Another concern is corrosion fatigue (CF). ASME B31.1 (code case 182) issues a cautionary note regarding CF of WB36, and lists factors like temperature, dissolved oxygen content, likely strain rates, etc. to be considered before deciding on the use of this material in headers and pipes.
metengr, it seems that WB36 is listed as a code case in ASME Section I (code case 2353) since 2001 and Section VIII (Div. I & II) is in progress (according to V&M). Then does it not qualify for use as headers or piping?
Thanks rp, I see your point now!
BTW, impact test is optional for this particular grade, but when performed, it has to be at least 27 J (Charpy value at RT). I do not have much feel for these numbers, is it too high or just typical?
After all these discussions, I now have another question...
kumkumvijay and metengr: thanks for your detailed explanations!
weldstan: Yes, that could be the reason why our vendor cannot supply CR plates below 40 mm. However, since the customer wants CR plates for thicknesses below 40 mm (and accepts NR for > 40 mm), to convince him otherwise (that is...
I believe welding does much more than changing the carbon concentration locally. If T95 has a tempered martensite structure (like P91) which ensures better (high temperature?) properties, welding will certainly destroy that very microstructure (because it involves melting/solidification and...
First, thank you all for your help and pointing out things I did not consider. Much appreciate!
Apologies for my muddled understanding too - please bear with me as I still cannot understand a copuple of things:
Agreed that CR cannot achieve the same high toughness if section thickness is...
I came across the terms "controlled rolling" (CR) and "normalized rolling" (NR) in the Indian Standard IS 2062 for hot rolled (HR) medium and high tensile structural steel specification while looking specially at a Fe-.22C-1.5Mn-.4Si steel (E250-GrBr50).
According to the standard, CR is a HR...
