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Compare 304 and 430 stainless steel by chemistry, microstructure, corrosion resistance, mechanical properties, thermal behavior, magnetism, weldability, machinability, product forms, applications and relative procurement cost.
The structural difference behind the selection decision
Typical chemistry and physical-property basis: Outokumpu Core 304/4301 and Moda 430/4016. *Cold work can increase the magnetic response of 304.
The main decision is not simply strength. 304 is an austenitic Cr-Ni grade with broader corrosion resistance, ductility and welding capability. 430 is a nickel-free ferritic grade optimized for mildly corrosive environments where magnetic behavior, thermal stability and material economy can be more important.
| Decision factor | 304 stainless steel | 430 stainless steel |
|---|---|---|
| General corrosion resistance |
Better overall corrosion resistance and broader
indoor / outdoor application range.
Preferred |
Good in mildly corrosive environments, especially indoor service, but with less corrosion margin than 304. |
| Indoor appliances | Widely used where corrosion resistance and fabrication flexibility justify the higher alloy cost. |
Very common for household appliances, kitchen equipment,
sinks and decorative indoor parts.
Strong value |
| Magnetism | Normally low magnetic response in annealed condition, although cold working may increase magnetism. |
Ferritic and magnetizable.
Magnetic |
| Welding |
Excellent weldability using conventional stainless-steel
welding processes.
Preferred |
Standard unstabilized 430 is less suitable for welded structures because welding can reduce intergranular corrosion resistance. |
| Formability | High ductility and excellent stretch-forming capability. | Good formability for many drawing and forming operations, but less elongation than 304. |
| Machinability | Austenitic structure work-hardens and generally requires more controlled machining practice. |
Ferritic stainless steels are generally easier to machine
than standard austenitic grades.
Easier machining |
| Thermal behavior | Higher thermal expansion and lower thermal conductivity. |
Lower thermal expansion and higher thermal conductivity.
Thermal advantage |
| Relative alloy cost | Higher because of the substantial nickel content. |
Nickel-free chemistry typically provides a lower and
less nickel-sensitive alloy-cost position.
Cost advantage |
Selection rule: 430 can be an efficient alternative where the environment is genuinely mild, but it should not be treated as a direct low-cost replacement for 304 in welded, coastal, chemical or corrosion-sensitive service.
The values below use the same grade families and clearly state whether they are manufacturer typical chemistry, EN mechanical requirements or EN physical-property reference values.
Typical Outokumpu composition by mass. These values are not a substitute for the governing specification or MTC.
| Property | 304 / 1.4301 | 430 / 1.4016 | Selection significance | Source / condition |
|---|---|---|---|---|
| Carbon | 0.04% | 0.05% | Exact maximum limits depend on the governing standard. | Outokumpu typical chemistry |
| Chromium | 18.1% | 16.2% | 304's higher chromium level contributes to its broader general corrosion resistance. | Outokumpu typical chemistry |
| Nickel | 8.1% | Not intentionally alloyed | Nickel stabilizes the austenitic structure of 304. The nickel-free 430 chemistry reduces alloy-cost exposure. | Outokumpu typical chemistry |
| PRE | Approx. 18 | Approx. 16 | A useful alloy-composition indicator, but not a complete prediction of real service corrosion performance. | Outokumpu grade-range data |
| Microstructure | Austenitic | Ferritic | Drives major differences in magnetic behavior, thermal expansion, toughness and work hardening. | Grade-family classification |
EN 10088-2 cold-rolled coil / sheet comparison. Values for another thickness or product form should be checked separately.
| Property | 304 / 1.4301 | 430 / 1.4016 | Procurement interpretation | Condition |
|---|---|---|---|---|
| 0.2% proof strength | 230 MPa | 280 MPa | 430 has the higher minimum proof strength in the compared cold-rolled condition. | EN 10088-2, cold-rolled coil/sheet |
| Tensile strength | 540–750 MPa | 430–600 MPa | 304 has the higher tensile-strength range. | EN 10088-2, cold-rolled coil/sheet |
| Elongation | 45% | 20% | 304 provides much higher tensile ductility, which supports demanding forming operations. | EN 10088-2 |
Metric reference values from EN 10088-1 / Outokumpu datasheets.
| Property | 304 | 430 | Why it matters | Condition |
|---|---|---|---|---|
| Density | 7.9 kg/dm³ | 7.7 kg/dm³ | 430 is slightly lower in density. | Typical physical property |
| Elastic modulus | 200 GPa | 220 GPa | 430 is somewhat stiffer elastically. | 20°C |
| Thermal expansion | 16.0 ×10⁻⁶/K | 10.0 ×10⁻⁶/K | 430 expands substantially less during heating. | 20–100°C |
| Thermal conductivity | 15 W/m·K | 25 W/m·K | 430 transfers heat more readily than 304. | 20°C |
| Specific heat | 500 J/kg·K | 460 J/kg·K | Relevant to heating and thermal-cycle calculations. | 20°C |
| Electrical resistivity | 0.73 Ω·mm²/m | 0.60 Ω·mm²/m | 430 has lower electrical resistivity. | 20°C |
| Magnetizable | Normally no | Yes | Magnetic requirements can immediately determine the grade family. | Annealed reference condition |
304 is available in a broader range of general industrial product forms. 430 is especially common as sheet, coil and strip for appliances, kitchen equipment and formed components.
| Product form / finish | 304 | 430 | Procurement note |
|---|---|---|---|
| Cold-rolled coil & sheet | Common | Common | Major commercial product form for both grades. |
| Hot-rolled coil & sheet | Common | Common | Available for fabricated and industrial applications. |
| Precision strip | Available | Available | Confirm temper, edge condition and thickness tolerance. |
| Quarto plate | Common | Verify source | 304 generally has a much broader heavy-plate supply base. |
| Pipe & tube | Widely available | Application-specific | Confirm product standard and mill availability for 430 tubular products. |
| 2B / 2D | Common | Common | Common flat-product surface conditions. |
| Bright / decorative finishes | Common | Common | 430 is widely used where indoor decorative appearance is required. |
| Heavy welded fabrication | Suitable | Review grade | For ferritic welded fabrication, stabilized grades such as 439 or 430Ti may be more appropriate than standard 430. |
Check the conditions that matter for your component. The result is a preliminary screening recommendation before dimensions, fabrication, environment and the governing standard are reviewed.
Preliminary result
When service conditions are not clearly mild, 304 is normally the safer starting point because it offers broader corrosion resistance, higher ductility and better general-purpose welding capability.
Send Conditions to an EngineerIndoor, outdoor, moisture, chlorides, chemicals and cleaning agents.
Drawing, bending, welding, machining and decorative finishing.
Magnetism, thermal expansion, conductivity and appearance.
Grade, dimensions, finish, standard, certificate and inspection.
304 is the broader general-purpose grade. 430 becomes attractive when exposure is mild and the design benefits from ferritic thermal behavior, magnetism or nickel-free alloy economics.
The austenitic-versus-ferritic structure changes how the two grades behave during forming, welding and service.
| Requirement | 304 | 430 | Selection effect |
|---|---|---|---|
| Stretch forming | High ductility and strong stretch-forming performance. | Good general formability, but substantially lower elongation. | 304 is normally favored for severe multi-directional deformation. |
| Deep drawing | Very good general forming capability. | Ferritic grades can provide good drawability for many appliance and sink components. | For highly complex ferritic parts, stabilized 430Ti or 439 may be worth evaluating. |
| Welding | Excellent general weldability. | Unstabilized 430 is less suitable for welded structures. | Use 304 or investigate a stabilized ferritic grade when welding is a major fabrication requirement. |
| Machining | Work-hardening and toughness make machining more demanding. | Ferritic grades are generally easier to machine. | Tooling and process settings still need to be grade-specific. |
| Thermal cycling | Higher thermal expansion and lower thermal conductivity. | Lower thermal expansion and higher conductivity. | 430 can reduce thermal movement where its corrosion and fabrication limits are acceptable. |
| Chloride SCC | Austenitic stainless steels can be susceptible under the required combination of stress, chlorides and temperature. | Ferritic structure provides strong resistance to chloride-induced stress-corrosion cracking. | This does not make 430 the better choice for general chloride corrosion or pitting. |
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304 and 430 are not equivalents. They belong to different microstructural families and should only be substituted after corrosion, fabrication and functional requirements have been reviewed.
| System | 304 | 430 | Procurement note |
|---|---|---|---|
| ASTM / AISI type | 304 | 430 | Common North American grade names. |
| UNS | S30400 | S43000 | Preferred identifier when precise grade identity matters. |
| EN material number | 1.4301 | 1.4016 | Common European counterparts used in this comparison. |
| EN designation | X5CrNi18-10 | X6Cr17 | Shows the fundamental Cr-Ni versus ferritic Cr alloying difference. |
| Microstructure | Austenitic | Ferritic | A major reason these materials behave differently in service. |
| Related grade options | 304L / 1.4307 | 439 / 1.4510 or 430Ti / 1.4520 | Low-carbon 304L can improve welded corrosion performance; stabilized ferritics improve 430-family weldability. |
A designation from another standard should not be accepted as “equivalent” without checking chemistry, mechanical requirements, condition, product form, thickness, testing and certification.
Direct answers to the questions that usually determine whether 304 or 430 is the more appropriate stainless grade.
304 is an austenitic chromium-nickel stainless steel, while 430 is a nickel-free ferritic chromium stainless steel. 304 offers broader corrosion resistance, ductility and weldability; 430 offers magnetic behavior, lower thermal expansion and a lower-alloy cost structure.
304 normally provides better overall corrosion resistance. 430 is designed primarily for mildly corrosive environments, especially indoor applications such as appliances and kitchen equipment.
Yes. 430 is a ferritic stainless steel and is magnetizable. Annealed 304 normally has a low magnetic response, although cold working can make 304 noticeably magnetic.
430 normally has a lower alloy-cost position because it does not rely on the substantial nickel addition used in 304. The actual purchase-price difference still depends on product form, finish, dimensions, quantity, processing and market conditions.
430 can be welded in some applications, but standard unstabilized 430 is less suitable for extensive welded structures because the heat-affected region can lose intergranular corrosion resistance. For welded ferritic designs, stabilized grades such as 439 or 430Ti may be more suitable.
Ferritic stainless steels such as 430 are generally easier to machine than standard austenitic stainless steels. 304 is tougher and work-hardens during machining, requiring sharp tooling, rigid setup and appropriate feeds and speeds.
Both can be used. 430 is widely used for household appliances, kitchen equipment and sinks when the environment is mild. 304 is preferred when higher corrosion resistance, extensive welding or a broader service environment justifies the extra alloy cost.
Not in a simple overall sense. Cold-rolled 430 has a higher minimum 0.2% proof strength in the compared EN condition, but 304 has a higher tensile-strength range and far greater elongation. The correct comparison depends on the property that actually controls the design.
Only when the environment, fabrication process, magnetic requirement and appearance allow it. 430 should not be used as a universal low-cost substitute for 304 because corrosion resistance, weldability and mechanical behavior differ significantly.
Numeric values are separated by source and material condition. Typical mill chemistry is not presented as a purchase specification, and product availability or commercial pricing is not treated as fixed.
Comparison structured around purchasing decisions, grade standards and manufacturer technical data.
Review scope includes grade identity, chemistry, mechanical properties, thermal behavior, corrosion, formability, welding and machining.
Technical comparison prepared from published manufacturer and standard-reference information.
2026-09-23 — Initial T09 304 vs 430 page created with comparison tables, interactive selector, application matrix, FAQ, technical sources and procurement CTA routing.
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