What are the materials of 1.4408 and 1.4401?

From this decimal form of material grades, we can see that they belong to the standard material grades of German standards. In comparison with the standards of American standards:

1.4408 is equivalent to ASTM A351 CF8M, which is a casting grade, namely the 316 material as we commonly say.

1.4401 is equivalent to ASTM A182 F316, which is a grade for bars and forgings and also belongs to a type of 316 material.