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
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 B850. 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
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 F1940 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.
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