Material 1.1248

Spring steel

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1.1248

Standards

HDIN / EN US-Standard AFNOR UNI JIS request
C75S Ck75 AISI 1070 AISI 1074 AISI 1075 AISI 1078 UNS G10700 UNS G10740 UNS G10750 UNS G10780 C75 S75CM request

Material Category: Spring steel

Applications

As cold-rolled steel strips for springs with high dimensional accuracy and surface finish

Heat Treatment

Austenitizing 810 - 840 C°, cooling oil

Chemical Composition

C % Si % Mn % P % S % Cr % Mo % Ni %
0,70 - 0,80 0,15 - 0,35 0,60 -0,90 max 0,025 max 0,025 max 0,40 max 0,10 max 0,40

 

Product Specifications

DIN EN 10132-4

Mechanical Properties

weichgeglüht  0,2% Dehngrenze (Rp0,2) Zugfestigkeit (Rm) Bruchdehnung (A 80 mm) Härte (HV) Härte (HRB)
0,3 - 3 mm <= 510 N/mm² <= 640 N/mm² >= 15 % <= 200 HV <= 93 HRB
gehärtet Härte (HV) Härte (HRC)
0,3 - 3 mm >= 700 HV >= 60 HRC
vergütet  Zugfestigkeit (Rm) Härte (HV) Härte (HRC)
0,3 - 3 mm 1200 - 1900 mm²    
0,3 - 0,5 mm   520 - 570 HV  
0,5 - 0,75 mm   500 - 550 HV  
0,75 - 1 mm   480 - 530 HV  
1 - 1,5 mm   465 - 515 HV  
0,3 - 3 mm   435 - 485 HV  
      38,5 - 54 HRC
kaltgewalzt Zugfestigkeit (Rm) Härte (HV)
0,3 - 3 mm <= 1.170 N/mm² <= 320 HV 

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