2507 Super Duplex Uns S32750 Hot Rolled Stainless Steel Sheet
Material Grade:2507
Thickness:3–100 Mm
Length:2000–12000 Mm
Width:1000–3000 Mm
Surface Finish:No.1 / HRAP
Application:Chemical Processing Equipment Etc.
Product Description
2507 Super Duplex Stainless Steel Sheet (UNS S32750) is a high-performance duplex stainless steel designed for demanding environments requiring a combination of excellent corrosion resistance, high strength, and good resistance to chloride-induced corrosion. The material combines the beneficial properties of austenitic and ferritic stainless steel, providing higher strength than conventional austenitic grades such as 304L and 316L.
Produced in a hot-rolled condition, 2507 is particularly suitable for heavy-duty industrial applications where both mechanical strength and corrosion resistance are important. It is widely used in chemical processing equipment, petrochemical facilities, marine systems, offshore equipment, heat exchangers, and desalination plants.
Product Specifications
| Specification | Details |
|---|---|
| Product Name | 2507 Super Duplex Stainless Steel Sheet |
| Grade | 2507 |
| UNS | S32750 |
| Material Type | Super Duplex Stainless Steel |
| Microstructure | Austenitic-Ferritic |
| Production Process | Hot Rolled |
| Standard | ASTM A240 / ASME SA240 |
| Surface | No.1 / HRAP |
| Thickness | Approx. 3–100 mm |
| Width | Approx. 1000–3000 mm |
| Length | Approx. 2000–12000 mm |
| Heat Treatment | Solution Annealed |
| Customization | Available |
| Main Application | Chemical Processing Equipment |
Why Choose 2507 Super Duplex Stainless Steel?
2507 is designed for applications where conventional stainless steels may not provide sufficient corrosion resistance or mechanical strength.
Its balanced duplex microstructure provides
Excellent Corrosion Resistance
Pitting corrosion
Crevice corrosion
Chloride-induced corrosion
Stress corrosion cracking
General corrosion
High Mechanical Strength
2507 offers significantly higher yield strength than common austenitic stainless steels such as 304L and 316L. This can allow engineers to use thinner sections in some applications while maintaining the required structural performance.
Excellent Chloride Resistance
2507 is especially suitable for environments containing chlorides, seawater, and aggressive process fluids, making it useful for chemical, marine, offshore, and desalination applications.
Main Application: Chemical Processing Equipment
Chemical Processing Equipment is one of the key application areas for 2507 Super Duplex Stainless Steel Sheet.
It can be used for:
Chemical storage tanks
Process vessels
Pressure vessels
Heat exchangers
Chemical processing equipment
Process piping components
Evaporators
Scrubbers
Chemical storage systems
Corrosive fluid handling equipment
2507 Super Duplex vs 2205 Duplex Stainless Steel
2507 (UNS S32750) and 2205 (UNS S31803/S32205) are both duplex stainless steels, but 2507 is a Super Duplex grade designed for more aggressive corrosion environments and higher strength.
| Property | 2507 Super Duplex | 2205 Duplex |
|---|---|---|
| UNS | S32750 | S31803 / S32205 |
| Type | Super Duplex | Duplex |
| Cr | ~24–26% | ~21–23% |
| Ni | ~6–8% | ~4.5–6.5% |
| Mo | ~3–5% | ~2.5–3.5% |
| N | ~0.24–0.32% | ~0.08–0.20% |
| Yield Strength | ≥ 550 MPa | ≥ 450 MPa |
| Tensile Strength | ≥ 795 MPa | ≥ 620 MPa |
| Pitting Resistance | Excellent | Very Good |
| Chloride Resistance | Excellent | Very Good |
| SCC Resistance | Excellent | Excellent |
| Mechanical Strength | Higher | High |
| Cost | Higher | More economical |
| Typical Environment | Severe corrosion | Moderate–severe corrosion |
How to Choose?
| Requirement | Recommended Grade |
|---|---|
| General duplex stainless steel application | 2205 |
| Cost-sensitive project | 2205 |
| Chemical processing | 2205 / 2507 |
| Severe chemical corrosion | 2507 |
| High chloride environment | 2507 |
| Seawater / offshore | 2507 |
| Very high strength requirement | 2507 |
| Standard marine application | 2205 |
| Severe marine environment | 2507 |
Chemical Composition – 2507 Super Duplex Stainless Steel Sheet
2507 Super Duplex Stainless Steel (UNS S32750) is a high-alloy duplex stainless steel. Its relatively high chromium, molybdenum, and nitrogen contents provide excellent resistance to pitting, crevice corrosion, and chloride-containing environments.
According to ASTM A240 / ASME SA240, the typical chemical composition is:
| Element | Composition (wt. %) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.80 |
| Manganese (Mn) | ≤ 1.20 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.020 |
| Chromium (Cr) | 24.0–26.0 |
| Nickel (Ni) | 6.0–8.0 |
| Molybdenum (Mo) | 3.0–5.0 |
| Nitrogen (N) | 0.24–0.32 |
| Iron (Fe) | Balance |
Physical Properties – 2507 Super Duplex Stainless Steel Sheet
2507 Super Duplex Stainless Steel (UNS S32750) combines high strength with excellent corrosion resistance. Its physical properties are suitable for demanding chemical processing, marine, offshore, and high-pressure industrial applications.
| Property | Typical Value |
|---|---|
| Material | 2507 / UNS S32750 |
| Material Type | Super Duplex Stainless Steel |
| Microstructure | Austenitic-Ferritic |
| Density | ~7.8 g/cm³ |
| Melting Range | ~1350–1390°C |
| Elastic Modulus | ~200 GPa |
| Poisson's Ratio | ~0.30 |
| Thermal Conductivity | ~14 W/m·K at 20°C |
| Specific Heat Capacity | ~500 J/kg·K |
| Electrical Resistivity | ~0.80 μΩ·m at 20°C |
| Coefficient of Thermal Expansion | ~13 × 10⁻⁶ /K (20–100°C) |
| Magnetic Property | Magnetic |
| Crystal Structure | Duplex Austenitic-Ferritic |
Frequently Asked Questions (FAQ)
1. What is 2507 Super Duplex stainless steel?
2507 Super Duplex (UNS S32750) is a high-alloy duplex stainless steel combining an austenitic-ferritic microstructure. It offers excellent corrosion resistance, high strength, and superior resistance to chloride environments.
2. Why is 2507 suitable for chemical processing equipment?
Its high chromium, molybdenum, and nitrogen contents provide outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for aggressive chemical media and process equipment.
3. What is the difference between 2507 and 2205?
2507 is a Super Duplex grade with higher Cr, Mo, and N than 2205, providing higher mechanical strength and better corrosion resistance, especially in seawater and severe chloride environments.
4. Is 2507 stainless steel resistant to seawater?
Yes. 2507 offers excellent resistance to seawater, chlorides, and offshore environments, making it a preferred material for marine and desalination applications.
5. What surface finish is available?
Hot rolled 2507 sheets are commonly supplied with No.1 / HRAP (Hot Rolled, Annealed and Pickled) finish, providing a clean industrial surface suitable for fabrication.
6. Can 2507 be welded?
Yes. 2507 has good weldability when appropriate welding procedures and filler materials are used to maintain the duplex phase balance.
7. Is 2507 magnetic?
Yes. Due to its duplex austenitic-ferritic structure, 2507 is magnetic, unlike fully austenitic grades such as 304L and 316L.
8. What industries commonly use 2507 Super Duplex sheet?
Typical applications include:
Chemical Processing Equipment
Oil & Gas
Offshore Platforms
Marine Engineering
Desalination Plants
Heat Exchangers
Pressure Vessels
Seawater Systems
9. What sizes are available?
Typical supply ranges include:
Thickness: 3–100 mm
Width: 1000–3000 mm
Length: 2000–12000 mm
Custom sizes are available upon request.
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