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FW: [MW:20079] MOC for - 105 DegC

By Materials & Welding
 
Hi Nilesh,
 
SA 203GrE(plate) and SA 350LF3(forgings) are back back to specifications of 3.5% Nickel steels. As per ASTM specifications both materials are typically guaranteed for impact up to -101Deg C.
 
The design temperature  for the compressors is -105DegC. SA 203 Gr E base metal will certainly meet the impact requirements @-105Deg C , however the welds could be a suspect   for  impact strength, if welded with matching 3.5% Nickel steel filler metal or electrode.
 
See the attached information from Bohler Thysen for your reference. The purpose of attaching this document is to highlight the problem , not to point out any deficiency of any product. It  may be worthwhile to discuss  impact requirements @ -105Deg C with any reputed electrode manufacturer.
 
At the same time what are  the impact requirements as per clients' specifications , test temperature vs. the impact values, both for base metal and weld  following welding and PWHT ?
 
Please see some attached information as guidance.
 
I would think it would be worthwhile to discuss this issue with your  client and the consumable manufacturers like Thyssen or others.
 
Thanks.
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
pgoswami@quickclic.net
pgoswami@sympatico.ca
 
 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Darji Nilesh (Mumbai - Machinery)
Sent: Tuesday, February 11, 2014 8:41 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:20070] MOC for - 105 DegC

Its for Ethylene Service. Compressor Casing Material.

 

Regards,

 

Nilesh

5805

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shashank Vagal
Sent: Tuesday, February 11, 2014 6:46 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:20069] MOC for - 105 DegC

 

That will be the next issue on agenda, what do you want to store Nilesh?

 

 

With Best Regards,

Shashank C Vagal 

 

On Tuesday, 11 February 2014 6:38 PM, JIGNESH RANA <2010jigs@gmail.com> wrote:

Is only the temperature deciding criteria for this?
What is the service?
Regards
Jignesh rana

On 11 Feb 2014 15:23, "Darji Nilesh (Mumbai - Machinery)" <N.Darji@ticb.com> wrote:

We have an application where the design temp. requirement is -105 DegC.

 

During 1st meeting Vendor agreed to supply MOC A203 Gr.E(Plate). Post PO vendor asking confirmation to change MOC to A350 Gr.LF3 (Forging).

 

Requesting to provide Material Characteristics for both the Material and Suitability of A350 Gr.LF3 (Forging) for -105 Deg C.

 

With regards,

 

Nilesh

 


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