304L vs X8CrNiS18-9: 65% composition overlap. Moderate differences, generally not direct substitutes.
304L vs X8CrNiS18-9
Side-by-side chemical composition and mechanical property comparison.
Overview
304L
1.4307
Low-carbon version of 304. Maximum 0.030% C prevents sensitization during welding — no post-weld heat treatment needed. The standard choice for welded structures in food, chemical, and pharmaceutical industries. Often dual-certified with 1.4301.
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.
| 304L | X8CrNiS18-9 | |
|---|---|---|
| Material Number | 1.4307 | 1.4305 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-2 | EN 10088-3 |
Chemical composition (wt%)
| Element | 304L | X8CrNiS18-9 | Overlap |
|---|---|---|---|
| C | 0–0.03% | 0–0.1% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | — | — |
Mechanical properties
| Property | 304L | X8CrNiS18-9 | Unit |
|---|---|---|---|
| tensile_strength | 500–700 | 500–750 | MPa |
| yield_strength | ≥ 200 | ≥ 190 | MPa |
| elongation | ≥ 45 | ≥ 35 | % |
Compatibility Assessment
304L and X8CrNiS18-9 have moderate differences (65% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 304L the same as X8CrNiS18-9?
304L and X8CrNiS18-9 have a 65% composition overlap. They are generally not directly interchangeable.
Can I replace 304L with X8CrNiS18-9?
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 304L and X8CrNiS18-9?
The main differences are in the following elements: S, Cr. 304L 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.
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.