304 / X5CrNi18-10 vs 440C / X105CrMo17: 51% composition overlap. Moderate differences, generally not direct substitutes.
304 / X5CrNi18-10 vs 440C / X105CrMo17
Side-by-side chemical composition and mechanical property comparison.
Overview
304 / X5CrNi18-10
1.4301
The world's most widely used stainless steel — the original 18/8 austenitic. Good corrosion resistance in atmospheric, organic, and inorganic environments. Excellent formability and weldability. Not recommended for chloride-rich or marine environments (use 316L). Used in food processing, kitchen equipment, architecture, tanks, and general engineering.
440C / X105CrMo17
1.4125
Highest-hardness standard martensitic stainless steel. Achieves 57-60 HRC — the hardest commonly available stainless grade. Excellent wear resistance from chromium carbides. Used for bearings, races, valve components, surgical instruments, high-end cutlery, and precision molds.
| 304 / X5CrNi18-10 | 440C / X105CrMo17 | |
|---|---|---|
| Material Number | 1.4301 | 1.4125 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-2 | EN 10088-3 |
Chemical composition (wt%)
| Element | 304 / X5CrNi18-10 | 440C / X105CrMo17 | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0.95–1.2% | No overlap |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–1% | OK |
| P | 0–0.045% | 0–0.04% | OK |
Mechanical properties
| Property | 304 / X5CrNi18-10 | 440C / X105CrMo17 | Unit |
|---|---|---|---|
| tensile_strength | 500–700 | ≥ 690 | MPa |
| yield_strength | ≥ 190 | ≥ 440 | MPa |
| elongation | ≥ 45 | — | % |
Compatibility Assessment
304 / X5CrNi18-10 and 440C / X105CrMo17 have moderate differences (51% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 304 / X5CrNi18-10 the same as 440C / X105CrMo17?
304 / X5CrNi18-10 and 440C / X105CrMo17 have a 51% composition overlap. They are generally not directly interchangeable.
Can I replace 304 / X5CrNi18-10 with 440C / X105CrMo17?
Generally not recommended. The compositions differ significantly (51% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 304 / X5CrNi18-10 and 440C / X105CrMo17?
The main differences are in the following elements: C, Cr. 304 / X5CrNi18-10 is a Stainless Steel grade, while 440C / X105CrMo17 is a Stainless Steel grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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