304 and 430 are both stainless steels, but nickel makes them behave differently. 304 is an austenitic chromium-nickel grade with better general corrosion resistance and more ductility for deep forming. 430 is a ferritic chromium grade with little or no nickel, which makes it magnetic and usually cheaper. Neither is a knife-blade steel. Choose a grade for each component, then confirm it on the material certificate.
Three steel families, not two grades
On a quotation, 304 and 430 often look like a premium and a budget version of the same metal. They are better understood as two different families of stainless steel, each suited to different parts of a product. A third family, the hardenable martensitic steels, belongs in the same conversation as soon as a product has a cutting edge.
All three rely on chromium, which forms a thin passive film on the surface that protects the steel and reforms when it is scratched. The differences come from what else is in the alloy. The World Stainless Association describes the austenitic family, typified by 304 at around 18 percent chromium and 8 percent nickel, as non-magnetic, and lists cooking utensils among the main uses of the 16 percent chromium ferritic type, which is 430. Martensitic steels have similar chromium but more carbon and specific heat treatment, and the association names knife steels as the best-known examples.
The British Stainless Steel Association's guide to stainless steel in the food and drink industry draws the same three-way split for food applications. It names types 304 and 316 as common in food processing equipment, describes 430 as offering good corrosion resistance at a lower cost than austenitic grades, and places martensitic steels in cutlery, knives and other items that need a sharp edge.
Swipe or scroll the table to compare all columns.
| Property | 304 (EN 1.4301) | 430 (EN 1.4016) | Martensitic blade steel (e.g. EN 1.4116) |
|---|---|---|---|
| Family | Austenitic | Ferritic | Martensitic |
| Typical chemistry | About 18% chromium and 8% nickel | About 16% chromium, little or no nickel | About 13 to 15% chromium with substantially more carbon, often 0.45% or above |
| Response to a magnet | Little or none when annealed; can rise after heavy forming | Attracted | Attracted |
| Can it be hardened by heat treatment? | No | No | Yes, which is what lets it take and hold a cutting edge |
| Behavior in wet kitchen use | Generally the more resistant choice where salt, acid and moisture linger | Suits drier, lower-exposure parts; more prone to staining or rust spotting in harsh, wet service | Depends heavily on grade, heat treatment, finish and care; needs drying after washing |
| Forming | Ductile; deep-drawing qualities are widely used for bowls and sinks | Good cold formability for many shapes; severe draws should be proven by trial | Usually blanked, hardened and ground as blades rather than deep drawn |
| Typical kitchenware roles | Bowls, shaker bodies, utensil heads, food-contact surfaces | Handles, frames, trays that stay dry, induction base discs, trim | Knife blades and other cutting edges |
On a drawing, use the European number alongside the AISI name, for example 304 (1.4301) or 430 (1.4016). You will also meet the cutlery shorthand 18/8, 18/10 and 18/0. The British Stainless Steel Association notes that 18/10 is essentially the 304 (1.4301) grade and that 18/0 corresponds to 430. Our guide to 18/8 vs 18/10 stainless steel explains why the shorthand is a poor basis for a purchase order.
What nickel changes in daily use
Will 430 stainless steel rust in a dishwasher?
It can show staining or rust spotting sooner than 304 when it stays wet with salt, acidic food residue or detergent, especially at cut edges, scratches and crevices. Aperam, a stainless steel producer, describes its 430 (1.4016) as having good corrosion resistance "in moderately aggressive environments". A dishwasher cycle followed by hours of standing water is not a moderate environment. How quickly a problem appears depends on the finish, the detergent, the drying and the design, so treat it as a risk to design out rather than a predictable timetable.
If a product will be sold as dishwasher safe, or will hold acidic food, salt or brine, that is a strong argument for 304 or better on the contact surface. If a part stays dry and is wiped rather than soaked, 430 is often a sound choice.
Is 430 harder to form than 304?
For deep shapes, usually yes. Aperam describes its 304D (1.4301) as "ideal for deep drawing" and lists sink units and domestic cooking equipment among its uses, while it credits 430 with good cold formability. That is why deep-drawn bowls, shakers and pans are conventionally specified in 304. Ferritic steels are pressed and drawn every day, so this is not a blanket rule. Whether a particular shape works in 430 depends on the draw depth, corner radii, tooling and the exact steel quality, and it should be proven on samples.
Is 430 stainless steel safe for food contact?
The grade number alone does not answer that. The US Food and Drug Administration explains that "The overall regulatory status of a food contact material is dictated by the regulatory status of each individual substance" in it, and other markets set their own rules and tests. Many 430 parts are used around food, and the right question is whether the evidence for your material, finish and intended use satisfies your destination market. Our food contact document guide covers that evidence pack.
Specify the grade by component
Most kitchenware is an assembly, and the grade should follow the job each part does. A serving tray can use 304 for the surface that touches food and 430 for an underframe that never gets wet. Specifying at component level keeps the cost sensible without putting a corrosion risk where water and food sit.
Swipe or scroll the table to compare all columns.
| Component | Usual starting grade | Why | Check on the sample |
|---|---|---|---|
| Bowl, shaker body or other deep-drawn vessel | 304 | Wet and often acidic contact; ductility for the draw | Corners of the draw, seams, finish after a wash trial |
| Utensil head: spatula, ladle, skimmer | 304 | Repeated food and dishwasher contact | Edges, spot welds, staining after washing |
| Handle, frame or part that stays dry | 430 or 304 | 430 can save cost where exposure is low | Joints with 304 parts, crevices that trap water |
| Induction base disc | A ferritic grade such as 430 | Induction needs a magnetic layer in the base | Bonding, flatness, function on an induction cooktop |
| Knife blade | A martensitic grade such as 1.4116 or a 440-type steel | The blade must be hardened to hold an edge | Hardness evidence, edge quality, spotting after washing |
| Bolster, rivets, blade guard fittings | Often austenitic, or as specified with the blade | Non-cutting parts that sit at joints | Gaps and staining around rivets and the heel |
Which grade works on an induction cooktop?
Induction needs a ferromagnetic base, which is the property 430 has and annealed 304 lacks. That is why induction-ready cookware often bonds a ferritic disc into a 304 body: the 304 gives the food-contact surface, and the ferritic layer makes the pan work on the cooktop. If a product must be induction compatible, state it as a functional requirement, because it changes the base construction rather than merely the material.
Which components need a cutting edge?
Knife blades need a different family altogether. BSSA explains that austenitic and ferritic grades cannot be hardened by heat treatment, while the added carbon in martensitic steels lets them respond to hardening, which is what makes them suitable for knife blades. Neither 304 nor 430 will hold a working edge on a chef knife.
Blade steels also differ among themselves. Aperam describes 1.4116 as a 14 percent chromium martensitic steel with 0.45 percent carbon, plus small additions of molybdenum and vanadium, for knife blades and food-preparation utensils. Alleima lists its 12C27 knife steel at a nominal 0.60 percent carbon and 13.5 percent chromium. Higher carbon generally allows higher hardness, which helps edge retention but changes toughness, corrosion behavior and ease of sharpening. The hardness a blade actually reaches is set by its heat treatment, so a knife brief needs a named steel and a target hardness range with the test method. A blade described only as stainless steel tells you very little. Our chef knife programs page lists the blade decisions to make first.
The magnet test, and its limits
Does a magnet test tell me if it is 304?
It can tell you which family a part probably belongs to. It cannot confirm a grade. BSSA's note on the magnetic properties of stainless steel explains that austenitic grades have a relative permeability close to 1 and can be classed as non-magnetic, while ferritic and martensitic steels are attracted to a magnet. A firm pull points to a ferritic or martensitic steel; little or no pull is consistent with an annealed austenitic grade such as 304.
- Forming changes the result. BSSA notes that the degree of cold work affects the magnetic permeability of austenitic grades, so a drawn corner or a heavily worked rim can show some attraction even when the sheet is 304.
- It cannot separate 304 from 316 or other austenitic grades, or 430 from a martensitic blade steel.
- It reads only the part it touches. On an assembly it says nothing about a component hidden underneath.
How do I verify the grade my supplier actually used?
Use evidence that measures or documents the chemistry, in a sequence that matches the risk of the product.
- Name the grade of each component on the drawing, using both the EN number and the AISI name.
- Ask for the mill's inspection certificate for the coil, sheet or bar used, showing the heat number and chemical analysis.
- Agree how that heat number will be traced to your production lot, because a certificate for the mill batch in general proves little about your parts.
- Screen incoming samples with a magnet to catch an obvious family mix-up early.
- Where the risk justifies it, have finished parts analyzed. Handheld XRF analyzers read chromium, nickel and molybdenum well but do not measure carbon, so blade steels need optical emission spectrometry or a laboratory analysis.
- For knives, add a hardness test on sample blades from the lot, by an agreed method and against an agreed range.
Writing the grade into your specification
A specification that only says stainless steel leaves the choice with whoever buys the material. Name the grade per component, in a form that survives translation into a purchase order and can be checked against a certificate.
- State the grade for each part, for example: bowl 304 (1.4301), handle 430 (1.4016), blade 1.4116.
- State the thickness. A thin 304 part can feel flimsier than a thicker 430 one, and buyers often blame the grade for a gauge problem.
- State the finish separately, such as a mill finish, brushed or mirror polished. A brushed and a mirror finish age very differently in the same grade.
- For blades, state the steel, the target hardness range and the test method.
- Say whether you require a certificate, and whether it must trace to your production lot.
- State induction compatibility as a functional requirement where it applies.
- For food-contact parts, reference the destination market requirement rather than the grade alone.
Put these details on the drawing rather than only in an email, because the drawing travels with the job and is what an inspector reads. Our kitchenware spec sheet guide shows where material, thickness and finish sit in a full specification.
Cost, availability and lead time
Why is 304 usually more expensive than 430?
Mainly nickel. It is a costly alloying element whose price moves with the metals market, so a 304 quotation carries more raw-material price risk than a 430 one. When a quotation has a short validity window tied to material cost, nickel exposure is usually the reason. 430 avoids most of that exposure, which is part of its appeal for high-volume parts that stay dry.
Where conditions are harsher, 316 is the usual next step. Aperam's 316L (1.4404) carries about 2 percent molybdenum, which improves resistance to chlorides, meaning salt. For many domestic products the extra cost is hard to justify. For brine, coastal markets or very frequent commercial washing, it is worth pricing.
Availability rarely blocks a project in either grade, though unusual thicknesses can. Standard sheet sizes are generally available from stock; an off-standard thickness may need a mill order with its own minimum, which can push both the lead time and the order quantity upward. Ask early whether your thickness is a stock size, because as the MOQ guide explains, the material purchase is often the hard floor under a minimum.
Your checklist
- Grade named for each component with EN and AISI numbers, not 18/10 shorthand
- Thickness and finish stated alongside the grade
- Deep-drawn parts specified in 304, or a ferritic draw proven on samples
- Induction compatibility stated as a functional requirement where it applies
- Knife blades specified in a named martensitic steel with a target hardness range and test method
- Inspection certificate requested, with the heat number traced to the production lot
- Carbon-sensitive blade steels verified by OES or a laboratory, not XRF alone
- Food-contact evidence requested for the destination market, not inferred from the grade
- Quotation validity understood where nickel exposure applies
- Specified thickness checked against standard stock sizes