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spring steel strip for rolling shutter doors spring

Material: c67s, c70s,c75s,c80s,c75cr1
Thickness of strip: 1.2mm,1.3mm,1.4mm,1.5mm,1.6mm,1.8mm
Width: 40mm,45mm,50mm,55mm,60mm,70mm,80mm
Hardness: 45-48hrc
Surface: grey blue
Edge: rounded
Tensile strength: 1450-1470mpa
1.Chemical composition:
C%:0.65-0.78
Mn%: 0.6-0.9
Si%: 0.15-0.35
S%: ≦0.025
P%: ≦0.025
Tensile strength: 1450-1750MPA
 
2.Production condition:
Hardened and tempered, hardness from 45-47hrc, surface blue with rounded edge.
 
3.Normally grade of the material based on BS, AISI ,EN, DIN, and JIS standard
CS67,CS75,CS80,C75CR1
 
Strip normal size:
1.2*40mm, 1.3*40mm, 1.3*45mm, 1.2*50mm
1.4*50mm, 1.4*55mm,1.4*60mm,1.4*80mm so on

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