Stahlinstitut VDEh https://vdeh.de/en/standardisation/stahl-eisen-blatter/stahl-eisen-prufblatter/sep-1680/ – 11.08.2026

SEP 1680

Drawing time-tem­per­ature-trans­form­a­tion diagrams for ferrous alloys

A CCT diagram makes state­ments about the devel­op­ment of the micro­struc­ture of a steel during pro­cessing or heat treat­ment. This Stahl-Eisen test spe­cific­a­tion (SEP) contains guidelines for drawing such diagrams. The dif­ferent types of diagrams are described. Spe­cified are specimen selec­tion and pre­par­a­tion, test methods and inter­pret­a­tion of test results. An Annex provides dif­ferent example diagrams.

Compared to the 3rd edition the fol­lowing sig­ni­ficant changes are executed: This SEP is avail­able with English trans­la­tion for the first time. Atten­tion was paid to a clear present­a­tion, e.g. for form­a­tion.

4^th edition October 2024