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Grade SK85
Old Grade
Corresponding Standard JIS G 4401-2006
Brand/Supplier
Japan -> NSSC
-> BAOSTEEL
Classification Tool Steel
SK85 Chemical Element Composition Content (%)
  Component C Si Mn P S
本标准 Minimum Value 0.8 0.1 0.1 - -
Maximum Value 0.9 0.35 0.5 0.03 0.03
  Component C Si Mn P S Cr Ni Cu
新日铁 Minimum Value 0.8 0.1 0.1 - - - - -
Maximum Value 0.9 0.35 0.5 0.03 0.03 0.3 0.25 0.25
  Component C Si Mn P S
宝钢 Minimum Value 0.8 - - - -
Maximum Value 0.9 0.35 0.5 0.015 0.025
SK85 Mechanical Properties
product form Heat Treatment or Condition
Hardness
HBW
Hot-rolled steel plate (Baosteel) Hot Rolling HV
≤370
Hot-rolled steel plate (Baosteel) Annealing HV
≤180
Hot-rolled steel plate (Baosteel) Water quenching 760~850°C HRC
≥60
Hot-rolled steel plate (Baosteel) Oil quenching 790~880°C HRC
≥58
1 Approximate Comparison Table
China Japan United States
GB ISC JIS ASTM UNS
T8Mn T01080 SK85 W1-8 T72301
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States Germany Russia
GB ISC CNS JIS KS Commercial Grade DIN EN/DIN W-Nr. GOST
T8Mn T01080 SK 5 SK 85 STC 5 W1C-8 C85WS 1.1830 У8Г-1
3 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
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
T8Mn T01080 SK85
SK85 		W1-C8 T72301 C90U
(TC90) 		C90U 1.1830 У8Г
SK85 Corresponding Standards(Same grade name, different standards)
1 JIS
SK85
2 JIS G 4401-2006
SK85 (SK5)

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