Valsningsteknik för extremt höghållfasta tunna stål

Sammanfattning

New high strength steels require improved cold rolling techniques. The aim

of this degree project was to develop a new and money saving cold rolling

technique to manufacture steel strip for saw blades. The work is based on

earlier rolling experiments made with a high carbon steel grade at LuCoil

Steel AB. The work also focused on the mill requirements to cold roll high

strength steels. The results show that LuCoil’s existing cold rolling mill

was actually designed for rolling low carbon steel. To roll high strength

steels the mill must be upgraded with a pair of shapemeters, more coiler

torque and force enough to shift the 1st intermediate rolls during rolling.

During the rolling experiments a right rolling technique to produce strip

with the right properties and without strip breakage wasn’t found. The

reason for this is probably small micro cracks in the strip caused by

excessive reduction. More rolling experiments and material investigations

are necessary.