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Fastons to be welded Strips for finned Elements
 TECHNICAL REFERENCE STANDARDS

DIN 17441

Raw material technical specifications (strips)

 

DIN 17457

General reference standard for circular-electowelded austenitic stainless steel tubes

 

DIN 54141

Process control (Eddy Current or Foucault current tests), with cutting and automatic selection of tube with possible surface defects.
Non destructive tests, carried out on the production line



ASTM A 249/A

Technical reference standard for heat-treated tubes used in heat exchangers and boilers.

DIN 10234

Diameter expansion tests, 30% minimum, without detecting cracks
Destructive tests, performed out of the production line

 

DIN 10233

Back bending tests of the welding area
Destructive tests, performed out of the production line