Dick,
Attached are 2 documents on this material. The first document is the English version of the same data sheet attached in your email. The second one gives general guidelines on handling of this steel, fabrication, welding. Both of these documents are free documents (available in the web).
As pointed out by Mr. Hegde, welding of this steel would require the same level of care and precautions as need for a Q&T steel. As you can see NAXTRA has many grades, the higher grade means high UTS and lower % elongation, thus welding gets more and more difficult. Usually for SMAW with E-9018M or 10018M are welder friendly electrodes (due to slightly lower UTS and better %EL), E-11018M would require careful handling during welding due to higher as welded tensile stresses involved.
I have not handled NAXTRA but handle 517 Gr B and F quite frequently. Well the basic steps for good and quality welding are pretty much the same for Q&T steels. However if the NAXTRA grade involved in your design, does not contain, V, Bo or other dangerous alloying elements, then the weldabilty would be better.
Thyssen has a booklet, HS-129, on welding of NAXTRA. Earlier this document was downloadable from their internet technical library. Nowadays I don't think it's downloadable any more. You may get good recommendations for Thyssen as it's one of their product.
Thanks.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Prakash Hegde
Sent: Saturday, October 30, 2010 11:46 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:7953] NAXTRA M700 weldebility
Netra material being high strength material which we have tried with E11016 type elctrode and SAW wire which require to achieve impact at minus 40C and higher UTSatroom room temp (This material is similar to SA517 gr F or similar)
Welding of this material is critical from resulted properties point of view W
Welding parameters are to be estblished with batch testing in 3G position for electrodes with controlled bead length , current, volt to estblish heat input. and also preheating and post heating temp.Some time you may require to have ISR for restrain joint
generaly Kobelco or Thyssen make brand are good which we have used
Regards
Hegde P.B.
From: Dick Overkleeft <dick.overkleeft@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sat, 30 October, 2010 11:21:47 PM
Subject: [MW:7950] NAXTRA M700 weldebility
We are going to use above material fro shipbuilding purpose. Thickness 30- 40 mm. We do not have experience with this specified material, I would like to know from your experience information on ;
Ceq and impactvalue in L and T direction.
In regard to the attached manufacturers information , the deviation in chemical composition may be rather high.
This may require preheating, which influences the weldebility. If you have any practical information, it will be appreciated.
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