ASTM A-212-B Firebox vs. ASTM SA515 and SA516 1

[kaygoforth]

I am developing an API 510 package for a client who wants to modify a 1966 vessel fabricated from A-212-B Firebox Steel. Thicknesses run from 0.875" (reinforcing pad) to 1.625" (shell thickness. This vessel will require an MDMT of 30 degrees F. I have heard from various experienced engineers that say that the Firebox variety of the old A-212-B is essentially SA-516-70. However, the ASTM website goes into no detail, and says only that A-212 has been replaced by SA-515. This is an old vessel, and all that remains of documentation is the drawing itself. If the material being used is truly equivalent to A515, then we run the risk of fractures due to lower temperatures. If it is truly equivalent to A516, I need documentation of that fact, not just the "say-so" of an "expert". In addition, at least some thicknesses of A212 were normalized, and I could really use finding out if the above listed thicknesses were included in those thicknesses.

 

[VeryPicky]

Hi,Kaygoforth

Could you give me the address to that ASTM website that describes the A-212 B?

 

[metengr]

No, these are not considered equivalent materials. I have an ASTM Standards, 1958 Edition. The ASTM A 212 "High Strength Carbon-Silicon Plates for Boilers and Other Pressure Vessels" lists the properties for Grade B as follows;

Carbon - 0.31% max (plates 1" and under)
0.33% max (plates over 1" and under 2")

Mn - 0.90% max

P - 0.035% max firebox quality

S - 0.04% max firebox quality

Si - 0.15 to 0.30%


Tensile strength - 70 to 85 Ksi
Yield point - 38 Ksi min
Elongation - 2" gage - 22% firebox quality

Plates over 2" in thickness were required to be treated to produce fine grain by normalizing. Under 2" thickness, it was up to the plate manufacturer to provide for grain refinement.

 

[unclesyd]

Check this website it shows the withdrawal and references A515 as the replacement.
A212 Grade A & B is recommended down to -50°F if it is to A300 Specifications:
A300- Withdrawn 1975: Specification for Notch Toughness Requirements for Normalized Steel Plates for Pressure Vessels; Withdrawn No Replacement

http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/WITHDRAWN/A212.htm?E+mystore

Look on the left side of the page there is a place to get a copy of the withdrawn standards.


The usage data came from a US Steel book “Low Temperature and Cryogenic Steels” The 1965 ASME Book limits it’s use to -20°F
Both Bethlehem and USS have the A212 plate only listed as normalized.