303 vs X2CrNiMo17-12-2: 56% composition overlap. Moderate differences, generally not direct substitutes.
303 vs X2CrNiMo17-12-2
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.
X2CrNiMo17-12-2
1.4404
Low-carbon molybdenum-bearing austenitic stainless steel, widely known as AISI 316L. The Mo addition (2–2.5%) significantly improves resistance to pitting and crevice corrosion compared to 1.4301 (304). Low carbon content (max 0.03%) ensures resistance to intergranular corrosion after welding without post-weld heat treatment. Standard grade for pharmaceutical, petrochemical, chemical and marine applications. PREN 23–29.
| 303 | X2CrNiMo17-12-2 | |
|---|---|---|
| Material Number | 1.4305 | 1.4404 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-3 |
Chemical composition (wt%)
| Element | 303 | X2CrNiMo17-12-2 | Overlap |
|---|---|---|---|
| C | 0–0.1% | ≤ 0.03% | OK |
| Si | 0–1% | ≤ 1% | OK |
| Mn | 0–2% | ≤ 2% | OK |
| P | 0–0.045% | ≤ 0.045% | OK |
Mechanical properties
| Property | 303 | X2CrNiMo17-12-2 | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | — | MPa |
| yield_strength | ≥ 190 | — | MPa |
| elongation | ≥ 35 | — | % |
Compatibility Assessment
303 and X2CrNiMo17-12-2 have moderate differences (56% 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 X2CrNiMo17-12-2?
303 and X2CrNiMo17-12-2 have a 56% composition overlap. They are generally not directly interchangeable.
Can I replace 303 with X2CrNiMo17-12-2?
Generally not recommended. The compositions differ significantly (56% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 303 and X2CrNiMo17-12-2?
The main differences are in the following elements: S, Cr, Ni. 303 is a Stainless Steel grade, while X2CrNiMo17-12-2 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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