17-4PH vs SUS420J2: 57% composition overlap. Moderate differences, generally not direct substitutes.
17-4PH vs SUS420J2
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.
SUS420J2
Japanese martensitic stainless steel — the higher-carbon variant of the 420 family (C 0.26-0.40%). Achieves HRC 50-55 after heat treatment. Very good corrosion resistance for a martensitic grade. THE budget knife/cutlery steel worldwide. Also used for surgical instruments, haircutting scissors, and industrial blades. ≈ EN X30Cr13 (1.4028) / Chinese 3Cr13.
| 17-4PH | SUS420J2 | |
|---|---|---|
| Material Number | 1.4542 | — |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | JIS G4303 |
Chemical composition (wt%)
| Element | 17-4PH | SUS420J2 | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0.26–0.4% | No overlap |
| Si | 0–0.7% | 0–1% | OK |
| Mn | 0–1.5% | 0–1% | OK |
| P | 0–0.04% | 0–0.04% | OK |
Mechanical properties
| Property | 17-4PH | SUS420J2 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1310 | 620–700 | MPa |
| yield_strength | ≥ 1170 | 340–400 | MPa |
| elongation | ≥ 10 | 12–18 | % |
Compatibility Assessment
17-4PH and SUS420J2 have moderate differences (57% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 17-4PH the same as SUS420J2?
17-4PH and SUS420J2 have a 57% composition overlap. They are generally not directly interchangeable.
Can I replace 17-4PH with SUS420J2?
Generally not recommended. The compositions differ significantly (57% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 17-4PH and SUS420J2?
The main differences are in the following elements: C, Cr, Ni. 17-4PH is a Stainless Steel grade, while SUS420J2 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.