Corrosion Resistance ASTM A790 2205 Duplex Stainless Steel Pipes

01) Type: 2205 Duplex Stainless Steel Pipes
02) Process method: Hot rolled/ cold rolled/ cold drawn
03) Surface finish: Annealed/pickling,mirror,HL
04) Standards: AISI,ASTM,A790, etc
05) Material: UNS S32205, 2205, etc
06) Size:
A) O. D.: 6mm - 710mm
B) Thickness: 2.5mm - 50mm
07) Length: Max. 17 meters (specific or random)
08) Delivery conditions: Annealed, pickled & polished

Grade 2205 Duplex (UNS S32205/S31803)

Duplex 2205 is the most widely used duplex (ferritic/austenitic) stainless steel grade. It finds applications due to both excellent corrosion resistance and high strength.

The standard S31803 composition has over the years been refined by many steel suppliers, and the resulting restricted composition range was endorsed as UNS S32205 in 1996. S32205 gives better guaranteed corrosion resistance, but much of the S31803 currently produced also complies with S32205.

2205 is not generally suitable for use at temperatures above 300°C as it suffers from precipitation of brittle micro-constituents, nor below -50°C because of its ductile-to-brittle-transition.

Chemical Composition, %

Applications of Duplex 2205

Chemical process vessels, piping and heat exchangers

Pulp mill digesters, bleach washers, chip pre-steaming vessels

Food processing equipment

Oil field piping and heat exchangers

Flue gas desulfurization equipment

Corronsion Resistance

Excellent general corrosion resistance; superior to Grade 316 in most environments. Excellent resistance to localised corrosion including intergranular, pitting and crevice corrosion; the CPT of 2205 is generally at least 35°C. The grade is also resistant to chloride stress corrosion cracking (SCC) at temperatures of up to about 150°C. Grade 2205 will often perform well in environments which cause premature failure of austenitic grades. It has better resistance to sea water than grade 316.

Heat Resistance

Although 2205 has good high temperature oxidation resistance this grade, like other duplex stainless steels, suffers from embrittlement if held for even short times at temperatures above 300°C. If embrittled this can only be rectified by a full solution annealing treatment. Duplex stainless steels are almost never used above 300°C.

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