Ultimatley, I would like to calculated torsion forces viewed by the mandrel on a down coiler. My boss is convinced that material properties effect the forces seen at the madrel. More robust material equates to more torque.
The grades envolved are everything from plain carbon steels, Mn...
What equation or theory would I use to calculate the yield strength and/or tensile strength of a material at an elevated temperature? Given: Yield strength at room temp; grade/chemistry; and desired elevated temperature.
Grades - high carbon (0.50 and higher); 4130; 10B38
Hot Process - CSP caster into a 7 stand rolling mill. Approximatley 1600 finishing temp and 1190 coiling.
No processing prior to pickling; no scale breaker at pickle line either.
Has anyone come against a problem called onion skin, aka kish? This problem is a formation of a difficult to pickle scale on primary steel.
Let me know if anyone has heard or solved this problem.