| Search our quarter-million Q&As |
Home of the finishing HOTLINE since 1989
-----Magnetic coating for stainless steel
We are designing a product which contains a sensitive spring that is immersed in drinking water (temperature between +10 °C to +75 C). The spring has to withstand these conditions for at least 10 years. Due to the requirements of the product we need to have this spring also magnetic. We first considered standard ASTM A228 spring steel as a material but this isn't magnetic enough. I was thinking that shouldn't standard nickel coating on stainless steel (like A228) increase the magnetism? Is it possible to coat A228?
Sami LakkaProduct designer - Tampere, Finland
January 31, 2011
Would an impervious plastic coating over a conventional steel spring not be an option?
G. Marrufo-Mexico
Monterrey, NL, Mexico
February 4, 2011
ASTM A228 is a specification for music wire (patented, cold drawn unalloyed steel with a pearlitic microstructure, equivalent to grade DM or DH according to EN 10270-1). It is definitely ferromagnetic. Certain cold drawn stainless steel spring wire will be magnetic, due to the strain induced phase change (from austenite to martensite). Type 302 according to ASTM A313 or X10CrNi18-8 (1.4310) EN 10270-3 are the relevant standards.
Toby PadfieldAutomotive supplier - Michigan, USA
February 7, 2011
Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.