EN 1.4303 vs. AISI 304L Stainless Steel
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EN 1.4303 vs. AISI 304L Stainless Steel: What's the Difference?
When selecting stainless steel for applications requiring excellent corrosion resistance and weldability, low-carbon grades are often preferred. Two commonly referenced designations are EN 1.4303 and AISI 304L. While they are similar, they are not exactly the same.
This article explores the key differences and similarities between EN 1.4303 and AISI 304L stainless steel in terms of chemical composition, mechanical properties, and typical uses.
EN 1.4303 vs. AISI 304L – Grade Standards
| Standard | Grade | Common Name |
|---|---|---|
| EN (Europe) | 1.4303 | X5CrNi18-10 or 305 |
| ASTM/AISI (USA) | 304L | UNS S30403 |
AISI 304L is a low-carbon version of 304 stainless steel, widely used in welding and corrosion-sensitive applications.
EN 1.4303 corresponds to AISI 305 in the AISI system, not 304L. It has even lower carbon and higher nickel content, which improves deep drawing capability.
Note: EN 1.4303 is sometimes mistakenly considered equivalent to 304L, but it is closer to AISI 305.
EN 1.4303 vs. AISI 304L:Chemical Composition
| Element | EN 1.4303 (AISI 305) | AISI 304L |
|---|---|---|
| Carbon (C) | ≤ 0.03% | ≤ 0.03% |
| Chromium (Cr) | 17.0–19.0% | 18.0–20.0% |
| Nickel (Ni) | 10.0–13.0% | 8.0–12.0% |
| Manganese (Mn) | ≤ 2.0% | ≤ 2.0% |
| Silicon (Si) | ≤ 1.0% | ≤ 1.0% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.045% |
| Sulfur (S) | ≤ 0.03% | ≤ 0.03% |
EN 1.4303 vs. AISI 304L:Mechanical Properties
| Property | EN 1.4303 | AISI 304L |
|---|---|---|
| Yield Strength (Rp0.2) | ~220 MPa | ≥170 MPa |
| Tensile Strength (Rm) | ~520–680 MPa | 485–620 MPa |
| Elongation | ≥ 40% | ≥ 40% |
| Hardness (HB) | ≤ 200 | ≤ 170 |
EN 1.4303 vs. AISI 304L: How to choose?
| Need | Recommended Grade |
|---|---|
| Welding in corrosive environments | AISI 304L |
| Deep drawing or cold forming | EN 1.4303 |
| General-purpose corrosion resistance | Both suitable |
