304 CRES Stainless Steel

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Thread: 304 CRES Stainless Steel

  1. #1
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    Default 304 CRES Stainless Steel

    What does CRES stand for and is there Different Grades for this material? How well does it machine?

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    CRES stands for Corrosion Resistant. What you have is regular old 304.



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    Thank you for that info. This is very helpful.



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    It machines ok, but much slower than 1018. Drilling with split point cobalt at 30 sfm is what I would recommend. Milling with cobalt roughers flooded (65 sfm) and TiALN coated carbide finishers dry (250sfm). Rubbing work hardens the piece. Never dwell and you should be good.



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    If you can, use 304L; it has higher machinability. If no further specs are called out (ASTM, etc.) any commercial grade can be used. 304 is Austenitic (non-magnetic). End milling & turning speeds are 60-110 SFPM HSS, 220-360 SFPM carbide (from the Machining Data Handbook). It work-hardens easily so don't dwell or make skin passes. It welds easily also.



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    Great info, thanks all.

    How does 303 compare to 304 for lathe machining, assuming that both are readily available?



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    303 is 2 to 5 times EASIER to machine. Given a choice I think any experienced machinist would go with 303.



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    Registered ImanCarrot's Avatar
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    An old saying: "303 she's for me, 304 she's a whore"

    I love deadlines- I like the whooshing sound they make as they fly by.


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    I have a material call out that only says "CRES per Matl Spec 6863". Anyone know what that spec is? Would that make the CRES 301, 303, 304?
    Thanks, Tim



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    But 304 looks so lovely when done right



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304 CRES Stainless Steel

304 CRES Stainless Steel