Re: [SUSPECTED SPAM] Re: [MW:14180] Hardness value without PWHT

Dear Sir,
I did PQR as per your suggested WPS but hardness is coming still more
i.e 230 to 287 BHN in weld zone in P-4 material. Pls guide me how can
i control the hardness without PWHT .
Thanks in advance.
Regards
Pradip

On 4/20/12, pgoswami <pgoswami@quickclic.net> wrote:
> Pradip,
>
> See these guidelines (PQR) below. This would be useful.Hardness > 250 HV is
> possible in P4 material, without PWHT.
>
> Let know.
>
> Thanks
>
>
> Pradip Goswami,P.Eng.IWE
> Welding & Metallurgical Specialist & Consultant
> Ontario, Canada.
> Email-pgoswami@sympatico.ca,
> <mailto:pgoswami@quickclic.net> pgoswami@quickclic.net
>
>
>
>
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com [
> <mailto:materials-welding@googlegroups.com>
> mailto:materials-welding@googlegroups.com] On Behalf Of pradip kumar sil
> Sent: Wednesday, April 18, 2012 2:32 AM
> To: materials-welding@googlegroups.com
> Cc: pgoswami
> Subject: Re: [SUSPECTED SPAM] Re: [MW:14119] Hardness value without PWHT
>
> Dear Sir,
> These are reformer tubes to header under B 31.3.
> As per design wall temperature are forecasted 200 to 220 degree centigrade.
> Considering that the elastic range of of P-11 material in ASME 31.3 is
> defined upto 482 degree centigrade & creep range goes upto 649 degree
> centigrade. The operating temp can not taken as high.
> In our application hydrogen partial pressure is 14 bar. ASME 31.3 allows to
> weld 7.5 mm thickness without PWHT. If we increase preheat temperature we
> will get any benefit. Guide me how can i control hardness in these case.
> Regards
> Pradip
>
>
>
>
>
> On 4/14/12, james gerald <gerry_tup@yahoo.com> wrote:
>> 225BHN hardness specified is for Weldment which includes weld metal,
>> HAZ & BM. PWHT is one of the method of reducing hardness.
>>
>> Other methods are Controlled cooling t8/5 which can be achieved by
>> increasing the preheat. Preheat can be increased just below Mf
>> temperature and try the Hardness values.
>>
>> You could try with a temper bead welding technique. There are
>> different methods of temper bead welding technique and you can select
>> the suitable one for your case eg a half bead technioque.
>>
>> Thanks & Regards
>>
>>
>> J.Gerald Jayakumar
>> 0091-9344954677
>>
>>
>> ________________________________
>> From: Ramchandra vichare <vicharerke@indiatimes.com>
>> To: materials-welding@googlegroups.com
>> Cc: pgoswami <pgoswami@quickclic.net>
>> Sent: Friday, April 13, 2012 2:43 PM
>> Subject: [SUSPECTED SPAM] Re: [MW:14106] Hardness value without PWHT
>>
>>
>> ----- Original Message -----
>>
>>
>> Dear friend,
>> First of all pl confirm which welding procedure you used
>> (i.e.GTAW+SMAW),or any one?
>>
>> See if you use welding technique GTAW by ER80SB2 + SMAW by E8018B2
>> hardness value will may be in controll.
>> Pl try & revert.
>>
>> Regards,
>> RK Vichare
>>
>>
>> From: pradip kumar sil <pradipsil@gmail.com>
>> To: materials-welding@googlegroups.com
>> Cc: pgoswami <pgoswami@quickclic.net>
>> Sent: Thu, 12 Apr 2012 10:50:16 +0530 (IST)
>> Subject: [MW:14104] Hardness value without PWHT
>>
>> Dear experts,
>> I have faced regarding hardness issue on ASTM A 335 GR P-11 material.
>> Pipe thickness is 7.5mm. Without PWHT hardness is coming around 275
>> to 289 BHN on weld zone & 250 260 BHN on HAZ zone & parent material
>> hardness is 197 to 204 BHN. Due to inside refractory material PWHT is
>> not possible.
>> My question is as per ASME B-31.3/ ASME SEC II PART A hardness value
>> of this material is 225 BHN ( MAX). There is any specification for
>> weld zone / HAZ zone hardness value.
>> Can anybody give an idea to reduce the hardness without PWHT if it is
>> not acceptable limit.
>> Thanx in advance.
>>
>> Regards
>> Pradip
>>
>> --
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>
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> For more options, visit this group's bolg at
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> http://materials-welding.blogspot.com/
> The views expressed/exchnaged in this group are members personel views and
> meant for educational purposes only, Users must take their own decisions
> w.r.t. applicable code/standard/contract documents.
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.