2205 vs 316L Stainless Steel
Side-by-side comparison · Composition · Properties · Selection guide
Duplex 2205 has substantially higher specified yield strength than annealed 316L and, with 22% chromium plus nitrogen, provides greater resistance to chloride pitting and stress-corrosion cracking. 316L counters with easier forming and welding, cryogenic toughness, and generally broader availability in common product forms and finishes.
Full datasheets:2205 Stainless Steel·316L Stainless Steel
At a Glance
| 2205 | 316L | |
|---|---|---|
| Type | Duplex (austenitic-ferritic) | Austenitic (low carbon, Mo-bearing) |
| UNS | S32205 | S31603 |
| Standard | ASTM A240/A240M, A276 | ASTM A240/A240M |
| Density | 7.8 g/cm³ | 7.98 g/cm³ |
Corrosion Resistance and Service Limits
2205
- The mixed austenitic-ferritic structure provides high strength and improved resistance to chloride pitting and stress-corrosion cracking relative to 304/316-type grades.
- PREN is only a screening index. Temperature, crevices, weld phase balance, heat tint, deposits and actual solution chemistry still govern suitability.
316L
- General corrosion resistance comes from the chromium-rich passive film; nickel, molybdenum, nitrogen and copper change performance by grade.
- Check chlorides, temperature, crevices, deposits, process chemistry and cleaning conditions. A grade designation alone is not a service-life guarantee.
Fabrication and Heat Treatment
| Operation | 2205 | 316L |
|---|---|---|
| Welding | Use a qualified duplex procedure with controlled heat input, interpass temperature and filler to maintain phase balance, toughness and corrosion resistance. | Generally weldable with a qualified procedure and matching or over-alloyed filler where required; remove heat tint when corrosion service demands it. |
| Forming | Higher yield strength increases forming load and springback. Severe cold work may require solution annealing under a qualified route. | Good ductility is typical, but rapid work hardening increases forming load and springback; bend radius and intermediate annealing depend on grade and reduction. |
| Machining | Use rigid equipment, positive feeds and lower cutting speed than common austenitic grades because high strength and work hardening raise cutting load. | Use rigid tooling, positive feeds and controlled heat because the material work-hardens; free-machining grades require separate corrosion and welding review. |
| Heat treatment | Solution anneal and rapid cooling are used to restore the specified duplex structure. Local stress relief can form harmful intermetallic phases and is not a generic remedy. | Solution annealing and rapid cooling restore the intended condition where applicable. Austenitic grades are not hardened by conventional quench-and-temper treatment. |
Chemical Composition (wt%)
| Element | 2205 | 316L |
|---|---|---|
| C | ≤0.030 | ≤0.030 |
| Mn | ≤2.00 | ≤2.00 |
| Si | ≤1.00 | ≤0.75 |
| Cr | 22.0–23.0 | 16.0–18.0 |
| Ni | 4.5–6.5 | 10.0–14.0 |
| Mo | 3.0–3.5 | 2.00–3.00 |
| N | 0.14–0.20 | — |
| P | ≤0.030 | ≤0.045 |
| S | ≤0.020 | ≤0.030 |
Mechanical Properties
| Property | 2205 | 316L |
|---|---|---|
| Tensile strength | ≥655 MPa (95 ksi) | ≥485 MPa (70 ksi) |
| Yield strength (0.2%) | ≥450 MPa (65 ksi) | ≥170 MPa (25 ksi) |
| Elongation (50 mm) | ≥25% | ≥40% |
| PREN | ≥34 | — |
| Hardness | — | ≤217 HBW |
Which One Should You Choose?
Choose 2205 for:
- Chloride-bearing process streams, brines and seawater-adjacent duty
- Weight-critical structures — thinner walls at equal pressure rating
- Hot-water or steam systems where 316L has cracked (SCC)
- Tanks, pressure vessels and structural members
Choose 316L for:
- Cryogenic and sub −50 °C service
- Deep drawing, tight bending and complex fabrication
- Sanitary, pharmaceutical and high-polish applications
- Small-lot buying where duplex stock sizes are scarce
Our verdict
Price per ton is similar in many markets — duplex saves nickel and molybdenum but costs more to fabricate. The real economics: 2205's double strength lets designers cut wall thickness 30–40%, so on tanks and vessels the duplex option is often cheaper installed. For polished, formed or cold-service equipment, stay with 316L.
Cost and Availability
Compare the current stock position, mill route, minimum production quantity, processing yield, testing and delivered cost for 2205 and 316L at quotation time. A fixed price ratio would be misleading because product form, size, condition and market timing can change the commercial result.
Do Not Substitute Without Review
Do not replace 2205 with 316L, or the reverse, from the grade name alone. Recheck chemistry, mechanical-property condition, product standard, dimensions, corrosion environment, welding procedure and project approval before substitution.
2205 & 316L Products We Export
2205 Duplex Stainless Steel Round Bar
Duplex 2205 (S32205) round bar, in quotation-confirmed dimensions, solution annealed — double the yield strength of 316L with high chloride resistance, for marine and chemical duty.
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316L Stainless Steel Sheet
316/316L stainless steel sheet for marine and chemical service, in quotation-confirmed dimensions in 2B, BA and brushed finishes, cut to size, with ordered documentation.
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316L Stainless Steel Seamless Pipe
Seamless 316L stainless steel pipe to ASTM A312, in quotation-confirmed NPS and schedule, pickled and annealed, with ordered documentation — for chemical, marine and process service.
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Frequently Asked Questions
Is 2205 harder to weld than 316L?
It requires more discipline, not exotic skill: matched filler (2209), controlled heat input and interpass temperature to keep the austenite-ferrite balance. Qualified shops weld it routinely; the penalty is on unprepared fabricators.
When is 2205 mandatory rather than optional?
Hot chloride environments above ~60 °C where austenitics suffer stress-corrosion cracking — desalination, brine concentration, coastal hot-water systems. There 316L is a known failure mode and duplex is the standard remedy.
Can 2205 use the same welding procedure as 316L?
No. Duplex welding needs controlled heat input, interpass temperature and suitable filler to preserve phase balance, corrosion resistance and toughness.
RFQ
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Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.