Vessel ASME VIII 304H material
Vessel ASME VIII 304H material
(OP)
I have to design a 10” diameter ASME VIII div.1 vessel containing hydrogen, with design temp. of 500°C and design press. of 20 barg. I should use 304H stainless steel but it’s hard to find this material on the market. A supplier propose 304/304L as an alternative material. Can be this solution correct? Which material can I use for this application? Is the 321 stainless steel suitable for this application?





RE: Vessel ASME VIII 304H material
One of the pressure vessel guys will be along to provide more info.
Nick
I love materials science!
RE: Vessel ASME VIII 304H material
You'd reach a better audience in forum794: Boiler and Pressure Vessel engineering.
At your temperatures, there is no difference in the basic allowable stress in tension for Div. 1 whether you are using SA240 304 or 304H (or SA213 304 or 304H). So unless there is a material engineering issue with hydrogen diffusion into the steel with the differrent grades, there should be no difference. Be sure you read and understand the notes in II-D for these materials and choose your allowable stress accordingly.
jt
RE: Vessel ASME VIII 304H material
The 304H grade material is necesary for the 500 deg C service temperature. The 304L low carbon material would be limited to less than 425 deg C service, due to de-rated strength.
The straight 304 grade material with a minimum 0.04% carbon would handle the 500 deg C service, as well as would the 304H grade material.
RE: Vessel ASME VIII 304H material
RE: Vessel ASME VIII 304H material
RE: Vessel ASME VIII 304H material
RE: Vessel ASME VIII 304H material
luis
RE: Vessel ASME VIII 304H material
i understand that i've to ask to my suppliers 304 with minimum of 0.04% of carbon. someone told me that now fitting are supplied with a 304/304L certificate.
thank you very much!
RE: Vessel ASME VIII 304H material
There is increasing proportion of dual certified 304/304L material supplied on the markets. Strength of the dual certified material is increased by additions of nitrogen and other elements to meet the ambient temperature strength test requirements for straight 304 SS.
The 500 deg C application requires the strength imparted to the material by the minimum 0.04% carbon content, unlees there is evidence that the particular dual certified 304/304L material would have adequate strength at 500 deg C.
Better to find another supplier for SS fittings. Your application is not the common food service or pharma grade piping design. What fittings do you need with the 10 inch vessel?
RE: Vessel ASME VIII 304H material
http://www.gpss.com/products.php
http://www.rolledalloys.com/trc/hrheatalloys.aspx
RE: Vessel ASME VIII 304H material
Though it may be good practice to require 0.04% C at 500°C (932°F), this is not a Code requirement until the temperature reaches 1000°F per note G12 in II-D. No changes here for the 2007 Edition.
jt