17-4PH vs 630 / 17-4PH: 85% composition overlap. Some similarities but notable differences in alloying elements.
17-4PH vs 630 / 17-4PH
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.
630 / 17-4PH
1.4542
Precipitation-hardening martensitic stainless steel — the highest-strength stainless in common use. Solution anneal at 1040°C then age at 480-620°C for UTS >1300 MPa. Corrosion resistance similar to 304. Cu+Nb precipitation hardening. Trade names include 17-4PH, SUS630. Used for aerospace structural parts, turbine blades, valve components, nuclear waste casks, medical instruments, and oil/gas equipment.
| 17-4PH | 630 / 17-4PH | |
|---|---|---|
| Material Number | 1.4542 | 1.4542 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-3 |
Chemical composition (wt%)
| Element | 17-4PH | 630 / 17-4PH | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0–0.07% | OK |
| Si | 0–0.7% | 0–0.7% | OK |
| Mn | 0–1.5% | 0–1.5% | OK |
| P | 0–0.04% | 0–0.04% | OK |
Mechanical properties
| Property | 17-4PH | 630 / 17-4PH | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1310 | ≥ 1310 | MPa |
| yield_strength | ≥ 1170 | ≥ 1170 | MPa |
| elongation | ≥ 10 | ≥ 10 | % |
Compatibility Assessment
17-4PH and 630 / 17-4PH share some characteristics (85% overlap) but have notable differences. They may be substitutable in some applications but not all. Verify suitability carefully.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 17-4PH the same as 630 / 17-4PH?
17-4PH and 630 / 17-4PH have a 85% composition overlap. For most purposes, they can be considered similar.
Can I replace 17-4PH with 630 / 17-4PH?
In many cases, yes. The compositions overlap significantly (85%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 17-4PH and 630 / 17-4PH?
The main differences are in the following elements: overall alloying content. 17-4PH is a Stainless Steel grade, while 630 / 17-4PH 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.