Dalian Jingtai Industry Trade Co.,Ltd |
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FEATURES: M4 high-speed steel is an extremely versatile high speed steel that provides a unique combination of high wear resistance with high impact toughness and transverse bend strength. A large volume of vanadium carbides provides the high wear resistance. The high impact toughness and high transverse bend strength are results of the fine grain size, small carbides, and superior cleanliness of the pwder metallurgy (PM) microstructure.
APPLICATIONS: Twist drills, wood working tools,saws,aviation high temperature bears,etc.
COMPOSITION
C | Mn | Si | Cr | W | Mo | V |
1.30 | 0.32 | 0.29 | 4.10 | 5.50 | 5.10 | 4.10 |
SIMILAR BRAND
GB | ASTM | DIN | UNS |
W6Mo5Cr4V4 | A600 | ----- | T11304 |
METALLURGY METHOD:
NON-VACUUM FURNACE + LF FURNACE + ESR
PHYSICAL PROPERTYS:
Density: 0.286 lb/in3 (7916 kg/m3)
Specific Gravity: 7.92
Modulus of Elasticity: 31 x 106 psi (214 GPa)
Machinability: 40-45% of a 1% carbon steel
MACHINABILITY
The machinability of M4 steels is comparatively low rating about 40% than that of water hardening tool steels which are much easier to machine.
HEAT TREATING INSTRUCTIONS
Critical Temperature: Ac1: 840℃
Quenching:
Pressurized gas, warm oil, or salt. For pressurized gas, the furnace should have a minimum quench pressure of 4 bars. A quench rate of approximately 222℃ per minute to below 538℃ is critical to obtain the desired properties.For oil, quench until black, about 482℃, then cool in still air to 66-51℃.For salt maintained at 538-593℃, equalize in the salt, then cool in still air to 66-51℃.
Tempering:
Temper immediately after quenching. Typical temperature range is 538- 593℃. Do not temper below 538℃. Hold at temperature for 2 hours then air cool to ambient temperature. Double tempering is required. Triple tempering is required when austenitized at 1149℃ or higher.
ANNEALING
Annealing must be performed after hot working and before re-hardening.After annealing the hardness is no more than 269HB.
STANDARD SIZE & SURFACE CONDITION
Round Bar: Diameter 1.5mm to 200mm
Flat Bar: Width120mm
Plate: Width1000mm, length2000mm
Surface Condition: Black or Polished Bright (h9)