DIN 1628 High Performance Welded Circular Unalloyed Steel Tubes

1. Field of application
This standard applies to welded circular tubes and pipes(hereinafter briefly referred to as "tubes") made of unalloyed steels as listed in table 1. These tubes are predominantly used in the construction of chemical plant, vessels, pipework and for general mechanical engineering purposes. They are designed to meet high performance requirements. Normally there are no limiting values or the maximum permissible working pressure of these tubes. The permission working temperature shall not exceed 300℃ are specified in Appendix A.

2. Steel Grade Symbol
Symbol (Material Number)
DIN 1628 Grade St 37.4 (1.0255)
DIN 1628 Grade St 44.4 (1.0257)
DIN 1628 Grade St 52.4 (1.0581)

3. Designation and ordering
A welded tube conforming to this standard, with an outside diameter of 168,3 mm and a wall thickness of 4mm as specified In DIN2458, made from St52.4 steel (material number 1.0581) shall be designated as follows:
Tube DIN 2458 - 168.3 x 4, DIN 1628 - St 52.4
or Tube DIN 2458 - 168.3 x 4, DIN 1628 - 1.0581

4. The Chemical Composition and Mechanical Properties in details, please check DIN 1628.
5. The tolerance on dimension in details, please check DIN 1628.