In daily life, many people believe that stainless steel screws are not magnetic, and often with the help of magnets to identify whether the screw material is stainless steel, this method of judgment is actually unscientific. Today, Aozhan Hardware Fastener Co., Ltd. will take you to learn the stainless steel screw magnetic cold knowledge.
Stainless steel can be divided into two categories according to the tissue structure at room temperature: austenitic type and martensitic or ferritic type. Austenitic type is non-magnetic or weakly magnetic, and martensitic or ferritic type is magnetic. At the same time, all austenitic stainless steel, only in the vacuum state is possible to completely non-magnetic, so we can not rely on a magnet alone to determine the authenticity of stainless steel screws.
Austenitic stainless steel screws present face-centered cubic crystal structure, the surface of the organization is paramagnetic, so the austenitic organization itself does not show magnetic. After cold deformation is to induce a part of the austenite into martensite and ferrite organization of the external conditions.
Generally the deformation of martensite increases with the increase of cold deformation and the decrease of deformation temperature. That is, the greater the cold working deformation, the more martensite transformation, the stronger the magnetic properties will be. In contrast, hot-drawn austenitic stainless steel is almost non-magnetic. If special requirements, need to choose completely non-magnetic stainless steel bolts, we need to finish parts demagnetization process .
The above is a brief introduction to the magnetic knowledge of stainless steel screws, I hope it can help you.
Nanning Aozhan Hardware Fastener Co., Ltd. is mainly engaged in stainless steel bolts, screws, washers, nuts, pins and other products. It has 10 years of experience in the bolt industry. It has a complete range of stainless steel, sufficient inventory and stable supply capacity. Please choose stainless steel bolt products. us. We will serve you wholeheartedly and look forward to cooperating with you. Please send email to info@aozhanfasteners.com for consultation.
Post time: Oct-24-2022
