Re: [MW:16396] Stress Relieving heat treatment of Monel 400

Mr.Sanjay,

Welded MONEL alloy 400 components normally go into service as welded. If there is a concern that the
environment could induce stress corrosion cracking (e.g, steam containing ammonia), the structure could
be stress relieved by heat treatment at 620 ⁰ C to 760 ⁰ C. It could be done by using LPG pumping,
Electrical Resistance heating, Furnace  etc.

Sridhar.
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From: Rajagopal Kannan <rajagopal.kannan@gmail.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Monday, 31 December 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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