Electric Welded Pipe Duplex

2205 is a duplex (austenitic-ferritic) stainless steel containing about 40 - 50% ferrite in the annealed condition. 2205 has been a practical solution to chloride stress corrosion cracking problems experienced with 304/304L or 316/316L stainless. The high chromium, molybdenum and nitrogen contents provide corrosion resistance superior to 316/316L and 317L stainless in most environments. 2205 is not suggested for operating temperatures above 600°F.

The design strength of 2205 Electric Welded Pipe Duplex is significantly higher than 316/316L, often permitting lighter wall construction. 2205 has good notch impact toughness down to temperatures below - 40°F. 2205 is welded with E2209 or ER2209 fillers.

Chemistry

 NiCrMoMnSiCNSPFe

Electric Welded Pipe Duplex Specifications

ASME SA 182, ASME SA 240, ASME SA 479, ASME SA 789, ASME SA 789 Section IV Code Case 2603
ASTM A 240, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 479, ASTM A 790
NACE MR0175/ISO 15156, NORSOK MDS D45 Grade F51, UNS S31803
UNS S32205
W. NR./EN 1.4462

Common Trade Names

2205 Stainless, Duplex 2205

Features

• High resistance to chloride stress corrosion cracking

• Chloride pitting and crevice corrosion resistance superior to 317L stainless

• Good general corrosion resistance

• High strength

• Good sulfide stress corrosion resistance

• Useful up to 600°F

Applications

• Chemical process vessels, piping, and heat exchangers

• FGD scrubber systems

• Pulp mill digesters, bleach washers, chip presteaming vessels

• Food process equipment

• Oil field piping, heat exchangers




Temperature, °F	70	212	392	572
Coefficient* of Thermal Expansion, in/in°F x 10-6	-	8	8	8
Thermal Conductivity Btu • ft/ft2 • hr • °F	8	9	10	11
Modulus of Elasticity, Dynamic psi x 106	28	26	25	24

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASTM A 240

Ultimate Tensile Strength, ksi	95
0.2% Yield Strength, ksi	65
Elongation, %	25
Hardness MAX, Brinell	290


Minimum Elevated Tensile Properties, Plate

Temperature, °F	212	302	392	482
Ultimate Tensile Strength, ksi	86	83	80	78
0.2% Yield Strength, ksi	52	49	46	44

Corrosion Resistance

	PREn	Critical Pitting Temperature, CPT
2205	34	130°F
316L	24	62°F

PREN = %Cr + 3.3 %Mo + 16 %N CPT; ASTM G150 (5.8% NaCl)