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Grade Ck55
Germany W-Nr. 1.1203
Old Grade
Corresponding Standard DIN 17222-1979
Cold Rolled Steel Strips for Springs Technical Condition of Delivery
Classification Carbon Steel
Ck55 Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 0.52 0.15 0.6 - -
Maximum Value 0.6 0.35 0.9 0.035 0.035
Ck55 Mechanical Properties
thickness
t
mm		 Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
t≤3* Cold Rolled + Soft Annealing (G) ≤610 ≥13 HV**
≤180
t≤2**** Cold Rolled + Quenching + Tempering (H+A) ***
1150~1650		 340~490
t≤2 Quenching ≥650
1 Approximate Comparison Table High-Quality Carbon Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
55 U20552 S55C S55C SM55C 1055
(ASTM) 		G10550 C55E4 C55E
Ck55 		1.1203 C55E
XC55 		55 1665 C55E
070M55
2 Approximate Comparison Table Plastic Mold Steel
China Japan United States International Organization for Standardization Germany Sweden
YB GB ISC JIS ASTM/AISI ISO DIN EN/DIN W-Nr. SS
SM55 SM55 T10550 S55C 1055 C55E4 C55E 1.1203 1665
3 Approximate Comparison Table Spring Steel
Germany France European Standard United Kingdom
DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade BS EN/BS
Ck55 1.1203 C50RR C55S 1.1204 CS50
4 Approximate Comparison Table High-Quality Carbon Structural Steel
Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
S55C 1055 C55E4 Ck55 XC54
XC55H1 		C55E 1.1203 55 070M55
Ck55 Corresponding Standards(Same grade name, different standards)
1 DIN 17200-1987
Ck55 1.1203
2 DIN 17222-1979
Ck55 1.1203 (Ck53)
3 DIN 17204-1990
Ck55 1.1203

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