High quality CK67 spring steel strip for Rolling shutter door

Standard:

AiSi, GB

Steel Grade:

65Mn,#50,#40,CK50 CK55 CK60 CK67 CK70 C75 Cr1

Thickness:

0.15-2.5mm

Place of Origin:

Jiangxi, China

Technique:

Hardened and tempered,cold rolled,annealed

Surface Treatment:

polished blue or unpolished blue

Width:

40-80mm

Color:

Grey blue,polished blue,black

Edge:

Round edge or slit edge

Size:

Thickness(1.0-1.6mm),width(40-80mm)

Hardness:

HRC44-49

Tolerance:

thickness: +/-0.01mm, width: +/-0.1mm