Spark method can be used to distinguish the types of stainless steel, but it is almost impossible to distinguish specific brands.

There are three kinds of stainless steel:

Austenitic stainless steel (that is, kitchen utensils in our daily life and sanitary stainless steel used in hospitals)

Ferritic stainless steel (decorative strip on automobile, some stainless steel with low requirements for stainless steel furniture)

Martensite stainless steel (high hardness special stainless steel, stainless steel barrel, stainless steel bearing, stainless steel knife)

Among them, austenitic stainless steel is non-magnetic, so magnets can't attract it.

Ferrite and martensite are magnetic.

Generally, it is like this: first find austenitic stainless steel with a magnet, and then the remaining two are ferrite and martensite.

Then use spark recognition:

Ferritic stainless steel has less sparks and is relatively black.

Martensite special stainless steel with high hardness, bright spark and obvious splash, similar to high carbon steel.

Then there is a distinction.

Finally, by the way, there is almost no spark when austenitic stainless steel without magnetism is put into the cutting machine. So you can see it. Of course, it would be more convenient if there were magnets.