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General Duplex stainless steel information
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 duplex 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. Duplex S32205 gives better
guaranteed corrosion resistance, but for much of the Duplex S31803
currently produced also complies with Duplex S32205.2205 is not
generally suitable for use at temperatures above 300º C as it
suffers from precipitation of brittle micro-constituents, nor below
-50º C because of its ductile-to-brittle-transition.
Duplex Applications
Chemical processing, transport and storage,
Oil and Gas exploration and processing equipment,
Marine and other high chloride environments,
Pulp and paper digesters, liquor tanks and paper machines.
Duplex Corrosion Resistance
Excellent general corrosion resistance; Superior to Grade 316 in
most environments. Excellent resistance to localized corrosion
including intergranular, pitting and crevice corrosion; The CPT of
2205 is generally at least 35º C. The grade is also resistant to
chloride stress corrosion cracking (SCC) at temperatures of up to
about 150º C. Grade 2205 will often perform well in environments
which cause premature failure of austenitic grades. It has better
resistance to sea water then Grade 316.
Duplex 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
300º C. If embrittled, this can only be rectified by a full
solution annealing treatment. Duplex stainless steels are almost
never used above 300º C.
Duplex Heat Treatment
Solution treatment (annealing) - heat to 1020º C-1100º C and cool
rapidly. This grade cannot be hardened by thermal treatment, but
does work harden.
| Trade Name | UNS | Duplex Stainless Steel Industry Specifications | Chemical Composition | Min.Tensile (KSI) | Min.Yield (KSI) | Elongation % |
| SAF 2205® 22Cr | UNS S31803 | ASME SA-182 (F51), SA-240, SA-798, SA-790, SA-815 ASTM A182 (F51),A240, A276, A479, A789, A790, A815, A928, A988 SAE J405 | C 0.30 max Cr 21.0-23.0 Mn 2.00 max Mo 2.50-3.50 N 0.08-0.20 Ni 4.50-6.50 P 0.030 max S 0.020 max Si 1.00 max | 90 | 65 | 25 |
| SAF 2205® 22Cr | UNS S32205 | ASME SA-182 (F60), SA-240, SA-798, SA-790, SA-815 ASTM A182 (F60), A240, A276, A479, A480, A798, A790, A815, A928, A988 |
| OD, inch | OD Tolerance inch(mm) | WT Tolerance % | Length Tolernace inch(mm) | |
| + | - | |||
| ≤ 1 / 2 | ± 0.005 ( 0.13 ) | ± 15 | 1 / 8 ( 3.2 ) | 0 |
| > 1 / 2 ~1 1 / 2 | ± 0.005(0.13) | ± 10 | 1 / 8 (3.2) | 0 |
| > 1 1 / 2 ~< 3 1 / 2 | ± 0.010(0.25) | ± 10 | 3 / 16 (4.8) | 0 |
| > 3 1 / 2 ~< 5 1 / 2 | ± 0.015(0.38) | ± 10 | 3 / 16 (4.8) | 0 |
| > 5 1 / 2 ~< 8 | ± 0.030(0.76) | ± 10 | 3 / 16 (4.8) | 0 |
| 8~< 12 | ± 0.040(1.01) | ± 10 | 3 / 16 (4.8) | 0 |
| 12~< 14 | ± 0.050(1.26) | ± 10 | 3 / 16 (4.8) | 0 |
