The magnetism of stainless steel pipe

Stainless steel seamless pipe magnetic stems from its organization structure, and chemical composition were not associated with (such as iron, nickel, etc.), is a physical property, and the anticorrosion properties of stainless steel is chemical properties, these two properties should be together.Therefore, the correct way to identify stainless steel should be by pharmaceutical test, or if there are conditions, it can be sent to an authoritative inspection agency for testing.

In addition, some fake stainless steel will use copper, nitrogen, manganese and other materials to imitate the appearance of stainless steel, its products are not magnetic, but this cannot be called stainless steel.

Normal we usually used in the 300 series and 200 series stainless steel for austenitic stainless steel, the standard of austenitic stainless steel in theory should be nonmagnetic, but the theory does not fully represent the facts, in stainless steel smelting component analysis or a little bit deviate from the heat treatment, can cause the austenitic stainless steel appear weak magnetism, austenitic stainless steel during cold working, the organizational structure to the martensitic transformation, the cold deformation, the greater the is, the more its transformation, magnetic is stronger.

Temperature also has a great relationship with magnetism. The magnetic properties of impurities in austenitic stainless steels of 304 and other materials can be eliminated, and the austenitic structure can be restored by high temperature solid solution treatment.