General characteristics
Consumables for 25% Superduplex stainless steels providing high resistance to pitting and stress corrosion cracking in seawater.
The nominal composition (wt. %) of this classification is 25.5 Cr, 9.2 Ni, 3.5 Mo, 0.25 N. The sum of the Cr + 3.3(Mo + 0.5 W) + 16 N, known as the Pitting Resistance Equivalent Number (PREN), is at least 40, thereby allowing the weld metal to be called a “superduplex stainless steel.” This number is a semi-quantitative indicator of resistance to pitting in aqueous chloride-containing environments. It is designed for the welding of superduplex stainless steels UNS S32750 and 32760 (wrought), and UNS J93380, and J93404 (cast). It can also be used for the welding of UNS S32550, J93370, and J93372 when not subject to sulfurous or sulfuric acids in service. It can also be used for the welding of carbon and low alloy steels to duplex stainless steels as well as to weld “standard” duplex stainless steel such as UNS S32205 and J92205 especially for root runs in pipe.

Products of the line 2507

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