C75S, CK75, 1.1248, Spring Steel Strip

 

Spring steel strip is used to build springs for a great variety of purposes. Below especially the cold rolled (carbon as well as stainless) spring steel strip will be described in detail. As a matter of course spring steel strip can be slit or cut to length (sheets). We supply a very wide range of high carbon and alloys, covering the most stringent industrial requirements. We have also developed a unique know-how in the design of custom solutions for special applications.

 

75 steel – C75S – Carbon spring steel with low hardening capacity for lightweight springs for oil hardening. It is characterized by resistance to abrasion and high strength. Used for low-loaded springs and springs, spring parts, clock springs, saws for cutting stones in the form of tapes and sheets.

 

Dimensions 

Thickness: 0.1 to 10mm

Width: 10 to 1500mm

 

Chemical composition

name	number	C	Si	Mn	P max.	S max.	Cr	Mo max.	Ni
C75S	1.1248	0,70 to 0,80	0,15 to 0,35	0,60 to 0,90	0,025	0,025	max. 0,40	0,10	max. 0,40

 

Mechanical properties

Steel designation		delivery condition
		annealed (+A) or annealed and skin passed (+LC)				cold rolled (+CR)		quenched and tempered (+QT)
name	number	Proof strength max. Mpa	Tensile strength max. Mpa	Elongation % min.	HV max.	Tensile strength max. Mpa	HV max.	Tensile strength Mpa	HV
C75S	1.1248	510	640	15	200	1170	320	1 200 to 1 900	370 to 580

 

Delivery condition

-annealed or annealed and skin passed(+A or +LC);

-cold rolled(+CR);

-quenched and tempered(+QT).

 

Surface finish

1 Grey/blue oxide finish:unpolished;

2 bright tempered:unpolished

3 polished

4 polished and coloured:blue or yellow colour

 

Inspection and testing

verification of the dimensions

visual examination of the surface quality

Chemical analysis

Extent of testing

Tensile and bending tests

Tolerances on shape