303 vs X5CrNiMo17-12-2: 66% composition overlap. Moderate differences, generally not direct substitutes.
303 vs X5CrNiMo17-12-2
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.
X5CrNiMo17-12-2
1.4401
Standard molybdenum-bearing austenitic stainless steel, known as AISI 316. Similar to 1.4404 (316L) but with higher carbon content (max 0.07%) providing slightly better high-temperature strength. Not resistant to intergranular corrosion after welding — for welded constructions prefer 1.4404 (316L). Used in chemical processing, marine environments, and applications requiring improved pitting resistance over 1.4301 (304).
| 303 | X5CrNiMo17-12-2 | |
|---|---|---|
| Material Number | 1.4305 | 1.4401 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-3 |
Chemical composition (wt%)
| Element | 303 | X5CrNiMo17-12-2 | Overlap |
|---|---|---|---|
| C | 0–0.1% | ≤ 0.07% | OK |
| Si | 0–1% | ≤ 1% | OK |
| Mn | 0–2% | ≤ 2% | OK |
| P | 0–0.045% | — | — |
Mechanical properties
| Property | 303 | X5CrNiMo17-12-2 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | — | MPa |
| yield_strength | ≥ 190 | — | MPa |
| elongation | ≥ 35 | — | % |
Compatibility Assessment
303 and X5CrNiMo17-12-2 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 X5CrNiMo17-12-2?
303 and X5CrNiMo17-12-2 have a 66% composition overlap. They are generally not directly interchangeable.
Can I replace 303 with X5CrNiMo17-12-2?
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 X5CrNiMo17-12-2?
The main differences are in the following elements: Cr, Ni. 303 is a Stainless Steel grade, while X5CrNiMo17-12-2 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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