303 vs X6CrNiTi18-10: 81% composition overlap. Some similarities but notable differences in alloying elements.
303 vs X6CrNiTi18-10
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.
X6CrNiTi18-10
1.4541
Titanium-stabilized austenitic stainless — AISI 321. Ti (5×C min) prevents Cr-carbide sensitization during welding or service at 400-800°C. Same approach as Nb-stabilized 347 (1.4550) but with Ti instead. Better creep resistance than 304/304L at elevated temperature. Used for exhaust manifolds, aircraft exhaust systems, expansion bellows, and high-temperature chemical plant (to ~800°C).
| 303 | X6CrNiTi18-10 | |
|---|---|---|
| Material Number | 1.4305 | 1.4541 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-3 |
Chemical composition (wt%)
| Element | 303 | X6CrNiTi18-10 | Overlap |
|---|---|---|---|
| C | 0–0.1% | 0–0.08% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | — | — |
Mechanical properties
| Property | 303 | X6CrNiTi18-10 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | 500–700 | MPa |
| yield_strength | ≥ 190 | ≥ 190 | MPa |
| elongation | ≥ 35 | ≥ 40 | % |
Compatibility Assessment
303 and X6CrNiTi18-10 share some characteristics (81% overlap) but have notable differences. They may be substitutable in some applications but not all. Verify suitability carefully.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 303 the same as X6CrNiTi18-10?
303 and X6CrNiTi18-10 have a 81% composition overlap. For most purposes, they can be considered similar.
Can I replace 303 with X6CrNiTi18-10?
In many cases, yes. The compositions overlap significantly (81%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 303 and X6CrNiTi18-10?
The main differences are in the following elements: Ni. 303 is a Stainless Steel grade, while X6CrNiTi18-10 is a Stainless Steel grade.
Related Comparisons
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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.