SK3 Steel

Water Hardening Tool Steel

Steel JIS SK3

Grade   : SK3
Kategori: Water Hardening Tool Steel
Standard: JIS G4401
Equivalents:
C105U,W5,C105W1,C105E2U,BW1B,C100KU,T10A,1880,N10E,19191,K990,U10A,C105U

Characteristic

SK3 is Water hardening tool steel. Good wear resistance and impact toughness.
The strength and abrasion resistance of SK3 is higher than SK6 , but hot hardness is relatively low. Suitable for manufacturing lower cutting condition and higher wear resistance , and SK3 is not affected by suddenly and violent vibration,

Availability
Roundbar, Flat
Diameter: 12mm – 90
Thickness: 5mm – 30mm

Chemical Composition

JIS Chemical Composition(%)
C Si Mn P S
SK120(SK2) 1.15~1.25 0.10~0.35 0.10~0.50 0.03 0.03
max max
SK105(SK3) 1.00~1.10 0.10~0.35 0.10~0.50 0.03 0.03
max max
SK95(SK4) 0.90~1.00 0.10~0.35 0.10~0.50 0.03 0.03
max max
SK85(SK5) 0.80~0.90 0.10~0.35 0.10~0.50 0.03 0.03
max max
SK75(SK6) 0.70~0.80 0.10~0.35 0.10~0.50 0.03 0.03
max max

Mechanical properties(hot rolled)

Type of steel Hot-rolled Annealed Hardening Tempering
hardness hardness Water quenched Oil quenched Temperature Hardness(HRC)
(HRC) (HRB) 3.15mm max below3.15mm (℃)
Temperature Hardness Tenperature Hardness Water Oil
(℃) (HRC) (℃) (HRC) quenched quenched
SK120 46 98 760~820 63 770~830 60 150~200 63 60
(SK2) max max min min air cooled min min
SK105 45 98 760~820 63 770~830 60 150~200 63 60
(SK3) max max min min air cooled min min
SK95 44 97 760~820 62 770~830 60 150~200 61 59
(SK4) max max min min air cooled min min
SK85 43 97 760~820 62 770~830 60 150~200 59 59
(SK5) max max min min air cooled min min
SK75 40 96 760~820 62 780~840 60 150~200 56 56
(SK6) max max min min air cooled min min
SK65 32 96 760~820 59 780~840 57 150~200 54 54
(SK7) max max min min air cooled min min

Application

SK3 can be used to manufacture all kinds of tools with a certain toughness and the sharp edge, such as tool, cutter, drill bit, Automotive parts, cutter, low accuracy and shape simple measuring equipment (such as card board, etc.), also can be used as wear parts withstanding larger impact.

Steel Product:

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