The rod wire should be drawn of 27 mm to 26 mm . By locally
bad lubrication of the wire in the drawing die, perhaps by demolition of the drawing
agent, shiny places could develop, partly with material abrasion. Because of the
flow behavior influenced unfavorably, the material is locally strong hardened and
heats up. Friction martensite could develop.
27,00 mm round - spheroidised , pickled
drawn to 26,00 mm