Compare 304SS and duplex SS
Compare 304SS and duplex SS
(OP)
Can anybody guide me for comparing pro/cons/cost for 304SS and duplex.I am into cooking appliance industry looking for cost reduction in 304SS parts.i also need if cladding can be useful for cost reduction in high volume SS parts.





RE: Compare 304SS and duplex SS
Duplex such as SAF 2205 provides an alloy designed to prevent stress corrosion cracking. It may cost a 10% premium over 304ss.
You would expect that in your industry there will be temepratures above 50C and chlorides will possibly be used in the cleaning of such parts. This is a perfect environment for stress corrosion cracking.
RE: Compare 304SS and duplex SS
RE: Compare 304SS and duplex SS
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RE: Compare 304SS and duplex SS
First you need to be aware that there are about a dozen different duplex grades available and they cover a wide range of corrosion resistance.
If 304 is failing then moving to a duplex may be the lowest cost way of getting a better part.
If you want to reduce total cost then you will need to use the higher strength in order to make the parts thinner/lighter. On a $/lb basis the lean duplex alloys are more expensive than 304 by 5-10%. But if you can cut thickness by 20% you can save money.
The prices of the duplex alloys will also be more stable since they contain so little Ni and Mo the surcharges don't fluctuate much.
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Plymouth Tube
RE: Compare 304SS and duplex SS
Yes I do agree that Ni prices have fluctuated so much to destabilze SS part cost.That is why I am opting for alternative to 304SS.I am looking for better dent resistance,formability, with the corrosion resistance to be like 304SS.
I think the thickness avalibility (may be .020 to .026 range)may drive the cost.
Can you suggest me some steel makers for starting point.
I know winox and otokumpu offer speciality duplex grades.
Edstainless,I really admire your knowledge in this field.Thanx again.
RE: Compare 304SS and duplex SS
Allegheny AL2102
These are the two that I like the best.
Don't bother with 19D, it has poor corrosion resistance
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Plymouth Tube
RE: Compare 304SS and duplex SS