One of our customer come from Brazil, he looking for stainless steel screws with EPDM washer, we according customer request had arranged some similar size stainless steel 410 self drilling screw samples to the customer. But when customer received the samples he asked us why is there magnetism? Do we provide samples of steel material?
Everyone knows that stainless steel screws are non-magnetic, people often use magnets to adsorb stainless steel materials to verify whether it is stainless steel, in fact, this is an extremely one-sided and unrealistic wrong identification method.
The micro structure of stainless steel is important because this is the magnetic property of stainless steel.
Which can be divided into several categories according to the organizational structure at room temperature:
- Austenite type: such as 304, 321, 316, 310, etc.;
- Martensite or Ferrite type: such as 430, 420, 410, etc.;
The Austenite type is non-magnetic or weakly magnetic, and the Martensite or Ferrite is magnetic.
Stainless steel 410 belongs to the 400 series stainless steel, which is a ferritic and martensitic stainless steel with ferromagnetic properties and can be attracted by magnets. But whether it can be sucked up by a screwdriver depends on the magnetism of the screwdriver and the self-weight of the stainless steel parts.
Stainless steel 410 is a stainless steel grade produced in accordance with the American ASTM standard, which is equivalent to my country's 1Cr13 stainless steel material. 410 stainless steel has good corrosion resistance, machinability and high strength.