Duplex 2205 Tube

1. Standard: ASTM A789, ASTM A790, ASME SA789, ASTM SA790
2. Seamless Tube Size: 1/4” – 1” OD
3. Welded Tube Size: 6.35 mm OD To 152 mm OD
4. Length: Single, Double Random & Cut Length
5. Processing：Cold Worked and Bright Annealed

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Product Introduction

Duplex 2205 Tube is an (austenitic-ferritic) stainless steel containing approximately 40 – 50% ferrite in the annealed condition. 2205's high chromium, molybdenum, and nitrogen content make it more resistant to chloride stress corrosion cracking than 304/304L or 316/316L stainless steels. 2205 is designed to be significantly stronger than 316/316L, more than twice the strength of conventional austenitic stainless steels, thus generally allowing for lighter wall constructions. Alloy 2205 is often referred to as 22-Chromium, with the common designations UNS S31803 or S32205.

2205 Duplex Stainless Steel Tube Applications：

Oil & Gas
Chemical Processing
Desalination
Heat Exchangers
High Chloride Environments

2205 Stainless Tube Specifications

Specifications	ASTM A789 / ASME SA 789
Standard	DIN, JIS, ASTM, EN, GB, AISI, ASME
Thickness	0.3mm - 50 mm
Seamless Tube Size	3.35 mm OD To 101.6 mm OD, 15 NB to 150 NB IN
Welded Tube Size	6.35 mm OD To 152 mm OD
Tube End	Plain End, Beveled End, Treaded Pipe.
Grade	TP304,TP304L,TP316,TP316L,316Ti TP317,TP317L,TP321,TP310S,TP347,S31254,N08367,N08926,N08904, S31803, S32205, S32750

Difference Between Duplex 2205 Tube and Duplex 2205 Pipe

In general, tube is more expensive than pipe. The manufacturing process for tube, especially seamless tube, involves additional steps and greater precision, which contributes to its higher cost. Pipes, especially welded pipes, are usually more cost-effective.

2205 Duplex Stainless Steel Tubing Balanced

The phase balance of ferrite/austenite in the metallographic structure can be predicted by multivariate linear regression as follows:

Creq = %Cr + 1.73 %Si + 0.88 %Mo
Nieq = %Ni + 24.55 %C + 21.75 %N + 0.4 %Cu
%Ferrite = -20.93 + 4.01 Creq - 5.6 Nieq + 0.016 T

T (℃) is the annealing temperature, 1050-1150℃, and the element content is weight percentage (wt%). By adjusting the content of chromium, molybdenum, nickel, and nitrogen and controlling the heating operation, the desired phase balance can be obtained, that is, the proportion of ferrite phase is 45-50%, and the rest is austenite phase.