Short answer: Solution-annealed 304 is normally non-magnetic or only weakly magnetic. Cold rolling, bending, deep drawing and welding can create phases that produce a measurable magnetic response, so a magnet alone cannot authenticate or reject 304.
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 |
|---|---|---|
| Annealed 304 sheet | Usually very low attraction | Austenitic structure dominates |
| Cold-worked 304 strip | Mild to noticeable attraction | Strain-induced martensite can form |
| Weld zone | May attract a magnet locally | Ferrite can be present in the weld |
| 430 stainless steel | Strong attraction | Ferritic structure is magnetic |
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
- Specify a maximum magnetic permeability when the application is magnetically sensitive.
- Use chemical analysis or PMI for grade verification rather than a handheld magnet.
- Tell the supplier the temper and forming reduction because magnetism changes with processing.
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
- Rejecting genuine 304 because a magnet sticks weakly
- Assuming non-magnetic material must be 304
- Ignoring the effect of cold work in clips, sinks and stamped parts
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
If magnetic behavior matters, add permeability or magnetic-attraction acceptance criteria, product condition, sampling plan and test method to the purchase specification.
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
Should a magnet stick to 304?
It normally should not stick strongly to annealed 304, but cold-worked areas can show attraction.
Is 316 completely non-magnetic?
Annealed 316 is also nominally non-magnetic, but welding or cold work can create a small response.
What test confirms 304?
A calibrated XRF or OES chemical analysis, supported by traceability and the mill certificate, is more reliable than a magnet test.
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.