ASTM G38-01

Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens

SCOPE
1.1 This practice describes the essential features of the design and machining, and procedures for stressing, exposing, and inspecting C-ring type of stress-corrosion test speci- mens. An analysis is given of the state and distribution of stress in the C-ring.  
1.2 Specific considerations relating to the sampling process and to the selection of appropriate test environments are outside the scope of this practice.  
1.3 The values stated in SI units are to be regarded as standard. The inch-pound units are provided for information.  
1.4 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: 09-May-2001
• ICS: 77.060 - Corrosion of metals
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.06 - Environmentally Assisted Cracking

Relations

• Replaces: ASTM G38-73(1995)E1 - Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens
• Effective Date: 10-May-2001
• Replaced By: ASTM G38-01(2007) - Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens
• Effective Date: 01-May-2007
• Referred By: ASTM G52-20 - Standard Practice for Exposing and Evaluating Metals and Alloys in Surface Seawater
• Effective Date: 10-May-2001
• Referred By: ASTM F519-18 - Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments
• Effective Date: 10-May-2001
• Referred By: ASTM G58-85(2015) - Standard Practice for Preparation of Stress-Corrosion Test Specimens for Weldments
• Effective Date: 10-May-2001
• Referred By: ASTM G103-97(2023)e1 - Standard Practice for Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6 % Sodium Chloride Solution
• Effective Date: 10-May-2001
• Referred By: ASTM G41-90(2018) - Standard Practice for Determining Cracking Susceptibility of Metals Exposed Under Stress to a Hot Salt Environment
• Effective Date: 10-May-2001
• Referred By: ASTM G47-22 - Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products
• Effective Date: 10-May-2001
• Referred By: ASTM G186-05(2021) - Standard Test Method for Determining Whether Gas-Leak-Detector Fluid Solutions Can Cause Stress Corrosion Cracking of Brass Alloys
• Effective Date: 10-May-2001
• Referred By: ASTM G111-21a - Standard Guide for Corrosion Tests in High Temperature or High Pressure Environment, or Both
• Effective Date: 10-May-2001

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: G 38 – 01
Standard Practice for
1
Making and Using C-Ring Stress-Corrosion Test Specimens
ThisstandardisissuedunderthefixeddesignationG38;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope tubingandrodandformakingshort-transversetestsofvarious
products as illustrated for plate in Fig. 1.
1.1 This practice describes the essential features of the
design and machining, and procedures for stressing, exposing,
5. Sampling
and inspecting C-ring type of stress-corrosion test specimens.
5.1 Test specimens shall be taken from a location and with
Ananalysisisgivenofthestateanddistributionofstressinthe
an orientation so that they adequately represent the material to
C-ring.
be tested.
1.2 Specific considerations relating to the sampling process
5.2 In testing thick sections that have a directional grain
and to the selection of appropriate test environments are
structure, it is essential that the C-ring be oriented in the
outside the scope of this practice.
section so that the direction of principal stress (parallel to the
1.3 The values stated in SI units are to be regarded as
stressing bolt) is in the direction of minimum resistance to
standard. The inch-pound units are provided for information.
stress-corrosion cracking. For example, in the case of alumi-
1.4 This standard does not purport to address all of the
3
numalloys (1), thisistheshort-transversedirectionrelativeto
safety concerns, if any, associated with its use. It is the
the grain structure. If the ring is not so oriented it will tend to
responsibility of the user of this standard to establish appro-
crack off-center at a location where the stress is unknown.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Specimen Design
6.1 Sizes for C-rings may be varied over a wide range, but
2. Referenced Documents
5
C-ringswithanoutsidediameterlessthanabout16mm( ⁄8in.)
2.1 NACE Document:
are not recommended because of increased difficulties in
NACE TM0177–96 Laboratory Testing of Metals for Re-
machining and decreased precision in stressing. The dimen-
sistance to Sulfide Stress Cracking and Stress Corrosion
2 sions of the ring can affect the stress state, and these consid-
Cracking in H S Environments
2
erations are discussed in Section 7.Atypical shop drawing for
3. Summary of Practice the manufacture of a C-ring is shown in Fig. 2.
3.1 This practice involves the preparation of and the quan-
7. Stress Considerations
titative stressing of a C-ring stress-corrosion test specimen by
7.1 The stress of principal interest in the C-ring specimen is
application of a bending load. Characteristics of the stress
the circumferential stress. It should be recognized that this
system and the distribution of stresses are discussed. Guidance
stressisnotuniform(2,3).First,thereisagradientthroughthe
is given for methods of exposure and inspection.
thickness, varying from a maximum tension on one surface to
4. Significance and Use amaximumcompressionontheoppositesurface.Secondly,the
stress varies around the circumference of the C-ring from zero
4.1 The C-ring is a versatile, economical specimen for
at each bolt hole to a maximum at the middle of the arc
quantitativelydeterminingthesusceptibilitytostress-corrosion
opposite the stressing bolt; the nominal stress is present only
cracking of all types of alloys in a wide variety of product
alongalineacrosstheringatthemiddleofthearc.Thus,when
forms. It is particularly suitable for making transverse tests of
the specimen is stressed by measuring the strain on the tension
surface of the C-ring, the strain gage should be positioned at
1
This practice is under the jurisdiction ofASTM Committee G01 on Corrosion the middle of the arc in order to indicate the maximum strain.
of Metals and is the direct responsibility of Subcommittee G01.06 on Stress-
Corrosion Cracking and Corrosion Fatigue.
Current edition approved May 10, 2001. Published May 2001. Originally
e1
published as G38-73. Last previous edition G38-73 (1995) .
2 3
AvailablefromNationalAssociationofCorrosionEngineers(NACE),P.O.Box Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
218340, Houston, TX 77218–8340. this practice.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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G38
7.4 The possibility of residual stress should always be
considered, especially when C-rings are machined from prod-
ucts that contai
...