The pipes must be of unalloyed steel and have the characteristics indicated below.
The steels in this table are suitable for welding with the exception of Fe55 steels. In the analysis of the finished product, the deviations provided for by the standard EN10216-1 (ex UNI 663/68) must be taken into account.
The result of the value of the value of the unit yield point must be:
* Orientation values.
** A maximum limit of 47 kgf/mm2 for the unit traction tensile strength is not open to dispute
The test will, as a rule, be carried out only on superior class tubes in accordance with the standards provisions.
Products according to EN 10216-1 (EX UNI 663/68 and DIN 2391 – DIN 1630)
Tolerances according to EN 103015-1 (EX UNI7945)
Certificates according to EN 10204 / 3.1 (EX DIN 50049 / 3.1.B and UNI EN 10204 / 3.1.B)