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Grade C120U
ISO Numeric Designation 1.1555
Corresponding Standard ISO 4957-2018
Tool Steels
Classification Carbon Steel
Density 7.85 g/cm3
C120U Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 1.15 0.1 0.1 - -
Maximum Value 1.25 0.3 0.4 0.03 0.03
C120U Mechanical Properties
Hardness
HBW
Annealed (+A) ≤217
Quenching and Tempering HRC
≥62
1 Approximate Comparison Table Carbon Tool Steel
China Japan United States International Organization for Standardization European Standard
GB ISC JIS ASTM UNS ISO EN
T12 T00120 SK120 W1-11 1/2 T72301 C120U C120U
2 Approximate Comparison Table Non-Alloy Cold-Work Tool Steels
Japan International Organization for Standardization Germany European Standard
JIS ISO DIN EN/DIN W-Nr. EN Numerical Grade
SK120
(SK2) 		C120U C120U 1.1555 C120U 1.1555
3 Approximate Comparison Table Carbon Tool Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB JIS ASTM ISO DIN EN/DIN NF EN/NF EN GOST BS EN/BS
T12 SK120 W1A-11 1/2 C120U C120U C120U C120U У12-1 C120U
4 Approximate Comparison Table Carbon Tool Steel 1
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
T12 T00120 SK2 SK120 STC3 W1A-11 1/2 T72301 C120U C125W2 1.1663 C120U
~C120E3U 		У12-1 1885 C120U
(BW1C)
5 Approximate Comparison Table Carbon Tool Steel 2
China Japan United States International Organization for Standardization European Standard
GB ISC JIS ASTM UNS ISO EN Numerical Grade
T13 T00130 SK140
(SK1) 		W2-C13 T72302 C120U
(TC120) 		C120U 1.1563
C120U Corresponding Standards(Same grade name, different standards)
1 DIN EN ISO 4957-2018
C120U 1.1555
2 EN ISO 4957-2018
C120U 1.1555
3 ISO 4957-2018
C120U 1.1555

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