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DIN is a leading German national organization for standardization

DIN specifications are standards of federal importance which precede development of international documents

DIN EN is a German version of European standard which is applied without any corrections by all members of European Committee for Standardization (CEN)

DIN 2391 – Seamless precision steel tubes (Steel grades st34-2, st37-2, st44-2)

DIN 1629 – Seamless carbon steel tubes for special purposes

DIN 11850 - Tubes for the food, chemical and pharmaceutical industry - Stainless steel tubes

DIN 17457 – Stainless austenitic steel tubes for special purposes

DIN 17121 – Circular seamless non-alloy steel tubes for special purposes