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254 SMO/1.4530 Alternative Material

254 SMO/1.4530 Alternative Material

254 SMO/1.4530 Alternative Material

(OP)
Hello Colleagues,

We are a looking for an alternative material apart from Hastelloy C for 254 SMO. The part that needs to be manufactured is a 1.2 m long cylinder (ID 200 mm, OD 245). The raw material can be either casted or forged. Any recommendations?  

RE: 254 SMO/1.4530 Alternative Material

You can consider VDM Alloy 1925hMo (UNS N08926) , AL6XN (UNS N08367), or URB66 (UNS S31266), VDM Alloy 31 (UNS N08031).  All about the same chemistry and in about the saem price range.

RE: 254 SMO/1.4530 Alternative Material

and if the service temperature is between -40 and 600F you could use a 25 Cr duplex such as 2507 or 255 or Xeron 100.

You can also add N08925 to the above list.  Every major stainless producer makes at least one 6% Mo grade.

make the part by press forming a piece of plate into a cylinder, weld with matching filler, solution anneal (2175-2200F), water quench, and pickle.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: 254 SMO/1.4530 Alternative Material

(OP)
Thanks MikeMet and EdStainless. That's why i like this forum!

RE: 254 SMO/1.4530 Alternative Material

(OP)
strider6: copper sulphide slurry, up to 2300 psi, pH < 2, 160 to 170 °F.

RE: 254 SMO/1.4530 Alternative Material

254 SMO/1.4530 Alternative Material
Isn't there a mistake between 254 SMO and W=1.4530 ?
In my opinion, 254SMO is :
W=1.4547
UNS = S31254
ASME P Number = P 8.4
Conclusion : 1.4547 and 1.4530 are not in the same category

RE: 254 SMO/1.4530 Alternative Material

Quote:

ASME P Number = P 8.4

You mean ASME P-No 8, Group 4.

RE: 254 SMO/1.4530 Alternative Material

Why not line a less costly material with PTFE or ECTFE?

RE: 254 SMO/1.4530 Alternative Material

That is right 254SMO = P Nr 8 Group Nr 4 (ASME equivalent for plates : SA 240 UNS S31254)
Sincerely,

RE: 254 SMO/1.4530 Alternative Material

(OP)
Dear All,

My thread is a little bit old and we chose 1.4557 as an alternative in the meantime. No idea what UNS no. that is. But the chemical composition is basically identical to 254 SMO and we get this material approved by our client, too.

stainer: We use this cylinder as a cylinder liner. That means there is a piston moving inside. That's why we cannot coat it.

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