Sunday, October 2, 2011

Magnetic Stainless Steel

Stainless steel is often recognized for its corrosion resistance. But some grades also have varying magnetic abilities. Of the three stainless grades, austenitic steels have the least magnetic capability. Ferritic and martensitic steels, on other hand, have considerably stronger magnetic capabilities depending on how they are processed.

Austenitic

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Austenitic steels are typically made up of 17 to 25 percent chromium. While austenitic metals are known for their strength and weldabilty, magnetic permeability among this house of stainless steels is weak. There is no presence of magnetic permeability among metals in the austenitic house when in the annealed condition; a state achieved when stainless steel is heat treated. This is due to the high nickel article present in austenitic steels. When heavily cold-worked, austenitic types 302 and 304 are slightly ferromagnetic, the strongest level of magnetism can be achieved. Cold-working has no consequent on evoking magnetic abilities on austenitic metals such as 316 stainless due to its high nickel-to-chromium ratio.

Returning 302 and 304 stainless to a non-magnetic state can be ended through the heat rehabilitation application of stress relieving. The ability to perform magnetism can be eradicated fully with a full solution rehabilitation at 1000 to 1150 degrees Celsius.

Ferritic

Ferritic steels are magnetically soft, which means they can be in fact magnetized and demagnetized. Soft magnetic metals are used in the output of a wide array of products ranging from refrigerators to power electronic circuits. While other metals on the store are carefully more efficient for production soft magnetic components, ferritic steels are often used for applications which require corrosion resistance. Solenoid cores and pole pieces are among the products in which ferritic steels are used.

Compared to plated iron and silicon-iron, ferritic steel is carefully a more cost efficient material. Designed specifically for soft magnetic components, ferritic type 430Fr is known for its high electrical resistivity. This high electrical resistivity makes 430Fr an perfect performer in Alternating Current (Ac) based applications. The magnetic ability of ferritic steels decreases when cold-worked. Conversely, these stainless metals withhold a permanent level of weak magnetism if exposed to magnetic fields.

Martensitic

Like ferritic metals, martensitic steel is also ferromagnetic. In order to reach its full corrosive resistance potential, martensitic steel must be tempered, polished and hardened. If magnetized in the hardened condition, martensitic steel will exhibit permanent magnetic ability.

For more data on magnetic stainless steel, sense a stainless steel supplier.

Magnetic Stainless Steel

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