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ASTM F2328M-06

(Test Method)

Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs [Metric]

Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs [Metric]

SCOPE
1.1 This test method covers procedures for measuring, classifying, and determining the presence of decarburization and carburization in the threaded section of hardened and tempered metric steel bolts, screws, studs, and similar parts which have been heated to facilitate fabrication or to modify its mechanical properties. This test method is not intended to address products which are intentionally carburized to achieve specific results.
1.2 Two routine methods are described for measuring the limits of and determining the presence of decarburization or carburization; the Optical Method and the Microindentation Method 1. Either method is appropriate for routine examinations. The Microindentation Method 2 shall be considered the referee method.
1.3 For the purpose of these tests, there are four classes of hardened and tempered steel products for which specific measurements must be made with respect to their physical properties.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-May-2006
ICS
21.060.01 - Fasteners in general
77.140.20 - Stainless steels
Technical Committee
F16 - Fasteners
Drafting Committee
F16.01 - Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM F2328M-05 - Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs [Metric]
Effective Date
01-Jun-2006
Replaced By
ASTM F2328M-07 - Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs [Metric]
Effective Date
01-Oct-2007
Referred By
ASTM A962/A962M-23a - Standard Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
Effective Date
01-Jun-2006
Referred By
ASTM F2882/F2882M-17 - Standard Specification for Screws, Alloy Steel, Heat Treated, 170 ksi and 1170 MPa Minimum Tensile Strength (Inch and Metric)
Effective Date
01-Jun-2006
Referred By
ASTM F606/F606M-21 - Standard Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
Effective Date
01-Jun-2006
Referred By
ASTM F3125/F3125M-22 - Standard Specification for High Strength Structural Bolts and Assemblies, Steel and Alloy Steel, Heat Treated, Inch Dimensions 120 ksi and 150 ksi Minimum Tensile Strength, and Metric Dimensions 830 MPa and 1040 MPa Minimum Tensile Strength
Effective Date
01-Jun-2006

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ASTM F2328M-06 - Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs [Metric]ASTM F2328M-06 - Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs [Metric]
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ASTM F2328M-06 - Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs [Metric]
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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: F 2328M – 06
METRIC
Standard Test Method for
Determining Decarburization and Carburization in Hardened
and Tempered Threaded Steel Bolts, Screws and Studs
1
[Metric]
This standard is issued under the fixed designation F 2328M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope A 574M Specification for Alloy Steel Socket-Head Cap
Screws [Metric]
1.1 This test method covers procedures for measuring,
E3 Guide for Preparation of Metallographic Specimens
classifying, and determining the presence of decarburization
E 384 Test Method for Microindentation Hardness of Ma-
and carburization in the threaded section of hardened and
terials
tempered metric steel bolts, screws, studs, and similar parts
F 835M Specification for Alloy Steel Socket Button and
whichhavebeenheatedtofacilitatefabricationortomodifyits
Flat Countersunk Head Cap Screws [Metric]
mechanical properties. This test method is not intended to
F 912M Specification for Alloy Steel Socket Set Screws
address products which are intentionally carburized to achieve
[Metric]
specific results.
F 1789 Terminology for F16 Mechanical Fasteners
1.2 Two routine methods are described for measuring the
limits of and determining the presence of decarburization or
3. Terminology
carburization; the Optical Method and the Microindentation
3.1 Definitions:
Method 1. Either method is appropriate for routine examina-
3.1.1 carburization—process or result of increasing the
tions. The Microindentation Method 2 shall be considered the
carbon content of the surface layers of the steel fastener
referee method.
product.
1.3 For the purpose of these tests, there are four classes of
3.1.2 decarburization—in accordance with Terminology
hardened and tempered steel products for which specific
F 1789, is a loss of carbon from the surface layer of the
measurements must be made with respect to their physical
fastener, normally associated with heat treatment.
properties.
3.1.3 gross decarburization—also known as complete de-
1.4 This standard does not purport to address all of the
carburization, is characterized by a sufficient carbon loss to
safety concerns, if any, associated with its use. It is the
show only clearly defined ferrite grains.
responsibility of the user of this standard to establish appro-
3.1.4 partial decarburization—characterized as a loss of
priate safety and health practices and determine the applica-
carbon sufficient to cause a lighter shade of tempered marten-
bility of regulatory limitations prior to use.
site than that of the immediately adjacent base metal, but as
2. Referenced Documents being of insufficient carbon loss to show clearly defined ferrite
2
grains.
2.1 ASTM Standards:
4. Significance and Use
4.1 Decarburization and carburization are two surface con-
1
This test method is under the jurisdiction of ASTM Committee F16 on
ditions created, either intentionally or unintentionally, as with
Fasteners and is the direct responsibility of Subcommittee F16.01 on Test Methods.
a pre-existing condition created during the rod rolling process,
Current edition approved June 1, 2006. Published August 2006. Originally
approved in 2004. Last previous edition approved in 2005 as F 2328M – 05.
the rod/wire annealing process, or while heat treating threaded
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
steel products. Too much of either will adversely affect the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
safety and performance of the threaded product. Therefore,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. limits have been established for four different product groups:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
F 2328M – 06
the harder and greater the tensile strength of the product, the the specimen at 100X magnification using a method capable of
more susceptible to failure the product becomes if these limits measuring distances to at least 0.001 in. resolution. The width
are exceeded. of any light-etching band of martensite defines the depth of
4.2 When testing to a particular product specification that decarburization. Compare the image with Fig. 1 for the
lists the dimensions and microindentation data to be used, that maximum limits for G by taking a measurement on a line
data shall take precedence over the tables in this test method. perpendicular to the flank of the thread midway between the
4.3 There are only t
...

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ASTM F2328-17(2022)(Test Method)
Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws, Studs, and Nuts

SIGNIFICANCE AND USE
4.1 Decarburization and carburization are two surface conditions created, either intentionally or unintentionally, as with a pre-existing condition created during the rod rolling process, the rod/wire annealing process, or while heat treating threaded steel products. Too much of either will adversely affect the safety and performance of the threaded product. Therefore, limits have been established for three different product groups: the harder and greater the tensile strength of the product, the more susceptible to failure the product becomes if these limits are exceeded.  
4.2 When testing to a particular product specification that lists the dimensions and microindentation data to be used, that data shall take precedence over the tables in this test method.  
4.3 There are only two viable methods available to detect these deficiencies, either by the visual method or the microindentation method. Both methods are used for routine inspections when evaluations are conducted at a single location on the product sample.  
4.3.1 Because an evaluation at a specific location may not be representative of the whole part, the referee method employs the microindentation method taken as an average of evaluations conducted on four adjacent threads. This procedure significantly reduces the random test variables when compared to testing on a single thread.  
4.4 Specifying this test method does not specify or imply that testing shall be for either decarburization or carburization alone or for both conditions. When either test method is performed, both conditions will be apparent and shall be reported. For example, if an order is placed to test for decarburization and none is found, but the presence of carburization is detected, it shall be reported on the test report that carburization was found.
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1.1 This test method covers procedures for measuring, classifying, and determining the presence of decarburization and carburization in the threaded section of hardened and tempered inch series steel bolts, screws, studs, nuts, and similar parts which have been heated to facilitate fabrication or to modify their mechanical properties. This test method is not intended to address products which are intentionally carburized to achieve specific results.  
1.2 Two routine methods are described for measuring the limits of and determining the presence of decarburization or carburization—the optical method and the microindentation method 1. Either method is appropriate for routine examinations. The microindentation method 2 shall be considered the referee method.  
1.3 For the purpose of these tests, there are four classes of hardened and tempered steel products for which specific measurements must be made with respect to their physical properties.  
1.4 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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.  
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ASTM F2328M-17(2022)(Test Method)
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SIGNIFICANCE AND USE
4.1 Decarburization and carburization are two surface conditions created, either intentionally or unintentionally, as with a pre-existing condition created during the rod rolling process, the rod/wire annealing process, or while heat treating threaded steel products. Too much of either will adversely affect the safety and performance of the threaded product. Therefore, limits have been established for four different product groups: the harder and greater the tensile strength of the product, the more susceptible to failure the product becomes if these limits are exceeded.  
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1.1 This test method covers procedures for measuring, classifying, and determining the presence of decarburization and carburization in the threaded section of hardened and tempered metric steel bolts, screws, studs, nuts and similar parts which have been heated to facilitate fabrication or to modify their mechanical properties. This test method is not intended to address products which are intentionally carburized to achieve specific results.  
1.2 Two routine methods are described for measuring the limits of and determining the presence of decarburization or carburization; the Optical Method and the Microindentation Method 1. Either method is appropriate for routine examinations. The Microindentation Method 2 shall be considered the referee method.  
1.3 For the purpose of these tests, there are five classes of hardened and tempered steel products for which specific measurements must be made with respect to their physical properties.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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.  
1.6 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.

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SIGNIFICANCE AND USE
4.1 Decarburization and carburization are two surface conditions created, either intentionally or unintentionally, as with a pre-existing condition created during the rod rolling process, the rod/wire annealing process, or while heat treating threaded steel products. Too much of either will adversely affect the safety and performance of the threaded product. Therefore, limits have been established for three different product groups: the harder and greater the tensile strength of the product, the more susceptible to failure the product becomes if these limits are exceeded.  
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4.3 There are only two viable methods available to detect these deficiencies, either by the visual method or the microindentation method. Both methods are used for routine inspections when evaluations are conducted at a single location on the product sample.  
4.3.1 Because an evaluation at a specific location may not be representative of the whole part, the referee method employs the microindentation method taken as an average of evaluations conducted on four adjacent threads. This procedure significantly reduces the random test variables when compared to testing on a single thread.  
4.4 Specifying this test method does not specify or imply that testing shall be for either decarburization or carburization alone or for both conditions. When either test method is performed, both conditions will be apparent and shall be reported. For example, if an order is placed to test for decarburization and none is found, but the presence of carburization is detected, it shall be reported on the test report that carburization was found.
SCOPE
1.1 This test method covers procedures for measuring, classifying, and determining the presence of decarburization and carburization in the threaded section of hardened and tempered inch series steel bolts, screws, studs, nuts, and similar parts which have been heated to facilitate fabrication or to modify their mechanical properties. This test method is not intended to address products which are intentionally carburized to achieve specific results.  
1.2 Two routine methods are described for measuring the limits of and determining the presence of decarburization or carburization—the optical method and the microindentation method 1. Either method is appropriate for routine examinations. The microindentation method 2 shall be considered the referee method.  
1.3 For the purpose of these tests, there are four classes of hardened and tempered steel products for which specific measurements must be made with respect to their physical properties.  
1.4 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.  
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SIGNIFICANCE AND USE
4.1 Decarburization and carburization are two surface conditions created, either intentionally or unintentionally, as with a pre-existing condition created during the rod rolling process, the rod/wire annealing process, or while heat treating threaded steel products. Too much of either will adversely affect the safety and performance of the threaded product. Therefore, limits have been established for four different product groups: the harder and greater the tensile strength of the product, the more susceptible to failure the product becomes if these limits are exceeded.  
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    sale 15% off
  • Guide
    4 pages
    English language
    sale 15% off