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.
At BSS Steelstrip, we stock the following grades, which can be supplied from stock in small quantities:-
Stainless Steels- Type 420 Martensitic Stainless Steel. Type 301 Austenitic Stainless Steel.
For all enquiries contact BSS Spring Steel Strip – 0114 244 0527 or email bss@steelstrip.co.uk
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
UK
USA
EN 10132 – 4
DIN 17222
BS 1449
SAE
%C
%Mn
%Si
%S
%P
%Al
%Cr
%V
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
.025 max
.02 – .05
.20 – .30
–
75Cr1
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
.025 max
–
.40 max
–
50CrV4
50CV4
735A50
6150
.47-0.55
.70-1.10
.15-0.40
.035 max
.035 max
–
–
.10-.20
CK101
CS95
1095
.90-1.00
.30-.60
.05-.35
.025 max
.025 max
More detail on Euronorm EN10132 including mechanical properties can be foundhere
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
Due to numerous requests below I have added some of the older spring steel grades which are often quoted
Old BS970 spring steels
Euronorm
Germany
UK
USA
BS970
%C
%Mn
%Si
%S
%P
%Al
%Cr
%V
En8
0.35-0.45
0.60-1.00
0.05-0.35
0.06max
0.06max
En8a
0.33-0.38
0.70-0.90
0.05-0.35
0.06max
0.06max
–
–
En9
0.50-0.60
0.50-0.90
0.05-0.35
0.06max
0.06max
En 42
0.70-0.85
0.55-0.75
0.10-0.40
0.06max
0.06max
–
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