PH13-8Mo / X3CrNiMoAl13-8-2 vs 17-4PH: Both PH stainless — PH13-8Mo has superior transverse toughness
PH13-8Mo / X3CrNiMoAl13-8-2 vs 17-4PH
Side-by-side chemical composition and mechanical property comparison.
Overview
PH13-8Mo / X3CrNiMoAl13-8-2
1.4534
Premium aerospace precipitation-hardening stainless. Al-precipitation for the highest transverse toughness and most uniform properties of all PH stainless grades. SCC-resistant in marine environments. Used for landing gear, structural airframe parts, nuclear components, and high-performance shafts.
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.
| PH13-8Mo / X3CrNiMoAl13-8-2 | 17-4PH | |
|---|---|---|
| Material Number | 1.4534 | 1.4542 |
| Category | Stainless Steel | Stainless Steel |
| Standard | AMS 5629 | EN 10088-3 |
Chemical composition (wt%)
| Element | PH13-8Mo / X3CrNiMoAl13-8-2 | 17-4PH | Overlap |
|---|---|---|---|
| C | 0–0.05% | 0–0.07% | OK |
| Si | 0–0.1% | 0–0.7% | OK |
| Mn | 0–0.1% | 0–1.5% | OK |
| P | — | 0–0.04% | — |
Mechanical properties
| Property | PH13-8Mo / X3CrNiMoAl13-8-2 | 17-4PH | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1410 | ≥ 1310 | MPa |
| yield_strength | ≥ 1310 | ≥ 1170 | MPa |
| elongation | ≥ 8 | ≥ 10 | % |
Compatibility Assessment
PH13-8Mo uses Al-precipitation (not Cu) for more uniform aging response and better transverse properties. Higher strength (1410 vs 1310 MPa at peak). 17-4PH is cheaper and more widely available. PH13-8Mo for aerospace-critical; 17-4PH for general PH applications.
Frequently Asked Questions
Is PH13-8Mo / X3CrNiMoAl13-8-2 the same as 17-4PH?
PH13-8Mo / X3CrNiMoAl13-8-2 and 17-4PH have a 65% composition overlap. Both PH stainless — PH13-8Mo has superior transverse toughness
Can I replace PH13-8Mo / X3CrNiMoAl13-8-2 with 17-4PH?
Generally not recommended. The compositions differ significantly (65% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between PH13-8Mo / X3CrNiMoAl13-8-2 and 17-4PH?
The main differences are in the following elements: Cr, Ni. PH13-8Mo / X3CrNiMoAl13-8-2 is a Stainless Steel grade, while 17-4PH is a Stainless Steel grade.
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