It was the first time I purchased some deck screws, as stated on the box label. It also states the material is stainless steel. Made in Taiwan. It looked great as I got them at a reasonable price...

...but I found something odd when I arrived at my workshop: my strong magnet barely provoke reaction when close and even contacted with a such screws. They are practically amagnetic. It is strange as it would be mainly iron...

I would appreciate if you that are consumer for deck screws could explain me why Asian stainless steel is different from my other stainless steel experience.

Thanks in advance.