Is 304 Stainless Steel Magnetizable?

Gateway Arch (304 Stainless Steel) - Wikimedia Commons GNU Free Documentation License Version 1.2 by Rdikeman
Gateway Arch (304 Stainless Steel) – GNU Free Documentation License Version 1.2 by Rdikeman
Can 304 stainless steel be magnetized? The answer rates more than a simple yes or no.

Iron is alloyed with different amounts of chromium to produce 3 classes of stainless steel. These are martensitic, ferritic, and austenitic steels. These three are classed separately because each has a different microstructure.

304 Stainless Steel

Type 304 stainless is austenitic. It is non-magnetic. Special treatments change that. The treatments may be to produce fasteners or other items that require it.

Magnetic & Non-Magnetic

Both ferritic and martensitic stainless steels are easy to magnetize. Austenitic steels such as cold worked 304 undergo partial conversion of their austenite microstructure to martensite.

Because stainless type 304 is cheap yet has many fine properties, it is chosen for objects requiring cold working. They may be magnetized. Yet some are non-magnetic.

Videos on Steel Manufacturing

This U.S. Steel video gives a brief steel making demo – start to finish – from blasting for ore to finished product.



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References: ← Back to Classic-Science
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