Re: [MW:18298] Re: Cooling rate for 310S material after PWHT

Dear Marc:

You may refer to plate MTC and extract the parameters for solution
annealing heat treatment from there. For any PWHT, the material
certificate could be a very reliable reference.

If you do not have that info, you have to tell us more about the material,
which type of SS310 are you using...?
Is it a Nb-stabilized...?
What about Nitrogen...?

Regards
Ramin

On 7/30/13, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
> SS310S is best suited for high temp service due to its high oxidation temp
> (above 900 deg celsius) not suitable for high corrosive service. SS 310S
> generally will not get hardened if cold worked.
> Pandithan
>
>
> On Tue, Jul 30, 2013 at 11:28 AM, SV Swamy <svswamy@gmail.com> wrote:
>
>> It is not a stablilized steel but is suited for service in the
>> sensitization temperature range because of its high chromium content.
>> With
>> the allowed chemistry, 310S would have enough chromium to prevent rusting
>> even if all the carbon gets precipitated as chromium carbide (the main
>> cause of sensitization).
>>
>> As mentioned, we have used SS 310S extensively for chemical reactors
>> which
>> work in the temperature range of 500 - 900 C. No PWHT was ever needed or
>> used.
>>
>> Swamy
>>
>>
>> On Monday, July 29, 2013 4:54:28 PM UTC+5:30, kannayeram gnanapandithan
>> wrote:
>>>
>>> *SS310S is not a stabilized steel, in ASS only 321,347 &348 , some time
>>> 316Ti*
>>>
>>> Pandithan
>>> Welding Consultant
>>>
>>>
>>> On Mon, Jul 29, 2013 at 3:16 AM, Pierre Benzoni <fishf...@aol.com>
>>> wrote:
>>>
>>>> I'm reading what both groups are saying and the quick solution should
>>>> with all High Chromium and Nickel would be to cool with at a quick rate.
>>>> If
>>>> not the chrome and nickel burn. My first move while metal is hot would
>>>> be
>>>> to hand brush with a SS Hand brush. Once brushed and any burned nickle
>>>> is
>>>> removed, use a spray bottle with demineralized water and mist the welds
>>>> to
>>>> as a aid in cooling process. Just saved you from running a PQR.
>>>>
>>>> Signed very experanced
>>>> Union pipefitter welder
>>>> of 32 years of Local 9
>>>>
>>>>
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Jul 26, 2013, at 8:14 AM, SV Swamy <svs...@gmail.com> wrote:
>>>>
>>>> 310S is a highly stabilized grade with Chromium and Nickel content of
>>>> about 22% and carbon content of about 0.1% (I am writing now from
>>>> memory).
>>>> Even if the chromium carbide precipitation takes place because of slow
>>>> cooling rate, there would still be adequate chromium to ensure that the
>>>> steel remains stainless (>14%). So, the cooling rate is not critical.
>>>> However water cooling is not advisable because it can introduce
>>>> distortion
>>>> and residual stresses. We have in fact used 310S vessels in the service
>>>> temperature range of 500 - 900 C very successfully for many years.
>>>>
>>>> I would suggest that you use chilled air or chilled argon (if the extra
>>>> expense is not an issue) to minimize the distortion and also provide a
>>>> fast
>>>> cooling rate.
>>>>
>>>> If you need any more clarifications, pl. feel to write.
>>>>
>>>> Regards
>>>>
>>>> Swamy
>>>> Retired QA/QA Manager (Metallurgist)
>>>> Nuclear Fuel Complex, Dept. of Atomic Energy
>>>> Hyderabad, India
>>>>
>>>> On Wednesday, July 24, 2013 8:39:52 PM UTC+5:30, Marc Vleminckx wrote:
>>>>>
>>>>> We are building a 310S vessel, 22mm thick, that needs solution
>>>>> annealing. Within our organisation there are some questions about the
>>>>> cooling rate this vessel needs.
>>>>> ASME II SA-480 only say's the material needs to be quenched in water
>>>>> or
>>>>> rapidly cooled by other means.
>>>>> Somebody mentioned the temperature should drop from 1040°C to 427°C
>>>>> within 15 minutes to guarantee material requirements. Because of the
>>>>> design
>>>>> of the vessel and possible difficulty to maintain an equal cooling
>>>>> rate
>>>>> along the surface the choice was made to cool with forced air. To some
>>>>> of
>>>>> us a 600°C temp. drop with forced air in 15min is nearly impossible
>>>>> with
>>>>> forced air. So the main questions are "What is the definition of
>>>>> rapidly?",
>>>>> "Are there other means to reach this cooling rate?" and "Is there
>>>>> somebody
>>>>> who can provide this service within Holland or maybe Germany?".
>>>>> Heating
>>>>> rate is between 150 and 200°C/h starting from 482°C, and holding time
>>>>> 1h at
>>>>> 1040°C.
>>>>>
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--
*Ramin Kondori*
*Sr. QA/QC Engineer
*
*SINOPEC*

r.kondori@petroyada.com
+98-2123592322
+98-9132150320

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