ASTM G157-98(2013)
(Guide)Standard Guide for Evaluating Corrosion Properties of Wrought Iron- and Nickel-Based Corrosion Resistant Alloys for Chemical Process Industries
Standard Guide for Evaluating Corrosion Properties of Wrought Iron- and Nickel-Based Corrosion Resistant Alloys for Chemical Process Industries
SIGNIFICANCE AND USE
4.1 This guide is intended to provide a series of evaluations that will assist engineers dealing with chemical environments in selecting appropriate alloys (1-3). In chemical environments, an important issue for determining general corrosion resistance is the temperature at which an alloy transitions from corrosion at a low rate to corrosion at a much higher rate. Other important concerns include the tendency towards crevice corrosion and stress corrosion cracking resistance, especially in hot chloride-containing aqueous environments.
4.2 This guide is also intended for alloy developers to assist them in choosing environments and test methods that are of particular interest to the chemical process industries.
4.3 The use of this approach will allow direct comparisons to be made among alloys from various suppliers and, thereby, to assist engineers in selecting the most appropriate materials for further testing to determine suitability in their application.
SCOPE
1.1 This guide covers an evaluation approach that is designed to provide information on the corrosion properties of wrought iron- and nickel-based alloys for the chemical process industries. This guide incorporates test conditions for general corrosion measurements in a variety of environments, crevice corrosion resistance in chloride environments, and stress corrosion cracking resistance in chloride environments.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
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 and health practices and to determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation: G157 − 98 (Reapproved 2013)
Standard Guide for
Evaluating Corrosion Properties of Wrought Iron- and
Nickel-Based Corrosion Resistant Alloys for Chemical
1
Process Industries
This standard is issued under the fixed designation G157; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope G46Guide for Examination and Evaluation of Pitting Cor-
rosion
1.1 This guide covers an evaluation approach that is de-
G48Test Methods for Pitting and Crevice Corrosion Resis-
signed to provide information on the corrosion properties of
tance of Stainless Steels and Related Alloys by Use of
wroughtiron-andnickel-basedalloysforthechemicalprocess
Ferric Chloride Solution
industries. This guide incorporates test conditions for general
G123TestMethodforEvaluatingStress-CorrosionCracking
corrosion measurements in a variety of environments, crevice
of Stainless Alloys with Different Nickel Content in
corrosion resistance in chloride environments, and stress cor-
Boiling Acidified Sodium Chloride Solution
rosion cracking resistance in chloride environments.
3. Terminology
1.2 The values stated in SI units are to be regarded as
standard. The values given in parentheses are for information
3.1 Terms such as crevice corrosion, stress corrosion
only.
cracking, and corrosion rate are defined in Terminology G15.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 4.1 This guide is intended to provide a series of evaluations
that will assist engineers dealing with chemical environments
priate safety and health practices and to determine the
inselectingappropriatealloys(1-3).Inchemicalenvironments,
applicability of regulatory limitations prior to use.
animportantissuefordetermininggeneralcorrosionresistance
2. Referenced Documents
is the temperature at which an alloy transitions from corrosion
2
at a low rate to corrosion at a much higher rate. Other
2.1 ASTM Standards:
important concerns include the tendency towards crevice
D1193Specification for Reagent Water
corrosionandstresscorrosioncrackingresistance,especiallyin
G1Practice for Preparing, Cleaning, and Evaluating Corro-
hot chloride-containing aqueous environments.
sion Test Specimens
G15TerminologyRelatingtoCorrosionandCorrosionTest-
4.2 This guide is also intended for alloy developers to assist
3
ing (Withdrawn 2010)
them in choosing environments and test methods that are of
G30 Practice for Making and Using U-Bend Stress-
particular interest to the chemical process industries.
Corrosion Test Specimens
4.3 The use of this approach will allow direct comparisons
G36Practice for Evaluating Stress-Corrosion-Cracking Re-
to be made among alloys from various suppliers and, thereby,
sistance of Metals and Alloys in a Boiling Magnesium
to assist engineers in selecting the most appropriate materials
Chloride Solution
for further testing to determine suitability in their application.
5. General Corrosion Resistance
1
This guide is under the jurisdiction ofASTM Committee G01 on Corrosion of
5.1 The general corrosion resistance of nickel- and iron-
Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
Corrosion Tests.
based alloys is determined in 14 test solutions at various
CurrenteditionapprovedMay1,2013.PublishedJuly2013.Originallyapproved
temperatures to determine the lowest temperature at which the
in 1998. Last previous edition approved in 2005 as G157–98 (2005). DOI:
corrosion rate exceeds 0.13 mm/y (5 mpy). The test solutions
10.1520/G0157-98R13.
2
are listed in Table 1. A suggested procedure is provided in
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Appendix X1. The test is run on three coupons of metal for
Standards volume information, refer to the standard’s Document Summary page on
each environment. The tests are run for two 48-h exposures
the ASTM website.
3
with one specimen exposed for the total 96 h. Welded speci-
The last approved version of this historical standard is referenced on
www.astm.org. mens may be used if results are required on weldments.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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G157 − 98 (2013)
TABLE 1 Fourteen Environments for Evaluating General
Corrosion Resistance
A
Corrodent Formula Concentration, %
Hydrochloric Acid HCl 0.2, 1.0, 5.0
B
...
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