10 (Shafts)
UNSPSC Code 31132100(Steel forgings); 26101749(Crankshaft)
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ASTM A503 / A503M-15(2020), Standard Specification for Ultrasonic Examination of Forged Crankshafts, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top