why the strip steel of rolling door spring is broken when bending
Why the strip steel of rolling door spring is broken or cracking when bending,the reason is
2)the hardness is uniform
3)the quality of raw material
4)the process of heat treatment with annealed,hardened and tempered
5)the temperature of quenched and tempered.
Our factory is professional manufacture in rolling shutter spring steel over 10 years,so we understand that the flexibility is the key for rolling door spring when the door rolling down and rolling up and strip steel can't be broken when bending,our company,every year,exports hundreds of tons of strip steel worldwide for this use and we have great experience,knowing how to solve these problems and to avoide this problems,from first-rate raw material,cold rolling,quenching and tempering process.each production step,is checked carefully in width,thickness,hardness,edge as flexibility spring steel strip.
