
A pattern of parallel surface cracks that are formed by alternate rapid heating and cooling of the extreme surface metal, sometimes found on forging dies and piercing punches. There may be two sets of parallel cracks one set perpendicular to the other.
Found on
http://www.encyclo.co.uk/local/20742

A pattern of parallel surface cracks that are formed by alternate rapid heating and cooling of the extreme surface metal, sometimes found on forging dies and piercing punches. There may be two sets of parallel cracks one set perpendicular to the other
Found on
http://www.encyclo.co.uk/local/21115

Fine cracks in the forging dies caused by excessive heat or extended use without polishing. The pattern of these heat checks is reproduced on the forged part.
Found on
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

A pattern of parallel surface cracks that are formed by alternate rapid heating and cooling of theextreme surface metal, sometimes found on forging dies and piercing punches. There may be two sets of parallelcracks, one set perpendicular to the other.
Found on
https://www.encyclo.co.uk/local/20687
No exact match found.