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topic 8834

Soft stainless steel


(2001)

Is there a process that can harden a 430 stainless steel screw? This screw is cold worked and the phillips head drive is too soft to removed a tightened screw. Therefor causing damage to the soft Phillips drive.

Ken Rothrauff
Nordson Corp. - Atlanta,GA,U.S.A.


(2001)

Hello Ken!

Well, 430 is a ferritic grade of stainless steel, and is not hardenable by heat treatment. Nor will it work harden readily. If you need a hardenable stainless steel, I would suggest a 440 grade, or maybe one of the PH grades like 17-4.

The nickel development institute offers a superb 'book' called Design Guidelines for Stainless Steel which describes the various grades is good detail, for free. Go to www.nickelinstitute.org and seek out publication # 9014. Then fill out the form and they'll send it to you.

Hope this helps!

lee gearhart
Lee Gearhart
metallurgist



(2001)

It might not be the screws hardness that is the problem. The problem might be corrosion if the screw is going into a dissimilar metal such as aluminium

Martin Trigg-Hogarth
Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England



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