1.4404 VS.1.4509 stainless steel :properties
May 07, 2025
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1.4404 vs. 1.4509 Stainless Steel: What's the Difference in Properties?
When selecting stainless steel for industrial applications, comparing 1.4404 (AISI 316L) and 1.4509 (AISI 441) is crucial for choosing the right material. These two stainless steel grades belong to different metallurgical families-austenitic vs. ferritic-and serve different engineering purposes.
What are the properties of 1.4404 stainless steel?
1.4404, also known as AISI 316L, is an austenitic stainless steel with added molybdenum (2–2.5%) for enhanced corrosion resistance. It features low carbon content (≤0.03%), making it highly resistant to intergranular corrosion and excellent for welding.
Type: Austenitic (non-magnetic)
Corrosion Resistance: Excellent (marine-grade)
Applications: Food processing, chemical plants, marine fittings, heat exchangers
What is 1.4509 Stainless Steel?
1.4509, equivalent to AISI 441, is a ferritic stainless steel that offers good corrosion and oxidation resistance at a lower cost due to very low nickel content. It is stabilized with titanium and niobium, reducing sensitivity to welding heat and improving formability.
Type: Ferritic (magnetic)
Corrosion Resistance: Good in non-aggressive environments
Applications: Automotive exhausts, kitchen appliances, building interiors
Difference between 316L and 441 stainless steel
| Property | 1.4404 (316L) | 1.4509 (441) |
|---|---|---|
| Stainless Steel Type | Austenitic | Ferritic |
| Magnetic? | No | Yes |
| Density | 7.93 g/cm³ | 7.70 g/cm³ |
| Chromium (Cr) | 16.5–18.5% | 17.5–18.5% |
| Nickel (Ni) | 10–13% | ≤1.0% |
| Molybdenum (Mo) | 2.0–2.5% | - |
| Carbon (C) | ≤0.03% | ≤0.025% |
| Yield Strength | ≥ 220 MPa | ≥ 240 MPa |
| Tensile Strength | 500–700 MPa | 430–630 MPa |
| Elongation | ≥ 40% | ≥ 20% |
| Hardness (HRB) | ≤ 95 | ≤ 90 |
| Pitting Resistance (PREN) | 24–28 | ~18–20 |
| Heat Resistance | Up to 870°C | Up to 950°C (intermittent) |
| Weldability | Excellent | Good (with care to avoid grain growth) |
Is 1.4509 stainless steel magnetic?
1.4509 stainless steel Stainless steel is ferritic, which means that its crystal structure consists mainly of ferrite (body-centered cubic structure). Unlike austenitic stainless steels such as 304 or 316, ferritic stainless steels like 1.4509 (also known as AISI 441) retain their magnetic properties even after cold working or welding.
Gnee 1.4404 Stainless Steel Supplier
At Gnee, we stock and process a wide range of stainless steels, including 1.4404 (316L) and 1.4509 (441) in sheets, plates, coils, and welded tubes. Our technical team can help you select the best grade based on your application and budget.
Need a mill test certificate (MTC), ASTM/EN compliance, or surface finishing options like 2B, No.4, BA, or HL? We've got you covered.
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