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Grade T8
China ISC T10800
Corresponding Standard GB /T 1299-2025
Tool and Mould Steels
Classification Tool Steel
T8 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Cu More
Minimum Value 0.75 0.17 0.1 - - - - Cu+Ni≤0.55
Maximum Value 0.84 0.37 0.4 0.03 0.025 0.3 0.25
T8 Mechanical Properties
condition Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ≤187
Specimen Quenching at 780-800°C, water cooling HRC
≥62
New and Old Grade Replacement List
Corresponding Standard Grade
GB /T 1299-2014
Grade
China ISC
GB /T 1299-2025
Grade
China ISC
1 Approximate Comparison Table Carbon Tool Steel
China Japan International Organization for Standardization European Standard
GB ISC JIS Numerical Grade EN
T8 T00080 SK80 C80U C80U
2 Approximate Comparison Table Non-Alloy Cold-Work Tool Steels
China Japan Germany France European Standard Russia United Kingdom
GB JIS DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
T8 SK5
SK6 		C80W1
C80W2 		Y180 C80U 1.1525 U8 BW1A
3 Approximate Comparison Table Carbon Tool Steel
China Japan United States International Organization for Standardization Germany France Russia
GB ISC JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF GOST
T8 T00080 SK6 W1-0.8C TC80 C80W1 1.1525 Y1 80 У8
4 Approximate Comparison Table Carbon Tool Steel
China Japan South Korea United States International Organization for Standardization Germany
GB JIS KS ASTM ISO DIN EN/DIN
T8 SK5
SK6 		STC5
STC6 		W1A-8 TC80 C80W2
5 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 Commercial Grade ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
T8 T00080 SK 6 SK 80 STC 6 W1A-8 C80U C80W2 1.1625 C80U
C80E2U 		У8-1 1778 C80U
T8 Corresponding Standards(Same grade name, different standards)
1 GB /T 1298-2008
T8 T00080
2 GB /T 1299-2014
T8 T00080
3 ASTM A600-1992(R2010)
T8 A600 T8 T12008
4 GB 3525-1983
T8
5 YB /T 5058-2005
T8
6 HB /Z 136-2000
T8
7 GB /T 1299-2025
T8 T10800

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