ASTM A789 UNS S32205 Duplex Steel Tube 450MPa Yield Cl⁻ Resistant for Heat Exchanger
Price:
NEGOTIABLE
MOQ:
500KGS
Delivery Time:
10-90 Days
Brand:
YUHONG
Product Description
ASTM A789 UNS S32205 Duplex Steel Tube 450MPa Yield Cl⁻ Resistant for Heat Exchanger
ASTM A789 / ASME SA789 are standard specifications for seamless and weldable ferritic/austenitic duplex stainless steel tubes, suitable for heat exchangers, condensers, and general corrosive applications. UNS S32205 is the most widely used grade of duplex stainless steel, characterized by its unique two-phase microstructure, with approximately 50% ferrite and 50% austenite, combining the good toughness of austenitic stainless steel with the high strength and stress corrosion resistance of ferritic stainless steel.
ASTM A789 and UNS S32205 duplex stainless steel tubes are "mainstay" duplex stainless steel tubing solutions designed for chloride-containing environments, acidic media, and high-strength applications. They have approximately twice the yield strength of 316L, significantly better pitting resistance than austenitic stainless steel, and are inherently immune to chloride stress corrosion cracking.
Duplex stainless steel UNS32205 is the top choice for cost-effectiveness in high-sulfur, chlorine-containing corrosion-prone areas.
It is suitable for high-pressure air-cooled tubing in hydrogenation processes, air-cooling of pre-hydrogenated products, and acidic condensation lines containing NH₄HS.
| Chemical Composition – UNS S32205 vs UNS S31803 | ||
| Element | S32205 Range (%) | S31803 Range (%) |
| C (Carbon) | ≤ 0.03 | ≤ 0.03 |
| Mn (Manganese) | ≤ 2.00 | ≤ 2.00 |
| Si (Silicon) | ≤ 1.00 | ≤ 1.00 |
| P (Phosphorus) | ≤ 0.03 | ≤ 0.03 |
| S (Sulfur) | ≤ 0.02 | ≤ 0.02 |
| Cr (Chromium) | 22.0 – 23.0 | 21.0 – 23.0 |
| Ni (Nickel) | 4.5 – 6.5 | 4.5 – 6.5 |
| Mo (Molybdenum) | 3.0 – 3.5 | 2.5 – 3.5 |
| N (Nitrogen) | 0.14 – 0.20 | 0.08 – 0.20 |
| Cu (Copper) | — |
≤ 1.0 (optional) |
| Mechanical Properties – Standard Minimum vs. Typical Values | ||
| Property | ASTM A789 Requirement (Min.) | Typical Value |
| Tensile Strength (Rm) | ≥ 655 MPa (95 ksi) | 825 – 1035 MPa |
| Yield Strength (Rp0.2) | ≥ 450 MPa (65 ksi) | ~550 – 620 MPa |
| Elongation (50mm gage length) | ≥ 25% | 30 – 35% |
| Hardness | ≤ 293 HBW / ≤ 32 HRC | ~19 HRC |
| Physical Properties | ||
| Property | Value | Unit |
| Density | 7.82 – 7.85 | g/cm³ |
| Elastic Modulus (20°C) | 190 – 200 | GPa |
| Thermal Conductivity (100°C) | ~19 | W/(m·K) |
| Coefficient of Linear Expansion (0-100°C) | 13.7 | ×10⁻⁶/°C |
| Electrical Resistivity | ~850 | nΩ·m |
| Melting Range | 1400 – 1455 | °C |
| Heat Treatment Requirements | |
| Item | Requirement |
| Solution Annealing Temperature | 1020°C – 1100°C |
| Cooling Method | Rapid cooling (water quench or rapid air cool) |
| Hardening Method | Cannot be hardened by heat treatment |
| Work Hardening | Cold working produces significant hardening |
Application
- Oil and Gas Industry: Oil and gas extraction and transportation equipment, offshore platform pipelines, pipelines for acidic environments
- Chemical Processing: Chemical processing equipment, transportation and storage containers
- Marine Engineering: Seawater cooling systems, pipelines for high-chlorine environments
- Paper Industry: Pulp digesters, filtrate tanks, paper machine components
- Heat Exchangers: Heat exchanger tube bundles for oil refining, chemical, and power industries
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Company
Yuhong Group Co.,Ltd
Location
20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA
Contact Person
Jikin Cai