Stainless Steel Grades Explained

What turns mild steel into stainless steel?

What do you add to stainless steel to make it martensitic or austenitic?

Which alloys are more weldable? Which are magnetic?

Which series resist better to corrosion and which ones to low temperatures?

Which machining or process can be carried out on a specific type? Or which type do you choose according to the end product?

Which steel is the more resistant, mechanically speaking? And what happens if I add copper to the casting?

CrMoV, 434, 201, 309, 904L, 15-5 PH... do you know them all?