316 vs 316L Stainless Steel
Side-by-side comparison · Composition · Properties · Selection guide
316L is the low-carbon version of 316, with carbon capped at 0.030% instead of 0.08% in commonly referenced specifications. The lower carbon limit reduces sensitization risk in welded construction. Mechanical requirements depend on the product standard, dimensions and condition, while delivered pricing depends on the actual specification, mill route, quantity and procurement date.
Full datasheets:316 Stainless Steel·316L Stainless Steel
At a Glance
| 316 | 316L | |
|---|---|---|
| Type | Austenitic (Mo-bearing) | Austenitic (low carbon, Mo-bearing) |
| UNS | S31600 | S31603 |
| Standard | ASTM A240/A240M | ASTM A240/A240M |
| Density | 7.98 g/cm³ | 7.98 g/cm³ |
Corrosion Resistance and Service Limits
316
- General corrosion resistance comes from the chromium-rich passive film; nickel, molybdenum, nitrogen and copper change performance by grade.
- Check chlorides, temperature, crevices, deposits, process chemistry and cleaning conditions. A grade designation alone is not a service-life guarantee.
316L
- General corrosion resistance comes from the chromium-rich passive film; nickel, molybdenum, nitrogen and copper change performance by grade.
- Check chlorides, temperature, crevices, deposits, process chemistry and cleaning conditions. A grade designation alone is not a service-life guarantee.
Fabrication and Heat Treatment
| Operation | 316 | 316L |
|---|---|---|
| Welding | Generally weldable with a qualified procedure and matching or over-alloyed filler where required; remove heat tint when corrosion service demands it. | Generally weldable with a qualified procedure and matching or over-alloyed filler where required; remove heat tint when corrosion service demands it. |
| Forming | Good ductility is typical, but rapid work hardening increases forming load and springback; bend radius and intermediate annealing depend on grade and reduction. | Good ductility is typical, but rapid work hardening increases forming load and springback; bend radius and intermediate annealing depend on grade and reduction. |
| Machining | Use rigid tooling, positive feeds and controlled heat because the material work-hardens; free-machining grades require separate corrosion and welding review. | Use rigid tooling, positive feeds and controlled heat because the material work-hardens; free-machining grades require separate corrosion and welding review. |
| Heat treatment | Solution annealing and rapid cooling restore the intended condition where applicable. Austenitic grades are not hardened by conventional quench-and-temper treatment. | Solution annealing and rapid cooling restore the intended condition where applicable. Austenitic grades are not hardened by conventional quench-and-temper treatment. |
Chemical Composition (wt%)
| Element | 316 | 316L |
|---|---|---|
| C | ≤0.08 | ≤0.030 |
| Mn | ≤2.00 | ≤2.00 |
| Si | ≤0.75 | ≤0.75 |
| Cr | 16.0–18.0 | 16.0–18.0 |
| Ni | 10.0–14.0 | 10.0–14.0 |
| Mo | 2.00–3.00 | 2.00–3.00 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.030 | ≤0.030 |
Mechanical Properties
| Property | 316 | 316L |
|---|---|---|
| Tensile strength | ≥515 MPa (75 ksi) | ≥485 MPa (70 ksi) |
| Yield strength (0.2%) | ≥205 MPa (30 ksi) | ≥170 MPa (25 ksi) |
| Elongation (50 mm) | ≥40% | ≥40% |
| Hardness | ≤217 HBW | ≤217 HBW |
Which One Should You Choose?
Choose 316 for:
- Unwelded machined components and fasteners
- Designs governed by the slightly higher 316 strength minimums
- High-temperature strength duties where 316H is the real answer
Choose 316L for:
- Welded process piping, tanks and vessels where the design specification calls for low carbon
- Pharmaceutical, food and sanitary equipment governed by a 316L material specification
- Marine fittings assembled by welding
- Any corrosive service left in the as-welded condition
Our verdict
Specify the grade required by the design code, product standard and service conditions. Dual-certified 316/316L may be acceptable only when the ordered material and MTC meet both chemistry and mechanical requirements and the project specification permits both designations. For controlled sanitary, pharmaceutical or class work, write the required designation and inspection document into the purchase order.
Cost and Availability
Compare the current stock position, mill route, minimum production quantity, processing yield, testing and delivered cost for 316 and 316L at quotation time. A fixed price ratio would be misleading because product form, size, condition and market timing can change the commercial result.
Do Not Substitute Without Review
Do not replace 316 with 316L, or the reverse, from the grade name alone. Recheck chemistry, mechanical-property condition, product standard, dimensions, corrosion environment, welding procedure and project approval before substitution.
316 & 316L Products We Export
316L Stainless Steel Sheet
316/316L stainless steel sheet for marine and chemical service, in quotation-confirmed dimensions in 2B, BA and brushed finishes, cut to size, with ordered documentation.
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316L Stainless Steel Seamless Pipe
Seamless 316L stainless steel pipe to ASTM A312, in quotation-confirmed NPS and schedule, pickled and annealed, with ordered documentation — for chemical, marine and process service.
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Frequently Asked Questions
Why do many pharmaceutical specifications call for 316L?
Sanitary systems often include extensive welding and strict surface and cleanliness controls. The lower carbon limit reduces sensitization risk, but the governing design specification, welding procedure, surface acceptance criteria and material certificate still control suitability.
Is there a price difference between 316 and 316L?
There is no fixed premium rule. Product form, dimensions, standard, certification route, quantity, mill allocation and procurement date can all affect the delivered quotation. Compare 316, 316L and permitted dual-certified material on the same specification.
Does 316L always have lower strength?
Not necessarily in delivered commercial material. The specified minimums depend on product standard, thickness and condition; check the actual certificate rather than assuming from carbon suffix alone.
RFQ
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Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.