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ASTM B 839 Document Information:
Title
Standard Test Method for Residual Embrittlement in Metallic Coated, Externally Threaded Articles, Fasteners, and RodInclined Wedge Method
ASTM International
Publication Date:
Apr 1, 2004
Scope:
This test method covers the determination of, on a statistical basis,
the probability of the
existence of hydrogen embrittlement or degradation in:
A batch of barrel electroplated, autocatalytic plated, phosphated, or
chemically processed threaded
articles or fasteners and
A batch of rack plated threaded articles, fasteners, or rod.
Industrial practice for threaded articles, fasteners, and rod has
evolved three graduated levels of
test exposure to ensure reduced risk of hydrogen embrittlement (see
Section 3). These levels have
evolved from commercial applications having varying levels of
criticality. In essence, they
represent the confidence level that is required. They also represent
the time that finished goods
are held before they can be shipped and used. This time equates to
additional cost to the
manufacturer that may of necessity be added to the cost of the
finished goods.
This test method is applicable to threaded articles, fasteners, and
rod made from steel with
≥ 1000 MPa (with corresponding hardness values of 300 HV10 kgf, 303
HB, or 31 HRc) or surface
hardened threaded articles, fasteners, or rod.
This test method shall be carried out after hydrogen embrittlement
relief heat treatment in
accordance with the requirements of Guide B 850. It may also be used
for assessing differences in
processing solutions, conditions, and techniques. This test method has
two main functions: first,
when used with a statistical sampling plan it can be used for lot
acceptance or rejection, and
second, it can be used as a control test to determine the
effectiveness of the various processing
steps including pre- and post-baking treatments to reduce the mobile
hydrogen in the articles,
fasteners, or rod. While this test method is capable of indicating
those items that are embrittled
to the extent defined in Section 3, it does not guarantee complete
freedom from embrittlement.
This test method does not relieve the processor from imposing and
monitoring suitable process
control.
This test method has been coordinated with ISO/DIS 10587 and is
technically equivalent. (Warning -
Great care should be taken when applying this test method. The heads
of embrittled articles,
fasteners, or rod may suddenly break off and become flying projectiles
capable of causing blindness
or other serious injury. This hazard can occur as long as 200 h after
the test has started. Hence,
shields or other apparatus should be provided to avoid such injury.)
NOTE 1 - Test Method F 1940 can be used as a process control and
verification to prevent hydrogen
embrittlement in fasteners covered by this test method.
NOTE 2 - The use of inhibitors in acid pickling baths does not
necessarily guarantee avoidance of
hydrogen embrittlement.
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:
- hydrogen embrittlement test
- metallic coated
- residual embrittlement test
- testing threaded articles
- threaded fasteners
- threaded rod
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