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Grade C90U
ISO Numeric Designation 1.1535
Corresponding Standard ISO 4957-2018
Tool steels
Classification Carbon Steel
Density 7.85 g/cm3
C90U Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 0.85 0.1 0.1 - -
Maximum Value 0.95 0.3 0.4 0.03 0.03
C90U Mechanical Properties
Hardness
HBW
Annealed (+A) ≤207
Quenching and Tempering HRC
≥60
1 Approximate Comparison Table
China Japan United States International Organization for Standardization European Standard
GB ISC JIS ASTM UNS Numerical Grade EN
T9 T00090 SK90 W1-8 1/2 T72301 C90U C90U
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
SK5
(SK85)
SK4
(SK95) 		C90U C90U 1.1535 C90U 1.1535
3 Approximate Comparison Table
China Japan United States International Organization for Standardization France Russia United Kingdom
GB ISC JIS ASTM UNS ISO NF EN/NF GOST BS EN/BS
T9 T00090 SK90 W1A-8 1/2 T72301 C90U C90U
C90E2U 		У9-1 C90U
BW1A
4 Approximate Comparison Table
China Japan United States International Organization for Standardization European Standard Russia
GB ISC JIS ASTM UNS ISO EN Numerical Grade GOST
T9 T00090 SK85
(SK5) 		W1A-8 1/2 T72301 C90U
(TC90) 		C90U 1.1830 У9
5 Approximate Comparison Table
China Japan United States International Organization for Standardization European Standard Russia
GB ISC JIS ASTM UNS ISO EN Numerical Grade GOST
T8Mn T01080 SK85
SK85 		W1-C8 T72301 C90U
(TC90) 		C90U 1.1830 У8Г
C90U Corresponding Standards(Same grade name, different standards)
1 DIN EN ISO 4957-2018
C90U 1.1535
2 EN ISO 4957-2018
C90U 1.1535
3 ISO 4957-2018
C90U 1.1535

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