I heard they cooking up the scheme, got the stainless steel
But I don’t got a mark on me like I’m stainless steel

from The Pro Letarians – Church Lyrics on Rap Genius

Meaning

Cooking utensils are usually stainless steel, which means they cannot be stained. These other rappers are “cooking” up a plan to take him out (with their steel aka guns) but Jim can’t be touched

“Stainless steel” also describes these other rappers experience. They’ve never used the “steel” before, even if they talk about it in every one of their songs

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