Abstract
In TM‐rolling of strip and plate the mill parameters can be adjusted such that reversible temper embrittlement (RTE) happens. This leads, together with the TM‐typical grain elongation, to a special fracture appearance which consists of sub‐fracture (split, separation) formation starting from the main fracture plane. The lower toughness in the thickness direction is connected with a sloping shelf of the otherwise sigmoidal energy temperature curve of impact bending tests with ISO‐V(CVN) specimens. It is shown how RTE can be avoided, namely by low phosphorus contents of the material and/or by low coiling temperatures at strip rolling. Accelerated cooling of plates can avoid RTE, but care must be taken not to produce plates with lower toughness.
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