Magnetism of Stainless Steel 304 Due to Cold Rolling

Abstract

304 austenitic stainless steel (SS 304) is widely used in the oil and gas industry to resist high pitting and stress corrosion. However, It's wear resistance to withstand the fine sand particles carried out from the oil well is very limited. Cold rolling is one of the mechanical methods used to increase the hardness of SS 304 steel. This method causes a crystalline structure deformation of ss 304 and transforms their phase from austenite to martensite. The phase transformation is followed by the change of magnetic properties of these materials. The increasing percentage of structure deformation is followed by an increase of magnetic saturation value and a change of magnetic coercivity. A large population of martensite phase formed influenced the magnetic saturation value. While deforming of grain shape influenced the magnetic coercivity. The rise of its magnetic property will respond to an external magnetic field. Therefore, the observation of structural deformation of SS 304 can be identified by magnetic interaction.