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| |
 MPM
can supply low cost Charpy Quality Control Specimens (QCS) prepared in
conformance with ASTM E 23 for internal test machine performance
verification. The specimens provided are manufactured using the same
materials as the NIST verification specimens used for yearly test machine
verification. The energy ranges cover the standard verification energy
ranges: Low – 13 to 20 J; High – 88 to 136 J; and Super High – 176 to 244 J.
As with the NIST specimens, acceptable machine performance will produce
average values within 1.4 J or 5 % of the MPM supplied energy values. While
the QCS specimens are not intended for annual machine verification, they are
very useful for periodic machine performance verification.
When the quality control specimens are delivered, MPM
provides a data sheet similar to the one shown below. The data provide the
opportunity to compare results from customer test machines with MPM test machines, which are
traceable to NIST through the MPM Quality Assurance Program.
Heat LA1 (Low Energy)
Charpy
Impact Test Data for Low Impact Energy 4340 Steel Specimens Conducted at RT
and -40 C
Rockwell C
Hardness Data for this Heat Resulted in an Average of 45.2 with a Standard
Deviation of 0.36.
NOTE: It is recommended that low energy quality control testing for U-hammer
test machines be performed at -40 C since the specimens exit the rear of the
machine and thereby minimize interaction with the striker which can result
in larger data scatter.
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