SS316 vs SUS316 Stainless Steel: What's the Difference?
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If you're sourcing stainless steel for chemical equipment, marine structures, or food-grade applications, you've likely encountered terms like SUS316, SS316, and SS316L. These grades are closely related, but there are critical differences-especially when it comes to corrosion resistance, weldability, and long-term performance.
This guide compares SUS316 vs SS316L stainless steel plate, helping procurement teams and engineers make informed decisions.
What Is SS316 Stainless Steel?
SS316, also known as AISI 316, is a high-quality stainless steel that is often used in applications that require corrosion resistance and strength. It contains 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, which significantly enhances its resistance to chloride-induced corrosion.
What Is SUS316 Stainless Steel?
SUS316 is essentially the same as SS316 but is the Japanese industrial standard name for the material. SUS stands for Steel Use Stainless, and the number 316 refers to the alloy's composition and properties. SUS316 follows the JIS (Japanese Industrial Standard), which is equivalent to SS316 in the U.S. and other international standards.
In practice, SS316 and SUS316 are chemically and mechanically identical, and the only difference is the naming convention used in different regions.
| Grade | Standard System | Common Use Region |
|---|---|---|
| SUS316 | JIS (Japan) | Japan, Korea, some Chinese mills |
| SS316 | AISI / ASTM (USA) | Global use (ASTM A240, A213) |
| SS316L | AISI / ASTM (USA) | Low-carbon version of SS316 |
Chemical Composition
| Element | SUS316 / SS316 (%) | SS316L (%) |
|---|---|---|
| Chromium | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum | 2.0 – 3.0 | 2.0 – 3.0 |
| Carbon | ≤ 0.08 | ≤ 0.03 (low carbon) |
Mechanical Properties
| Property | SUS316 / SS316 | SS316L |
|---|---|---|
| Tensile Strength (Rm) | 515 – 750 MPa | 485 – 700 MPa |
| Yield Strength (Rp0.2) | ≥ 205 MPa | ≥ 170 MPa |
| Elongation | ≥ 40% | ≥ 45% |
| Hardness (HB) | ≤ 217 | ≤ 217 |
Application Scenarios
| Application | Recommended Grade |
|---|---|
| Welded tanks & pressure vessels | ✅ SS316L |
| Offshore structures | ✅ SUS316 / SS316L |
| Chemical and acid piping | ✅ SS316L |
| Food & beverage machinery | ✅ SUS316L |
| High-strength marine components | ✅ SUS316 |
Is SS316 low-carbon stainless steel better than SUS316?
Yes. SS316L is generally considered superior to SUS316 in applications involving welding or corrosive environments because its lower carbon content (≤0.03%) significantly reduces the risk of post-weld intergranular corrosion.
While the corrosion resistance and mechanical properties of both grades are similar, SS316L stainless steel corrosion-resistant plate is preferred for pressure vessels, sanitary systems, and components that must comply with ASME or EN standards. However, SUS316 remains suitable for non-welded components.
Looking for SS316/SUS316 stainless steel for your marine, chemical, or industrial project?Contact GNEE today for free quotes, customized solutions, and professional support for all your stainless steel needs.
SS316 stainless steel plate Product Forms
Thickness: 2.0 mm to 50 mm
Width: up to 1500 / 2000 mm
Finish: 2B, No.1, No.4, HL, mirror
Standards: ASTM A240, JIS G4304, EN 10088-2
Certificates: EN 10204 3.1, NACE MR0175, PED
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