ck 67 steel strip spring

Rolling shutter spring steel strip is made with hardened&tempered steel strip/coil are also commonly known as H&T steel strip.quenched and tempered is a thermal process that strengthen rolling shutter spring steel strips through controlling heating and colling process,this process of hardening and tempring enhance the mechanical properties of rolling shutter spring steel strip,and increase the toughness of rolling shutter spring steel strips,the hardening process including to heating the steel strip to above the important transformation temperasure for the given material and then promptly cooling,the problem here is that the steel strip this situation is dramatically brittle and so in this way require further treatment in form of quenching this process reheating the rolling shutter sprin steel strip to the lower temperature and hold it at the given temperature for period of time without oxidation.therefore in this way can make the propertites of these rolling shutter spring steel strip are high strength,and hardness,and good toughness and abrasion resistance.it is better application for rolling shutter springs,rolling door springs,band springs.etc.what is more,,because with process of hardned and tempered,it can make sure the best flexibility for rolling shutter door spring when the door rolling down and rolling up the rolling shutter spring strip steel can't be broken when bending