Short answer: Choose 430 when strong magnetism, lower alloy cost and mild indoor corrosion service fit the product. Choose 304 when better general corrosion resistance, weldability and demanding forming are more important.
This guide is written for stainless steel buyers, sourcing teams, engineers and product manufacturers. The purpose is not to declare one universal winner, but to turn a broad material question into a specification that a mill or service center can quote, process and inspect consistently.
Quick Comparison
| Option | Key point | Typical use or decision |
|---|---|---|
| 430 / S43000 / EN 1.4016 | Ferritic, magnetic, nickel-free | Appliance panels, induction-compatible parts, dry interior trim |
| 304 / S30400 / EN 1.4301 | Austenitic, usually weakly magnetic | Sinks, food equipment, tanks and welded fabrication |
The table is a starting point. Actual performance depends on the governing standard, delivered condition, dimensions, surface finish, fabrication route and service environment. Commercial names should never replace a complete purchase specification.
What Buyers Should Evaluate
- Confirm whether magnetism is a functional requirement.
- Review draw depth and welding before replacing 304 with 430.
- Use a suitable finish and regular cleaning where 430 is exposed to moisture.
For production orders, share the end use rather than requesting a grade or finish in isolation. A supplier can then review corrosion exposure, forming severity, welding, visual requirements and packing before material is cut. This early review is usually less expensive than correcting a rejected shipment or unstable production trial.
Common Purchasing Mistakes
- Calling 430 inferior solely because it is magnetic
- Using 430 in chloride-bearing wet service without testing
- Expecting 430 to form and weld exactly like 304
These mistakes are avoidable when drawings, approved samples, inspection methods and certificate requirements are agreed before production. For visual products, retain a signed master sample. For functional dimensions, define where and how measurements will be taken.
Recommended RFQ Wording
Include magnetic requirement, exposure, forming depth, weld process, finish, dimensions and acceptance sample. Grade substitution should require written approval.
Also include order quantity, acceptable quantity variation, destination, required delivery date and whether partial shipments are allowed. If a requirement is critical, make it measurable and place it on the purchase order rather than only in an email conversation.
How Still Steel Supports the Project
Still Steel supplies stainless steel coil, strip and sheet and provides slitting, cut-to-length, brushing, polishing and protective-film services. We can compare available mill material with your drawing, prepare trial quantities and preserve heat-number traceability through service-center processing.
Send the grade, dimensions, annual volume and application to vip@still-steel.com, or discuss the requirement on WhatsApp.
Frequently Asked Questions
Is 430 stainless steel magnetic?
Yes. Its ferritic crystal structure produces strong magnetic attraction.
Does 430 rust more easily than 304?
430 generally has a lower corrosion margin, especially in chloride or persistently wet conditions.
Can 430 be used for cookware?
Yes for selected components, especially where induction magnetism matters, but the complete construction and food-contact requirements must be reviewed.
Technical References
Reference documents support general selection and fabrication principles. The final material decision must follow the applicable contract, standard, regulation and engineering review for the specific product.