15-5PH / X5CrNiCuNb15-5 vs 440C / X105CrMo17: 51% composition overlap. Moderate differences, generally not direct substitutes.
15-5PH / X5CrNiCuNb15-5 vs 440C / X105CrMo17
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.
440C / X105CrMo17
1.4125
Highest-hardness standard martensitic stainless steel. Achieves 57-60 HRC — the hardest commonly available stainless grade. Excellent wear resistance from chromium carbides. Used for bearings, races, valve components, surgical instruments, high-end cutlery, and precision molds.
| 15-5PH / X5CrNiCuNb15-5 | 440C / X105CrMo17 | |
|---|---|---|
| Material Number | 1.4545 | 1.4125 |
| Category | Stainless Steel | Stainless Steel |
| Standard | AMS 5659 | EN 10088-3 |
Chemical composition (wt%)
| Element | 15-5PH / X5CrNiCuNb15-5 | 440C / X105CrMo17 | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0.95–1.2% | No overlap |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–1% | 0–1% | OK |
| P | 0–0.03% | 0–0.04% | OK |
Mechanical properties
| Property | 15-5PH / X5CrNiCuNb15-5 | 440C / X105CrMo17 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1310 | ≥ 690 | MPa |
| yield_strength | ≥ 1170 | ≥ 440 | MPa |
| elongation | ≥ 10 | — | % |
Compatibility Assessment
15-5PH / X5CrNiCuNb15-5 and 440C / X105CrMo17 have moderate differences (51% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 15-5PH / X5CrNiCuNb15-5 the same as 440C / X105CrMo17?
15-5PH / X5CrNiCuNb15-5 and 440C / X105CrMo17 have a 51% composition overlap. They are generally not directly interchangeable.
Can I replace 15-5PH / X5CrNiCuNb15-5 with 440C / X105CrMo17?
Generally not recommended. The compositions differ significantly (51% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 15-5PH / X5CrNiCuNb15-5 and 440C / X105CrMo17?
The main differences are in the following elements: C, Cr. 15-5PH / X5CrNiCuNb15-5 is a Stainless Steel grade, while 440C / X105CrMo17 is a Stainless Steel grade.
Related Comparisons
View full data for each material:
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.