303 vs X5CrNi18-10: 73% composition overlap. Some similarities but notable differences in alloying elements.
303 vs X5CrNi18-10
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.
X5CrNi18-10
1.4301
THE most widely used stainless steel worldwide — the original "18/8" austenitic (V2A). Good corrosion resistance in natural environments (water, humidity, weak acids). Non-magnetic when annealed. NOT resistant to intergranular corrosion after welding — use 1.4307 (304L) or 1.4541 (321) for welded service. PREN 17.5-21.1 — not suitable for chloride/seawater. Used everywhere: kitchen equipment, food processing, architecture, chemical tanks, automotive, medical devices.
| 303 | X5CrNi18-10 | |
|---|---|---|
| Material Number | 1.4305 | 1.4301 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-3 |
Chemical composition (wt%)
| Element | 303 | X5CrNi18-10 | Overlap |
|---|---|---|---|
| C | 0–0.1% | 0–0.07% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | 0–0.045% | OK |
Mechanical properties
| Property | 303 | X5CrNi18-10 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | 500–700 | MPa |
| yield_strength | ≥ 190 | ≥ 190 | MPa |
| elongation | ≥ 35 | ≥ 45 | % |
Compatibility Assessment
303 and X5CrNi18-10 share some characteristics (73% 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 X5CrNi18-10?
303 and X5CrNi18-10 have a 73% composition overlap. For most purposes, they can be considered similar.
Can I replace 303 with X5CrNi18-10?
In many cases, yes. The compositions overlap significantly (73%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 303 and X5CrNi18-10?
The main differences are in the following elements: S, Cr. 303 is a Stainless Steel grade, while X5CrNi18-10 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.