Question

Chemical name of steel grade taster liqid

Answer 1

i think that it is stainless steel

Answer 2

ASTM A380 outlines a more refined test solution than the simple copper sulphate test. A 250 ml batch of test solution is made using distilled water and 
10ml sulphuric acid sp gr 1.84
4g copper sulphate

If a copper deposit forms slowly, but during a period of 6 minutes of swabbing the steel surface with the solution, then this can indicate that the steel is likely to be either a ferritic or martensitic stainless steel. If not then the sample is likely to be an austenitic type. (This may also be the case for most duplex steels as they have similar or better passivity than austenitic types).

An alternative is a copper chloride solution acidified with hydrochloric acid.
13ml concentrated hydrochloric acid
10g copper chloride 
50 ml distilled water

If the steel surface becomes copper plated when a drop is left on for one minute, then the sample is likely to be either a ferritic or martensitic stainless steel type. If not then the sample is likely to be an austenitic or duplex type.