304 / X5CrNi18-10 vs X12CrNi25-21: 43% composition overlap. Significantly different materials serving different application areas.
304 / X5CrNi18-10 vs X12CrNi25-21
Side-by-side chemical composition and mechanical property comparison.
Overview
304 / X5CrNi18-10
1.4301
The world's most widely used stainless steel — the original 18/8 austenitic. Good corrosion resistance in atmospheric, organic, and inorganic environments. Excellent formability and weldability. Not recommended for chloride-rich or marine environments (use 316L). Used in food processing, kitchen equipment, architecture, tanks, and general engineering.
X12CrNi25-21
1.4845
Heat-resistant 25Cr-21Ni austenitic stainless — AISI 310S (low-C variant). Oxidation resistance to 1050°C continuous, 1150°C intermittent. Higher Cr+Ni than 304/316 = much better high-temperature scaling resistance. Used for furnace parts, radiant tubes, heat treatment fixtures, kiln linings, and thermocouple protection tubes. Also used in petrochemical cracker tubes.
| 304 / X5CrNi18-10 | X12CrNi25-21 | |
|---|---|---|
| Material Number | 1.4301 | 1.4845 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-2 | EN 10095 |
Chemical composition (wt%)
| Element | 304 / X5CrNi18-10 | X12CrNi25-21 | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0–0.15% | OK |
| Si | 0–1% | 0–1.5% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | — | — |
Mechanical properties
| Property | 304 / X5CrNi18-10 | X12CrNi25-21 | Unit |
|---|---|---|---|
| tensile_strength | 500–700 | 490–690 | MPa |
| yield_strength | ≥ 190 | ≥ 190 | MPa |
| elongation | ≥ 45 | ≥ 35 | % |
Compatibility Assessment
304 / X5CrNi18-10 and X12CrNi25-21 have significantly different compositions (43% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 304 / X5CrNi18-10 the same as X12CrNi25-21?
304 / X5CrNi18-10 and X12CrNi25-21 have a 43% composition overlap. They are generally not directly interchangeable.
Can I replace 304 / X5CrNi18-10 with X12CrNi25-21?
Generally not recommended. The compositions differ significantly (43% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 304 / X5CrNi18-10 and X12CrNi25-21?
The main differences are in the following elements: Cr, Ni. 304 / X5CrNi18-10 is a Stainless Steel grade, while X12CrNi25-21 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.