ASTM A789 S32205 Duplex Stainless Steel Tube for Heat Exchangers
Product Overview
ASTM A789 S32205 duplex stainless steel tube is manufactured from UNS S32205, a nitrogen-enhanced duplex stainless steel commonly known as Duplex 2205. It features a two-phase microstructure consisting of approximately equal proportions of austenite and ferrite.
With its combination of chromium, nickel, molybdenum, and nitrogen, S32205 provides high mechanical strength and good resistance to general corrosion, pitting, crevice corrosion, and chloride-induced stress corrosion cracking.
ASTM A789/A789M covers seamless and welded ferritic/austenitic stainless steel tubing for general service. S32205 is commonly selected for heat exchangers, chemical processing equipment, oil and gas facilities, and other industrial applications requiring a balance of strength and corrosion resistance.
Technical Specifications
| Item |
Description |
| Product Name |
Duplex Stainless Steel Tube |
| Material Grade |
S32205 |
| UNS |
S32205 |
| Common Grade Name |
Duplex 2205 |
| Standard |
ASTM A789/A789M |
| ASME Standard |
ASME SA789/SA789M, when specified |
| Material Type |
Duplex Stainless Steel |
| Product Type |
Seamless or Welded Tubing |
| Manufacturing Process |
According to ordered product type |
| Outer Diameter |
As per customer requirements |
| Wall Thickness |
As per customer requirements |
| Length |
Standard or specified length |
| Heat Treatment |
Solution annealing |
| Surface Finish |
Pickled or as agreed |
| Inspection |
Applicable dimensional, mechanical, and nondestructive tests |
| Documentation |
Material Test Certificate (MTC) |
Chemical Composition of UNS S32205
The chemical composition of S32205 is controlled to provide the alloying balance required for duplex stainless steel performance.
| Element |
Composition (%) |
| Carbon (C) |
≤ 0.030 |
| Manganese (Mn) |
≤ 2.00 |
| Silicon (Si) |
≤ 1.00 |
| Phosphorus (P) |
≤ 0.030 |
| Sulfur (S) |
≤ 0.020 |
| Chromium (Cr) |
22.0–23.0 |
| Nickel (Ni) |
4.5–6.5 |
| Molybdenum (Mo) |
3.0–3.5 |
| Nitrogen (N) |
0.14–0.20 |
Mechanical Properties
Typical minimum mechanical property requirements for S32205 tubing are listed below. Final acceptance criteria must follow the applicable ASTM standard edition and product requirements.
| Property |
Requirement |
| Tensile Strength |
≥ 655 MPa |
| Yield Strength (0.2% Offset) |
≥ 450 MPa |
| Elongation |
≥ 25% |
Applications of S32205 Duplex Stainless Steel Tube
-
Heat Exchangers: Tubing for industrial heat exchange equipment.
-
Chemical Processing: Equipment handling selected corrosive process media.
-
Oil and Gas: Process equipment and piping-related applications requiring corrosion resistance.
-
Marine Engineering: Selected systems exposed to chloride-containing environments.
-
Water Treatment: Equipment and systems handling treated or saline water.
-
Pulp and Paper: Selected process equipment exposed to corrosive chemicals.
The suitability of S32205 depends on temperature, pressure, chloride concentration, chemical composition, and other operating conditions.
ASTM A789 S32205 vs. S31803
S32205 and S31803 are both commonly associated with Duplex 2205. However, their specified chemical composition ranges are not identical.
| Comparison |
S32205 |
S31803 |
| Material Family |
Duplex Stainless Steel |
Duplex Stainless Steel |
| Common Name |
Duplex 2205 |
Duplex 2205 |
| Chromium |
22.0–23.0% |
21.0–23.0% |
| Nickel |
4.5–6.5% |
4.5–6.5% |
| Molybdenum |
3.0–3.5% |
2.5–3.5% |
| Nitrogen |
0.14–0.20% |
0.08–0.20% |
S32205 vs. S32750 Super Duplex Stainless Steel
| Comparison |
S32205 |
S32750 |
| Material Category |
Duplex |
Super Duplex |
| Common Name |
2205 |
2507 |
| Chromium |
22.0–23.0% |
24.0–26.0% |
| Molybdenum |
3.0–3.5% |
3.0–5.0% |
| Nickel |
4.5–6.5% |
6.0–8.0% |
| Nitrogen |
0.14–0.20% |
0.24–0.32% |
| Typical Strength |
High |
Higher |
| Corrosion Resistance |
High |
Generally higher in demanding chloride environments |
Frequently Asked Questions
What is ASTM A789 S32205?
ASTM A789 S32205 is a duplex stainless steel tubing specification using UNS S32205 material. It is commonly known as Duplex 2205 and is used in general-service tubing applications.
Is S32205 the same as Duplex 2205?
S32205 is a UNS designation commonly associated with Duplex 2205. S31803 is another designation associated with 2205, but its chemical composition limits differ from S32205.
What is the difference between ASTM A789 and ASTM A790?
ASTM A789/A789M covers seamless and welded ferritic/austenitic stainless steel tubing for general service. ASTM A790/A790M covers seamless and welded ferritic/austenitic stainless steel pipe. The correct specification depends on the product form and intended application.
Is S32205 suitable for seawater applications?
S32205 offers better resistance to localized corrosion than many conventional austenitic stainless steels. However, its suitability for seawater service depends on temperature, chloride concentration, flow conditions, deposits, and crevice conditions.
Is S32205 stronger than 316L?
Yes. S32205 generally has a higher minimum yield strength than 316L. It also offers improved resistance to chloride-induced stress corrosion cracking and localized corrosion in many environments.
What documents are available?
Depending on the order and supplier capabilities, documentation may include a material test certificate, chemical analysis, mechanical test results, dimensional inspection records, and applicable nondestructive examination reports.
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