ASTM G35-98(2010)

Standard Practice for Determining the Susceptibility of Stainless Steels and Related Nickel-Chromium-Iron Alloys to Stress-Corrosion Cracking in Polythionic Acids

SIGNIFICANCE AND USE
This environment provides a way of evaluating the resistance of stainless steels and related alloys to intergranular stress corrosion cracking. Failure is accelerated by the presence of increasing amounts of intergranular precipitate. Results for the polythionic acid test have not been correlated exactly with those of intergranular corrosion tests. Also, this test may not be relevant to stress corrosion cracking in chlorides or caustic environments.
The polythionic acid environment may produce areas of shallow intergranular attack in addition to the more localized and deeper cracking mode of attack. Examination of failed specimens is necessary to confirm that failure occurred by cracking rather than mechanical failure of reduced sections.
SCOPE
1.1 This practice covers procedures for preparing and conducting the polythionic acid test at room temperature, 22 to 25°C (72 to 77°F), to determine the relative susceptibility of stainless steels or other related materials (nickel-chromiumiron alloys) to intergranular stress corrosion cracking.
1.2 This practice can be used to evaluate stainless steels or other materials in the “as received” condition or after being subjected to high-temperature service, 482 to 815°C (900 to 1500°F), for prolonged periods of time.
1.3 This practice can be applied to wrought products, castings, and weld metal of stainless steels or other related materials to be used in environments containing sulfur or sulfides. Other materials capable of being sensitized can also be tested in accordance with this test.
1.4 This practice may be used with a variety of stress corrosion test specimens, surface finishes, and methods of applying stress.
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 and health practices and determine the applicability of regulatory limitations prior to use. For more specific precautionary statements, see Section 7.

General Information

• Status: Historical
• Publication Date: 31-Aug-2010
• ICS: 77.040.10 - Mechanical testing of metals
• ICS: 77.060 - Corrosion of metals
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.06 - Environmentally Assisted Cracking

Relations

• Replaces: ASTM G35-98(2004) - Standard Practice for Determining the Susceptibility of Stainless Steels and Related Nickel-Chromium-Iron Alloys to Stress-Corrosion Cracking in Polythionic Acids
• Effective Date: 01-Sep-2010
• Referred By: ASTM G30-22 - Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens
• Effective Date: 01-Sep-2010
• Referred By: ASTM G58-85(2015) - Standard Practice for Preparation of Stress-Corrosion Test Specimens for Weldments
• Effective Date: 01-Sep-2010
• Referred By: ASTM G49-85(2019) - Standard Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens
• Effective Date: 01-Sep-2010
• Referred By: ASTM G168-17 - Standard Practice for Making and Using Precracked Double Beam Stress Corrosion Specimens
• Effective Date: 01-Sep-2010

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: G35 − 98(Reapproved 2010)
Standard Practice for
Determining the Susceptibility of Stainless Steels and
Related Nickel-Chromium-Iron Alloys to Stress-Corrosion
Cracking in Polythionic Acids
ThisstandardisissuedunderthefixeddesignationG35;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope G15TerminologyRelatingtoCorrosionandCorrosionTest-
ing (Withdrawn 2010)
1.1 This practice covers procedures for preparing and con-
G30 Practice for Making and Using U-Bend Stress-
ducting the polythionic acid test at room temperature, 22 to
Corrosion Test Specimens
25°C (72 to 77°F), to determine the relative susceptibility of
stainlesssteelsorotherrelatedmaterials(nickel-chromiumiron
3. Summary of Practice
alloys) to intergranular stress corrosion cracking.
3.1 Thestressedspecimensareplacedinthecontaineralong
1.2 This practice can be used to evaluate stainless steels or
withasensitizedandstressedAISIType302(UNSS30200)or
other materials in the “as received” condition or after being
Type 304 (UNS S30400) stainless steel control specimen. A
subjected to high-temperature service, 482 to 815°C (900 to
sufficient amount of the previously prepared polythionic acid
1500°F), for prolonged periods of time.
solution is added to the container to immerse the test speci-
1.3 This practice can be applied to wrought products,
mens.Acover is placed on the container and the test is carried
castings, and weld metal of stainless steels or other related
out at room temperature.
materials to be used in environments containing sulfur or
sulfides. Other materials capable of being sensitized can also
4. Significance and Use
be tested in accordance with this test.
4.1 This environment provides a way of evaluating the
1.4 This practice may be used with a variety of stress
resistance of stainless steels and related alloys to intergranular
corrosion test specimens, surface finishes, and methods of
stresscorrosioncracking.Failureisacceleratedbythepresence
applying stress.
of increasing amounts of intergranular precipitate. Results for
1.5 This standard does not purport to address all of the
the polythionic acid test have not been correlated exactly with
safety concerns, if any, associated with its use. It is the
thoseofintergranularcorrosiontests.Also,thistestmaynotbe
responsibility of the user of this standard to establish appro-
relevant to stress corrosion cracking in chlorides or caustic
priate safety and health practices and determine the applica-
environments.
bility of regulatory limitations prior to use. For more specific
4.2 The polythionic acid environment may produce areas of
precautionary statements, see Section 7.
shallow intergranular attack in addition to the more localized
and deeper cracking mode of attack. Examination of failed
2. Referenced Documents
specimens is necessary to confirm that failure occurred by
2.1 ASTM Standards:
cracking rather than mechanical failure of reduced sections.
D1193Specification for Reagent Water
G1Practice for Preparing, Cleaning, and Evaluating Corro-
5. Apparatus
sion Test Specimens
5.1 Any suitable glass or other transparent, inert container
canbeusedtocontaintheacidsolutionandstressedspecimens
This practice is under the jurisdiction ofASTM Committee G01 on Corrosion during the period of test at room temperature, 22 to 25°C (72
of Metals and is the direct responsibility of Subcommittee G01.06 on Environmen-
to 77°F). The container should be fitted with a removable top
tally Assisted Cracking.
to reduce evaporation and to allow access to the stressed
Current edition approved Sept. 1, 2010. Published November 2010. Originally
specimen (or specimens) for the periodic inspection.
approved in 1988. Last previous edition approved in 2004 as G35–98(2004). DOI:
10.1520/G0035-98R10.
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 last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
G35 − 98 (2010)
6. Reagents 8. Test Specimens
6.1 Purity of Reagents—The polythionic acid solution shall 8.1 Any type of stress corrosion test specimen can be used
be prepared using reagent grade sulfurous acid and technical with this test solution. For a comprehensive discussion of the
grade hydrogen sulfide; or, distilled water, commercial grade various types of test specimens available, see Ref (7), as well
sulfur dioxide, and technical grade hydrogen sulfide. as Practices G1 and G30, and Terminology G15.
6.2 Purity of Water—Reagent water Type IV (Specification 8.2 The AISI Type 302 control specimens should be sensi-
D1193) shall be used to prepare the test solutions. tized by heating in a furnace for 4 h at 650°C (1200°F) and
thenallowingtoaircool.TheAISIType304controlspecimens
6.3 Wackenroder’s or Polythionic Acid Solution (1) —A
should be sensitized by heating in a furnace for2hat 677°C
slow current of hydrogen sulfide is passed for an hour through
(1250°F) and then allowing to air cool.
a fritted glass tube into a flask containing chilled (0°C, 32°F)
6% sulfurous acid, after which the liquid is kept in the
9. Procedure
stoppered flask for 48 h at room temperature.This operation is
9.1 Preparethepolythionicacidtestsolutionasdescribedin
repeated until the liquid no longer gives off the odor of sulfur
6.3 and 6.3.1.
dioxide after standing at room temperature for a few hours.
Note safety precautions in Section 7.
9.2 Prior to usage, filter the acid solution to remove the
6.3.1 In an alternative method (2), the polythionic acid
excesssulfurandtestforthepresenceofpolythionicacids.The
solutionispreparedbypassingaslowcurrentofsulfurdioxide
simplest meth
...