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[MW:20591] RE: 20584] Quarry regarding SFA 5.5

By Materials & Welding

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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