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ASTM F 519 Document Information:
Title
Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments
ASTM International
Publication Date:
Jul 1, 2006
Scope:
This test method describes mechanical test methods and defines
acceptance criteria for coating and plating processes that can
cause hydrogen embrittlement in steels. Subsequent exposure to
chemicals encountered in service environments, such as fluids,
cleaning treatments or maintenance chemicals that come in contact
with the plated/coated or bare surface of the steel, can also be
evaluated.
This test method is not intended to measure the relative
susceptibility of different steels. The relative susceptibility of
different materials to hydrogen embrittlement may be determined in
accordance with Test Method F 1459 and Test Method F 1624.
This test method specifies the use of air melted AISI E4340
steel per SAE AMS-S-5000 (formerly MIL-S-5000) heat treated to 260
– 280 ksi (pounds per square inch x 1000) as the baseline. This
combination of alloy and heat treat level has been used for many
years and a large database has been accumulated in the aerospace
industry on its specific response to exposure to a wide variety of
maintenance chemicals, or electroplated coatings, or both.
Components with ultimate strengths higher than 260 – 280 ksi may
not be represented by the baseline. In such cases, the cognizant
engineering authority shall determine the need for manufacturing
specimens from the specific material and heat treat condition of
the component. Deviations from the baseline shall be reported as
required by section 12.1.2. The sensitivity to hydrogen
embrittlement shall be demonstrated for each lot of specimens as
specified in section 9.5.
Test procedures and acceptance requirements are speci- fied for
seven specimens of different sizes, geometries, and loading
configurations.
Pass/Fail Requirements—For plating/coating processes,
specimens must meet or exceed 200 h using a sustained load test
(SLT) at the levels shown in Table 3.
The loading conditions and pass/fail requirements for service
environments are specified in Annex A5.
If approved by the cognizant engineering authority, a
quantitative, accelerated (< 24 h) incremental step-load (ISL)
test as defined in Annex A3 may be used as an alternative to
SLT.
This test method is divided into two parts. The first part gives
general information concerning requirements for hydrogen
embrittlement testing. The second is composed of annexes that give
specific requirements for the various loading and specimen
configurations covered by this test method (see section 9.1 for a
list of types) and the details for testing service
environments.
The values stated in the foot-pound-second (fps) system in
inch-pound units are to be regarded as standard. The values given
in parentheses are mathematical conversions to SI units that are
provided for information only and are not considered standard.
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.
Keywords:
- cleaner
- coating
- delayed failure
- fluids
- hydrogen embrittlement
- maintenance chemicals
- plating/coating
- steel
- stress cracking
- threshold
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