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Join Date: Oct 2006
Location: IL
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Machining HK30 (ASTM A351 or A608)

10/20/2006 9:21 AM

Hi all,
We've gotten the bid to start mass producing parts (in the near future) made of HK30 (roughly 25% Cr, and 20% Ni). So far we've had the best luck using Walter inserts for facing, at .004/tooth, 350sfm, and we're getting five faces per corner. For drilling, we're using a Sumitomo replaceable-tipped drill. Does anyone have any experience machining this stuff?? Any ideas on how we can machine it in mass production and not lose our rears on tooling? Thanks in advance!

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#1

Re: Machining HK30 (ASTM A351 or A608)

10/20/2006 10:55 PM

Machining

Most machining operations can be performed satisfactorily on castings of HK alloy. It is

important in all cases that the tool be kept continually entering into the metal to avoid work-hardening the

surface. Slow feeds, deep cuts and powerful rigid machines are necessary for best results. Work should

be firmly mounted and supported, and tool mountings should provide maximum stiffness. Both high speed

steel and carbide tools may be used successfully.

Good lubrication and cooling are essential. The low thermal conductivity of the alloy makes it most

important to have the cutting fluid flood both the tool and the work. Sulfo-chlorinated petroleum oil

containing active sulfur and about 8 to 10 percent fatty oil is suggested for use with high speed steel tools.

Water-soluble cutting fluids are primarily coolants and are most useful for high speed operation with

carbide tools.

Information on the procedures for specific machining operations is contained in SFSA Steel Casings

Handbook, 6th Edition, Chapter 26.

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