Acier rapide M4 / HS 6-5-4 / E M4 / SKH 54
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Spécification, Chemical & Performance mécanique
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.
Propriétés physiques
Densité
0.288 lb / po3 (7972 kg/m3)
densité
7.97
Modulus Of Elasticity
30 x 106 psi (207 GPa)
Usinabilité
35-40% of a 1% carbon steel
M4 High Speed Steel Chemical Composition
| MAXIMUM | TYPICAL | ||||||
|---|---|---|---|---|---|---|---|
| Carbone | Chrome | Tungstène | Molybdène | Vanadium | Cobalt | Recuit | Tempéré |
| 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
| ANNEALING | PREHEAT | AUSTENITIZING | QUENCH | TEMPERING |
|---|---|---|---|---|
| Temp | Temp | Temp | Moyen | Temp |
| ° F | ° F | ° F | ° F | |
| 1550/1600 | 1500/1550 | 2175/2225 | Salt/Oil/Atm | 1025/1050 |
