I have looked in most of my reference material, and will continue to do so, and yes, I have googled it.

Having said that, and still coming up empty handed, can someone tell me about, or refer me to where I can find out about this carbon steel material.

My interest is on welding issues, and my application is a 50 year old utility HP feedwater heater channel body and nozzle(s).  This heater is dead, (beyond repair) and we are considering welding a plug in the inlet/outlet nozzles until (1) the rest of the plant around it dies as well, or (2) it is replaced (which is not going to happen).

The nozzle thickness is 1-3/4" or 45mm.  Design pressure is 3450 PSIG, and determining the thickness of the plug required is not a problem.

>>>>>>>>>>>>>>>>>>>filter

Someone out there has an index of ASTM standards that should cross reference the standard.
According to the code book I have it is a P1 material.  Also I have two old welding electrode handbooks that also call it a P1 material neither have a welding spec for it.
One calls for E7018 and the other E8018.

I'm still looking for other information.

I have a reference of SA266 to UNS K03506 and it is a C-Si steel.
It has a references to being covered under Sec IX QW-422 and non-nuclear code case 1876
It is P1 Gr 2.
It also references SA541 Cl 1 for Gr1 but doesn't appear to reference Gr2, but lumps SA266 Gr1&2 togather.

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