Friday, September 3, 2010

[MW:6835] MW: 6811-- JIS G 3115 SPV 490 Q in welding requirement

Hello Tran,
 
Please find some relevant information on JIS G 3115 SPV 490 Q steel. This steel is C-Mn (high Mn) steel with enhanced tensile properties. The nearest ASME equivalence of this would be SA 537 Cl2 or Cl 3(C-Mn steel category) or SA737 GrB(HSLA category).
 
ASME does not include  this material, in the latest 2010 code, so you need to have the correct allowable stress values  for proper design calculation for an ASME coded design.
 
I would think SPV 490 Q stands for quenched and tempered grade. The correct PWHT temperature should be either less than or at least equal to  tempering temperature.
 
These steel is a well engineered steel .Suggested preheat temperature  for 24 mm of wall thickness should not be more than 100 deg C and max interpass being not greater than 175 deg C and with a heat input control of 2-2.5 KJ/mm
 
As welded and PWHT-ed hardness could be easily 225 HB or more .This is due to the fact that the minimum tensile strength of this steel and the consumables (E-9018G) series are in 90ksi series.
 
If you ask the steel mill for up to date information, they would be in a position to supply or typically the Japanese welding consumable manufacturers.Is you could share those info in the forum it would be appreciated.
 
I hope the attached information would be of interest to you.
 
Thanks.
 

Pradip Goswami,P.Eng.

Welding & Metallurgical Engineer/Specialist

Ontario Power Generation Inc.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Tran Van Vuong
Sent: Tuesday, August 31, 2010 9:37 PM
To: materials-welding@googlegroups.com
Subject: [MW:6811] JIS G 3115 SPV 490 Q in welding requirement

Hi everybody

 

Can you support me some information for JIS G 3115 SPV 490 Q in welding requirements with thickness over 24 mm in sphere tank according to ASME VIII Div.2:

-          Preheat

-          Post weld heat treatment

-          Hardness testing requirement for PQR

 

Thank you & Best regards

 

TRAN VAN VUONG

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