303 vs X2CrNiMo18-14-3: 66% composition overlap. Moderate differences, generally not direct substitutes.
303 vs X2CrNiMo18-14-3
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.
X2CrNiMo18-14-3
1.4435
Higher-alloy variant of 316L — Ni 12.5-15.0% (vs 10.0-13.0 for 1.4404) and Mo 2.5-3.0%. Guaranteed delta-ferrite free (essential for pharmaceutical/biotech electropolished surfaces). THE pharma and biotech process equipment stainless. Also used for chemical plant and food processing where maximum pitting resistance in the 316-family is needed.
| 303 | X2CrNiMo18-14-3 | |
|---|---|---|
| Material Number | 1.4305 | 1.4435 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-3 |
Chemical composition (wt%)
| Element | 303 | X2CrNiMo18-14-3 | Overlap |
|---|---|---|---|
| C | 0–0.1% | 0–0.03% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | — | — |
Mechanical properties
| Property | 303 | X2CrNiMo18-14-3 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | 490–690 | MPa |
| yield_strength | ≥ 190 | ≥ 190 | MPa |
| elongation | ≥ 35 | ≥ 40 | % |
Compatibility Assessment
303 and X2CrNiMo18-14-3 have moderate differences (66% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 303 the same as X2CrNiMo18-14-3?
303 and X2CrNiMo18-14-3 have a 66% composition overlap. They are generally not directly interchangeable.
Can I replace 303 with X2CrNiMo18-14-3?
Generally not recommended. The compositions differ significantly (66% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 303 and X2CrNiMo18-14-3?
The main differences are in the following elements: Ni. 303 is a Stainless Steel grade, while X2CrNiMo18-14-3 is a Stainless Steel grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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