Best Alloy for SS mixer blades?

[ccaissie]

Hi:
Looking for the best combo of hardness and corrosion resistance in stainless steel.
We like 17-4PH for hardness and fab reasons,
We like AL6XN for corrosion, but it's too soft.

We'd also like to avoid elaborate heat treat or welding procedures.

Colin Caissie
UET Mixers

 

[CoryPad]

Corrosion resistance for what environment?

 

[EdStainless]

Have you had wear failures in AL-6XN, or are you guessing? This alloy is much more wear resistant than it hardness would lead you to believe.

There is a tremendous difference in corrosion resistance between those alloys. If you need something close to AL-6XN then you should look into a super-duplex alloy (2507, Zeron 100, Feralium 255). These will be stronger than AL-6XN and have similar corrosion resistance.

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Plymouth Tube

 

[MJCronin]

The only two corrosion resistant materials offered by the majors (as best as I can recall) are 316 and the high priced C276.

(C276 is also known as Hastelloy C)

 

[MikeMet]

For more corrosion resistance you could use 13-8Mo PH stainless steel. Super duplex is more wear resistant than AL6XN with about the same corrosion resistance and can be easily fabricated.

 

[rolledalloy]

With respect to superduplex the following information on ZERON 100 in erosion corrosion may be helpful. Typically the superduplex grades around 22 Rockwell C so they do offer higher hardness levels than austenitic counterparts such as AL-6XN (88 Rockwell B) which offer similar corrosion resistance.