316 / X5CrNiMo17-12-2 vs X8CrNiS18-9: 55% composition overlap. Moderate differences, generally not direct substitutes.
316 / X5CrNiMo17-12-2 vs X8CrNiS18-9
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.
X8CrNiS18-9
1.4305
THE free-cutting austenitic stainless — AISI 303. Sulfur 0.15-0.35% for short-breaking chips and excellent machinability. Not weldable (hot cracking risk from S). Reduced corrosion resistance vs 304 due to sulfide inclusions. Used for high-volume CNC screw machine production of fittings, shafts, bushings, valves, and any turned stainless part where machining cost dominates.
| 316 / X5CrNiMo17-12-2 | X8CrNiS18-9 | |
|---|---|---|
| Material Number | 1.4401 | 1.4305 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-2 | EN 10088-3 |
Chemical composition (wt%)
| Element | 316 / X5CrNiMo17-12-2 | X8CrNiS18-9 | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0–0.1% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | — | — |
Mechanical properties
| Property | 316 / X5CrNiMo17-12-2 | X8CrNiS18-9 | Unit |
|---|---|---|---|
| tensile_strength | 530–680 | 500–750 | MPa |
| yield_strength | ≥ 220 | ≥ 190 | MPa |
| elongation | ≥ 40 | ≥ 35 | % |
Compatibility Assessment
316 / X5CrNiMo17-12-2 and X8CrNiS18-9 have moderate differences (55% 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 X8CrNiS18-9?
316 / X5CrNiMo17-12-2 and X8CrNiS18-9 have a 55% composition overlap. They are generally not directly interchangeable.
Can I replace 316 / X5CrNiMo17-12-2 with X8CrNiS18-9?
Generally not recommended. The compositions differ significantly (55% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 316 / X5CrNiMo17-12-2 and X8CrNiS18-9?
The main differences are in the following elements: S, Cr, Ni. 316 / X5CrNiMo17-12-2 is a Stainless Steel grade, while X8CrNiS18-9 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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