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S31803/2205 Duplex Stainless Steel Tube Seamless 19.05x1.2mm For Heat Exchanger

Categories Duplex Stainless Steel Tube
Brand Name: SPEZILLA
Model Number: Seamless Tube
Certification: ISO9001:2008, PED 97/23/EC
Place of Origin: CHINA
MOQ: Negotiation
Price: Negotiation
Payment Terms: T/T or L/C
Supply Ability: 1000 TONS / MONTH
Delivery Time: 25 DAYS
Materials: S31803/2205
Product Name: Duplex Stainless Steel Tube
Standard: ASME SA789
O.D.: 5/8"-2"
W.T.: BWG18-BWG14
Length MAX: 12000MM Max.
Pipe Finish: TIG Welded
Type: Welded
Shape: Round
Surface: Bright Annealed
Application: Heat exchanger
Package: Wooden case
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S31803/2205 Duplex Stainless Steel Tube Seamless 19.05x1.2mm For Heat Exchanger

ASTM A789 Duplex Stainless Steel S31803/2205 Seamless Tubing 19.05x1.2mm

Duplex 2205 stainless steel (both ferritic and austenitic) is used extensively in applications that require good corrosion resistance and strength. The S31803 grade stainless steel has undergone a number of modifications resulting in UNS S32205, and was endorsed in the year 1996. This grade offers higher resistance to corrosion.

At temperatures above 300°C, the brittle micro-constituents of this grade undergo precipitation, and at temperatures below -50°C the micro-constituents undergo ductile-to-brittle transition; hence this grade of stainless steel is not suitable for use at these temperatures.

The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).

Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F. Extended elevated temperature exposure can embrittle 2205 stainless.

2205 Stainless Steel is far superior to standard marine grade 316 and 316L.

2205 Stainless Steel has been developed over the last 10-20 years by metallurgists that required a stainless that was not only stronger than standard marine grade 316, but offered much better corrosion resistance. (2205 is commonly used for marine propeller shafts.)

2205 Stainless achieves almost twice the corrosion resistance to ordinary 316. This is due to added levels of Nickel, Chromium, Molybdenum and Nitrogen.


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

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
SAE J405

Specifications of Duplex Stainless Steel Welded Tube

1. Standard: ASTM ASME
2. Grade: 630 / 631 / 2205 / 2507 / 17-4PH
ASTM A789, ASTM A790, ASTM A450, ASTM A530,
GB/T 14976, GB/T 14975, GB/T 13296, etc
3. OD: 8mm-1000mm
4. Wall thickness: 0.3mm-30mm
5. Length: max.18000mm or as demand

6. Surface finish: Polishing (180#,220#,240#,320#400#,600#), Hairline, acid pickled, etc.


  • 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


  • 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


Specifications (ASTM/ASME) Duplex Stainless Steel Pipe
AlloyUNS DesignationMaterial
2205S31803/S32205A 240/SA-240A 270A 790/SA-790
A 789/SA-789A928/SA928

Chemical Compositions:

Chemical Composition (%) Duplex Stainless Steel Pipe
UNS DesignationS31803S32205
Carbon (C) max.0.0300.030
Manganese (Mn) max.2.002.00
Phosphorus (P) max.0.0300.030
Sulfur (S) max.0.0200.020
Silicon (Si) max.1.001.00
Chromium (Cr)21.0 - 23.022.0 - 23.0
Nickel (Ni)4.5 - 6.54.5 - 6.5
Molybdenum (Mo)2.5 - 3.53.0 - 3.5
Nitrogen (N)0.08 - 0.200.14 - 0.20
Iron (Fe)BalanceBalance

Steel grade45% MgCl at 155oC40% CaCl2 at 100oC40% CaCl2 at 100oC, 0.9 x Rp0.225% NaCl, pH 1.5, 106oC25% NaCl, 106oC1500 ppm Cl- at 100oC
2201ProbableNot probableNot probableNot probableNot probableNot probable
2304ProbableNot probableNot probableNot probableNot probableNot probable
2404ProbablePossibleNot probableNot probableNot probableNot probable
2205ProbableNot probableNot probableNot probableNot probablePossible
2507ProbableNot probableNot probableNot probableNot probableNot probable
254 SMOProbableNot probableNot probableNot probableNot probableNot probable

Quality S31803/2205 Duplex Stainless Steel Tube Seamless 19.05x1.2mm For Heat Exchanger for sale
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