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CajunCAD (Industrial)
18 Dec 03 18:02
Can someone help me understand the different grades and make sure I am using the correct names/UNS numbers?

I think I have this one correct:
13-Chrome Modified (ex: UNS S41000, S42000)

I think this is correct as well:
Super 13-Chrome (ex: UNS S41425)

I don't know if these are named correct and don't know a UNS #:
13-Chrome Hyper 1 or Super 13-Chrome Hyper 1
13-Chrome Hyper 2 or Super 13-Chrome Hyper 2

Any information/website addresses would be greatly appreciated.
Helpful Member!  kenvlach (Materials)
18 Dec 03 20:28
These names are non-standard -- part description and part advertising spiel.  Don’t specify their use, you will be at the mercy of a single supplier.  Use composition (UNS no. if available) and properties.

UNS 41000 is simply AISI 410, a martensitic stainless of 0.15% C and 11.5-13.0% Cr, without any nickel content.
UNS S42000 is AISI 420, with min 0.15%C and 12.0-14.0% Cr.

UNS S41425 is a non-AISI grade, of 4.5% Ni, 13% Cr, 1.5-2.0% Mo, 0.005% max S, 0.025% max P, 0.02% C, 0.5% max Si, 0.5-1.0 Mn, 0.08% N, 0.06% Cu.  It appears to be a “supermartensitic” stainless steel.  

Supermartensitic Stainless Steels
“The new type of weldable martensitic stainless steel grades combine high strength, good corrosion resistance in sweet or mildly sour environments, and acceptable fracture toughness down to - 40 C.”  For further info on supermartensitic stainless steel, compositions and suppliers, see http://www.stainless-steel-world.net/supermarten/grades...
BobUXL (Materials)
22 Dec 03 9:41
Besides the martensitic grades, there are ferritic grades that are 13% chrome as well.  These ferritic grades grades are specifically designed for enhanced magnetic properties.  I do not believe there is a UNS number for these grades.

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