A 276 at 1200 F

[vtpipeme]

Does anyone have any experience using A 276, 316 SS as a vessel component. We are fabricating a piece of our vessel from bar stock, but the ASME II tables have no information (that I've found) for A 276. We're using it at 1200 F and 4500 psi.

Any experience? References?

Thanks.

 

[metengr]

NO. I would NOT recommend SA-276 material for this application. If you want to use 316 SS, I would go with SA-336 Grade F316 SS or even upgrade to SA-336 Grade F321H material. The SA-276 material is for general use and is not approved by ASME Section II in pressure retaining components.

 

[jte]

vtpipeme-

If your "piece" of the vessel is a pressure retaining component, then as metengr stated, you may not use the SA276 material. On the other hand, if the piece is a clip or ring or support etc then you may use it. But... you'll have to decide for yourself what the allowable stress will be.

jt

 

[vtpipeme]

The piece is indeed a pressure retaining component, plugs. I take it by this that A 276 can only be used in a structural application. Does anyone know the reason? What is A 276's mode of failure? I want to make sure I don't misuse it.

 

[metengr]

The reason that SA-276 material is not endorsed for use as pressure retaining has more to do with how the material is supplied under this specification, and the variation in properties (mechanical and corrosion). The ASME code committees review extensive data prior to approving a material for use in service to assure a consistent properties that will provide safe and reliable service in design.

The difference between SA-276 and SA-336 has more to do with differences in melting practice and heat treatment specifications. I would recommend that you review and compare these specifications.

From your last post, it sounds like you had purchased this material and have already made plugs. If this is the case, replace this material with SA-336.