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Description of ASTM-A983 2011ASTM A983 / A983M - 06(2011)Standard Specification for Continuous Grain Flow Forged Carbon and Alloy Steel Crankshafts for Medium Speed Diesel EnginesActive Standard ASTM A983 / A983M | Developed by Subcommittee: A01.06 Book of Standards Volume: 01.05 ASTM A983 / A983MAbstract This specification deals with continuous grain flow carbon and alloy steel crankshaft forgings intended for medium speed diesel and natural gas engines. The steel used in the manufacture of the forgings is required to be vacuum degassed. Heat treatment, which may be done either before or after rough machining, shall consist of normalizing followed by tempering at a subcritical temperature, or austenitizing, liquid quenching and subcritical tempering. Charpy impact and tensile tests, which shall be performed at a frequency of one test per heat treatment load, shall be used to evaluate tensile strength, yield strength, elongation, reduction of area, and Brinell hardness requirements of forgings. Chemical composition requirements shall also be examined by heat analysis. Grain size tests and non-destructive magnetic particle examinations shall be conducted as well. When required by the purchaser, crankshafts may be surface hardened in designated areas for the purposes of enhanced wear resistance and fatigue strength. 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. Scope 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 The choice of steel composition grade for a given strength class is normally made by the forging supplier, unless otherwise specified by the purchaser. 1.4 Provision is made for treatment of designated surfaces of the crankshaft to provide enhanced fatigue strength, or wear resistance, or both. 1.5 Except as specifically required in this specification, all provisions of Specification A788/A788M apply. 1.6 Unless the order specifies the applicable M specification designation, the material shall be furnished to the inch-pound units. 1.7 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 exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
ASTM Standards 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 Standards JISG0555 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.Keywords crankshafts, continuous grain flow; medium speed diesel engines; steel forgings; surface hardening; Railroad locomotive engines; Alloy steel crankshafts--specifications; Carbon steel crankshafts--specifications; Continuous grain flow (CGF) crankshafts; Crankshafts; Diesel engines; Gasoline engines; Medium speed diesel engine; ICS Code ICS Number Code 27.020 (Internal combustion engines) DOI: 10.1520/A0983_A0983M-06R11 ASTM International is a member of CrossRef. ASTM A983 / A983MThis book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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