Baojing Steel supplies high-performance Duplex and Super Duplex Stainless Steel Sheets & Plates for marine engineering, shipbuilding, offshore platforms, seawater systems, desalination and subsea applications.
Duplex stainless steel combines the advantages of austenitic and ferritic stainless steels, offering an excellent balance of high mechanical strength, chloride corrosion resistance, resistance to pitting and crevice corrosion, and resistance to stress corrosion cracking.
For demanding marine environments, Duplex 2205 and Super Duplex 2507 are particularly suitable where conventional 304/316L stainless steel may not provide sufficient strength or corrosion resistance.
| Grade | UNS | Type | Recommended Marine Applications |
|---|---|---|---|
| 2205 | S31803 / S32205 | Duplex | Shipbuilding, offshore structures, seawater systems, marine equipment |
| 2507 | S32750 | Super Duplex | Seawater, desalination, offshore oil & gas, subsea equipment |
| S32760 | S32760 | Super Duplex | Severe marine, offshore and seawater environments |
| 2304 | S32304 | Lean Duplex | General marine structures and equipment |
Duplex stainless steel provides significantly higher mechanical strength than conventional austenitic grades such as 304L and 316L.
This makes 2205 and 2507 suitable for applications requiring high structural strength while maintaining corrosion resistance.
Marine environments contain high levels of chlorides from seawater and salt spray.
Duplex grades provide enhanced resistance to:
Pitting Corrosion · Crevice Corrosion · Chloride Stress Corrosion Cracking
2205 is suitable for many marine and seawater applications.
2507 Super Duplex is designed for more aggressive chloride-containing environments and demanding seawater applications.
The combination of high strength + corrosion resistance helps reduce maintenance requirements and extend service life in demanding marine environments.
| Marine Application | Preferred Grade | Why |
|---|---|---|
| Shipbuilding Structures | 2205 | High strength + corrosion resistance |
| Ship Deck Equipment | 2205 | Strength and marine corrosion resistance |
| Marine Handrails | 316L / 2205 | Corrosion resistance and durability |
| Offshore Platforms | 2205 / 2507 | High strength + severe corrosion resistance |
| Seawater Piping | 2205 / 2507 | Chloride corrosion resistance |
| Seawater Cooling Systems | 2205 / 2507 | Excellent resistance to seawater |
| Ballast Water Systems | 2205 / 2507 | Resistance to chloride-containing water |
| Desalination Equipment | 2205 / 2507 | High resistance to seawater and brine |
| Marine Heat Exchangers | 2205 / 2507 | Corrosion resistance + strength |
| Offshore Oil & Gas | 2205 / 2507 | High strength and harsh-environment resistance |
| Subsea Equipment | 2507 | Severe seawater corrosion resistance |
| Marine Structural Components | 2205 / 2507 | High strength and durability |
| Brine Equipment | 2507 | High chloride resistance |
| Coastal Structures | 316L / 2205 | Salt spray and atmospheric corrosion resistance |
2205 Duplex Stainless Steel is one of the most widely used duplex grades for marine and offshore applications.
Compared with conventional 316L, 2205 provides:
Higher Mechanical Strength
Better Chloride Resistance
Better Resistance to Stress Corrosion Cracking
Excellent Pitting & Crevice Corrosion Resistance
Shipbuilding · Offshore Platforms · Marine Structures · Seawater Systems · Ballast Water Systems · Marine Tanks · Heat Exchangers · Oil & Gas Equipment
High Strength + Marine Corrosion Resistance + Cost-Effective Duplex Solution
2507 Super Duplex Stainless Steel provides a higher level of corrosion resistance and strength than 2205 and is designed for particularly demanding environments.
Seawater Equipment · Desalination · Offshore Oil & Gas · Subsea Equipment · Brine Systems · Marine Heat Exchangers · High-Chloride Applications
Severe Chloride Exposure + High Strength + Maximum Marine Corrosion Resistance
| Property | 316L | 2205 Duplex | 2507 Super Duplex |
|---|---|---|---|
| Corrosion Resistance | ★★★ | ★★★★ | ★★★★★ |
| Chloride Resistance | Good | Excellent | Superior |
| Mechanical Strength | Good | Very High | Extremely High |
| Pitting Resistance | Good | Excellent | Superior |
| Marine Application | General | Demanding | Severe |
| Seawater | Selected Applications | Excellent | Excellent |
| Offshore | Selected Applications | Excellent | Excellent |
| Desalination | Selected Applications | Excellent | Excellent |
| Subsea | Limited / Specific | Selected | Excellent |
| Cost Efficiency | Good | Excellent | Higher |
| Typical Position | General Marine | Main Duplex Choice | Premium Super Duplex Choice |
