EN 10216-1 standard specifies Seamless steel tubes for pressure purposes.

EN 10216-1 standard specifies Seamless steel tubes for pressure purposes.
DIN, the German Institute for Standardization, develops norms and standards as a service to industry, the state and society as a whole.
There are two types of steel tubing: welded and seamless. Either type may be made of any alloy of steel that is formable.