and some time non magnetic, whrere as metullargy ( % of Ni & Cr )are same for both.
Type 304 is your basic "18/8" austenitic stainless steel. In other words, Fe-18Cr-8Ni. It should never be magnetic. "Austenitic" steels are nonmagnetic.
If the steel is magnetic, it's safe to say it is NOT type 304. Probably one of the dirt-cheap "ferritic grades such as 409, 430, or 439. Very little can be said of these grades other than their low cost. Ferritic steels ARE magnetic, this is an easy way to tell the difference.
(Technical note: it's hard to even call 304 "steel" as it generally contains < 0.08% carbon. It's rightly an iron / chromium / nickel alloy, not steel. Steel contains from 0.2% - 2.1% carbon. )
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