201
Typical reasons to choose 201
- Household appliances
- Kitchen utensils
- Sinks
- Doors and window components
- Railroad cars
- Higher-strength formed sheet components
Stainless steel grade comparison
201 vs 430 Stainless Steel
Compare 201 and 430 stainless steel by chemistry, microstructure, strength, ductility, corrosion resistance, magnetism, thermal behavior, welding, formability, product forms and relative material cost.
Quick answer:
choose 201 when higher strength, greater elongation
and austenitic forming behavior are important in a mild
service environment. Choose 430 when magnetic response,
lower thermal expansion, higher thermal conductivity
and a nickel-free ferritic alloy provide the better fit
for indoor appliances, kitchen equipment or decorative parts.
The microstructure difference behind the selection
201
EN 1.4372 · UNS S20100
- Structure Austenitic
- Typical Cr 16.1%
- Typical Ni 3.6%
- Typical Mn 6.6%
430
EN 1.4016 · UNS S43000
- Structure Ferritic
- Typical Cr 16.2%
- Nickel Not intentionally alloyed
- Magnetic Yes
Technical basis: Outokumpu Core 201/4372 and Moda 430/4016. Actual purchase chemistry must be verified against the governing specification and MTC.
M03 · Decision summary
201 or 430 stainless steel: which one should you specify?
These grades contain similar chromium levels but behave very differently because 201 is a low-nickel austenitic alloy while 430 is a nickel-free ferritic alloy. The decision should therefore be based on strength, ductility, magnetic requirements, thermal behavior, welding and the actual corrosion environment.
| Decision factor | 201 stainless steel | 430 stainless steel |
|---|---|---|
| Annealed strength |
Substantially higher yield and tensile strength.
Strength advantage |
Lower tensile-strength range in the compared cold-rolled condition. |
| Ductility |
45% cited elongation in the EN cold-rolled condition.
Higher elongation |
20% cited elongation in the same product-form comparison. |
| Magnetic behavior | Normally low magnetic response when annealed, but cold work can increase magnetism. |
Ferritic and magnetizable.
Magnetic |
| Thermal conductivity | 15 W/m·K in the cited room-temperature data. |
25 W/m·K.
Higher conductivity |
| Thermal expansion | Austenitic grade; use grade-specific approved data for design calculations. |
Ferritic 430 has low thermal expansion,
cited at 10 ×10⁻⁶/K from 20–100°C.
Lower expansion |
| Welding |
Weldable using suitable austenitic stainless procedures.
Better starting point |
Standard unstabilized 430 is not normally preferred for welded structures because welding can reduce intergranular-corrosion resistance. |
| Mild indoor applications | Common in appliances, utensils, sinks, doors and formed components. | Very common in kitchen equipment, household appliances, sinks and interior components. |
| Relative alloy cost | Low-nickel chemistry reduces nickel exposure. |
Nickel-free chemistry normally provides the lower
alloy-cost structure.
Cost advantage |
Selection rule: 201 is generally the stronger and more ductile option, while 430 is attractive when ferritic thermal behavior, magnetism and nickel-free alloy economics are useful. Neither should be selected for aggressive chloride or chemical service without a separate corrosion review.
M04 · Technical data
201 vs 430 stainless steel properties
The two grades have similar chromium content, but their mechanical and physical behavior differs strongly because one is austenitic and the other ferritic.
Typical chemical composition
Typical Outokumpu values by mass. Use the applicable material standard and MTC for acceptance.
| Element / feature | 201 / S20100 | 430 / S43000 | Selection significance | Source |
|---|---|---|---|---|
| Carbon | 0.05% | 0.05% | Typical values only; standard limits control purchase acceptance. | Outokumpu typical chemistry |
| Chromium | 16.1% | 16.2% | Chromium levels are very similar, so microstructure and other alloying differences become particularly important. | Outokumpu typical chemistry |
| Nickel | 3.6% | Not intentionally alloyed | Nickel helps maintain the austenitic structure of 201; 430 is a nickel-free ferritic grade. | Outokumpu typical chemistry |
| Manganese | Approx. 6.6% | Standard ferritic level | High manganese is characteristic of the low-nickel Cr-Mn 200-series alloy system. | Outokumpu typical chemistry |
| Nitrogen | 0.08% | Not intentionally increased | Nitrogen contributes to the elevated strength of 201. | Outokumpu typical chemistry |
| Microstructure | Austenitic | Ferritic | This is the main reason for differences in magnetism, ductility and thermal behavior. | Grade classification |
Mechanical properties at 20°C
EN 10088-2 cold-rolled coil and sheet comparison.
| Property | 201 / 1.4372 | 430 / 1.4016 | Interpretation | Condition |
|---|---|---|---|---|
| 0.2% proof strength | 350 MPa | 280 MPa | 201 has the higher minimum proof strength. | Cold-rolled coil / sheet |
| Tensile strength | 680–880 MPa | 430–600 MPa | 201 has a substantially higher tensile-strength range. | Cold-rolled coil / sheet |
| Elongation | 45% | 20% | 201 provides much higher tensile ductility in the cited reference condition. | EN 10088-2 |
| Work hardening | High | Lower than metastable austenitic 201 | 201 gains substantial strength during deformation, but forming loads and springback can increase. | Fabrication behavior |
Typical physical properties
Metric reference values from Outokumpu Core and Moda data. Unavailable 201 values are not estimated.
| Property | 201 | 430 | Why it matters | Condition |
|---|---|---|---|---|
| Density | 7.8 kg/dm³ | 7.7 kg/dm³ | 430 is slightly lower in density. | Reference value |
| Elastic modulus | 200 GPa | 220 GPa | 430 is somewhat stiffer elastically. | 20°C |
| Thermal expansion | Verify for design calculation | 10.0 ×10⁻⁶/K | 430's ferritic structure provides relatively low thermal expansion. | 20–100°C |
| Thermal conductivity | 15 W/m·K | 25 W/m·K | 430 transfers heat significantly more readily. | 20°C |
| Thermal capacity | Verify for design calculation | 460 J/kg·K | Use controlled project data for detailed thermal analysis. | 20°C |
| Electrical resistivity | 0.70 Ω·mm²/m | 0.60 Ω·mm²/m | 430 has the lower electrical resistivity. | 20°C |
| Magnetizable | Normally no* | Yes | 430 is ferritic and magnetic. Cold working may increase magnetic response in 201. | Annealed reference |
Key point:
201 has the mechanical-strength and ductility advantage,
while 430 has the ferritic thermal and magnetic advantages.
These materials should not be treated as direct equivalents
simply because their chromium contents are similar.
M05 · Product form matrix
Product forms and supply routes for 201 and 430
Both grades are strongly associated with flat products. 201 is a high-strength Cr-Mn austenitic sheet alloy, while 430 is one of the most widely used ferritic stainless steels for indoor sheet and strip applications.
Availability note:
this matrix describes common commercial forms,
not current stock. Confirm actual thickness,
width, finish, temper and quantity before ordering.
| Product form / finish | 201 | 430 | Procurement note |
|---|---|---|---|
| Cold-rolled coil & sheet | Common | Common | Major commercial route for both materials. |
| Hot-rolled coil & sheet | Available | Available | Confirm dimensional range with the selected mill. |
| Precision strip | Available | Available | Specify thickness, temper and edge condition. |
| Plate | Hot-rolled route | Verify source | 430 is primarily a coil/sheet/strip grade. |
| Pipe & tube | Application-specific | Application-specific | Neither grade should be assumed available under every tubular standard. |
| 2B / cold-rolled finish | Available | Common | Confirm surface finish and appearance requirements. |
| Bright / decorative finish | Available | Common | 430 is widely used for visible indoor appliance surfaces. |
| Complex welded fabrication | Possible | Review alternative | 439 or 430Ti may be more suitable where ferritic welding is important. |
M06 · Grade selector
Use strength, magnetism and fabrication to choose 201 or 430
Check the conditions that control your component. The result is a preliminary material direction before the exact environment, dimensions, finish and fabrication route are reviewed.
Preliminary result
Start with 201
When strength, ductility and general austenitic fabrication behavior matter more than magnetic or ferritic thermal behavior, 201 is normally the stronger starting point.
STEP 01
Define strength needs
Yield, tensile strength, wall thickness and final deformation.
STEP 02
Check magnetism
Determine whether magnetic attraction is required or undesirable.
STEP 03
Check fabrication
Drawing, stamping, welding, machining and finishing requirements.
STEP 04
Check environment
Indoor, moisture, salts, chemicals and cleaning exposure.
M08 · Applications & limitations
Where 201 works, where 430 makes sense, and where neither is enough
Both grades can appear in appliances, kitchens and formed components, but the reasons for specifying them are different. 201 emphasizes strength and ductility; 430 emphasizes ferritic thermal behavior, magnetism and nickel-free economics.
430
Typical reasons to choose 430
- Kitchen equipment
- Household appliances
- Sinks
- Elevator interior components
- Flanges and valves in mild service
- Magnetic stainless components
!
Conditions requiring another grade review
- Marine or seawater exposure
- Persistent chlorides or salt deposits
- Aggressive chemical processing
- Complex welded ferritic structures
- Applications requiring high pitting resistance
- Special pressure or code-controlled service
Fabrication and functional comparison
The austenitic-versus-ferritic structure affects how the material behaves during forming, welding and service.
| Requirement | 201 | 430 | Selection effect |
|---|---|---|---|
| High strength | Higher proof and tensile strength. | Lower strength in the cited annealed condition. | 201 is normally favored where strength controls the design. |
| Stretch forming | High elongation with strong work hardening. | Lower elongation but useful ferritic formability. | Part geometry and tooling determine which behavior is preferable. |
| Welding | General austenitic welding route available. | Standard unstabilized 430 requires more caution. | Consider 439 or 430Ti when ferritic welded fabrication is required. |
| Magnetic function | Normally low response when annealed. | Magnetic. | 430 is the direct choice where ferritic magnetism is required. |
| Thermal movement | Austenitic thermal behavior. | Lower ferritic thermal expansion. | 430 can reduce thermal movement and welding distortion. |
| Heat transfer | 15 W/m·K cited conductivity. | 25 W/m·K cited conductivity. | 430 transfers heat more readily. |
Important:
430's ferritic structure and nickel-free chemistry do not make it
a universal replacement for 201. Conversely, 201's higher strength
does not make it the correct choice where magnetic function,
low thermal expansion or nickel-free material economics control the design.
Material image comparison
Reserved positions for approved product imagery showing each material option. These blocks can be replaced directly with Media Library images later.
Reserved image position
Use an approved product-form or surface-detail image.
Reserved image position
Use an approved product-form or application image.
M10 · Standards & equivalence
201 and 430 stainless steel grade designations
201 and 430 are not equivalent grades. One is a low-nickel austenitic stainless steel and the other is an unstabilized ferritic stainless steel. Grade substitution therefore changes mechanical, magnetic, thermal and fabrication behavior.
| Designation system | 201 | 430 | Procurement note |
|---|---|---|---|
| ASTM / AISI type | 201 | 430 | Common North American grade designations. |
| UNS | S20100 | S43000 | Use UNS where exact grade identification matters. |
| EN material number | 1.4372 | 1.4016 | European counterparts used in this comparison. |
| Microstructure | Austenitic | Ferritic | This distinction controls many of the practical property differences. |
| Alloy family | Low-nickel Cr-Mn-N | 16% Cr ferritic | Similar chromium content does not mean equivalent behavior. |
| Related alternatives | 201LN / S20153 | 439 / S43035 or 430Ti / 1.4520 | Stabilized ferritic alternatives can provide improved welding and forming behavior versus standard 430. |
ASTM A240/A240M
Common flat-product specification family for Types 201 and 430.
EN 10088-2
Technical delivery conditions for stainless steel flat products.
EN 1.4372
European material number used here for Type 201.
EN 1.4016
European material number used here for Type 430.
Equivalent-looking grade names should never replace the actual purchase specification. Verify chemistry, mechanical condition, dimensions, surface finish, product standard and certificate requirements.
M11 · Direct answers
201 vs 430 stainless steel FAQ
Direct answers to the main purchasing and engineering questions behind the 201 versus 430 decision.
What is the main difference between 201 and 430 stainless steel?
201 is a low-nickel Cr-Mn austenitic stainless steel, while 430 is a nickel-free ferritic stainless steel. This produces major differences in strength, elongation, magnetism, thermal expansion and welding behavior.
Which is stronger, 201 or 430 stainless steel?
In the cited EN cold-rolled condition, 201 is stronger. Its 0.2% proof strength is about 350 MPa compared with 280 MPa for 430, while its tensile range is approximately 680–880 MPa compared with 430–600 MPa.
Which is more ductile, 201 or 430?
201 has much higher cited tensile elongation: approximately 45% compared with 20% for 430 in the referenced cold-rolled EN condition.
Is 430 stainless steel magnetic?
Yes. Type 430 is ferritic and magnetizable. 201 is austenitic and normally has low magnetic response when annealed, although cold working can make 201 noticeably magnetic.
Which has better thermal conductivity?
The cited room-temperature thermal conductivity is approximately 25 W/m·K for 430 and 15 W/m·K for 201. This is one of the characteristic advantages of ferritic stainless steels.
Is 430 cheaper than 201 stainless steel?
430 normally has the lower alloy-cost structure because it contains no intentional nickel addition. 201 already reduces nickel compared with conventional 300-series grades, but it still contains nickel plus higher manganese and nitrogen. Actual quotation price depends on dimensions, finish, quantity and current alloy markets.
Which is better for welding, 201 or 430?
201 is normally the stronger starting point for general welded fabrication. Standard unstabilized 430 requires more caution because welding can reduce intergranular corrosion resistance. Stabilized ferritic grades such as 439 or 430Ti may be better choices when ferritic welding is important.
Which grade is better for household appliances?
Both grades are used in household appliances. 201 is useful when strength and ductility are important, while 430 is particularly common where magnetic behavior, ferritic thermal properties and lower alloy cost are desirable.
Can 201 replace 430 stainless steel?
Not automatically. Although both can be used in mild indoor environments, replacing 430 with 201 changes magnetism, thermal expansion, thermal conductivity, strength, elongation and material cost. The component function must be reviewed first.
M13 · Sources & technical review
Technical basis for this 201 vs 430 comparison
Numeric data is tied to published material condition and product form. Typical chemistry is kept separate from guaranteed purchasing limits.
Primary technical references
- Outokumpu Core Range Datasheet Core 201/4372 chemistry, mechanical properties, physical properties and product forms.
- Outokumpu Core 201/4372 Product Information Low-nickel Cr-Mn chemistry, high work-hardening behavior and typical applications.
- Outokumpu Moda Range Datasheet Moda 430/4016 chemistry, mechanical properties, physical properties, applications and supply forms.
- Outokumpu Moda 430/4016 Product Information Ferritic microstructure, mild-environment use, formability and indoor application guidance.
- EN 10088-2 Mechanical-property reference basis for stainless steel flat products.
- ASTM A240/A240M North American flat-product specification reference for Types 201 and 430.
Page accountability
Editorial author
Stainless Steel Market Technical Editorial Team
Comparison structured around purchasing decisions, grade identity and primary manufacturer technical data.
Technical review basis
Primary datasheet and standards review
Review scope includes chemistry, mechanical properties, physical properties, welding, thermal behavior and product-form selection.
Reviewed
23 September 2026
Technical values checked against current published Outokumpu Core and Moda reference data.
M14 · Ask an engineer
Still deciding between 201 and 430?
Send the application requirements so the grade can be reviewed against strength, forming behavior, magnetism, thermal performance, welding and environment.
- 201, 430 or alternative grade under consideration
- Cold-rolled sheet, coil, strip or other product form
- Thickness, width, length and dimensional tolerance
- Required yield and tensile strength
- Forming depth, stamping or bending requirements
- Whether magnetic behavior is required
- Thermal expansion or conductivity requirements
- Welding or joining requirements
- Indoor, wet, salt or chemical exposure
- Applicable ASTM, EN or customer specification
- Quantity, finish, destination, MTC and inspection requirements
Send your material requirement
Include the component function, strength, magnetic requirement, fabrication process, environment, product form, dimensions, finish, standard and quantity.