Super Duplex 25 Chrome?

[CajunCAD]

I am being asked to design some mechanical components to be manufactured in Super Duplex 25 Chrome with a 125ksi minimum yield strength. Can someone point me in the right direction to find material specifications (UNS #, ASTM spec, etc...)?
Thanks in advance for your help.
Louis

 

[kramg]

There are a number of different types depending on the manufacturer. They are as follows

UNS S32760 Zeron 100
UNS S32750 SAF2507
UNS S39274 DP3W

 

[CajunCAD]

So far nothing meets the 125KSI minimum yield
I did run across some very good information here:

http://www.stainless-steel-world.net/pdf/11021.pdf

 

[kramg]

Thanks for the link. With respect to your application 125ksi/862MPa yield from a Super Duplex is not feasible!. I do not know what your application is but if you want this level of yield from a stainless steel type and resistance to intergranular and pitting corrosion you may consider looking at the martensitic precipitation hardening types ie FV520 UNS S45000 ASTM A564/A693/A705

Admittedly you will have to heat treat but typically in the aged condition 0.2$ proof strength is typically 1110MPa (161ksi) and 890MPa (129ksi) in the over aged.

 

[CajunCAD]

I narrowed the search down to 2 possibilities, SM2535 (UNS N08535) & SM2550 (UNS N06255). Here is a link to the Sumitomo information:

http://www.sumitomometals.co.jp/e/business/sm-series.pdf

Now I will work on determining what our customer is using on other components.
I suspect that the original description I was given may not be accurate.

 

[grampi1]

Sounds like an OCTG grade made from cold worked duplex.

 

[CalvinKelly]

A couple of other things to consider in alloy selection. The prime one is Availability--if you want a full mill heat you can get anything you want. But if your components total just a few thousand pounds of metal your choices are more restricted. Some alloys are only available as plate, others only as bar. Are you going to weld plate & sheet parts? Machine from bar? In what part of the world will you purchase and fabricate? High strength alloys, as have been mentioned, range from age hardening martensitics such as Carpenter 450 and 455, which are made as bar, through 17-4PH, available in both plate and bar, to higher priced nickel alloys such as alloy (Inconel) 718 (N07718), readily available from several sources as sheet, plate, bar & threaded fasteners. And what is the corrosive environment? The age hardening martensitics have approximately the corrosion resistance of 304 stainless, i.e. kitchen pots & pans. If this is a seawater application you will need something more highly alloyed.

James Kelly

http://www.rolledalloys.com