A-212-A?

[meca]

I am working on Gasoline Storage Sphere built sometime in the 60's and they have indicated the material is A-212-A. I have found lots of information on A-212-B, but I can't find any properties for A-212-A. Can anyone tell me the difference between Grade A and B?

Are spheres usually designed to ASME Sec. VIII, Div. 1? The design pressure is 30 psig, so I believe Sec. VII would apply.

 

[blacksmith37]

A 212-A will be lower strength than B, but I can't remember a number, possibly as low as 30,000. Do you have a "flange" or "fire box" quality ? That is how "fine grain" (now A516) was differentiated from "coarse grain" (now A 515). Either way , I would recommend toughness (Charpy V) testing of this material .

 

[metengr]

Here is some background information on SA 212

The A-212 was melted to flange and firebox qualities, it could be purchased in the coarse grain or fine grain condition. The maximum thickness for the flange quality plates was two inches; the firebox quality was eight inches. Plate over two inches were treated to produce grain refinement either by normalizing or heating uniformly for hot forming. The A-212 plate was intended for welding. It came in two strength levels, Grades A and B. The Grade A tensile requirements were 65,000psi to 77,000 psi, with a minimum yield strength of 35,000 psi; Grade B required a tensile strength of 70,000 psi to 85,000 psi and a minimum yield strength requirements of 38,000 psi.

If the SA 212 was purchased for Section VIII, Div 1 application, it would most likely have A 300 specified for low temperature service.

 

[jte]

In addition to metengr's background, the allowable tensile stress for Section VIII (1962) was 16,250 psi.

jt

 

[meca]

Thank you, this is very helpful information.