Intent: Compare source-specific carbon limits and plate mechanical requirements; the low-carbon grade remains a distinct identity, not an automatic substitute.
Engineering Verdict & When to Choose Each
316 or 316L: a low-carbon grade is a distinct requirement
By Mat Grades Editorial Desk · Updated 2026-11-14
Use the specified low-carbon grade when the fabrication or service requirement calls for it. Do not replace 316 with 316L, or the reverse, solely because the names look close. Compare the actual composition limits, product specification and final condition rather than treating the L suffix as a blanket statement of superiority.
For a welded plate assembly, discuss the thermal route and post-fabrication cleaning with the fabricator. Low carbon does not remove the need for an appropriate procedure, filler, shielding and surface condition. Where the order relies on mechanical minima, confirm the requirements for the grade and product actually being supplied.
For an unwelded machined component, the reason for selecting one variant may be a contractual specification rather than a visible manufacturing difference. Keep that requirement explicit. A certificate covering dual certification must be checked against both ordered specifications; a supplier’s shorthand description is not enough to establish acceptance.
316 Stainless Steel: evidence to check
316 Stainless Steel has 14 cataloged property rows. Elastic Modulus is reported as 200 GPa (typical; further condition not stated). Elastic Modulus is reported as 193 GPa (typical; further condition not stated). The record identifies A240 for Plate; check its scope and ordered edition. These are source-scoped examples rather than unrestricted design allowables. Read the full row context and certificate before using a value for acceptance; an absent value is not zero or a performance failure.
316L Stainless Steel: evidence to check
316L Stainless Steel has 14 cataloged property rows. Elastic Modulus is reported as 200 GPa (typical; further condition not stated). Elastic Modulus is reported as 193 GPa (typical; further condition not stated). The record identifies A240 for Plate; check its scope and ordered edition. These are source-scoped examples rather than unrestricted design allowables. Read the full row context and certificate before using a value for acceptance; an absent value is not zero or a performance failure.
Four questions before approval
- Which product specification and edition are ordered?
- Does the duty include welding or other thermal exposure?
- Are the mechanical minima for the supplied product checked?
- Does any dual certification actually satisfy the order?
Check the linked material records for the complete source trail. Read the methodology before comparing minimum requirements with typical measurements. No direct substitution or qualified fabrication procedure is implied.
Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | 316 Stainless Steel | 316L Stainless Steel |
|---|---|---|
| Material Family | Stainless Steel | Stainless Steel |
| Subfamily | Austenitic | Austenitic |
| TYPE Designation | 316 | 316L |
| UNS Designation | S31600 | S31603 |
| SPECIFICATION Designation | 316 Stainless Steel Engineering Datasheet | 316L Stainless Steel Engineering Datasheet |
| Element | 316 Stainless Steel | 316L Stainless Steel |
|---|---|---|
| C (Carbon) | ≤ 0.08% | ≤ 0.03% |
| Mn (Manganese) | ≤ 2% | ≤ 2% |
| Si (Silicon) | ≤ 0.75% | ≤ 0.75% |
| P (Phosphorus) | ≤ 0.045% | ≤ 0.045% |
| S (Sulfur) | ≤ 0.03% | ≤ 0.03% |
| Cr (Chromium) | 16 – 18% | 16 – 18% |
| Ni (Nickel) | 10 – 14% | 10 – 14% |
| Mo (Molybdenum) | 2 – 3% | 2 – 3% |
| N (Nitrogen) | — | ≤ 0.1% |
| Property | 316 Stainless Steel | 316L Stainless Steel |
|---|---|---|
| Density · TYPICALUnit: g/cm³ | 7.9 g/cm³ | 7.9 g/cm³ |
| Density · TYPICALUnit: g/cm³ | 8 g/cm³ | 8 g/cm³ |
| Elastic Modulus · TYPICALUnit: GPa | 200 GPa | 200 GPa |
| Elastic Modulus · TYPICALUnit: GPa | 193 GPa | 193 GPa |
| Poisson's Ratio · TYPICALUnit: dimensionless | 0.29 dimensionless | 0.29 dimensionless |
| Mechanical Parameter | 316 Stainless SteelASTM requirements at room temperature (producer sheet) | 316L Stainless SteelASTM requirements at room temperature (producer sheet) |
|---|---|---|
| Tensile Strength · Plate · ASTM requirements at room temperature (producer sheet) · MINIMUMUnit: MPa | ≥ 517.1 MPa | ≥ 482.6 MPa |
| Yield Strength · Plate · ASTM requirements at room temperature (producer sheet) · MINIMUMUnit: MPa | ≥ 206.8 MPa | ≥ 172.4 MPa |
| Elongation · Plate · ASTM requirements at room temperature (producer sheet) · MINIMUMUnit: % | ≥ 40 % | ≥ 40 % |
| Property | 316 Stainless Steel | 316L Stainless Steel |
|---|---|---|
| Electrical Resistivity · TYPICAL · 20 °CCategory: ELECTRICAL • Unit: nΩ·m | 740 nΩ·m | 740 nΩ·m |
| Electrical Resistivity · TYPICALCategory: ELECTRICAL • Unit: nΩ·m | 740 nΩ·m | 740 nΩ·m |
| Thermal Conductivity · TYPICAL · 100 °CCategory: THERMAL • Unit: W/(m·K) | 14.6 W/(m·K) | 14.6 W/(m·K) |
| Thermal Conductivity · TYPICAL · 100 °CCategory: THERMAL • Unit: W/(m·K) | 16.3 W/(m·K) | 16.3 W/(m·K) |
| Coefficient of Thermal Expansion · TYPICAL · 100 °CCategory: THERMAL • Unit: µm/(m·K) | 16 µm/(m·K) | 16 µm/(m·K) |
| Hardness Scale | 316 Stainless Steel | 316L Stainless Steel |
|---|---|---|
| HRB Hardness · Plate · ASTM requirements at room temperature (producer sheet) · MAXIMUM | ≤ 95 HRB | ≤ 95 HRB |