ASTM A983/A983M-06(2016)

Standard Specification for Continuous Grain Flow Forged Carbon and Alloy Steel Crankshafts for Medium Speed Diesel Engines

ABSTRACT
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.
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.

General Information

• Status: Historical
• Publication Date: 29-Feb-2016
• ICS: 27.020 - Internal combustion engines
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A983/A983M −06 (Reapproved 2016)
Standard Specification for
Continuous Grain Flow Forged Carbon and Alloy Steel
1
Crankshafts for Medium Speed Diesel Engines
This standard is issued under the fixed designationA983/A983M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* A788/A788M Specification for Steel Forgings, General Re-
quirements
1.1 This specification covers continuous grain flow forged
A966/A966M Practice for Magnetic Particle Examination of
carbon and alloy steel crankshafts for medium speed diesel and
Steel Forgings Using Alternating Current
natural gas engines.
A986/A986M Specification for Magnetic Particle Examina-
1.2 The steel used in the manufacture of the forgings is
tion of Continuous Grain Flow Crankshaft Forgings
required to be vacuum degassed.
E45 Test Methods for Determining the Inclusion Content of
Steel
1.3 The choice of steel composition grade for a given
strength class is normally made by the forging supplier, unless E112 Test Methods for Determining Average Grain Size
E340 Practice for Macroetching Metals and Alloys
otherwise specified by the purchaser.
2.2 Other Standards:
1.4 Provision is made for treatment of designated surfaces
3
AWS D1.1 Structural Welding Code
of the crankshaft to provide enhanced fatigue strength, or wear
4
DIN 50 602
resistance, or both.
JIS G 0555 Microscopic Testing Method for the Non-
1.5 Except as specifically required in this specification, all
5
Metallic Inclusions in Steel
provisions of Specification A788/A788M apply.
1.6 Unless the order specifies the applicable “M” specifica-
3. Ordering Information
tion designation, the material shall be furnished to the inch-
3.1 In addition to the ordering requirements of Specification
pound units.
A788/A788M, the following items should be included:
1.7 The values stated in either inch-pound units or SI
3.2 Choice of mechanical property class from Table 1.
(metric) units are to be regarded separately as standard. Within
3.3 Choice of chemical composition Grade from Table 2 if
the text and tables the SI units are shown in brackets. The
this purchaser option is exercised (4.1.3).
values stated in each system are not exact equivalents;
therefore, each system shall be used independently of the other.
3.4 Whether surface hardening in designated areas is
Combining values from the two systems may result in noncon-
required, referencing Supplementary Requirements S10, S11,
formance with the specification.
or S12, and providing the necessary instructions.
3.5 For crankshafts designed to include welded counter-
2. Referenced Documents
weights the purchaser may specify an alternate welding code to
2
2.1 ASTM Standards:
AWS D1.1 Structural Welding Code.
A370 Test Methods and Definitions for Mechanical Testing
3.6 For alternate tensile and hardness test requirements
of Steel Products
specify Supplementary Requirement S2.
A503/A503M Specification for Ultrasonic Examination of
Forged Crankshafts
4. Materials and Manufacture
1
4.1 Melting Practice:
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
Current edition approved March 1, 2016. Published April 2016. Originally
3
approved in 1998. Last previous edition approved in 2011 as A983/A983M – 06 Available from American Welding Society (AWS), 8669 NW 36 St., #130,
(2011). DOI: 10.1520/A0983_A0983M-06R16. Miami, FL 33166-6672, http://www.aws.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Verlag Stahleisen Gmbh, Postfach 10 51 64, D-40042,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Düsseldorf, Germany, http://www.stahleisen.de.
5
Standards volume information, refer to the standard’s Document Summary page on Available from Japanese StandardsAssociation (JSA), Mita MT Bldg., 3-13-12
the ASTM website. Mita, Minato-ku, Tokyo 108-0073, Japan, http://www.jsa.or.jp.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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A983/A983M−06 (2016)
TABLE 1 Tensile and Hardness Requirements
Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7
Tensile Strength, ksi [Mpa] min 80 [550] 100 [690] 110 [760] 120 [830] 130 [900] 140 [965] 150 [1035]
Yield Strength, (0.2% offset), ksi [Mpa] min 45 [310] 70 [485] 80 [550] 90 [620] 100 [690] 110 [760] 120 [830]
Elongation, min % i
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: A983/A983M − 06 (Reapproved 2011) A983/A983M − 06 (Reapproved 2016)
Standard Specification for
Continuous Grain Flow Forged Carbon and Alloy Steel
1
Crankshafts for Medium Speed Diesel Engines
This standard is issued under the fixed designation A983/A983M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Editorial correction was made in Table 2 in March 2014.
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.
2. Referenced Documents
2
2.1 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 Practice for Macroetching Metals and Alloys
2.2 Other Standards:
3
AWS D1.1 Structural Welding Code
4
DIN 50 602
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.06
on Steel Forgings and Billets.
Current edition approved April 1, 2011March 1, 2016. Published June 2011April 2016. Originally approved in 1998. Last previous edition approved in 20062011 as
A983/A983M – 06.A983/A983M – 06 (2011). DOI: 10.1520/A0983_A0983M-06R11E01.10.1520/A0983_A0983M-06R16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American Welding Society, 550 NW Le Jeune Rd., Miami, FL 33126.Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami,
FL 33126,Society (AWS), 8669 NW 36 St., #130, Miami, FL 33166-6672, http://www.aws.org.
4
Available from Verlag Stahleisen mbh, Postfach 8229, D-4000 Dusseldorf, Germany.Gmbh, Postfach 10 51 64, D-40042, Düsseldorf, Germany, http://www.stahleisen.de.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A983/A983M − 06 (2016)
5
JIS G 0555 Microscopic Testing Method for the Non-Metallic Inclusions in Steel
3. Ordering Information
3.1 In addition to the ordering requirements of Specification A788/A788M, the following items should be included:
3.2 Choice of mechanical property class from Table 1.
3.3 Choice of chemical composition Grade from Table 2 if this purchaser option is exercised (4.1.3).
3.4 Whether surface hardening in designated areas is required, referencing Supplementary Requirements S10, S11, or S12, and
providing the necessary instructions.
3.5 For crankshafts designed to include welded counterweights the purchaser may specify an alternate welding code to AWS
D1.1 Structural Welding
...