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.

>>>>>>>>>>>>>>>>>>>>>gate valve

Just to get you started it is classified as a carbon steel forging material with a minimum tensile of 70,000 #/in^2. It is also a P1 material. ASME 1965

I have some other data and will try to find it and if I remember correctly we used to weld on it.

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.

We had several HP FW heaters some time ago that we retired by cutting and capping the feedwater inlet and outlet piping, and steam inlet and drains. We wanted to completely isolate the heaters because they were junk, and posed a risk of failure. The cutting and capping of the piping posed no problems,it was done by field machining (cutting and prepping in one step), and welding of the pipe caps was performed using ASME Section VIII, Div 1 UCS-56 requirements.

According to the ASME B&PV code 2001 Edition, 2003 Addendum, SA 266 Class 2 is still in effect other than Class 2 is now called Grade 2 per the specification, and is a C-Si forging (0.3% max C, 0.4-1.05% Mn,0.025% P and S, .15-.35% Si). This is a P1 Group 2 material.

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