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고속공구강강재 탄소공구강강재  
HIGH SPEED TOOLS STEELS

  1.Application

These standards regulates high speed tool steels (hereafter steels) made through either hot rolling or forging.

  2.Types

There are 13 types of steel and their symbols are as shown in (table 1).

*[table1]
Symbols for different types
and their classification		 sort
SKH 2
SKH 3
SKH 4(1)
SKH 10		 High speed tool steels of tungsten grade
SKH 51(1)
SKH 52
SKH 53
SKH 54
SKH 55
SKH 56
SKH 57
SKH 58
SKH 59		 High speed tool steels of molybdenum grade
Note(1) SKH4 is the SKH4A of old standards and SKH51 is the SKH9 of old standards.

  3.Production method

Chemical component will be defined by ladle analysis and their level will be in accordance with table2.

*[table2]
Symbols for each type Chemical component% For reference
C Si Mn P S Cr Mo W V Co
SKH 2 0.73
~0.83
 0.40 0.40 0.030 0.030 3.80
~4.50 		- 17.00
~19.00 		0.80
~1.20 		- various other general
cutting purpose tools
SKH 3 0.73
~0.83 		0.40 0.40 0.030 0.030 3.80
~4.50		 - 17.00
~19.00		 0.80
~1.20		   4.50
~5.50 		various other
high-speed
cutting tools
SKH 4 0.73
~0.83 		0.40 0.40 0.030 0.030 3.80
~4.50		 - 17.00
~19.00		 -1.00
~1.50		 9.00
~11.00		 various other hard
material cutting tools
SKH 10 1.45
~1.60		 0.40 0.40 0.030 0.030 3.80
~4.50		 - 11.50
~13.50		 4.20
~5.20		 4.20
~5.20		 various other very hard material cutting tools
SKH 51 0.73
~0.83
 0.40 0.40 0.030 0.030 3.80
~4.50 		4.50
~5.50 		5.50
~6.70 		1.60
~2.20		 - Various other general purpose cutting tools that requires tenacity
SKH 52 0.73
~0.83 		0.40 0.40 0.030 0.030 3.80
~4.50		 4.80
~6.20 		5.50
~6.70 		2.30
~2.80		 - Various other high speed cutting tools that prefer tenacity
SKH 53 0.73
~0.83 		0.40 0.40 0.030 0.030 3.80
~4.50		 4.60
~5.30		 5.50
~6.70 		2.80
~3.30 		- "
SKH 54 1.45
~1.60		 0.40 0.40 0.030 0.030 3.80
~4.50		 4.50
~5.50 		5.30
~6.50 		3.90
~4.50 		- "
SKH 55 0.73
~0.83
 0.40 0.40 0.030 0.030 3.80
~4.50 		4.60
~5.30 		5.70
~6.70 		1.70
~2.20		   4.50
~5.50		 Various other high speed cutting tools that prefer tenacity
SKH 56 0.73
~0.83 		0.40 0.40 0.030 0.030 3.80
~4.50		 4.60
~5.30		 5.70
~6.70 		1.70
~2.20		 7.00
~9.00		 "
SKH 57 0.73
~0.83 		0.40 0.40 0.030 0.030 3.80
~4.50		 3.00
~4.00 		9.00
~11.00		 3.00
~3.70		 9.00
~11.00		 "
SKH 58 1.45
~1.60		 0.50  0.40 0.030 0.030 3.50
~4.50		 8.20
~9.20 		1.50
~2.10		 1.70
~2.20 		-   Various other general cutting tools that requires tenacity
SKH 59 1.45
~1.60		 0.50  0.40 0.030 0.030 3.50
~4.50		 9.00
~10.00		 1.20
~1.90 		0.90
~1.40		   7.50
~8.50 		Various other high speed cutting tools that prefer tenacity
Note all types must not have over 0.25% of Cu as impurities