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300 grades of stainless (austenitic) steel are considered to be "faintly" magnetic, that is they will be attracted to a magnet very little. 400 grade stainless steel (Martensitic) is definitely magnetic and will be attracted by a magnet.
The difference is in the Nickel content in 300 grade versus little or none in 400 400 is also heat treatable which is why is used in firearms.
304 grade, the old reliable 18 & 8 (approximately 18% chromium & 8% Nickel, balance carbon steel.) with varying amounts of carbon mainly for post weld corrosion prevention.
Roger
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Trigger control + Breath control + Sight alignment = Gun Control.
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NRA Smallbore Prone Master, High Power Master
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