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.
1. SS316 vs SUS316L: Different Standard
| SS316 | AISI / ASTM (e.g., ASTM A240) | Medium-carbon Austenitic Stainless Steel (C Less than or equal to 0.08%) | |
| SUS316L | JIS G4303 (Japanese Standard) | Ultra-low carbon Austenitic Stainless Steel (C Less than or equal to 0.03%) |
2. SS316 vs SUS316L: Chemical Composition and Mechanical Properties Comparison
| SS316 (AISI 316) | SUS316L (JIS 316L) | |
|---|---|---|
| Less than or equal to 0.08% | Less than or equal to 0.03% | |
| 10.0–14.0% | 12.0–15.0% | |
| Greater than or equal to 520 MPa | Greater than or equal to 480 MPa | |
| Yield Strength (Rp0.2) | Greater than or equal to 205 MPa | Greater than or equal to 175 MPa |
| Elongation (A5) | Greater than or equal to 40% | Greater than or equal to 40% |
| Less than or equal to 217 | Less than or equal to 187 |
3.SS316 vs SUS316L: Welding Performance and Corrosion Resistance
| SS316 | SUS316L | |
|---|---|---|
| Post-Weld Treatment | ||
| Good, but high risk of heat-affected zone corrosion | ||
4. SS316 vs SUS316L: Application
| SS316 (High Strength Requirement) | SUS316L (High Corrosion/Weldability Requirement) | |
|---|---|---|
| Surgical tool handles, housings (non-implantable) | Bone screws, joint replacements, pacemaker casings (implant-grade materials) | |
| Valves, pump bodies (non-welded components) | ||
| Components not in long-term contact with acidic liquids | ||
| Land-based supports or dry-area fasteners | ||
| Rarely used due to lower hardness, unsuitable for high-wear cutting components |
5. Correspondence with Other Stainless Steel Grades
| SS316 | SUS316L | |
|---|---|---|
| EN 1.4401 | EN 1.4404 | |
| UNS S31600 | UNS S31603 | |
| 06Cr17Ni12Mo2 | 00Cr17Ni14Mo2 (Old), 022Cr17Ni12Mo2 (New) | |
| SUS316 | SUS316L |
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 degree for a long time, it is recommended to consider optimized materials such as 316Ti or 321
