What is the difference between 1.4436 and 1.4401?
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What is 1.4401 stainless steel?
1.4401 stainless steel is an austenitic stainless steel, also known as AISI 316, which is resistant to corrosion by chlorides and non-oxidizing acids. Its high corrosion resistance stems from the addition of molybdenum (2-3%) to a base of chromium (16.5-18.5%) and nickel (10-13%). It is widely used in food processing, chemical equipment, and marine hardware.
What material is 1.4436 equivalent to?
Material 1.4436 is equivalent to the AISI 316 standard in the United States, which is also known as S31600 in the UNS system. It is a type of austenitic stainless steel with a high corrosion resistance, commonly referred to as an A4 grade of stainless steel.
| Grade | EN Number | Equivalent Standard | Type | Key Feature |
|---|---|---|---|---|
| 1.4401 | EN 1.4401 | AISI 316 | Austenitic | General-purpose stainless steel with good corrosion resistance due to Mo addition |
| 1.4436 | EN 1.4436 | AISI 316 with higher Mo | Austenitic | Improved resistance to pitting and crevice corrosion in chloride environments |
What is the difference between 1.4436 and 1.4401?
1.4401 (also known as AISI 316) and 1.4436 (also known as X3CrNiMo17-13-3) are both austenitic stainless steels, but 1.4436 is a higher-alloyed version with slightly higher corrosion resistance, especially in chloride-containing environments. This is due to the higher molybdenum content in 1.4436, making it a better choice for applications where 1.4401 is not sufficient. The primary difference is the composition, which leads to better corrosion resistance for 1.4436, while 1.4401 has good general corrosion resistance and is often more cost-effective.
Chemical Composition
Both grades belong to the 316 family, but 1.4436 contains slightly more molybdenum (2.5–3.0%) than 1.4401 (2.0–2.5%), making it better suited for marine and chemical environments with higher chloride concentrations.
| Element | 1.4401 (%) | 1.4436 (%) |
|---|---|---|
| Carbon (C) | ≤ 0.07 | ≤ 0.07 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 |
| Chromium (Cr) | 16.5–18.5 | 16.5–18.5 |
| Nickel (Ni) | 10.0–13.0 | 10.5–13.5 |
| Molybdenum (Mo) | 2.0–2.5 | 2.5–3.0 |
| Iron (Fe) | Balance | Balance |
Mechanical Properties
| Property | 1.4401 | 1.4436 |
|---|---|---|
| Tensile Strength (MPa) | 500–700 | 520–750 |
| Yield Strength (MPa) | ≥200 | ≥220 |
| Elongation (%) | ≥40 | ≥35 |
| Hardness (HRB) | ≤95 | ≤95 |
| Density (g/cm³) | 7.98 | 7.98 |
Corrosion Resistance
The higher molybdenum content in 1.4436 provides a higher pitting resistance equivalent number (PREN), typically 25–26 for 1.4401 and 26–27 for 1.4436.
| Environment | 1.4401 Performance | 1.4436 Performance |
|---|---|---|
| Fresh water | Excellent | Excellent |
| Sea water (moderate exposure) | Good | Very good |
| Acids (acetic, phosphoric) | Good | Excellent |
| Chloride solutions | Moderate | Excellent |
| Chemical plant conditions | Good | Excellent |
Is 1.4436 more expensive than 1.4401?
Yes, slightly. The higher molybdenum and nickel content increase cost by around 5–10%, but it offers much better durability in harsh environments.
Can 1.4436 replace 1.4401?
Absolutely. In most cases, 1.4436 can substitute 1.4401, especially where additional corrosion protection is required.
What is the difference between 1.4401 and 1.4435?
The main difference is that 1.4435 is a higher-alloyed version of 1.4401, featuring higher concentrations of molybdenum and nickel, resulting in superior corrosion resistance. This makes 1.4435 more suitable for highly corrosive environments, especially those containing halogenated substances and oxidizing acids. While both are austenitic stainless steels, 1.4435 offers a more refined composition for demanding applications.
If you have any project needs for 1.4401 stainless steel, please feel free to place an 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, pipes, bars, and wires. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
Product Forms: Sheets, plates, coils, bars, and tubes
Standard: EN 10088 / ASTM A240 / ASTM A312
Thickness Range: 0.3 mm – 50 mm
Width: Up to 2000 mm
Certification: EN 10204 3.1, ISO 9001, SGS, BV
Price Range:
1.4401 Stainless Steel Sheet: US$ 2.80 – 3.50 per kg
1.4436 Stainless Steel Sheet: US$ 3.10 – 3.90 per kg
Tip: Always request a Mill Test Certificate (MTC 3.1) to verify Mo content when sourcing 1.4436.
Email: info@gneestainless.com
