17-4PH vs X12CrNi25-21: 33% composition overlap. Significantly different materials serving different application areas.
17-4PH vs X12CrNi25-21
Side-by-side chemical composition and mechanical property comparison.
Overview
17-4PH
1.4542
The most widely used precipitation-hardening stainless steel. Combines high strength (up to 1310 MPa UTS) with corrosion resistance comparable to 304. Delivered solution-annealed and hardened by simple low-temperature aging. Used in aerospace, medical, oil & gas, and nuclear applications.
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.
| 17-4PH | X12CrNi25-21 | |
|---|---|---|
| Material Number | 1.4542 | 1.4845 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10095 |
Chemical composition (wt%)
| Element | 17-4PH | X12CrNi25-21 | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0–0.15% | OK |
| Si | 0–0.7% | 0–1.5% | OK |
| Mn | 0–1.5% | 0–2% | OK |
| P | 0–0.04% | — | — |
Mechanical properties
| Property | 17-4PH | X12CrNi25-21 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1310 | 490–690 | MPa |
| yield_strength | ≥ 1170 | ≥ 190 | MPa |
| elongation | ≥ 10 | ≥ 35 | % |
Compatibility Assessment
17-4PH 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 17-4PH the same as X12CrNi25-21?
17-4PH and X12CrNi25-21 have a 33% composition overlap. They are generally not directly interchangeable.
Can I replace 17-4PH 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 17-4PH and X12CrNi25-21?
The main differences are in the following elements: Cr, Ni. 17-4PH 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.