ISO/NP 24270.2

Metallic materials — Sheet and strip — Secondary work embrittlement test method

Scope

This proposal specifies a method for performing the secondary work embrittlement test and the determination of Secondary Work Embrittlement Temperature (SWET) of metallic sheets and/or strips for stamping.
This document is applicable to sheets and coils of steels and/or Al-Mg light alloys, having thicknesses from 0,45 mm to 2,50 mm.
The test includes the preparation of cup samples with specific geometric sizes by deep drawing process. Then, these cup samples are cooled at various low temperature and impacted by using drop-weight test equipment (Recommended impact energy 98J for steel materials and 49J for Al-Mg light alloys respectively). The highest temperature at which no less than 2 cups of the total 8 cups fracture in a brittle manner is determined as Secondary Work Embrittlement Temperature, SWET.