301 vs 303: 55% composition overlap. Moderate differences, generally not direct substitutes.
301 vs 303
Side-by-side chemical composition and mechanical property comparison.
Overview
301
1.4310
Austenitic stainless steel with the highest work-hardening rate of all 300-series grades. Lower Cr and Ni (17/7 vs 18/9 for 304) makes it metastable — cold working induces martensite transformation for extreme strength (UTS >1300 MPa in full-hard temper). THE stainless spring steel. Used for stainless springs, washers, clips, structural components requiring high strength + corrosion resistance, and railway car bodies.
303
1.4305
Free-machining austenitic stainless steel — the most machinable of all austenitic grades. 0.15-0.35% S (as MnS inclusions) provides excellent chip-breaking. Trade-off: lower corrosion resistance than 304, poor weldability (hot cracking risk), and not suitable for cold forming. Used for high-volume automatic lathe parts: fittings, valves, screws, shafts, and precision components.
| 301 | 303 | |
|---|---|---|
| Material Number | 1.4310 | 1.4305 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-2 | EN 10088-3 |
Chemical composition (wt%)
| Element | 301 | 303 | Overlap |
|---|---|---|---|
| C | 0.05–0.15% | 0–0.1% | Partial |
| Si | 0–2% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | 0–0.045% | OK |
Mechanical properties
| Property | 301 | 303 | Unit |
|---|---|---|---|
| tensile_strength | 520–720 | 500–750 | MPa |
| yield_strength | ≥ 205 | ≥ 190 | MPa |
| elongation | ≥ 45 | ≥ 35 | % |
Compatibility Assessment
301 and 303 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 301 the same as 303?
301 and 303 have a 55% composition overlap. They are generally not directly interchangeable.
Can I replace 301 with 303?
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 301 and 303?
The main differences are in the following elements: C, S, Ni. 301 is a Stainless Steel grade, while 303 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.