303 vs 304 Stainless Steel: 67% composition overlap. Moderate differences, generally not direct substitutes.
303 vs 304 Stainless Steel
Side-by-side chemical composition and mechanical property comparison.
Overview
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.
304 Stainless Steel
1.4301
The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
| 303 | 304 Stainless Steel | |
|---|---|---|
| Material Number | 1.4305 | 1.4301 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-3 | EN 10088-2 |
Chemical composition (wt%)
| Element | 303 | 304 Stainless Steel | Overlap |
|---|---|---|---|
| C | 0–0.1% | 0–0.07% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| P | 0–0.045% | 0–0.045% | OK |
Mechanical properties
| Property | 303 | 304 Stainless Steel | Unit |
|---|---|---|---|
| tensile_strength | 500–750 | 520–720 | MPa |
| yield_strength | ≥ 190 | ≥ 210 | MPa |
| elongation | ≥ 35 | ≥ 45 | % |
Compatibility Assessment
303 and 304 Stainless Steel have moderate differences (67% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 303 the same as 304 Stainless Steel?
303 and 304 Stainless Steel have a 67% composition overlap. They are generally not directly interchangeable.
Can I replace 303 with 304 Stainless Steel?
Generally not recommended. The compositions differ significantly (67% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 303 and 304 Stainless Steel?
The main differences are in the following elements: S, Cr. 303 is a Stainless Steel grade, while 304 Stainless Steel 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.