VDA 238-203
Testing of the susceptibility of advanced high strength steel sheets to hydrogen induced cracking - Cup test
Prüfung der Empfindlichkeit höchstfester Flacherzeugnisse aus Stahl gegenüber wasserstoffinduzierter Rissbildung - Napf-Prüfung
Brief description
The cup test is designed to assess the susceptibility of AHSS grades to delayed cracking due to hydrogen induced stress corrosion cracking. Particular consideration is given to production-related influences on the material behavior (for example work hardening by forming, cathodic dip coating) as well as influences from the product life cycle (corrosion). For this test, deep drawn cups are exposed to a corrosive media and the number and type of delayed cracks, if occurring, are evaluated. The cup-test is a test method for sheet steels for automotive applications, especially cold-formable multi-phase steels with a typical thickness range of 0.7 to 2.5 mm.
