303 vs Super Duplex 2507: 35% composition overlap. Significantly different materials serving different application areas.
303 vs Super Duplex 2507
Side-by-side chemical composition and mechanical property comparison.
Overview
303
1.4305
Free-machining austenitic stainless steel — the most machinable of all austenitic grades. 0.15-0.35% S (as MnS inclusions) provides excellent chip-breaking. Trade-off: lower corrosion resistance than 304, poor weldability (hot cracking risk), and not suitable for cold forming. Used for high-volume automatic lathe parts: fittings, valves, screws, shafts, and precision components.
Super Duplex 2507
1.4410
Super duplex stainless steel with PREN >40. Superior corrosion resistance to standard 2205 duplex, especially in chloride and H₂S environments. Used for subsea pipelines, offshore platform components, desalination plants, and chemical processing equipment.
| 303 | Super Duplex 2507 | |
|---|---|---|
| Material Number | 1.4305 | 1.4410 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-2 |
Chemical composition (wt%)
| Element | 303 | Super Duplex 2507 | Overlap |
|---|---|---|---|
| C | 0–0.1% | 0–0.03% | OK |
| Si | 0–1% | 0–0.8% | OK |
| Mn | 0–2% | 0–1.2% | OK |
| P | 0–0.045% | 0–0.035% | OK |
Mechanical properties
| Property | 303 | Super Duplex 2507 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | 730–930 | MPa |
| yield_strength | ≥ 190 | ≥ 530 | MPa |
| elongation | ≥ 35 | ≥ 20 | % |
Compatibility Assessment
303 and Super Duplex 2507 have significantly different compositions (35% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 303 the same as Super Duplex 2507?
303 and Super Duplex 2507 have a 35% composition overlap. They are generally not directly interchangeable.
Can I replace 303 with Super Duplex 2507?
Generally not recommended. The compositions differ significantly (35% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 303 and Super Duplex 2507?
The main differences are in the following elements: S, Cr, Ni. 303 is a Stainless Steel grade, while Super Duplex 2507 is a Stainless Steel grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.