Both of the above grades are well accepted in oil and gas, refining , petrochemicals industry. It's subjective decision based on cost, application, weldability and other factors. Both alloys have good weldability.
UNS 32760 is inherently prone to more intermetallic formation that UNS 32750 (SDSS 2507), due to presence of "W", hence may have restrictions with respect to maximum design temperature.
However selection is justifiable based on, design conditions vs. service experience. See the link below for general guidelines.
What's the intended service, design parameters, process fluid handled? What're the metallurgical testing requirements of your clients' specifications? Appreciate your response.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Harikrishnan N S
Sent: Sunday, February 01, 2015 10:08 PM
To: materials-welding@googlegroups.com
Cc: r.bathula@ticb.com
Subject: [MW:22787] Re: Super duplex SS: UNS S32750 Vs S32760
Hi Experts
I recently came across a client spec which restricts the use of UNS S32760 SDSS.
From the chemical composition, UNS S32760 has better corrosion resistance due to Cu and W additions.
Hence per corrosion point of view, S32760 is better than S32750. But is there any deleterious effects for Cu and W additions while welding. How is the weldability of S32760 compared to S32750?
Thanks and Regards
Harikrishnan
On Thursday, April 9, 2009 at 6:16:59 PM UTC+8, Bathula Raghuram (Mumbai - PIPING) wrote:
I could not find any reference from major manufacturer like Sandvik, Avesta on S32760 grade.
Can any body give inputs on S32760 in terms of weldability? Which one is better in terms of weldability?
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