First choice for marine, chemical and petroleum industries! Comparison of S32760 and S32750 stainless steel
S32760 vs. S32750: Comparison of super duplex stainless steel
S32760 and S32750 are both super duplex stainless steels (Super Duplex Stainless Steel). They have similar properties, but there are subtle differences in chemical composition, corrosion resistance, mechanical properties, etc.
1. Comparison of chemical composition of S32760 vs. S32750
Chemical Composition Comparison
|
Element |
S32760 (1.4501) |
S32750 (1.4410) |
Key Differences |
|---|---|---|---|
|
Chromium (Cr) |
24 - 26% |
24 - 26% |
Identical content, provides corrosion resistance |
|
Nickel (Ni) |
6 - 8% |
6 - 8% |
Identical content, enhances toughness and corrosion resistance |
|
Molybdenum (Mo) |
3 - 4% |
3 - 5% |
S32750 has slightly higher Mo content, enhances corrosion resistance |
|
Nitrogen (N) |
0.2 - 0.3% |
0.24 - 0.32% |
Similar content, improves strength and corrosion resistance |
|
Copper (Cu) |
0.5 - 1.0% |
None |
S32760 contains Cu, improving resistance to acid corrosion |
|
Tungsten (W) |
0.5 - 1.0% |
None |
S32760 contains W, enhancing pitting resistance |
|
Iron (Fe) |
Balance |
Balance |
Primary matrix element in both alloys |
2. Comparison of mechanical properties
Mechanical Properties Comparison
|
Property |
S32760 |
S32750 |
Key Differences |
|---|---|---|---|
|
Yield Strength (MPa) |
≥ 550 |
≥ 550 |
Identical, high strength |
|
Tensile Strength (MPa) |
≥ 750 |
≥ 800 |
S32750 slightly higher |
|
Elongation (%) |
≥ 25 |
≥ 15 |
S32760 has superior plasticity |
|
Hardness (HB) |
≤ 310 |
≤ 310 |
Identical |
|
Impact Toughness (J, -46°C) |
≥ 45 |
≥ 40 |
S32760 slightly better |
S32760 has better toughness and ductility, so it performs better when subjected to dynamic loads such as vibration and shock.
S32750 has slightly higher tensile strength for higher stress environments.
3. Corrosion resistance comparison
Corrosion Resistance Comparison
|
Corrosion Environment |
S32760 |
S32750 |
Key Differences |
|---|---|---|---|
|
Pitting & Crevice Corrosion |
PREN 40+, Excellent |
PREN 42+, Superior |
S32750 has slightly stronger pitting resistance |
|
Seawater Environment |
⭐⭐⭐⭐⭐ (Excellent) |
⭐⭐⭐⭐⭐ (Excellent) |
Similar performance, both suitable for marine applications |
|
Acid Corrosion |
⭐⭐⭐⭐⭐ (Cu-enhanced, Optimal) |
⭐⭐⭐⭐ (Very Good) |
S32760 exhibits better acid resistance due to Cu content |
|
Chloride SCC<sup>*</sup> |
⭐⭐⭐⭐⭐ (Excellent) |
⭐⭐⭐⭐⭐ (Excellent) |
Comparable resistance to chloride environments |
|
Wear & Erosion Resistance |
⭐⭐⭐⭐⭐ (Excellent) |
⭐⭐⭐⭐ (Very Good) |
S32760 demonstrates superior wear resistance |
S32760 performs better in acidic environments (such as sulfuric acid and phosphoric acid) because it contains copper (Cu) and tungsten (W), which can enhance corrosion resistance.
S32750 has slightly stronger resistance to pitting and crevice corrosion in chloride environments (such as seawater and high-temperature salt water), making it suitable for marine engineering.
4. Comparison of applicable scenarios
Applications Comparison
|
Application Field |
S32760 |
S32750 |
Key Differences |
|---|---|---|---|
|
Marine Engineering |
✅✅✅✅✅ (Optimal) |
✅✅✅✅✅ (Optimal) |
Comparable performance in seawater environments |
|
Oil & Gas |
✅✅✅✅✅ (Optimal) |
✅✅✅✅✅ (Optimal) |
Similar resistance to sulfide corrosion |
|
Chemical Industry |
✅✅✅✅✅ (Cu-enhanced) |
✅✅✅✅ (Excellent) |
S32760 excels in acid-resistant applications |
|
Food & Pharmaceuticals |
✅✅✅✅ (Excellent) |
✅✅✅✅ (Excellent) |
Both suitable for hygienic processing equipment |
|
High-Temp Heat Exchangers |
✅✅✅✅ (Excellent) |
✅✅✅✅✅ (Optimal) |
S32750 preferred for saline environments >80°C |
|
Pulp & Paper |
✅✅✅✅✅ (Optimal) |
✅✅✅✅✅ (Optimal) |
Comparable alkali resistance for processing equipment |
S32760 is suitable for a wider range of chemical and acidic media environments, especially those containing sulfuric acid and phosphoric acid.
S32750 is more suitable for high-temperature chloride environments, such as high-temperature heat exchangers and seawater cooling systems.
5. Price & Availability
Economic & Supply Factors Comparison
|
Comparison Item |
S32760 |
S32750 |
|---|---|---|
|
Raw Material Price |
Moderately Higher |
Slightly Lower |
|
Processing Difficulty |
Slightly Higher |
Relatively Lower |
|
Market Availability |
Relatively Scarce |
Widely Available |
S32760 material is slightly more expensive because it contains Cu and W, which increases the cost.
S32750 is more widely used in industry, has a more stable supply, and is slightly cheaper.
6. How to choose?
If your application requires higher acid resistance (such as sulfuric acid, phosphoric acid) → Choose S32760 (more acid resistant, suitable for chemical industry).
If your application is mainly seawater, high temperature chloride environment → Choose S32750 (more pitting resistant, suitable for marine engineering, heat exchangers).
If your equipment requires better toughness and wear resistance → Choose S32760 (stronger impact resistance).
If higher tensile strength is required → Choose S32750 (slightly higher tensile strength).
Overview:
S32760 = More acid-resistant, tougher, and more wear-resistant, suitable for chemical, petroleum, natural gas, and impact-resistant applications.
S32750 = Higher strength, more pitting-resistant, suitable for marine engineering and high-temperature chloride environments.
