303 vs X2CrNiMoN25-7-4: 35% composition overlap. Significantly different materials serving different application areas.
303 vs X2CrNiMoN25-7-4
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.
X2CrNiMoN25-7-4
1.4410
Super duplex stainless steel (SAF 2507 / UNS S32750) with 25% Cr, 7% Ni, 4% Mo, and high N for PREN ≥42. The highest corrosion resistance and strength among standard duplex grades — YS ≥550 MPa is ~2.5× that of 316L. Service temperature up to 300°C. Used for subsea oil & gas equipment (manifolds, trees, risers), desalination plants, flue gas cleaning, chemical tankers, and mining equipment in severe chloride environments. Requires careful welding to avoid sigma phase.
| 303 | X2CrNiMoN25-7-4 | |
|---|---|---|
| Material Number | 1.4305 | 1.4410 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-2 |
Chemical composition (wt%)
| Element | 303 | X2CrNiMoN25-7-4 | Overlap |
|---|---|---|---|
| C | 0–0.1% | ≤ 0.03% | OK |
| Si | 0–1% | ≤ 0.8% | OK |
| Mn | 0–2% | ≤ 1.2% | OK |
| P | 0–0.045% | ≤ 0.035% | OK |
Mechanical properties
| Property | 303 | X2CrNiMoN25-7-4 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | 800–1000 | MPa |
| yield_strength | ≥ 190 | ≥ 550 | MPa |
| elongation | ≥ 35 | ≥ 15 | % |
Compatibility Assessment
303 and X2CrNiMoN25-7-4 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 X2CrNiMoN25-7-4?
303 and X2CrNiMoN25-7-4 have a 35% composition overlap. They are generally not directly interchangeable.
Can I replace 303 with X2CrNiMoN25-7-4?
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 X2CrNiMoN25-7-4?
The main differences are in the following elements: S, Cr, Ni. 303 is a Stainless Steel grade, while X2CrNiMoN25-7-4 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.