Wednesday, July 21, 2010

[MW:6059] [Fwd: RE: 0] Hardness Values at Weld Metal, HAZ & Parent Metel]

Hi Jose,

 

Here  are some brief responses to your queries on P-91/T-91 Steel:-

 

1.      Weather Section II/ Part A/ SA 335/10.1.1 is meant for parent materials & B31.3 /Table 331.1.1 is for weld materials after heat treatment?

 

·         Yes ,SA-335 applies to base materials in heat treated condition (265HV max), in N&T condition. While B-31.3 /Table 331.1.1 specified hardness of 253 HV is after welding and PWHT. If the as received hardness is 265HV then meeting 253 HV after welding and PWHT would be extremely difficult.

·         SA-335 specified tempering temperature range for this material is 730-8000 C, while B-31.3 recommended PWHT temperature range  for these welds is 704–760 0C. If hardness after PWHT is a requirement then it’s always advisable to get the material tempered at higher temperature and perform PWHT @ temperatures below or close to tempering temperature. Should one has to perform PWHT above the tempering temperature in order to meet hardness , then the microstructural balance of P-91 steel would get disturbed and may affect the long term service performance (creep rupture properties) of this steel.

 

2.      Is anywhere other than here hardness values(Weld metal, HAZ & Parent metal) are mentioned?What’re the design codes and specifications involved for your application ?  For P/T-91 other than ASME codes you would finds hardness restriction clauses in the following documents:-

·         NACE MR-103- Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments-248 HBW Max

·         API TECHNICAL REPORT ,938-B- Use of 9Cr-1Mo-V (Grade 91) Steel in the Oil Refining Industry-Recommended maximum allowable hardness is  248 HBW for process applications and 275 -300 HBW for electric utility services.

 

3.      Can anyone tell me hardness values (at WM, HAZ & PM) of commonly used materials of parent material group numbers P1,P4,P5  etc.....—

·         If your query is on hardness requirement as per B-31.3 code after welding and PWHT, then see table 311.1.1. For other applications  you have see the individual codes. Usually hardness restriction  is a service requirements, to avoid/ lessen environmental assisted cracking, predominantly various types of SCC. Since  ASME is followed by all types of  industries, hardness requirements or restrictions are not  incorporated as a general rule.

 

Hope this would help to clarify your query. If you have any further queries on P/T-91, feel free to drop a line. Correct specification is very important for this steel, then fabrication and other issues are lot easily solved.

 

 

Thanks.

 

Pradip Goswami, P.Eng.

Welding & Metallurgical Engineer/Specialist

Ontario Power Generation Inc.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

 

-----Original Message-----

From: materials-welding@googlegroups.com

[mailto:materials-welding@googlegroups.com] On Behalf Of JOSE SEBASTIAN

Sent: Wednesday, July 21, 2010 5:56 AM

To: Materials & Welding

Subject: [MW:0] Hardness Values at Weld Metal, HAZ & Parent Metel

 

Dear Friends,

 

 

It is mentioned in ASME Section II Part A,SA 335 10.1.1 that the maximum hardness value of T91 materials should be 265 HV, Also in ASME B 31.3

process piping Table 331.1.1 Requirements for heat treatment it is mentioned that the maximum hardness value should be 253HV for P5 group(T91).

 

My questions are..

 

1.Weather Section II/ Part A/ SA 335/10.1.1 is meant for parent materials & B31.3 /Table 331.1.1 is for weld materials after heat treatment?

2.Is anywhere other than here hardness values(Weld metal, HAZ & Parent metal) are mentioned?

3.Can anyone tell me hardness values(at WM,HAZ & PM) of commonly used materials of parent material group numbers P1,P4,P5  etc.....

 

 

Regards

 

Jose Sebastian

+919687660525

 

--

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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.

 

 

 


THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.

Hi Jose,


Here are some brief responses to your queries on P-91/T-91 Steel:-

1. Weather Section II/ Part A/ SA 335/10.1.1 is meant for parent
materials & B31.3 /Table 331.1.1 is for weld materials after heat
treatment?

* Yes ,SA-335 applies to base materials in heat treated
condition (265HV max), in N&T condition. While B-31.3 /Table 331.1.1
specified hardness of 253 HV is after welding and PWHT. If the as
received hardness is 265HV then meeting 253 HV after welding and PWHT
would be extremely difficult.

* SA-335 specified tempering temperature range for this material
is 730-8000 C, while B-31.3 recommended PWHT temperature range for
these welds is 704-760 0C. If hardness after PWHT is a requirement then
it's always advisable to get the material tempered at higher temperature
and perform PWHT @ temperatures below or close to tempering temperature.
Should one has to perform PWHT above the tempering temperature in order
to meet hardness , then the microstructural balance of P-91 steel would
get disturbed and may affect the long term service performance (creep
rupture properties) of this steel.

2. Is anywhere other than here hardness values(Weld metal, HAZ &
Parent metal) are mentioned?-What're the design codes and specifications
involved for your application ? For P/T-91 other than ASME codes you
would finds hardness restriction clauses in the following documents:-

* NACE MR-103- Materials Resistant to Sulfide Stress Cracking in
Corrosive Petroleum Refining Environments-248 HBW Max

* API TECHNICAL REPORT ,938-B- Use of 9Cr-1Mo-V (Grade 91) Steel
in the Oil Refining Industry-Recommended maximum allowable hardness is
248 HBW for process applications and 275 -300 HBW for electric utility
services.

3. Can anyone tell me hardness values (at WM, HAZ & PM) of commonly
used materials of parent material group numbers P1,P4,P5 etc.....-

* If your query is on hardness requirement as per B-31.3 code
after welding and PWHT, then see table 311.1.1. For other applications
you have see the individual codes. Usually hardness restriction is a
service requirements, to avoid/ lessen environmental assisted cracking,
predominantly various types of SCC. Since ASME is followed by all types
of industries, hardness requirements or restrictions are not
incorporated as a general rule.

Hope this would help to clarify your query. If you have any further
queries on P/T-91, feel free to drop a line. Correct specification is
very important for this steel, then fabrication and other issues are lot
easily solved.

Thanks.

Pradip Goswami, P.Eng.

Welding & Metallurgical Engineer/Specialist

Ontario Power Generation Inc.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

-----Original Message-----

From: materials-welding@googlegroups.com

[mailto:materials-welding@googlegroups.com] On Behalf Of JOSE SEBASTIAN

Sent: Wednesday, July 21, 2010 5:56 AM

To: Materials & Welding

Subject: [MW:0] Hardness Values at Weld Metal, HAZ & Parent Metel

Dear Friends,

It is mentioned in ASME Section II Part A,SA 335 10.1.1 that the maximum
hardness value of T91 materials should be 265 HV, Also in ASME B 31.3

process piping Table 331.1.1 Requirements for heat treatment it is
mentioned that the maximum hardness value should be 253HV for P5
group(T91).

My questions are..

1.Weather Section II/ Part A/ SA 335/10.1.1 is meant for parent
materials & B31.3 /Table 331.1.1 is for weld materials after heat
treatment?

2.Is anywhere other than here hardness values(Weld metal, HAZ & Parent
metal) are mentioned?

3.Can anyone tell me hardness values(at WM,HAZ & PM) of commonly used
materials of parent material group numbers P1,P4,P5 etc.....

Regards

Jose Sebastian

+919687660525

--

To post to this group, send email to materials-welding@googlegroups.com

To unsubscribe from this group, send email to

materials-welding-unsubscribe@googlegroups.com

For more options, visit this group's bolg at

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.

-----------------------------------------
THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED
RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED,
PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended
recipient, you are hereby notified that any review, retransmission,
dissemination, distribution, copying, conversion to hard copy or
other use of this communication is strictly prohibited. If you are
not the intended recipient and have received this message in error,
please notify me by return e-mail and delete this message from your
system. Ontario Power Generation Inc.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at 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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