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What is Spring Steel Strip
Latest company news about What is Spring Steel Strip

What is Spring Steel Strip?

 

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.

 

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 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

 

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    
 
                       

 

 

Pub Time : 2022-09-13 11:22:24 >> News list
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