1. There is no difference in the material composition between A105 and A105N in the ASTM A105/A105M standard for welded pipe material. It is only specified in the standard,
When the order has auxiliary requirements for heat treatment, add letters after A105. The letters are: A-annealing, N-normalizing Normalizing, NT-normalizing and tempering Normaling+Tempering, QT-quenching and tempering Quenching+ Tempering.
2. There is not much difference between A105 and A105M in ASTM A105/A105M. Do not think that there is a change in the material. In fact, the unit is not the same when supplied. The indication without M is supplied in English units, while the representation with M is in metric system. The unit is supplied, and other standards such as ASTM A193/A193M, A351/A351M, etc. are all relevant.
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