Spring Steel Strip

BSS Steel Strip can offer CS70, CS80, C67, C68, C85S according to BS1449, EN 10132 from stock or to customer's own specifications. For a competitive quotation call (0044) 1952 290313 or email Steve for a competitive quotation

Spring Steel Strip

Looking for small quantities of spring steel strip?

Call BSS Steelstrip on 01952 290313, we can help

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	High Carbon Steel Strip

SpSpring steel is a low alloy, medium carbon steel with a very high yield strength. This allows objects made of spring steel to return to their original shape despite significant bending or twisting.

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Spring steel applications

Band saw blades for wood working
Hand Saw, Cross cut saw for wood cutting
Flat springs for automobile clutch plates
Doctor blades for paper industry
Shims and washers for automotive industries
Circular saw blanks
Engineering industry
Masonry and agricultural tools
Industrial knives
Stone cutting
Springs

A spring is a flexible elastic object used to store mechanical energy. Springs are usually made out of hardened steel. Small springs can be produced from pre-hardened (hardened and tempered) stock, while larger ones are made from annealed steel and hardened after fabrication. Spring Steel Strip is quite literally, steel used in the production of springs. This range of steels normally contains between 0.40% and 0.80% carbon, with alloying elements added for the higher integrity products such as automotive clutches etc. Coil springs are normally produced from steel wire, whilst steel strip is used for the production of flat springs. Spring steels are also used in a number of applications where hardness or resistance to bending is required, such as lock parts or tools.

Spring steels are supplied either in the annealed condition for forming and blanking, or in the ready hardened, more commonly referred to as hardened and tempered. Steel supplied in the annealed condition is usually hardened after the stamping and forming operation in component form. The choice of supply condition is determined by the component production method, as ready hardened steel is difficult to process. Hardened and tempered strip is more suitable for flat components or where the production is primarily laser cutting or plain blanking. Hardening in component form is usually however more expensive than the premium paid for ready hardened steel. The hardening and heat treatment of steel is a complex area of metallurgy and beyond the scope of this site, but links for further reference can be located on the right side of the page.

The variety of components produced from spring steel strip is very comprehensive and can be found in many everyday objects, including locks, staplers, furniture, lever files and hand tools. Many more springs are found in automotive and electrical components.

We will add more commonly used spring steels in due course. Please check back at a later date.

The analyses are given for guidance only as the various international standards are not identical, in addition many steelmakers restrict analyses, particularly carbon.

Common Spring Steel Grades Equivalents

Euronorm

Germany

USA

EN 10132 - 4

DIN 17222

BS 1449

SAE

%Mn

%Si

%Al

%Cr

C50E

CK 45

.45-.55

.50-.90

.05-.35

.040 max

.045 max

C50E

CK 50

CS50

1050

.45-.55

.50-.90

.05-.35

.040 max

.045 max

CK 55

1055

.50-0.60

C67S

CK67/C67

CS70

1070

.68 - .73

.60 - .85

.15 - .25

.01 max

.02 max

.20 - .30

C75S

CK75/C75

CS70

1074

.70 - .75

.60 - .80

.15 - .30

.025 max

.02 - .05

.20 - .30

75Cr1

.74-0.80

.65 - 0.80

.25 0.40

.010 max

.025 max

0.30-0.45

C85S

CK85

CS80

1084

.80 - .90

.40 - .70

.15 - .35

.025 max

.40 max

50CrV4

50CV4

735A50

6150

.47-0.55

.70-1.10

.15-0.40

.035 max

.10-.20

CK101

CS95

1095

.90-1.00

.30-.60

.05-.35

.025 max

More detail on Euronorm EN10132 including mechanical properties can be found here

USA AISI and SAE Spring Steels

Grade	% C	% Mng	% P	% S
1050	.47 - .55	.60 - .90	0.04	0.05
1055	.52 - .60	.60 - .90	0.04	0.05
1060	.55 - .66	.60 - .90	0.04	0.05
1065	.59 - .70	.60 - .90	0.04	0.05
1070	.65 - .76	.60 - .90	0.04	0.05
1074	.69 - .80	.50 - .80	0.04	0.05
1080	.74 - .88	.60 - .90	0.04	0.05
1085	.80 - .94	.70 - 1.00	0.04	0.05
1095	.90 - 1.04	.30 - .50	0.04	0.05