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Eternal
In coastal factories, seawater cooling units, offshore oil platforms, and high-salt industrial cooling equipment, the choice of material for heat exchanger tube sheets is critical to safe operation and long service life.
316L stainless steel is very easy to get pitting corrosion and stress corrosion cracking (SCC) in chloride environments.
2205 duplex stainless steel (UNS S32205/S31803) forged tube sheets, with their dual-phase structure (about 50% austenite + 50% ferrite), offer high strength and excellent resistance to chloride corrosion. They are an ideal replacement for traditional austenitic stainless steels.
Jiangyin Eternal Heavy Industry Co., Ltd. has focused on improving stainless steel forging technology and has made important progress in the forging process of 2205 duplex stainless steel (UNS S32205/S31803) forged tube sheets.
Standard | Grade |
China（GB/T ） | F51/022Cr22Ni5Mo3N |
Germany（DIN） | 1.4462 |
Europe（EN） | X2CrNiMoN22-5-3 |
Japan（JIS） | SUS 329J3L |
Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
（wt%） | ≤ 0.030 | ≤1.00 | ≤2.00 | ≤0.030 | ≤ 0.015 - 0.020 | 21.00~23.00 | 4.50~6.50 | 2.50~3.50 | 0.14 – 0.20 |
Item | 2205 required value | Value |  |
Tensile Strength Rm（MPa） | ≥620 | 620~875 | |
Specify Non-Proportional Elongation Strength Rₚ₀.₂（MPa） | ≥450 | 450~500 | |
Elongation at break A（%） | ≥25 | ≥25 | |
Hardness HBW | ≤290 | ≤290 |
We always focus on customers, pay attention to their needs, provide high-quality products and excellent services to meet their expectations.
Melting:
Electric furnace + secondary refining (AOD/VOD) or electroslag remelting (ESR) to ensure clean molten steel and uniform composition.
Forging:
Multi-directional forging process, main section forging ratio ≥ 3, continuous and dense metal flow lines, eliminating defects such as shrinkage cavities and porosity.
Heat Treatment:
Solution treatment (S) per ASTM A182 at 1010–1150°C with rapid cooling to fully dissolve carbides, ensuring the best resistance to intergranular corrosion.
Too high a temperature may cause grain coarsening, but optimized chemistry (e.g., micro‑nitrogen addition) effectively controls abnormal grain growth, maintaining a good balance of toughness and strength.
Machining:
Surface machined to meet NDT requirements and tube hole precision. Surface roughness is suitable for strength‑expansion tube joints or seal‑welding processes.
Quality is assured through rigorous inspection at every stage of production
According to DIN EN 10228-3, Quality Class 3.
According to DIN 1690, Part 2, Acceptance Level 2.
According to ASTM E112 ≥5
According to ASTM A262 Practice E
Application | Condition |
Marine Engineering | Seawater cooling heat exchangers, process pipelines for offshore platforms, subsea manifold flanges, ballast water treatment systems. |
Coastal industrial sector | Coastal refining and petrochemical plants, condensers in thermal power plants, heat exchange components for desulfurization systems (FGD) |
High-salt industrial liquid cooling | Liquid cooling systems for data centers, high-concentration saltwater evaporation devices, and marine cooling equipment for chemicals. |
Acidic oil and gas field | Acidic oil and gas fields' H₂S/CO₂-containing oil and gas processing equipment and wellhead valve forgings (in compliance with NACE MR0175 standards). |
