Dina Entity 6-Piece Knife Block

I bought these a few weeks ago and was excited to get a stainless set with a wooden block that didn't have too many unnecessary knives. I only wanted a bread knife and utility knife but decided that a few extra could be okay depending on the price. The price of this set was reasonable but there was nothing in the description to indicate the stainless steel grade. I was surprised to see X30Cr13 written on the blades. They're nice and sharp but the ones I used rusted after a couple uses. I'm quite disappointed by that and the fact that the ABS was peeling right out of the box. I expected better from this brand.