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Stainless steel grade comparison

316 vs 316L Stainless Steel

Compare 316 and 316L stainless steel by carbon content, molybdenum alloying, mechanical properties, weldability, intergranular corrosion resistance, chloride service, product form and certification.

Quick answer: 316 and 316L have essentially the same Cr-Ni-Mo corrosion-resistance alloy balance. Choose 316 when the project specifically requires S31600 or its applicable mechanical properties. Choose 316L when low-carbon chemistry and improved resistance to sensitization after welding are important.

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Normal-carbon CrNiMo vs low-carbon CrNiMo

316

EN 1.4401 · UNS S31600

Structure Austenitic
Typical C 0.04%
Typical Cr 17.2%
Typical Ni 10.1%
Typical Mo 2.1%
PRE ≈24

316L

EN 1.4404 · UNS S31603

Structure Austenitic
Typical C 0.02%
Typical Cr 17.2%
Typical Ni 10.1%
Typical Mo 2.1%
PRE ≈24

Typical manufacturer chemistry. 316L's principal distinction is lower carbon, not additional chromium, nickel or molybdenum. Verify the governing standard and MTC for acceptance.

M03 · Decision summary

316 or 316L stainless steel: which one should you specify?

The corrosion-alloy package is essentially the same. The decision is primarily about carbon, welding and the mechanical-property requirements of the governing standard.

Decision first: use 316 when the drawing, code or purchase specification requires S31600 or 1.4401. Use 316L when welding or other heat input makes resistance to sensitization and intergranular corrosion an important requirement. If dual-certified 316/316L is offered, verify the MTC rather than assuming compliance.

Choose 316

The project specifically requires the normal-carbon grade

Best for Applications specified to UNS S31600 / EN 1.4401, including heat exchangers, flanges, valves and general CrNiMo fabrication.

Not recommended for Replacing an explicit 316L requirement without engineering and specification approval.

Key trade-off Higher permitted carbon can reduce sensitization margin after severe heat exposure.

Alternative 316L where extensive welding or intergranular-corrosion resistance is important.

Choose 316L

Low carbon and welded corrosion performance control

Best for Welded chemical, petrochemical, food, pharmaceutical, pulp and paper and process-industry equipment.

Not recommended for Automatic substitution where the project specifically requires S31600 mechanical or code criteria.

Key trade-off Lower carbon improves sensitization resistance, while some standards give different minimum mechanical values.

Alternative Duplex or higher-alloy stainless steel where chlorides, SCC or localized corrosion exceed the 316L envelope.

Check dual certification

One heat may be certified to both grade requirements

Best approach Review chemistry, mechanical properties, product standard and the actual certificate.

Do not assume Every commercial product sold as “316/316L” is acceptable for every S31600 or S31603 project.

Important EN and ASTM minimum mechanical requirements do not treat the grades identically in every case.

Buyer action Match the MTC directly to the purchase specification.

Engineering reversal conditions: if chloride SCC, warm seawater, strong acids, pressure-code allowables, creep or elevated-temperature service control component life, the real decision may not be 316 versus 316L. A duplex, stabilized, high-alloy or code-specific grade may be required.

M04 · Technical data

316 vs 316L stainless steel properties

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The chemistry comparison looks almost identical until carbon is examined. Mechanical-property differences also depend on whether the procurement basis is EN, ASTM or another product standard.

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Typical chemical composition

Typical manufacturer values by mass. Use the governing standard and material test certificate for final acceptance.

Element / feature	316 / S31600	316L / S31603	Selection significance	Basis
Carbon, C	0.04%	0.02%	The principal distinction. Lower carbon reduces carbide precipitation following heat input.	Typical manufacturer chemistry
Chromium, Cr	17.2%	17.2%	Same cited typical value.	Outokumpu Supra data
Nickel, Ni	10.1%	10.1%	Same cited typical value.	Outokumpu Supra data
Molybdenum, Mo	2.1%	2.1%	Both receive the same basic Mo-driven localized-corrosion advantage.	Outokumpu Supra data
PRE	24	24	Their basic pitting-resistance alloy index is the same.	Outokumpu PRE reference
Microstructure	Austenitic	Austenitic	Broad forming, welding and corrosion behavior is therefore very similar.	Grade classification

EN 10088-2 mechanical properties at 20°C

An important procurement detail: Outokumpu publishes the same EN minimum values for 316/4401 and 316L/4404 in these flat-product conditions.

Product condition	316	316L	Unit / values	Engineering note
Cold rolled coil / sheet	Rp0.2 240 · Rp1.0 270 · Rm 530–680 · A 40%	Rp0.2 240 · Rp1.0 270 · Rm 530–680 · A 40%	MPa / %	No EN minimum-property difference in this condition.
Hot rolled coil / sheet	Rp0.2 220 · Rp1.0 260 · Rm 530–680 · A 40%	Rp0.2 220 · Rp1.0 260 · Rm 530–680 · A 40%	MPa / %	Again identical in the cited EN table.
Quarto plate	Rp0.2 220 · Rp1.0 260 · Rm 520–670 · A 45%	Rp0.2 220 · Rp1.0 260 · Rm 520–670 · A 45%	MPa / %	Carbon difference remains important for heat-affected corrosion behavior.

ASTM A240 minimum mechanical-property comparison

This table explains why a blanket claim that “316 and 316L have identical strength” is not correct across every specification.

Property	316 / S31600	316L / S31603	Condition	Buyer implication
Minimum yield strength	205 MPa	170 MPa	ASTM A240 flat products	Check the required grade and design basis.
Minimum tensile strength	515 MPa	485 MPa	ASTM A240 flat products	ASTM minimums differ even though EN values can be identical.
Minimum elongation	40%	40%	ASTM A240 reference	Same cited minimum elongation.

Welding, sensitization and corrosion behavior

Low carbon becomes most important when thermal exposure can promote chromium-carbide precipitation.

Factor	316	316L	Why it matters	Buyer action
General corrosion	Very good	Very good	Cr, Ni and Mo typical values are essentially identical.	Define actual process medium.
Pitting / crevice resistance	PRE ≈24	PRE ≈24	Low carbon does not significantly increase PRE.	State chloride, temperature, pH and crevice conditions.
Carbide precipitation after heat input	Higher susceptibility	Reduced susceptibility	316L's lower carbon is specifically intended to improve this condition.	Review section thickness and welding procedure.
Intergranular corrosion	More heat-history dependent	Improved resistance after welding	Low carbon extends the time required for sensitization.	Prefer low-carbon material where this mechanism matters.
Thick welded sections	Review required	Preferred low-carbon route	Thicker sections generally increase sensitization concerns.	Specify actual thickness and heat input.
Chloride SCC	Susceptible	Susceptible	Low carbon does not remove austenitic chloride-SCC risk.	Consider duplex where SCC governs.

Typical physical properties

Metric EN 10088-1 reference values. There is no useful physical-property difference for normal grade selection.

Property	316	316L	Condition	Selection significance
Density	8.0 kg/dm³	8.0 kg/dm³	Reference	No difference.
Elastic modulus	200 GPa	200 GPa	20°C	Same cited stiffness.
Thermal expansion	16.0 ×10⁻⁶/K	16.0 ×10⁻⁶/K	20–100°C	Same thermal movement.
Thermal conductivity	15 W/m·K	15 W/m·K	20°C	No selection difference.
Specific heat	500 J/kg·K	500 J/kg·K	20°C	Same reference value.
Electrical resistivity	0.75 Ω·mm²/m	0.75 Ω·mm²/m	20°C	Same reference value.
Magnetizable	No*	No*	Annealed reference	Cold deformation can increase magnetic response.

Important: the phrase “316 is stronger than 316L” is incomplete without naming the standard. Outokumpu's EN 10088-2 flat-product values are identical for 316/4401 and 316L/4404, while ASTM A240 minimum yield and tensile requirements differ.

M05 · Product form matrix

Product forms and supply routes for 316 and 316L

Both grades belong to the widely used molybdenum-alloyed austenitic stainless family. Product form and certification should be confirmed separately from grade chemistry.

Availability note: this matrix describes common product and procurement routes only. It does not represent live inventory. Confirm grade, product standard, dimensions, finish, certification and delivery condition before purchase.

Product / route	316	316L	Status	Procurement note
Cold-rolled coil & sheet	Published product form	Published product form	Typical product form	Confirm gauge, width, finish and standard.
Hot-rolled coil & sheet	Published product form	Published product form	Typical product form	State annealed, pickled and dimensional requirements.
Quarto plate	Published product form	Published product form	Confirm availability	For thick welded plate, low-carbon requirements become especially relevant.
Precision strip	Published product route	Published product route	Supplier-dependent	Confirm width, tolerance, temper and finish.
Welded chemical equipment	Possible after review	Common low-carbon selection	Project-specific	State process medium, temperature and welding details.
Food / pharmaceutical fabrication	Possible	Established application family	Project-specific	Include finish, cleaning and weld-quality requirements.
Pipe / tube	Product-standard dependent	Common product family	Confirm standard	Use the appropriate tube / pipe specification, not flat-product properties.
Bar / machining stock	Available by product program	Available by product program	Confirm availability	Confirm EN 10088-3, ASTM A276 / A479 or project-specific standard.
316 / 316L dual-certified material	Possible	Possible	Verify MTC	Acceptance requires actual certificate compliance with project requirements.

M08 · Applications & limitations

Where 316 works, where 316L is preferred, and where neither grade is sufficient

Discuss Your Application

Both grades provide the same basic Cr-Ni-Mo corrosion-resistance package. 316L becomes the stronger candidate when welding heat input and intergranular-corrosion resistance are important.

316

Typical reasons to choose 316

Projects explicitly specifying S31600
Heat exchangers
Flanges and valves
General corrosion-resistant fabrication
Strength-controlled ASTM applications
Temper-rolled high-strength products

316L

Typical reasons to choose 316L

Chemical industry equipment
Petrochemical equipment
Pulp and paper equipment
Food and beverage equipment
Pharmaceutical equipment
Medical applications
Welded process equipment

Review

Conditions that can require another alloy

Warm seawater or highly concentrated chlorides
Severe crevice corrosion conditions
Chloride SCC risk
Strong hydrochloric or reducing-acid service
High-temperature creep-controlled service
Very high pitting-resistance requirement
Critical pressure-code applications

Failure modes that can reverse the recommendation

Carbide precipitation during welding

Heat input can promote chromium-rich carbide precipitation at grain boundaries. 316L's lower carbon content reduces this tendency and extends the time required for significant sensitization.

Intergranular corrosion

Welding thick sections, thermal exposure within roughly 550–850°C and slow cooling can increase sensitization risk. Low-carbon grades provide better resistance after such operations.

Chloride pitting

Both grades contain approximately the same chromium and molybdenum and therefore have essentially the same basic PRE. 316L is not inherently a higher-PRE alloy than 316.

Crevice corrosion

Stagnant chloride solutions, gaskets, deposits and restricted oxygen transport can cause crevice corrosion in both grades. Low carbon does not eliminate this localized-corrosion mechanism.

Chloride stress-corrosion cracking

Both 316 and 316L are austenitic and remain susceptible to chloride-induced SCC. Outokumpu notes critical combinations of tensile stress, chlorides and temperatures above about 50°C. Duplex or ferritic alternatives may be preferred where SCC resistance controls.

Weld heat tint and surface contamination

Choosing 316L does not eliminate the need for good weld finishing. Heat tint and contamination can reduce local corrosion performance, so cleaning, pickling or passivation may still be required.

Assuming 316L is always weaker

This statement depends on the standard. ASTM A240 gives lower minimum yield and tensile values for 316L, but Outokumpu's EN 10088-2 flat-product values are identical for 316 and 316L.

Assuming dual-certified material is automatically acceptable

Dual-certified 316/316L material is commercially common in some product forms, but approval depends on the actual certificate, governing specification and project acceptance criteria.

Inspection guidance: for welded 316/316L equipment, check heat tint, crevices, deposits, weld quality and localized corrosion. For dual-certified procurement, match the actual chemistry and mechanical properties on the MTC to the purchase specification.

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316 stainless steel

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316L stainless steel

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M10 · Standards & equivalence

316 and 316L stainless steel grade designations

The grades are closely related, but their UNS and EN designations remain distinct. Always match chemistry, mechanical properties and product standard to the purchase specification.

Designation / standard	316	316L	Procurement caveat
ASTM / AISI type	316	316L	The L suffix identifies the low-carbon grade.
UNS	S31600	S31603	Use the exact UNS for grade identification.
EN material number	1.4401	1.4404	Related alloys, but distinct material numbers.
EN name	X5CrNiMo17-12-2	X2CrNiMo17-12-2	The carbon designation reflects the principal difference.
JIS	SUS316	SUS316L	Verify the applicable JIS product standard.
GB reference	Verify against current project standard	Verify against current project standard	Do not rely on informal equivalence tables.
ASTM A240/A240M	Flat-product grade	Flat-product grade	Minimum mechanical requirements differ.
EN 10088-2	Flat-product reference	Flat-product reference	Published EN flat-product minimum values can be identical.
EN 10088-3	Long-product reference	Long-product reference	Use for applicable bar and long-product procurement.
Dual certification	Possible	Possible	Acceptance requires actual certificate verification.

316 · S31600 Normal-carbon molybdenum-alloyed austenitic stainless steel.

316L · S31603 Low-carbon CrNiMo counterpart for improved resistance to sensitization.

316 · 1.4401 EN designation X5CrNiMo17-12-2.

316L · 1.4404 EN designation X2CrNiMo17-12-2.

The exact standard matters. Do not infer mechanical equivalence from similar chemistry alone, and do not accept a dual-certified designation without checking the MTC and project acceptance criteria.

M11 · Direct answers

316 vs 316L stainless steel FAQ

Direct answers to common engineering and purchasing questions about 316 versus 316L stainless steel.

What is the main difference between 316 and 316L stainless steel?

The main difference is carbon content. Outokumpu typical values are about 0.04% carbon for 316 and 0.02% for 316L. Their typical chromium, nickel and molybdenum contents are otherwise the same in this comparison.

Does 316L have better corrosion resistance than 316?

In the solution-annealed condition, their basic general and pitting-corrosion resistance is very similar because their Cr, Ni and Mo alloy balance is essentially the same. 316L has an advantage after sensitizing heat exposure because its lower carbon reduces carbide precipitation.

Which is better for welding, 316 or 316L?

316L is commonly preferred for significant welded fabrication. Its lower carbon content reduces sensitization and improves resistance to intergranular corrosion after welding.

Is 316 stronger than 316L?

It depends on the specification. ASTM A240 minimum values are higher for 316 than for 316L. However, Outokumpu's EN 10088-2 minimum values for cold-rolled, hot-rolled and quarto plate are identical for 316 and 316L.

Do 316 and 316L have the same molybdenum content?

In the Outokumpu 1.4401 / 1.4404 typical chemistry used here, both contain approximately 2.1% molybdenum. Their PRE is also approximately 24.

What does dual-certified 316/316L mean?

It refers to material certified to satisfy the applicable requirements for both 316 and 316L. Dual-certified products are commercially available, but the actual MTC and project specification must be checked before acceptance.

Is 316L immune to chloride stress-corrosion cracking?

No. Both are austenitic stainless steels. Combinations of tensile stress, chloride solution and elevated temperature can cause chloride SCC. Where SCC resistance is critical, a duplex or another alloy family may be more suitable.

Can I automatically replace 316 with 316L?

No automatic substitution should be assumed. Check the governing material standard, mechanical-property requirements, code rules and MTC. This is especially important because ASTM minimum mechanical requirements for the two grades differ.

M13 · Sources & technical review

Technical basis for this 316 vs 316L comparison

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This page separates alloy chemistry, product-standard mechanical requirements, weld sensitization and localized-corrosion behavior instead of treating the L suffix as a universal performance upgrade.

Primary technical references

Outokumpu Supra Range Datasheet 316/4401 and 316L/4404 chemistry, PRE, EN and ASTM mechanical properties, physical data, corrosion, fabrication and product-form guidance.
Outokumpu Supra 316/4401 Normal-carbon CrNiMo austenitic stainless steel, heat exchanger, flange and valve application guidance.
Outokumpu Supra 316L/4404 Low-carbon alternative, reduced carbide precipitation and improved intergranular-corrosion resistance after welding.
ASTM A240/A240M Plate, sheet and strip minimum mechanical-property framework.
EN 10088-1 Grade and physical-property reference framework.
EN 10088-2 Flat-product mechanical and technical-delivery reference.
Alleima 316/316L technical data Confirms S31600 / S31603, 1.4401 / 1.4404, EN names and product-standard mappings.
Product-specific MTC / MTR Required to confirm actual heat chemistry, mechanical properties and dual-certification status.

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M14 · Ask an engineer

Still deciding between 316 and 316L?

Send the actual material standard, welding details, corrosion environment and certification requirements so the grade can be reviewed against the finished component.

316, 316L or dual-certified 316/316L under consideration
UNS S31600 or S31603 requirement
EN 1.4401 or 1.4404 requirement
Sheet, coil, strip, plate, tube, pipe, bar or fabricated component
Thickness, width, diameter and dimensional tolerance
Required yield and tensile properties
ASTM, EN, ASME or customer specification
Welding process and joint configuration
Section thickness and expected heat input
As-welded corrosion requirement
Pickling, cleaning or passivation requirement
Chloride concentration and process chemistry
Normal and peak operating temperature
Tensile stress / SCC concern
Surface finish
Dual-certification requirement
Quantity, destination and due date
MTC, inspection and documentation requirement

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