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1.1 This specification covers continuous grain flow forged carbon and alloy steel crankshafts for medium speed diesel and natural gas engines.
1.2 The steel used in the manufacture of the forgings is required to be vacuum degassed.
1.3 Provision is made for treatment of designated surfaces of the crankshaft to provide enhanced fatigue strength, or wear resistance, or both.
1.4 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standards. Within the text and tables the SI units are shown in brackets. The values stated in each system are not exact equivalents, therefore each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.5 Unless the order specifies the applicable "M" specification designation, the material shall be furnished to the inch-pound units.
1.6 Except as specifically required in this specification, all provisions of Specification A 788 apply.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A503/A503M Specification for Ultrasonic Examination of Forged Crankshafts
A788/A788M Specification for Steel Forgings, General Requirements
A966/A966M Practice for Magnetic Particle Examination of Steel Forgings Using Alternating Current
A986/A986M Specification for Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings
E45 Test Methods for Determining the Inclusion Content of Steel
E112 Test Methods for Determining Average Grain Size
E340 Test Method for Macroetching Metals and Alloys
Other StandardsJISG0555 Microscopic Testing Method for the Non-Metallic Inclusions in Steel Available from Japanese Standards Association, 1-24 Akasaka 4, Minato-Ku, Tokyo 107, Japan.Available from Japanese Standards Organization (JSA), 4-1-24 Akasaka Minato-Ku, Tokyo, 107-8440, Japan, http://www.jsa.or.jp.
ICS Number Code 27.020 (Internal combustion engines)
UNSPSC Code 31132100(Steel forgings)