Is 1.4401 equivalent to SS316?
Apr 02, 2026
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Introduction to 1.4401 Stainless Steel
1.4401 stainless steel, commonly known as 316 or UNS S31600, is a molybdenum-alloyed austenitic stainless steel that offers superior corrosion resistance compared to 304, particularly in chloride-containing environments. The addition of 2-3% molybdenum significantly enhances its resistance to pitting and crevice corrosion, making it the standard choice for applications where exposure to chlorides, industrial chemicals, or saline environments is expected. It is widely used in chemical processing, pharmaceutical equipment, marine applications, and food processing industries where higher corrosion resistance is required.
Chemical compositionof 1.4401 stainless steel
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.07 |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤1.00 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.015 |
| Chromium (Cr) | 16.50‑18.50 |
| Nickel (Ni) | 10.00‑13.00 |
| Molybdenum (Mo) | 2.00‑2.50 |
Equivalent Grades of 1.4401 stainless steel
| Standard | Equivalent Grade |
|---|---|
| EN (Europe) | 1.4401 |
| ASTM/AISI (USA) | 316, UNS S31600 |
| JIS (Japan) | SUS316 |
| KS (Korea) | STS316 |
| Common Name | 316 |
Available forms: seamless & welded tubes, plates, sheets, round bars, forgings, sections.
Mechanical Properties of 1.4401 stainless steel
| Property | Value |
|---|---|
| Tensile Strength Rm | 500‑700 MPa |
| 0.2% Offset Yield Strength Rp0.2 | ≥200 MPa |
| Elongation A | ≥40 % |
| Brinell Hardness HBW | ≤215 |
Cannot be hardened by heat treatment; strength improvement only achieved by cold working.
Physical Properties (20 ℃) of 1.4401 stainless steel
| Item | Parameter |
|---|---|
| Density | 7.98 g/cm³ |
| Modulus of Elasticity | 200 GPa |
| Coefficient of Linear Expansion | 16.0×10⁻⁶ /℃ (20‑100℃) |
| Thermal Conductivity | 16.3 W/(m·K) |
| Specific Heat Capacity | 500 J/(kg·℃) |
| Melting range | 1375‑1400 ℃ |
| Microstructure | Austenitic, non‑magnetic (slight magnetism after cold deformation) |
| Max continuous service temperature | Up to 600 ℃ |
Key Characteristics of 1.4401 / 316 stainless steel
Applications of 1.4401 / 316 stainless steel
4.Medical Devices:
Food industry pipelines
petrochemical industry pipelines
marine industry pipelines
Manufacturer Introduction of 1.4401 / 316 stainless steel
1.4401 stainless steel forgings
1.4401 stainless steel plates
1.4401 stainless steel tubes
Quality Guarantee Certificate for 316 Stainless Steel Products
What is the primary advantage of 316 (1.4401) over 304 (1.4301) stainless steel?
The main advantage is the addition of 2-2.5% molybdenum, which dramatically improves resistance to localized corrosion-especially pitting and crevice corrosion-in environments containing chloride ions. This makes 316 the preferred choice for applications in marine environments, coastal areas, chemical processing plants using chlorides, and anywhere exposure to salt, brine, de-icing salts, or halogen compounds is expected. 316 also offers improved strength at elevated temperatures and better resistance to reducing acids. While 304 is suitable for general-purpose applications, 316 offers extended service life in more aggressive conditions.
Can 316 stainless steel be used in seawater applications?
While 316 is significantly more resistant to chloride attack than 304, its performance in stagnant or slow-moving seawater can be limited, especially at higher temperatures or in crevice conditions. For fully immersed seawater applications, more highly alloyed stainless steels (like duplex 2205, super duplex grades, or 6% Mo super austenitic grades) or non-ferrous alloys are often recommended. However, 316 is suitable for above-waterline marine components, splash zone applications, and in flowing seawater conditions with regular maintenance and cleaning. For applications requiring extended seawater immersion, higher alloyed materials should be considered.
What are the welding considerations for 316?
316 has good weldability using all common methods including TIG, MIG, SMAW, and SAW. Key considerations include:
Matching filler metals (ER316 for TIG/MIG, E316-16 for SMAW) are recommended
For heavy welded sections or applications requiring maximum corrosion resistance, 316L filler may be preferred
Low carbon versions (316L) eliminate sensitization risk without post-weld heat treatment
Recommended heat input: 0.5-2.0 kJ/mm
Interpass temperature should be kept below 150°C
Post-weld cleaning and pickling/passivation are recommended for optimum corrosion resistance
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