303 vs 316 / X5CrNiMo17-12-2: 61% composition overlap. Moderate differences, generally not direct substitutes.
303 vs 316 / 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.
316 / X5CrNiMo17-12-2
1.4401
Standard-carbon austenitic stainless steel with molybdenum. Higher C than 316L (max 0.07% vs 0.03%) giving slightly higher strength. Same corrosion resistance as 316L. Used where welding is not required or post-weld solution annealing is possible.
| 303 | 316 / X5CrNiMo17-12-2 | |
|---|---|---|
| Material Number | 1.4305 | 1.4401 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-2 |
Chemical composition (wt%)
| Element | 303 | 316 / X5CrNiMo17-12-2 | 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 | 316 / X5CrNiMo17-12-2 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | 530–680 | MPa |
| yield_strength | ≥ 190 | ≥ 220 | MPa |
| elongation | ≥ 35 | ≥ 40 | % |
Compatibility Assessment
303 and 316 / X5CrNiMo17-12-2 have moderate differences (61% 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 316 / X5CrNiMo17-12-2?
303 and 316 / X5CrNiMo17-12-2 have a 61% composition overlap. They are generally not directly interchangeable.
Can I replace 303 with 316 / X5CrNiMo17-12-2?
Generally not recommended. The compositions differ significantly (61% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 303 and 316 / X5CrNiMo17-12-2?
The main differences are in the following elements: S, Cr, Ni. 303 is a Stainless Steel grade, while 316 / 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.
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.