not sure this may help or not, but you can try. here is what I found from the net:
"DIN EN ISO 11970 (for welding procedure specifications for steel castings) or DIN 17205 (which is an older German standard for steel castings) may include more detailed guidelines or references to cast-on test samples".
"If none of the above resources provide the exact recommendation, a general approach for cast-on test samples for steel castings is to follow the principles of ASTM A370 for mechanical testing, as they sometimes align closely with DIN methodologies".
R.Efendy