316 / X5CrNiMo17-12-2 vs 630 / 17-4PH: 64% composition overlap. Moderate differences, generally not direct substitutes.
316 / X5CrNiMo17-12-2 vs 630 / 17-4PH
Side-by-side chemical composition and mechanical property comparison.
Overview
316 / X5CrNiMo17-12-2
1.4401
Standard-carbon austenitic stainless steel with molybdenum. Higher C than 316L (max 0.07% vs 0.03%) giving slightly higher strength. Same corrosion resistance as 316L. Used where welding is not required or post-weld solution annealing is possible.
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.
| 316 / X5CrNiMo17-12-2 | 630 / 17-4PH | |
|---|---|---|
| Material Number | 1.4401 | 1.4542 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-2 | EN 10088-3 |
Chemical composition (wt%)
| Element | 316 / X5CrNiMo17-12-2 | 630 / 17-4PH | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0–0.07% | OK |
| Si | 0–1% | 0–0.7% | OK |
| Mn | 0–2% | 0–1.5% | OK |
| P | 0–0.045% | 0–0.04% | OK |
Mechanical properties
| Property | 316 / X5CrNiMo17-12-2 | 630 / 17-4PH | Unit |
|---|---|---|---|
| tensile_strength | 530–680 | ≥ 1310 | MPa |
| yield_strength | ≥ 220 | ≥ 1170 | MPa |
| elongation | ≥ 40 | ≥ 10 | % |
Compatibility Assessment
316 / X5CrNiMo17-12-2 and 630 / 17-4PH have moderate differences (64% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 316 / X5CrNiMo17-12-2 the same as 630 / 17-4PH?
316 / X5CrNiMo17-12-2 and 630 / 17-4PH have a 64% composition overlap. They are generally not directly interchangeable.
Can I replace 316 / X5CrNiMo17-12-2 with 630 / 17-4PH?
Generally not recommended. The compositions differ significantly (64% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 316 / X5CrNiMo17-12-2 and 630 / 17-4PH?
The main differences are in the following elements: Cr, Ni. 316 / X5CrNiMo17-12-2 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.
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