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  • M4 High Speed Steel / HS 6-5-4 / E M4 / SKH 54
  • M4 High Speed Steel / HS 6-5-4 / E M4 / SKH 54

M4 High Speed Steel / HS 6-5-4 / E M4 / SKH 54

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Specification, Chemical & Mechanical Performance

M4 is an extremely versatile high-speed steel with its extremely high carbon and vanadium contents for exceptional abrasion-resistance. It is well suited for premium cutting tools of all types, particularly those used for machining abrasive alloys, castings and heat-treated materials. The high carbon content enables M4 steel to be hardened in excess of 65HRC. However, the high hardness and high vanadium carbide content make it more difficult to grind after heat treatment compared to M2 and other high-speed steels.

Other Known Names: HS 6-5-4, E M4, SKH 54, Stark.

Physical Properties

Density

0.288 lb/in3 (7972 kg/m3)

Specific Gravity

7.97

Modulus Of Elasticity

 

30 x 106 psi (207 GPa)

Machinability

35-40% of a 1% carbon steel

M4 High Speed Steel Chemical Composition

      MAXIMUMTYPICAL
Carbon Chromium Tungsten Molybdenum Vanadium Cobalt Annealed Tempered
C Cr W Mo V Co Hb HrC
1.3 4.25 5.85 4.75 4.1 - 255 65

M4 High Speed Steel Heat Treating

ANNEALINGPREHEATAUSTENITIZINGQUENCHTEMPERING
Temp Temp Temp Medium Temp
°F °F °F   °F
1550/1600 1500/1550 2175/2225 Salt/Oil/Atm 1025/1050

 

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