... 3.springs for doors 4.professional work on cutting rolling shutter roll-up door spring A high-carbon steel ... : DC01, DC03, DC04, DC05, DC06 according to EN Standards CD, DQ, DQSK according to ASTM Standards Enameling Grades: DC01EK, DC04EK ... as per client’s requestForms: Coils, Sheets, stripsApplications: roller shutter, rolling shutter springRaw Material: Baosteel CK67,SAE1065,CS70I.D. Coil: < ...