When comparing 1.4432 vs 1.4404 (316L), corrosion resistance is the most searched and most critical factor for buyers in chemical, marine, and industrial applications.
Although both grades belong to the 316L stainless steel family, their actual corrosion performance is not identical.
This article focuses specifically on the corrosion resistance difference between EN 1.4432 and EN 1.4404 (316L), helping procurement professionals choose the right grade for the right environment.
What is EN 1.4432 stainless steel?
EN 1.4432 (X2CrNiMo17-12-3) is a high-corrosion-resistant, low-carbon, molybdenum-alloyed austenitic stainless steel, often considered a superior equivalent to 316L. It features enhanced molybdenum (approx. 2.5–3.0%) for improved pitting resistance, making it ideal for chemical, petrochemical, and marine applications requiring high durability in harsh environments.
Is 1.4404 the same as 316L?
1.4404 (also known as AISI 316L or X2CrNiMo17-12-2) is a low-carbon, molybdenum-alloyed austenitic stainless steel. It offers superior corrosion resistance, particularly against pitting and crevice corrosion in chloride-containing environments, and excellent weldability. Due to its low carbon content, it is resistant to intergranular corrosion after welding and is ideal for chemical, pharmaceutical, food, and marine applications.
Overview: 1.4432 vs 1.4404 (316L)
| Grade | Common Name | Key Feature |
|---|---|---|
| 1.4432 | Enhanced 316L | Higher Mo & N |
| 1.4404 | Standard 316L | Balanced performance |
1.4432 vs. 1.4404 (316L): Chemical Composition
The difference in corrosion resistance starts with chemical composition, particularly molybdenum (Mo) and nitrogen (N).
| Element (%) | 1.4432 | 1.4404 (316L) |
|---|---|---|
| Carbon (C) | ≤ 0.03 | ≤ 0.03 |
| Chromium (Cr) | 16.5 – 18.5 | 16.5 – 18.5 |
| Nickel (Ni) | 10.0 – 13.0 | 10.0 – 13.0 |
| Molybdenum (Mo) | 2.5 – 3.0 | 2.0 – 2.5 |
| Nitrogen (N) | ≤ 0.11 | ≤ 0.10 |
Mechanical Properties: 1.4432 vs. 1.4404 (316L)
| Property | EN 1.4432 | EN 1.4404 (316L) |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 200 MPa | ≥ 200 MPa |
| Tensile Strength (Rm) | 500 – 700 MPa | 500 – 700 MPa |
| Elongation (A5) | ≥ 40 % | ≥ 40 % |
| Hardness | ≤ 215 HB | ≤ 215 HB |
| Impact Toughness | Excellent | Excellent |
Physical Properties: 1.4432 vs. 1.4404 (316L)
| Property | EN 1.4432 | EN 1.4404 (316L) |
|---|---|---|
| Density | 8.0 g/cm³ | 8.0 g/cm³ |
| Melting Point | 1370 – 1400 °C | 1370 – 1400 °C |
| Thermal Conductivity (at 20°C) | 15.0 W/m·K | 15.0 W/m·K |
| Coefficient of Thermal Expansion (20–100°C) | 16.0 µm/m·K | 16.0 µm/m·K |
| Electrical Resistivity (at 20°C) | 0.74 µΩ·m | 0.74 µΩ·m |
| Specific Heat Capacity (at 20°C) | 500 J/kg·K | 500 J/kg·K |
Is 1.4432 more corrosion resistant than 1.4404?
Compared to 1.4404 (316L), 1.4432 offers superior corrosion resistance due to its higher molybdenum content (approximately 2.5% to 3.0%, compared to 2.0% to 2.5% for 1.4404), making it more suitable for harsh, high-chloride environments. Both materials are low-carbon austenitic stainless steels and are weldable, but 1.4432 has stronger resistance to pitting corrosion, while 1.4404 is the standard "general-purpose" material.
Is 1.4432 the same as 316L?
Yes, EN 1.4432 is considered an equivalent or superior, more highly alloyed version of AISI 316L (low carbon 316 stainless steel). Both are austenitic stainless steels with similar, often interchangeable properties for high-corrosion applications, but 1.4432 typically contains slightly higher Molybdenum content for better resistance in chloride environments.
Which is better for marine use, 1.4432 or 316L?
1.4432 (X2CrNiMo17-12-3), due to its higher molybdenum content (>2.5%) and nickel content, performs better than standard 316L (1.4404) in harsh marine environments, offering superior resistance to chloride pitting and crevice corrosion. While 316L is the standard "marine grade" stainless steel, 1.4432 provides superior performance for critical underwater components.
If you have project requirements for 316L 1.4404 stainless steel bars, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, and wires. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
