High Speed Steel (เหล็กแข็งไฮสปีด)

 

  02-295-1000
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 S790 PM

Bohler S790 PM: Equivalent* M3 Cl.2, 1.3345, DEX20, HAP10

 

 Chemical composition (average %)

  C Si Mn Cr Mo V W
S790 PM  1.29 0.60 0.30 4.20  5.00 3.00  6.30

 

Material characteristic and use

Properties High speed steel produced by powder-metallurgy methods with good red hardness,
compressive strength and wear resistance.
The PM technology imparts to the material also excellent toughness and
machinability properties, e.g. highly satisfactory grindability.
   
Application Heavy-duty machining tools
Not only for the machining of steels but also for nonferrous metals such as nickel-
base and titanium alloys. e.g. shaper cutters, hobs, milling cutters, broaching
tools of all types, taps, twist drills, chasing tools, reamers, bimetal strips for
saw blades.
Tools used under extreme compressive stress
e.g. precision blanking tools for high-strength materials
   ● shaping punches
   ● dies
   
Hardness after tempering 64-66 HRC
   
As-supplied condition Annealed: max. 280 HB

 

Physical characteristics

    Temperature
    20 ºC 100 ºC 200 ºC 300 ºC 400 ºC 500 ºC 600 ºC 700 ºC
Density (kg/dm3)  8.0              
Thermal conductivity W/(m·K)  24.0              
Specific heat J/(kg·K)  420              
Electrical resistivity Ohm·mm2/m  0.54              
Modulus of elasticity N/mm2  230x103              
Thermal expansion 10-6m/(m·K)    11.5  11.7  12.2  12.4  12.7 13.0  12.9

* Chemical composition is only reference and might not be the same

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