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Grade Ck25
Germany W-Nr. 1.1158
Corresponding Standard DIN 17200-1987
Classification Carbon Steel
Ck25 Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 0.22 - 0.4 - -
Maximum Value 0.29 0.4 0.7 0.035 0.03
Ck25 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
Steel; All Sizes Softening Annealing (G) ≤156
Steel; d≤16 Quenching and Tempering (V) 550~700 ≥370 ≥19 ≥45 ISO-V
≥45
Steel; 16<d≤40 Quenching and Tempering (V) 500~650 ≥320 ≥21 ≥50 ≥45
Flat steel; d≤16 Normalizing (N) 420~570 ≥260 Longitudinal
≥25
Flat steel; 16<d≤100 Normalizing (N) 420~570 ≥240 ≥25
Flat Steel; 100<d≤160 Normalizing (N) 400~550 ≥220 ≥23
New and Old Grade Replacement List
Corresponding Standard Grade
DIN 17200-1987
Grade
Germany W-Nr.
DIN EN ISO 683-1-2018
Grade
1 Approximate Comparison Table High-Quality Carbon Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
25 U20252 S25C S25C SM25C 1025 G10250 C25E4 C25E
Ck25 		1.1158 C25E
XC25 		25 C25E
070M26
2 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
Japan International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
S25C C25E4 Ck25 XC25 C25E 1.1158 25 070M26

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