... roll:upto 4000mm,Dia :upto 1000mm ISO:9001-2000 cold rolling mill rolljinyu cutting tools Co.,Ltd division is accredited ... and hardness. Right from the raw-material inspection, to heat treatment ,to grinding and final dispatch, all rolls undergo ... analysis, micro structure analysis, ultrasonic soundness and heat-treatment response. Proper heat-treatment cycles ensure hardness uniformity and proper depth ...