... roll:upto 4000mm,Dia :upto 1000mm ISO:9001-2000 cold rolling mill rolljinyu cutting tools Co.,Ltd division is accredited with ISO ... generally imported from renowned sources from worldwide and is checked for – macro structure analysis, micro structure analysis, ultrasonic soundness ... proper depth of hardness. The rolls are finally inspected for –Surface hair-line cracks by magnetic particle testing,Sub ...