Designation "T" on old boiler plate steels 1

[22west]

Hi All,

I am looking at a list of old boiler plate steels and find they have a designation of "T" at the end. Example A212-1957T. I believe the 1957 is the year produced (and please correct me if I am wrong on this) - does anyone know what the "T" represents? Reference image attached.

Regards,
22west.

 

[0707]

"High speed steel was invented in 1910 by Frederick Winslow Taylor while he was working with the Bethlehem Steel Company. T1 steel was the first alloy produced from this discovery and was known as AISI. T1 grade steel quickly became an ideal material in the creation of machine parts and cutting tools thanks to its increased durability and resistance to damage."

 

[blacksmith37]

I suspect "T" stands for "tentative" issue of A 212. A 212 is ordinary carbon steel plate . At that time it should also be designated as "flange" or firebox" indicating fine grain practice and not FGP. After looking at the source : A201 is very similar to A212. A283 and A285 have low requirements, it would be difficult for steel not to meet them. None of these steels would be expected to have good toughness . Fine grain practice meant silicon killed not aluminum killed ( for these grades).

 

[Christine74]

I don't know the answer, but here's a link to the OP's source:

https://inis.iaea.org/collection/NCLCollectionStore/_Public/26/030/26030922.pdf

Note that some of these steels say 1952T, 1952aT, or 1974a. I have no idea what the -T, -a, or -aT suffixes mean.


-Christine