Steel strips shutter spring 1.3x60mm

steel strips shutter spring is made with hardened and tempered spring steel strip,which is use the best raw material of ck67,ck70,ck75,sae1070,1074 to produce it by an unique process through controlling heating and colling.this process of hardnening and tempering improve the mechanical properties of steel strip rolling shutter spring.the hardening process involes heating the steel strip to above the critical transformation temperature for the given grade adn then rapidly cooling.and this type of steel strip shutter spring has high degree of toughness and has excellent spring properties,therefore,it can widely used for rolling shutter spring,rolling door spring,shutter spring,rolling door band springs,steel springs,flat springs.etc.