Is A106 a Cast Pipe

A later process is perhaps more relevant than an earlier process. In particular, a later non-casting process for making pipe might render irrelevant an earlier ingot-casting process for the raw material. (Just a guess.)

As A 106 gr B pipe is made of Ingots which is made of casting

which is made from iron Ore. So why these are not called hematite pipes?

Did you study the total process of pipe making ? There are some very important steps which makes the pipe what they are and not cast cylinders.

Both great answers guys. oP, the term cast is not valid as a product descriptor for the pipe, since it was not cast into final shape the ingot was cast ino its shape, then rolled (wrought or shaped) in a rolling mill into an rb (round billet) was then wrought by piercing and rolling into final seamless product.

these days ingots are rare, most likely was continuous cast bloom or billet originally.

The pipe was rolled(wrought) into final form, not cast into it. Therefore it is not a casting.

milo