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Re: [MW:20614] RE: 20584] Quarry regarding SFA 5.5

By Materials & Welding
Dear Mr. Nikdin:

The reason why Ni+Mn should not exceed 1.5% is that it lowers the AC1 (austenitization temperature) which will cause either of following complications:

  1. Either your AC1 comes down and it is possible that PWHT temp goes higher than AC1, then instead of stress relieving you will see martensite formation during cooling which increases your hardness and creates new residual stress.
  2. Or you know about the above problem and are going to be careful about passing AC1. But your PWHT temp will drop below the required temperature for stress relieving. It means that either you do not relieve the stress or it will take a long time and costs you a lot.
Hence, it's better to limit the Ni+Mn content and save the trouble.

 

Best Regards

Ramin Kondori

Sr. QA/QC engineer

Yadavaran Oilfield Project

SIPC (SINOPEC)



On Mon, Apr 14, 2014 at 7:07 PM, John Henning <jhenning@deltak.com> wrote:

Ni and Mn depress the lower transformation temperature and the martensite finish temperature.  If excessive can result in PWHT being intercritical and/or the weld having retained (untransformed) austenite. 

 

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Himan Nikdin
Sent: Sunday, April 13, 2014 11:22 PM
To: materials-welding@googlegroups.com
Subject: [MW:20584] Quarry regarding SFA 5.5

 

Dear Experts

 

As per note "J" of Table 2 of SFA A5.5 (SPECIFICATION FOR LOW- ALLOY STEEL ELECTRODES FOR SHIELDED METAL ARC WELDING) which contain chemical composition requirements for weld metal Ni+Mn content shall be max. 1.5% for E9015-B9, E9016-B9, E9018-B9, the question is why?

 

Regards,

Himan Nikdin 

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