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ASTM C692-05

(Test Method)

Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel

Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel

SCOPE
1.1 This test method covers two procedures for the laboratory evaluation of thermal insulation materials that actively contribute to external stress corrosion cracking (ESCC) of austenitic stainless steel due to soluble chlorides within the insulation. This laboratory procedure is not intended to cover all of the possible field conditions that contribute to ESCC.
1.2 While the 1977 edition of this test method (Dana test) is applicable only to wicking-type insulations, the procedures in this edition are intended to be applicable to all insulating materials, including cements, some of which disintegrate when tested in accordance with the 1977 edition. Wicking insulations are materials that wet through and through when partially (50 to 75 %) immersed in water for a short period of time (10 min or less).
1.3 These procedures are intended primarily as a preproduction test for qualification of the basic chemical composition of a particular manufacturer's product and are not intended to be routine tests for ongoing quality assurance or production lot compliance. Test Methods C 871, on the other hand, is used for confirmation of acceptable chemical properties of subsequent lots of insulation previously found acceptable by this test method.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.5This 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
30-Apr-2005
ICS
77.060 - Corrosion of metals
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.31 - Chemical and Physical Properties
Current Stage
Ref Project

Relations

Replaces
ASTM C692-00 - Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel
Effective Date
01-May-2005
Replaced By
ASTM C692-06 - Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel
Effective Date
01-Apr-2006
Referred By
ASTM C534/C534M-23 - Standard Specification for Preformed Flexible Elastomeric Cellular Thermal Insulation in Sheet and Tubular Form
Effective Date
01-May-2005
Referred By
ASTM C552-22 - Standard Specification for Cellular Glass Thermal Insulation
Effective Date
01-May-2005
Referred By
ASTM C795-08(2023) - Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel
Effective Date
01-May-2005
Referred By
ASTM C1617-19 - Standard Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from Thermal Insulation on Aqueous Corrosion of Metals
Effective Date
01-May-2005
Referred By
ASTM C871-18(2023) - Standard Test Methods for Chemical Analysis of Thermal Insulation Materials for Leachable Chloride, Fluoride, Silicate, and Sodium Ions
Effective Date
01-May-2005
Referred By
ASTM C1696-20 - Standard Guide for Industrial Thermal Insulation Systems
Effective Date
01-May-2005
Referred By
ASTM C929-14(2019) - Standard Practice for Handling, Transporting, Shipping, Storage, Receiving, and Application of Thermal Insulation Materials For Use in Contact with Austenitic Stainless Steel
Effective Date
01-May-2005

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ASTM C692-05 - Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless SteelASTM C692-05 - Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel
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ASTM C692-05 - Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel
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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: C 692 – 05
Standard Test Method for
Evaluating the Influence of Thermal Insulations on External
Stress Corrosion Cracking Tendency of Austenitic Stainless
1
Steel
This standard is issued under the fixed designation C692; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
1.1 This test method covers two procedures for the labora- 2.1 ASTM Standards:
tory evaluation of thermal insulation materials that actively A 240/A 240M Specification for Chromium and
contribute to external stress corrosion cracking (ESCC) of Chromium-Nickel Stainless Steel Plate, Sheet, and Strip
austenitic stainless steel due to soluble chlorides within the for Pressure Vessels and for General Applications
insulation. This laboratory procedure is not intended to cover A370 TestMethodsandDefinitionsforMechanicalTesting
all of the possible field conditions that contribute to ESCC. of Steel Products
1.2 Whilethe1977editionofthistestmethod(Danatest)is C795 Specification for Thermal Insulation for Use in Con-
applicable only to wicking-type insulations, the procedures in tact with Austenitic Stainless Steel
this edition are intended to be applicable to all insulating C871 Test Methods for Chemical Analysis of Thermal
materials,includingcements,someofwhichdisintegratewhen Insulation Materials for Leachable Chloride, Fluoride,
testedinaccordancewiththe1977edition.Wickinginsulations Silicate, and Sodium Ions
are materials that wet through and through when partially (50 G30 Practice for Making and Using U-Bend Stress Corro-
to 75%) immersed in water for a short period of time (10 min sion Test Specimens
or less).
3. Summary of Test Method
1.3 Theseproceduresareintendedprimarilyasapreproduc-
3.1 The procedures in this test method consist of using a
tion test for qualification of the basic chemical composition of
a particular manufacturer’s product and are not intended to be specimenofinsulationtoconductdistilled(ordeionized)water
routine tests for ongoing quality assurance or production lot by wicking or dripping to an outside surface, through the
insulation, to a hot inner surface of stressedType 304 stainless
compliance.TestMethodsC871,ontheotherhand,isusedfor
confirmation of acceptable chemical properties of subsequent steelforaperiodof28days.Ifleachablechloridesarepresent,
they are carried along with the water and concentrated at the
lots of insulation previously found acceptable by this test
method. hot surface by evaporation in much the same way as has been
experienced in actual industrial process situations.
1.4 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for 3.2 Exposed stainless steel coupons are examined visually,
and under 10 to 303 magnification, if necessary, to detect
information only.
1.5 This standard does not purport to address all of the ESCC after the prescribed period of exposure.
safety concerns, if any, associated with its use. It is the
4. Significance and Use
responsibility of the user of this standard to establish appro-
4.1 An inherent characteristic of some alloys of austenitic
priate safety and health practices and determine the applica-
stainless steel is their tendency to crack at stress points when
bility of regulatory limitations prior to use.
exposedtocertaincorrosiveenvironments.Themechanismsof
ESCC are complex and not completely understood but are
apparently related to certain metallurgical properties. Chloride
ions concentrated at a stress point will catalyze crack forma-
tion. It has been reported that other halide ions do not promote
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC16onThermal
2
InsulationandisthedirectresponsibilityofSubcommitteeC16.31onChemicaland For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Physical Properties. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved May 1, 2005. Published May 2005. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1971. Last previous edition approved 2000 as C692–00. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C692–05
ESCC to the same degree as does chloride using the test 5.4 Adhesives are tested by gluing together a test block of
3
technology of Test Method C692 (drip test). the insulation material to be used with the adhesive. The
4.2 Chlorides are common to many environment
...

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Note 1: The following ASTM standards are not requirements. They are reference for information only: Practice B537, Specification B456, Test Method B602, and Specification B604.  
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1.3 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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Standard Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements

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3.1 Electrochemical corrosion rate measurements often provide results in terms of electrical current. Although the conversion of these current values into mass loss rates or penetration rates is based on Faraday’s Law, the calculations can be complicated for alloys and metals with elements having multiple valence values. This practice is intended to provide guidance in calculating mass loss and penetration rates for such alloys. Some typical values of equivalent weights for a variety of metals and alloys are provided.  
3.2 Electrochemical corrosion rate measurements may provide results in terms of electrical resistance. The conversion of these results to either mass loss or penetration rates requires additional electrochemical information. Some approaches for estimating this information are given.  
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1.1 The terms and their definitions given herein represent terminology relating to wear and erosion of solid bodies due to mechanical interactions such as occur with cavitation, impingement by liquid jets or drops or by solid particles, or relative motion against contacting solid surfaces or fluids. This scope interfaces with but generally excludes those processes where material loss is wholly or principally due to chemical action and other related technical fields as, for instance, lubrication.  
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1.4 The purpose of this terminology is to encourage uniformity and accuracy in the description of test methods and devices and in the reporting of test results in relation to wear and erosion.
Note 1: All terms are listed alphabetically. When a subsidiary term is defined in conjunction with the definition of a more generic term, an alphabetically-listed cross-reference is provided.  
1.5 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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