Super stainless steel 304
Super stainless steel 304
(OP)
Hello everyone,
Anybody know about super stainless steel 304 that is used in super critical temperature boiler in power plant. I was informed that the as supplied material's hardness for this material is low but will increase during heating/operation due to the precipitation of Cu ...which will further increase its creep properties due to this mechanism...The hardness value will then stabilize..any link to this claim/material?
Any comment is highly appreciated...
Anybody know about super stainless steel 304 that is used in super critical temperature boiler in power plant. I was informed that the as supplied material's hardness for this material is low but will increase during heating/operation due to the precipitation of Cu ...which will further increase its creep properties due to this mechanism...The hardness value will then stabilize..any link to this claim/material?
Any comment is highly appreciated...





RE: Super stainless steel 304
RE: Super stainless steel 304
RE: Super stainless steel 304
The UNS is S30432
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P.E. Metallurgy, Plymouth Tube
RE: Super stainless steel 304
RE: Super stainless steel 304
USN S30432 is now part of II-D 2017, but only as SA-213 (tube), and only approved for section I constrction. Also see code case 2328-2.
RE: Super stainless steel 304
RE: Super stainless steel 304
However weld repair on material that has been in service could raise a whole other set of issues.
This is a proprietary grade so if you use it you will be single sourced.
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P.E. Metallurgy, Plymouth Tube
RE: Super stainless steel 304
RE: Super stainless steel 304
Maui
RE: Super stainless steel 304
RE: Super stainless steel 304
This alloy tries to preserve corrosion resistance by limiting the formation Cr carbides (sensitization) and by having finer grains they have a finer dispersion of secondary phase particles to assist in pinning. In systems like this the behavior is more like age strengthened Ni alloys than traditional stainless.
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P.E. Metallurgy, Plymouth Tube
RE: Super stainless steel 304
RE: Super stainless steel 304
RE: Super stainless steel 304
EdStainless ...I got it..I thought sigma phase that form from delta ferrite at high temperature that will reduce the toughness of the material.
weldstan,,we are using this material in our newly erected coal fired power plant...
RE: Super stainless steel 304
At the time I hadn't seen test results on repair of aged material, good to know that it works fine.
While not strictly proprietary I wasn't aware of anyone else making this grade. The Code will list single source alloys (even patented ones) if end users request it, they won't do it for producers.....
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P.E. Metallurgy, Plymouth Tube
RE: Super stainless steel 304
RE: Super stainless steel 304