Re: [MW:16400] Stress Relieving heat treatment of Monel 400

Mr.Sanjay, 

Monel is suitable for HF service and the process licensor of HF handling vessels will provide complete guidelines on how to weld and inspect Monel material. Post weld heat treatment is more relevant with respect to process requirement and process licensors like UOP technologies will provide the details.This could be due to SCC point of view. We have carried out heat treatment of monel equipments. The heat treatment cycle and hardness limits are specified by licensors.Conventional heat treatment can be done. For example, welds can be heat treated with resistant coil method. No cleaning is required after heat treatment.

Regards,

S.Muralidharan.

From: Rajagopal Kannan <rajagopal.kannan@gmail.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Monday, December 31, 2012 3:49 PM
Subject: Re: [MW:16392] Stress Relieving heat treatment of Monel 400

Dear Sanjay,

As per UNF 56 of ASME sec. VIII Div.1, UNS N 04400 is not required to be Post Weld Heat treated.

Thanks and Best Regards,

K.Rajagopal

On Tue, Jun 1, 2010 at 3:16 PM, Sanjay Gandhi <sanjayseju88@gmail.com> wrote:

Hi,

 

Has any body come across requirement of PWHT or stress relieving for Monel 400? I have read some where that Monel 400 material that is to be used in HF acid service, welds must be given stress reliving treatment to minimize the risk of stress corrosion cracking. 

 

I am looking for following information.

1.) Whether post weld heat treatment is necessary for welds of Monel 400 operating in HF service. Any precedence of heat treatment or no heat treatment?

2.) If heat treatment is inevitable, how to carry out heat treatment of complete vessel? Conventional way by heating or any new technique, any specific furnace, any inert gas to be used, etc…

3.) Any cleaning treatment required after heat treatment? What is the effective method of cleaning?  

 

I would highly appreciate your inputs on the above. We have got two Monel 400 vessels to be used in HF services.

 

 

Regards,

 

Sanjay Gandhi

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