15-5PH / X5CrNiCuNb15-5 vs X12CrNi25-21: 33% composition overlap. Significantly different materials serving different application areas.
15-5PH / X5CrNiCuNb15-5 vs X12CrNi25-21
Side-by-side chemical composition and mechanical property comparison.
Overview
15-5PH / X5CrNiCuNb15-5
1.4545
Martensitic precipitation-hardening stainless steel. Similar to 17-4PH but with better transverse ductility and toughness due to lower delta ferrite. Used for aerospace structural components, nuclear reactor parts, food processing equipment, and high-performance fasteners.
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.
| 15-5PH / X5CrNiCuNb15-5 | X12CrNi25-21 | |
|---|---|---|
| Material Number | 1.4545 | 1.4845 |
| Category | Stainless Steel | Stainless Steel |
| Standard | AMS 5659 | EN 10095 |
Chemical composition (wt%)
| Element | 15-5PH / X5CrNiCuNb15-5 | X12CrNi25-21 | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0–0.15% | OK |
| Si | 0–1% | 0–1.5% | OK |
| Mn | 0–1% | 0–2% | OK |
| P | 0–0.03% | — | — |
Mechanical properties
| Property | 15-5PH / X5CrNiCuNb15-5 | X12CrNi25-21 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1310 | 490–690 | MPa |
| yield_strength | ≥ 1170 | ≥ 190 | MPa |
| elongation | ≥ 10 | ≥ 35 | % |
Compatibility Assessment
15-5PH / X5CrNiCuNb15-5 and X12CrNi25-21 have significantly different compositions (33% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 15-5PH / X5CrNiCuNb15-5 the same as X12CrNi25-21?
15-5PH / X5CrNiCuNb15-5 and X12CrNi25-21 have a 33% composition overlap. They are generally not directly interchangeable.
Can I replace 15-5PH / X5CrNiCuNb15-5 with X12CrNi25-21?
Generally not recommended. The compositions differ significantly (33% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 15-5PH / X5CrNiCuNb15-5 and X12CrNi25-21?
The main differences are in the following elements: Cr, Ni. 15-5PH / X5CrNiCuNb15-5 is a Stainless Steel grade, while X12CrNi25-21 is a Stainless Steel grade.
Related Comparisons
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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.