Views: 29 Author: Shirley Publish Time: 2025-07-07 Origin: Site
Duplex 2205 stainless steel is composed of ferrite and austenite, so it is called "duplex". The strength of duplex steel is about twice that of austenitic and ferritic stainless steel. Despite their high strength, duplex 2205 steel shows good plasticity and toughness.
Duplex 2205 offers significantly better toughness and ductility than ferritic stainless and carbon steels, even at low temperatures. JN Duplex Steel 2205 products are as follows:
UNS S31803, S32205, F51, F60
ASTM A 182, A 240, A 276, A 479, A 789, A 790, A 815
ASME SA 182, SA 240, SA 479, SA 789
Norsok MDS D45 Grade F51, EN 1.4462
NACE MR0175
In most environments, duplex 2205 stainless steel has high corrosion resistance. The alloy has a high chromium content for resistance to oxidizing acids. It also contains sufficient molybdenum and nickel to resist reducing acids. Duplex 2205 composition form:
Duplex 2205 Composition (%) | C | Si | Mn | P | S | Cr | Ni | Mo | N |
Standard | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.04 | ≤0.03 | 21.0~24.0 | 4.5~6.5 | 2.5~3.5 | 0.08~0.2 |
Normal | 0.025 | 0.6 | 1.5 | 0.026 | 0.001 | 22.5 | 5.8 | 3.0 | 0.16 |
2205's high chromium, molybdenum and nitrogen make it very resistant to chloride pitting and crevice corrosion. Their corrosion resistance varies from that of 316 stainless steel up to the level of SAF 2507.
Duplex stainless steels are a austenitic-ferritic family of grades, not a single grade. They are standardized globally using systems like UNS and EN designations. Here's the main categories and grades:
Standard/Low-Alloy Duplex Steel: Alloy 316L alternative with better strength and chloride resistance, more cost-effecitive.
UNS S32205 / EN 1.4462 / Duplex F60 / 2205
UNS S31803 / EN 1.4462 / Duplex F51 / 2205
Lean Duplex Steel: Reduced nickel/molybdenum for lower cost, while maintaining strength.
UNS S32101 / EN 1.4162
UNS S32304 / EN 1.4362
UNS S32003 / EN 1.4482
Super Duplex Steel: Extreme corrosion resistance and high strength for aggressive environments. JN 2507 Super Duplex Steel are grades for seawater heat exchangers, offshore oil and gas.
UNS S32750 / EN 1.4410 / F53 / 2507
UNS S32760 / EN 1.4501 / F55 / 2507
UNS S32550 / EN 1.4507
JN is a leading Duplex 2205 and Super Duplex 2507 manufacturer and supplier in China, we have a professional sales team to help you order high quality, factory price duplex stainless steel.
2205 Chemical Composition
| C | Mn | Si | P | S | Cr | Mo | Ni | N | |
|---|---|---|---|---|---|---|---|---|---|
| 2205 (S31803) | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 21.0 max: 23.0 | min: 2.5 max: 3.5 | min: 4.5 max: 6.5 | min: 0.08 max: 0.20 |
| 2205 (S32205) | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 22.0 max: 23.0 | min: 3.0 max: 3.5 | min: 4.5 max: 6.5 | min: 0.14 max: 0.20 |
2205 Mechianical Properties
| Yield Strength | Tensile Strength | Elongation | − | − |
| Ys (Mpa) | Ts (Mpa) | El (%) | Hv | 2.0t/2B |
| ≥ 450 | ≥ 620 | ≥ 25% | ≥ 18 | ≤ 320 |
| 500 | 670 | 35% | 27 | 280 |
Steel Type | Product | Tensile Strength | Yield Strength | Elongation |
MPa | MPa | % | ||
00Cr22Ni5Mo3N | Φ20mm,Bars | ≥680 | ≥450 | ≥25 |
SAF 2205 | Wall Thickness ≤20mm，Pipes | 680/880 | >450 | >25 |
Steel Type | Product | Tensile Strength | Yield Strength | Elongation | Temperature |
MPa | MPa | % | ℃ | ||
00Cr22Ni5Mo3NSAF 2205 | Φ20mm,Bars | 710 | 470 | 37 | 100 |
680 | 393 | 32 | 200 | ||
650 | 380 | 30 | 300 | ||
Wall Thickness ≤20mm, Pipes | >630 | >370 | − | 100 | |
>580 | >330 | − | 200 | ||
>560 | >310 | − | 300 | ||
≤200mm, Forgings | >630 | >365 | − | 100 | |
>580 | >315 | − | 200 | ||
>560 | >285 | − | 300 |
2205 Physical Properties
| Density (g/cm3) | Magnetic Properties | Specific Heat (J/g.℃) | Thermal Conductivity 100 ℃ (W/m） | Thermal Expansion 20~100 ℃ (10/C) |
7.8 | Yes | 0.45 | 19.0 | 13.7 |
Hot Forming
During hot forming, the entire workpiece should be heated as a whole, and carried out between 1750°F and 2250°F. 2205 stainless is very soft at this temperature. If the temperature is too high, 2205 stainless is prone to hot tearing.
If it is lower than this temperature, the austenite will fracture. After hot forming, immediately solution anneal at 1900°F minimum and quench. This restores phase balance, toughness, and corrosion resistance.
Cold Forming
2205 Duplex Steel can be cut and cold formed. Due to its high strength and hardness, 2205 requires more cold forming than austenitic steels and necessitates springback consideration.
Heat Treatment
2205 stainless should be annealed at a temperature of 1900°F minimum, then rapidly cooled and water quenched. Processing below 1900°F can cause the precipitation of harmful metal or non-metal phases.
Machinability
On high-speed machine tools, the cutting speed of duplex 2205 stainless is the same as that of 316L. If a carburized knife is used, the cutting speed is reduced by about 20% compared to 316L.
Welding
The weldability of duplex steel 2205 stainless is very good. To prevent the precipitation of harmful phases, welding 2205 stainless steel requires a procedure that maintains its phase balance.
JN is a leading Duplex 2205 manufacturer and supplier in China, we have a professional sales team to help you order high quality, factory price 2205 Duplex Stainless Steel.
The difference between duplex 2205 stainless steel and austenitic 304 stainless steel plate.
It has enough plastic toughness and a yield strength that is more than double that of 304. Duplex stainless steel storage tanks and pressure vessels have walls that are 30–50% thinner than those of austenite, which is more cost-effective.
It has outstanding resistance to cracking and corrosion. Duplex stainless steel resists chloride stress corrosion cracking better than austenitic grades, even the leanest alloys.
Super duplex stainless steel offers exceptionally high corrosion resistance, while 2205 duplex stainless steel provides significantly better corrosion resistance than 316L austenitic stainless steel. It can even replace high-alloy austenitic stainless steels in certain media such as acetic acid and formic acid.
It resists local rusting well. Its resistance to fatigue corrosion and wear corrosion exceeds that of austenitic stainless steels with comparable alloy content.
Its linear expansion coefficient is closer to carbon steel than to austenitic stainless steel, suggesting a likely connection.
2205 stainless steel absorbs more energy than austenitic grades, helping structures withstand sudden events like impacts and explosions. Duplex stainless steel offers clear benefits and usefulness in real-world applications.
Oil and gas sector: Because of its exceptional strength and resistance to corrosion, 2205 SS is frequently utilized in oil well equipment, pipelines, and valves.
Chemical processing: Reactors, storage tanks, and pipes are made of SS 2205 duplex stainless steel for use in chemical processing equipment. Its duplex structure effectively prevents pitting and crevice corrosion, allowing it to function well in situations with strong acids.
Aerospace: 2205 stainless steel is widely used in engine and structural parts.
Transportation and shipbuilding: 2205 duplex stainless steel is used in shipbuilding for hulls and other seawater-exposed components.
Environmental protection equipment: 2205 duplex stainless steel is also widely used in environmental protection equipment, such as wastewater treatment systems and gas desulfurization devices. Its corrosion fatigue resistance and stress corrosion resistance make it excellent in handling corrosive waste.
In short, 2205 duplex steel has many excellent properties and is a high-performance, multi-purpose stainless steel material. For any inquiries about 2205 stainless steel, pricing, or purchases, please contact us.
JN is a leading Duplex 2205 manufacturer and supplier in China, we have a professional sales team to help you order high quality, factory price 2205 Duplex Stainless Steel.
Q: Can you weld 2205 to 316 stainless steel?
A: Yes, you can weld them together, but always use ER2209 filler metal. Regular 316 filler won’t work well because 2205 is stronger and more corrosion-resistant. The ER2209 filler creates a strong joint that balances both materials. Never weld them without filler metal – this makes weak spots and causes rust.
Q: How to weld 2205 duplex stainless steel?
A: When welding 2205 stainless steel, use low temperatures andcontrol the temperature well. First, weld quickly, let the metal cool below 150°C between passes.
Always use pure argon gas to protect the weld area. After welding, clean off any dark colors with special acid paste. Only use ER2209 filler metal for strong, corrosion-resistant welds.
Q: Is 2205 duplex stainless steel magnetic?
A: Yes, 2205 duplex stainless steel is partly magnetic. This happens because it’s made of two types of structures mixed together. The magnetism is normal and doesn’t mean the steel is low quality or will rust easily. It still works well in seawater and chemicals.
