Difference between SS316 and SUS316L
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SS316 vs SUS316L: How to Differentiate? A Must-Read Guide for Stainless Steel Procurement Engineers
SS316 and SUS316L are commonly used stainless steel grades in global procurement and engineering applications. While both belong to the austenitic stainless steel family, they differ significantly in standard systems, carbon content, corrosion resistance, weldability, and application fields.
This article provides a detailed analysis of the core differences between these two grades, along with standard comparisons and practical selection recommendations from a procurement engineer's perspective.
1. SS316 vs SUS316L: Different Standard
| Grade | Source Standard | Standard Representation | Type |
|---|---|---|---|
| SS316 | AISI / ASTM (e.g., ASTM A240) | Common US Standard | Medium-carbon Austenitic Stainless Steel (C ≤ 0.08%) |
| SUS316L | JIS G4303 (Japanese Standard) | Japanese Industrial Standard (JIS) | Ultra-low carbon Austenitic Stainless Steel (C ≤ 0.03%) |
2. SS316 vs SUS316L: Chemical Composition and Mechanical Properties Comparison
| Property | SS316 (AISI 316) | SUS316L (JIS 316L) |
|---|---|---|
| Carbon (C) | ≤ 0.08% | ≤ 0.03% |
| Nickel (Ni) | 10.0–14.0% | 12.0–15.0% |
| Tensile Strength (Rm) | ≥ 520 MPa | ≥ 480 MPa |
| Yield Strength (Rp0.2) | ≥ 205 MPa | ≥ 175 MPa |
| Elongation (A5) | ≥ 40% | ≥ 40% |
| Hardness (HBW) | ≤ 217 | ≤ 187 |
3.SS316 vs SUS316L: Welding Performance and Corrosion Resistance
| Feature | SS316 | SUS316L |
|---|---|---|
| Post-Weld Treatment | Annealing recommended to avoid intergranular corrosion | No annealing required, can be used directly |
| Pitting Corrosion Resistance | Good, but high risk of heat-affected zone corrosion | Excellent, suitable for acidic and marine environments |
| Biocompatibility | Moderate, not recommended for implant devices | Excellent, widely used in medical implants |
4. SS316 vs SUS316L: Application
| Application Field | SS316 (High Strength Requirement) | SUS316L (High Corrosion/Weldability Requirement) |
|---|---|---|
| Medical Equipment | Surgical tool handles, housings (non-implantable) | Bone screws, joint replacements, pacemaker casings (implant-grade materials) |
| Chemical Equipment | Valves, pump bodies (non-welded components) | Reaction vessels, pressure pipelines, welded tanks |
| Food Processing | Components not in long-term contact with acidic liquids | Juice production lines, dairy processing equipment, meets FDA hygiene standards |
| Marine Engineering | Land-based supports or dry-area fasteners | Desalination equipment, propellers, ship piping systems |
| Building Decoration | Door handles, stair railings, window frames | Coastal railings, sculptures, stainless steel curtain wall bolts |
| Home and Kitchenware | Kitchen knives, cookware components | Rarely used due to lower hardness, unsuitable for high-wear cutting components |
5. Correspondence with Other Stainless Steel Grades
| International Standard | SS316 | SUS316L |
|---|---|---|
| EU Standard | EN 1.4401 | EN 1.4404 |
| US Standard (UNS) | UNS S31600 | UNS S31603 |
| China GB Standard | 06Cr17Ni12Mo2 | 00Cr17Ni14Mo2 (Old), 022Cr17Ni12Mo2 (New) |
| Japan JIS Standard | SUS316 | SUS316L |
FAQ
Q.Can SS316 and SUS316L be used interchangeably?
A.In non-welding scenarios or different standard projects, they can usually be used interchangeably, but it is not recommended to use SUS316L to replace SS316 for pressure component design
Q.Can SUS316L be used in high temperature environments?
A.Yes, but if it is used in an environment above 600℃ for a long time, it is recommended to consider optimized materials such as 316Ti or 321
