Detailed Product Description
Duplex Stainless Steel
UNS S31803 - UNS S32205
Duplex Plate/Sheet
Duplex Seamless & Welded Tube
Duplex Seamless & Welded Pipe
Duplex Round Bar
Duplex Flanges F51
Duplex Specialty Forgings
Duplex Seamless & Welded BW Fittings


UNS S31803
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

S32205:
C 0.30 max Cr 22.0-23.0 Mn 2.00 max Mo 3.00-3.50
N 0.14-0.20 Ni 4.50-6.50 P 0.030 max S 0.020 max Si 1.00 max

Product picture: 



Description:

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.

Classification Society Criterion: CSS, DNV, GL, LR, NK, KR, ABS, BV
.
Standard Specification:
ASTM A213 / A213M - 11a: Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A269 - 10: Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service
ASTM A312 / A312M - 12: Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
ASTM A511 / A511M - 12: Standard Specification for Seamless Stainless Steel Mechanical Tubing
ASTM A789 / A789M - 10a: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
ASTM A790 / A790M - 11: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe

Material Grade:

Austenitic Steel:
TP304, TP304L, TP304H, TP304N, TP310S, TP316, TP316L, TP316Ti, TP316H, TP317, TP317L, TP321, TP321H, TP347, TP347H, 904L
Duplex Steel:
S32101, S32205, S31803, S32304, S32750, S32760
Others: TP405, TP409, TP410, TP430, TP439, ...


SIZE: OD 6-810MM; TK 0.5-42MM; LENGTH AS REQUIRED