Maximum impact test energy
Maximum impact test energy
(OP)
Hi, I have a certificate of a plate, A 240 TP 316/316L thk.15mm, Rm=570 MPa, Rp0,2%=298Mpa, HB=169 Brinell, with Absorbed energy of Impact test 450 J.
Ok, it's stainless steel, but I think this value it's too high... What dou you think? Is it possible?
Ok, it's stainless steel, but I think this value it's too high... What dou you think? Is it possible?





RE: Maximum impact test energy
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P.E. Metallurgy, Plymouth Tube
RE: Maximum impact test energy
RE: Maximum impact test energy
in the scope of ASME BPVC and piping codes for evaluation of impact test values there is no requirements for absorbed energy. There are only requirements for the minimum lateral expansion opposite the notch, e.g. :
- ASME VIII/1, UHA-51(a)(2)(-a) shall be no less than 0.38 mm (0.015 in.), when the MDMT is −320°F (−196°C) and warmer,
- ASME VIII/2, 3.11.4.1.(b) shall be no less than 0.38 mm (0.015 in.), when the MDMT is −320°F (−196°C) and warmer
- ASME B31.3, Table 323.3.5 shall be no less than 0.38 mm (0.015 in.)
In the scope of ASME BPVC, if on the above mentioned certificate the lateral expansion is not stated this certificate have to be rejected.But acc. to my experience after rejection you will get immediately a apology by the material manufacturer for the spelling mistake and a new certificate with beautiful lateral expansion values.
Regards - Juergen
RE: Maximum impact test energy
Is there a way to check if this is a true value, knowing the standard tensile properties?
RE: Maximum impact test energy
Which location is this test for, how many samples at this location were tested and what energies were achieved? It's common to have a significant scatter in impact energies for a similar test location.
RE: Maximum impact test energy
No. Additional CVN testing would be required of the heat of material.
RE: Maximum impact test energy
S1.6 Records—The recorded results shall include the
specimen orientation, specimen size, test temperature, absorbed
energy values (if required), and lateral expansion
opposite the notch.
Regards
r6155
RE: Maximum impact test energy
I have seen this happen on 600lb-ft machines testing duplex stainless, the pendulum just stops, and you ruin the striker.
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P.E. Metallurgy, Plymouth Tube
RE: Maximum impact test energy
Try to avoid problems and waste time when tests are not required.
Regards
r6155
RE: Maximum impact test energy
Singular value of absorbed energy are 449, 450, 449. Lateral espansion, average value, is 2,29 mm
The test was taken after solution heat treatment (it's a test coupon of a formed head): may the heat treatment increase the absorbed energy?
@r6155
Wasting time? I know UHA-51, but impact test IS required by client despite of exemption by code.
RE: Maximum impact test energy
Regards
r6155
RE: Maximum impact test energy
RE: Maximum impact test energy
Hence, ¿wasting time?: YES
Regards
r6155
RE: Maximum impact test energy
RE: Maximum impact test energy
Regards
r6155
RE: Maximum impact test energy