PWHT requirment for SS 316L sour service
PWHT requirment for SS 316L sour service
(OP)
Is it required to PWHT 316L plates as per MR 175 for sour service ?
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PWHT requirment for SS 316L sour service
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PWHT requirment for SS 316L sour servicePWHT requirment for SS 316L sour service(OP)
Is it required to PWHT 316L plates as per MR 175 for sour service ?
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RE: PWHT requirment for SS 316L sour service
correct me if i am wrong =D
RE: PWHT requirment for SS 316L sour service
If the plates were cold formed, they should be re-solution annealed prior to service.
RE: PWHT requirment for SS 316L sour service
Rolling, is it considered cold forming ?
In addition, i've seen that the fluid inside is classified Lethal. Has this also an incidense on PWHT requirement ?
RE: PWHT requirment for SS 316L sour service
PWHT is NOT required nor prohibited for this material.
RE: PWHT requirment for SS 316L sour service
RE: PWHT requirment for SS 316L sour service
Is it the same case for cladded carbon steel with SS 316L ?
RE: PWHT requirment for SS 316L sour service
The solution annealing of a shell after rolling requires special facilities. Am I right ?
RE: PWHT requirment for SS 316L sour service
(see § 3.5.1)
RE: PWHT requirment for SS 316L sour service
The problem is the introduction of strain into this material from forming. It is not a matter of enhancing mechanical properties, it has to do with precipitation of carbides in-service at locations of strain from forming. This is why solution annealing is critical for these materials after forming.
RE: PWHT requirment for SS 316L sour service
I still don't agree. Since SS316 accepts a very high strain and again as specified in the MR175 annealing is required only if cold forming is to enhanse mechanical proprety (to harden the steel). My be the case is applicable for dish head manufacturing
RE: PWHT requirment for SS 316L sour service
Ok, we can disagree. My final comment is look at ASME B&PV Code, Section I, PG-19. Look at what is required when % strain is introduced into the material - not for enhancement of mechanical properties but simply from forming strains. You can then decide what is right -
PG-19 COLD FORMING OF AUSTENITIC
MATERIALS8
The cold-formed areas of pressure-retaining components
manufactured of austenitic alloys shall be heat treated for
20 min per inch of thickness or for 10 min, whichever is
greater, at the temperatures given in Table PG-19 under
the following conditions:
(a) the finishing-forming temperature is below the minimum
heat-treating temperature given in Table PG-19....