201
Typical reasons to choose 201
- Household appliances
- Kitchen utensils
- Sinks in suitable environments
- Doors and window components
- Railroad cars
- High-strength formed sheet parts
Stainless steel grade comparison
201 vs 310S Stainless Steel
Compare 201 and 310S stainless steel by chemistry, room-temperature strength, oxidation resistance, high-temperature capability, creep behavior, formability, welding, thermal properties, product forms and procurement cost.
Quick answer:
choose 201 for high-strength formed components in
mild room-temperature service when low nickel content
and strong work hardening provide a practical advantage.
Choose 310S for furnace, boiler and hot-gas components
where oxidation, carburization and sustained temperatures
approaching 1050°C control material selection.
The alloy strategy behind the decision
201
EN 1.4372 · UNS S20100
- Structure Austenitic
- Typical Cr 16.1%
- Typical Ni 3.6%
- Typical Mn 6.6%
- Main role Strength + forming
310S
EN 1.4845 · UNS S31008
- Structure Austenitic
- Typical Cr 25.5%
- Typical Ni 19.1%
- Air service guide 1050°C
- Main role Heat resistance
Technical basis: Outokumpu Core 201/4372 and Therma 310S/4845. Maximum temperature is guidance for appropriate high-temperature service and must not be treated as a universal allowable temperature.
M03 · Decision summary
201 or 310S stainless steel: which one should you specify?
These grades are both austenitic stainless steels, but they solve very different engineering problems. 201 focuses on room-temperature strength and economical formed products. 310S focuses on oxidation resistance, creep behavior and high-temperature equipment.
Decision first:
if the component remains near room temperature,
310S is usually an unnecessarily expensive way to solve
a strength or forming requirement. If the component must
operate above roughly 550°C, especially in furnace or
hot-gas service, 201 should not be treated as a lower-cost
substitute for a dedicated heat-resistant alloy.
Best for 201
High-strength formed products
Use 201 where high proof strength, strong work hardening, sheet forming and lower nickel exposure provide a measurable benefit.
Best for 310S
Furnace and hot-gas equipment
Use 310S where high-temperature oxidation, carburization resistance and sustained elevated-temperature mechanical behavior control service life.
Recommendation reverser
Atmosphere can override temperature
Sulfur compounds, halogens, molten salts, carburizing conditions and thermal cycling can change the usable temperature of 310S.
| Decision factor | 201 stainless steel | 310S stainless steel |
|---|---|---|
| Room-temperature strength |
High proof and tensile strength.
Strength advantage |
Good annealed strength but normally selected for high-temperature duty. |
| High-temperature oxidation | Not a dedicated heat-resistant grade. |
Very high chromium and nickel contents
support strong oxidation resistance.
Clear advantage |
| Air-service guidance | Do not assign a 310S-style temperature rating. |
Approximately 1050°C,
subject to atmosphere, stress and cycling.
High-temperature grade |
| Carburizing service | Not selected specifically for carburization resistance. |
High Ni-Cr chemistry gives useful resistance
to carburizing environments.
Preferred |
| Sheet forming |
High ductility and strong work hardening.
Economic forming choice |
Good formability, but high alloy cost usually requires a thermal justification. |
| Welding | Weldable using suitable procedures. | Weldable by common arc processes, but hot-cracking control and heat input require attention. |
| Room-temperature wet service | Suitable for selected mild environments. | High Cr-Ni chemistry provides corrosion resistance, but 310S is optimized primarily for heat, not economical aqueous-corrosion service. |
| Relative alloy cost |
Low nickel content normally lowers
alloy surcharge exposure.
Cost advantage |
Approximately 25% Cr and 19% Ni create a much higher alloy-cost structure. |
Selection rule:
buy 310S because the operating environment requires
a heat-resistant alloy—not because 310S simply appears
to be a “higher” stainless grade than 201.
M04 · Technical data
201 vs 310S stainless steel properties
201 and 310S are optimized for different conditions. 201 values below represent common cold-rolled flat-product references; 310S room-temperature figures are typical annealed-sheet data. High-temperature 310S design must then use temperature-dependent strength and creep data.
Typical chemical composition
Manufacturer typical values by mass. Actual heat acceptance is controlled by the governing specification and MTC.
| Element / feature | 201 / S20100 | 310S / S31008 | Selection significance | Basis |
|---|---|---|---|---|
| Carbon, C | 0.05% | 0.05% | Typical values are similar, but alloy intent is completely different. | Manufacturer typical chemistry |
| Chromium, Cr | 16.1% | 25.5% | 310S contains dramatically more chromium, which supports protective scale formation at elevated temperature. | Outokumpu typical chemistry |
| Nickel, Ni | 3.6% | 19.1% | High nickel is central to 310S high-temperature austenitic stability and carburization performance. | Outokumpu typical chemistry |
| Manganese, Mn | 6.6% | Approx. conventional Cr-Ni level | 201 replaces part of the nickel with manganese as part of its lower-cost Cr-Mn alloy strategy. | Grade design |
| Nitrogen, N | 0.08% | Not a primary alloying feature | Nitrogen contributes to 201's high room-temperature strength. | Manufacturer typical chemistry |
| Silicon, Si | Standard Cr-Mn level | Approx. 0.5% | 310S performance comes primarily from its very high Cr-Ni content rather than a high-silicon alloy strategy. | Outokumpu typical chemistry |
Room-temperature mechanical properties
201 values are EN cold-rolled flat-product references. 310S values are typical annealed-sheet data. They are shown with condition labels to avoid false equivalence.
| Property | 201 | 310S | Condition | Interpretation |
|---|---|---|---|---|
| 0.2% proof strength | 350 MPa | Approx. 290 MPa typical |
201: EN cold-rolled sheet 310S: annealed sheet |
201 provides the higher room-temperature proof strength in these published references. |
| 1.0% proof strength | 380 MPa | Use project specification | Product-condition dependent | Do not estimate an unavailable value for a purchasing decision. |
| Tensile strength | 680–880 MPa | Approx. 610 MPa typical | Different published product conditions | 201 has the stronger room-temperature strength focus. |
| Elongation | 45% | Approx. 42% | Annealed references | Both retain substantial austenitic ductility. |
| Work hardening | High | Austenitic work-hardening behavior | Fabrication dependent | 201 is specifically notable for its high work-hardening coefficient. |
310S elevated-temperature design indicators
201 is not assigned equivalent values here because it is not being presented as a heat-resistant substitute.
| Temperature / property | 201 | 310S | Data type | Engineering meaning |
|---|---|---|---|---|
| Maximum application temperature | Not assigned | 1050°C | Air-service guidance | Not an automatic allowable design temperature. |
| Rp0.2 at 600°C | Use approved project data | 170 MPa minimum reference | Elevated-temperature yield | Used for design screening below the creep-dominated regime. |
| Rp0.2 at 700°C | Not established here | 80 MPa minimum reference | Elevated-temperature yield | Strength falls substantially as service temperature rises. |
| Rp0.2 at 800°C | Not established here | 35 MPa minimum reference | Elevated-temperature yield | Creep increasingly controls long-duration design. |
| Rp0.2 at 900°C | Not established here | 15 MPa minimum reference | Elevated-temperature yield | Room-temperature tensile numbers become poor indicators of actual component capability. |
| 100,000 h creep rupture at 600°C | Not established here | Approx. 100 MPa mean | Long-term creep reference | Long-duration load requires creep-based design. |
| 100,000 h creep rupture at 800°C | Not established here | Approx. 18 MPa mean | Long-term creep reference | Demonstrates the strong temperature dependence of long-term allowable stress. |
| 100,000 h creep rupture at 900°C | Not established here | Approx. 10 MPa mean | Long-term creep reference | Section thickness and applied stress become critical at extreme temperature. |
Typical physical properties
Use approved design data for thermal calculations and thermal-expansion allowance.
| Property | 201 | 310S | Condition | Selection effect |
|---|---|---|---|---|
| Density | 7.8 kg/dm³ | 7.8 kg/dm³ | 20°C reference | Essentially identical. |
| Elastic modulus | 200 GPa | 196 GPa | 20°C | Very similar room-temperature stiffness. |
| Thermal conductivity | 15 W/m·K | 15 W/m·K | 20°C | Same cited room-temperature value. |
| 310S thermal conductivity at 500°C | Use project data | 19 W/m·K | 500°C | Heat-transfer properties change with temperature. |
| 310S thermal conductivity at 800°C | Use project data | 24 W/m·K | 800°C | Required for thermal-gradient calculations. |
| Mean thermal expansion | Verify for project calculation | 18.8 ×10⁻⁶/K | 20–600°C for 310S | Expansion allowances are essential in high-temperature assemblies. |
| Mean thermal expansion | Verify for project calculation | 20.0 ×10⁻⁶/K | 20–1000°C for 310S | Large temperature excursions create significant dimensional movement. |
| Specific heat | Use approved project value | 472 J/kg·K | 20°C | Relevant to thermal-response calculations. |
| Electrical resistivity | 0.70 Ω·mm²/m | 0.96 Ω·mm²/m | 20°C | 310S has the higher cited resistivity. |
Critical comparison rule:
a 201 room-temperature tensile value cannot establish
suitability for furnace service. Above roughly 550°C,
oxidation, high-temperature corrosion, creep,
thermal fatigue and structural stability increasingly
control the material decision.
M05 · Product form matrix
Product forms and supply routes for 201 and 310S
201 is strongly associated with economical flat products and formed sheet components. 310S is available in flat products and plate for high-temperature fabrication, while specialist tubular or fabricated forms should be confirmed against the exact project standard.
Availability note:
the table describes typical commercial product routes.
It does not claim live inventory.
Confirm thickness, width, finish, quantity,
heat treatment and certification before ordering.
| Product form / condition | 201 | 310S | Procurement note |
|---|---|---|---|
| Cold-rolled coil & sheet | Common | Available | Established supply route for both grades. |
| Hot-rolled coil & sheet | Available | Available | Confirm annealed/pickled condition and finish. |
| Quarto plate | Verify mill route | Common route | 310S plate is relevant to furnace and heavy thermal fabrication. |
| Precision strip | Available | Confirm program | Gauge and width range depend on mill route. |
| 2B / 2D finish | Available | Available | Finish should match downstream fabrication and appearance requirements. |
| Pipe / tube | Specification-dependent | Specialist route | Confirm exact tubular standard, OD, wall and heat-treatment condition. |
| Furnace components | Not intended | Typical application | Temperature, atmosphere and mechanical load must be supplied. |
| Expansion bellows / hot fabricated parts | Not heat-duty choice | Relevant | Thermal cycling and weld design become critical. |
M06 · Grade selector
Use temperature, atmosphere and load to choose 201 or 310S
Check the conditions controlling component life. For this comparison, high-temperature atmosphere and time-at-temperature can outweigh room-temperature tensile properties.
Preliminary result
Start with 201
If the component is a normal-temperature formed part and high-temperature oxidation or creep is not a requirement, 201 is usually the more economical starting point.
Send Conditions to an Engineer
STEP 01
Define temperature
Normal, peak and continuous service temperatures.
STEP 02
Define atmosphere
Air, combustion gas, sulfur, carbon, nitrogen, halogens or salts.
STEP 03
Define loading
Static load, creep, thermal fatigue, vibration and cycling.
STEP 04
Confirm fabrication
Sheet forming, welding, plate fabrication and final heat treatment.
M08 · Applications & limitations
Where 201 works, where 310S is justified, and where another alloy may be safer
The correct application is controlled by the failure mechanism. 201 is normally selected for economical strength and forming. 310S is normally selected to manage high-temperature oxidation, carburization, creep and thermal exposure.
310S
Typical reasons to choose 310S
- Industrial furnace components
- Boiler components
- Heat treatment baskets
- Heat exchangers
- Thermowells
- Expansion bellows
- Hot exhaust systems and manifolds
!
Conditions requiring another alloy review
- Very severe sulfur-containing hot gases
- Molten chlorides or aggressive salts
- Strong halogen-bearing atmospheres
- Extreme thermal cycling
- Very high long-term creep loading
- Applications above the verified 310S design envelope
Failure modes that can reverse the recommendation
Why can 201 fail in high-temperature service?
201 is optimized for room-temperature strength
and forming rather than stable protective scale,
high-temperature corrosion resistance or long-term
creep strength. A strong room-temperature tensile
result does not prove furnace suitability.
Can 310S really operate at 1050°C?
1050°C is a material-selection guide under
appropriate atmospheric conditions.
Actual allowable temperature depends on
stress, duration, atmosphere, thermal cycling,
section size and required component life.
How does sulfur affect 310S?
Sulfur-bearing atmospheres can substantially
reduce usable temperature. Published manufacturer
guidance shows that elevated sulfur concentration
can lower the practical temperature limit well
below the nominal air-service figure.
What is sigma-phase embrittlement?
Long exposure in intermediate high-temperature
ranges can allow intermetallic phases such as
sigma phase to form. This can reduce room-temperature
toughness and ductility after ageing.
Why does thermal cycling matter?
Start-ups and shut-downs create changing
temperature gradients, thermal expansion and stress.
The result can be low-cycle or thermo-mechanical
fatigue even when oxidation resistance remains acceptable.
Is 310S automatically best for wet corrosion?
No. 310S is optimized primarily for
high-temperature service. Wet process corrosion,
chlorides, acids and crevice conditions should be
evaluated independently.
Important:
the 310S premium should solve a real
high-temperature problem. If the component never
operates at meaningful elevated temperature,
a lower-alloy stainless grade may provide a more
economic solution.
Material image comparison
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M10 · Standards & equivalence
201 and 310S stainless steel grade designations
Both materials are austenitic, but they are not equivalent. 201 belongs to the low-nickel Cr-Mn family, while 310S belongs to the high Cr-Ni heat-resistant stainless family.
| Designation system | 201 | 310S | Procurement note |
|---|---|---|---|
| ASTM / AISI type | 201 | 310S | Common North American grade names. |
| UNS | S20100 | S31008 | Use UNS when exact alloy identification is required. |
| EN material number | 1.4372 | 1.4845 | European material-number references used on this page. |
| Microstructure | Austenitic | Austenitic | Same broad structure does not imply equivalent temperature capability. |
| Alloy family | Low-Ni Cr-Mn-N | High Cr-Ni heat-resistant | The alloys are optimized for different service mechanisms. |
| ASTM A240/A240M | Relevant flat-product family | 310S designation used in flat-product procurement | Confirm current revision, form, thickness and acceptance requirements. |
| EN 10088-2 | Common flat-product reference | Not the only high-temperature design basis | 201 room-temperature flat-product properties are commonly referenced here. |
| EN 10095 | Not the primary 201 service standard | Heat-resistant steel reference | Relevant to elevated-temperature 310S service guidance. |
| EN 10028-7 | Project-dependent | Source for selected elevated-temperature values | Use the actual project/product standard for design. |
| JIS / GB mapping | Confirm against purchase standard | Confirm against purchase standard | Do not publish an automatic cross-standard equivalence unless chemistry, properties, product form and revision are verified. |
ASTM A240/A240M
Flat-product procurement reference;
verify current edition and product condition.
EN 10088-2
Common room-temperature stainless
flat-product delivery reference.
EN 10095
Important reference family for
heat-resistant stainless steels.
MTC / certificate
Verify actual chemistry, mechanical condition,
heat number and governing standard.
Equivalent-looking designations do not establish interchangeability. For 310S in particular, the operating temperature, atmosphere and long-term creep requirement must remain part of the specification.
M11 · Direct answers
201 vs 310S stainless steel FAQ
Direct answers to the main purchasing and engineering questions behind the 201 versus 310S decision.
What is the main difference between 201 and 310S stainless steel?
201 is a low-nickel Cr-Mn austenitic stainless steel optimized for high room-temperature strength and forming. 310S is a high-chromium, high-nickel heat-resistant austenitic stainless steel optimized for oxidation, carburization resistance and elevated-temperature service.
Which is stronger at room temperature?
201 has the stronger room-temperature strength focus. The cited cold-rolled 201 reference has about 350 MPa proof strength and 680–880 MPa tensile strength, while typical annealed 310S data is around 290 MPa proof strength and 610 MPa tensile strength. The product conditions are not identical, so the values must remain condition-labelled.
Which grade is better at 1000°C?
310S is the relevant choice between these two grades. It is specifically designed for high-temperature oxidation and creep service and has published air-service guidance up to approximately 1050°C.
Can 201 replace 310S in a furnace?
Not on the basis of room-temperature strength. Furnace components must be evaluated for oxidation, hot-gas corrosion, creep, thermal fatigue, atmosphere chemistry and exposure time. 201 is not a direct heat-resistant substitute for 310S.
Is 1050°C the guaranteed operating temperature of 310S?
No. It is material-selection guidance under suitable conditions. Stress, duration, section thickness, thermal cycling and atmosphere chemistry can lower the practical allowable temperature.
How does sulfur affect 310S temperature capability?
Sulfur-containing gases can be much more aggressive than clean air. Published manufacturer guidance shows that higher sulfur concentrations can reduce the recommended maximum service temperature considerably, so sulfur level should be included in the material review.
Can 310S be welded?
Yes. 310S can be welded using common arc-welding processes with suitable filler and procedure control. Because fully austenitic heat-resistant weld metal can be susceptible to hot cracking, heat input, joint design and interpass temperature should be controlled.
Why is 310S more expensive than 201?
310S contains roughly 25% chromium and 19% nickel, while 201 intentionally uses much less nickel and more manganese. That creates a substantially different alloy-cost structure. The extra cost is normally justified by a real high-temperature performance requirement.
M13 · Sources & technical review
Technical basis for this 201 vs 310S comparison
This page separates room-temperature data from high-temperature design data and keeps atmosphere, creep and ageing conditions visible so the 1050°C material guidance is not misread as an unconditional operating limit.
Primary technical references
- Outokumpu Core Range Datasheet 201/4372 chemistry, mechanical properties, physical properties, product forms and application guidance.
- Outokumpu Core 201/4372 Product Information Low-nickel Cr-Mn chemistry, high mechanical strength and work-hardening behavior.
- Outokumpu Therma Range Datasheet 310S/4845 chemistry, maximum air-service guidance, elevated-temperature yield strength, creep rupture data, thermal properties and structural-stability guidance.
- Aperam 310S Technical Datasheet Independent manufacturer reference for 310S annealed-sheet mechanical properties, 1050°C continuous service guidance, sulfur effects, forming and welding.
- EN 10095 Heat-resistant stainless steel service reference.
- EN 10028-7 Reference basis for selected elevated-temperature mechanical values.
- ASTM A240/A240M Flat-product material specification reference relevant to procurement.
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Update note
Initial T09 201 vs 310S comparison prepared with condition-specific room-temperature data, elevated-temperature strength, creep data, atmosphere warnings, grade selector and RFQ structure.
M14 · Ask an engineer
Still deciding between 201 and 310S?
Send the real operating temperature, atmosphere, applied load and fabrication requirements so the material can be reviewed against both room-temperature needs and high-temperature failure mechanisms.
- 201, 310S or alternative grade under consideration
- Normal operating temperature
- Peak operating temperature
- Time at peak temperature
- Continuous or cyclic operation
- Air, combustion gas, carburizing or nitriding atmosphere
- Sulfur content or sulfur-bearing gas exposure
- Halogens, salts or process deposits
- Static load and creep requirement
- Thermal fatigue / start-stop cycle
- Sheet, coil, plate, pipe, tube or fabricated form
- Thickness, dimensions and tolerances
- Welding process and filler requirement
- Applicable ASTM, EN or customer specification
- Quantity, destination, delivery date and MTC requirement
Send your material requirement
For high-temperature service, do not send temperature alone. Include atmosphere, duration, load, thermal cycling, product form, dimensions, welding and required service life.