Hot Work Tool Steel (เหล็กแข็งงานร้อน)

 

  02-295-1000
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 W303

Bohler W303: Equivalent* 1.2367

 

 Chemical composition (average %)

  C Si Mn Cr Mo V
W303 0.38 0.40 0.40 5.00 2.80 0.55

 

Material characteristic and use

Properties Hot work tool steel featuring excellent hot tensile properties, high retention
of hardness, good toughness and resistance of hardness, good toughness and
resistance to heat checking, admits water cooling.
BOHLER W303 is also available in the special grades ISODISC and ISOBLOC with
improved homogeneity and increased toughness.
   
Application Heavy duty hot work tools and dies, mainly for light alloy processing: mandrels, dies,
and containers for metal tube and rod extrusion; hot extrusion equipment; tools and
dies for the manufacture of hollow bodies, screws, rivets, nuts and bolts.
Die casting equipment, forming dies, die inserts, hot shear blades, and plastic
moulding dies.
   
Hardness after tempering max. 54 HRC
   
As-supplied condition Annealed: max. 205 HB

 

Physical characteristics

    Temperature
    20 ºC 100 ºC 200 ºC 300 ºC 400 ºC 500 ºC 600 ºC 700 ºC
Density (kg/dm3)  7.85          7.69  7.65  
Thermal conductivity W/(m·K)    29  30.4  31.1  31.1  30.4  29.2  28.8
Specific heat J/(kg·K)  460          550  590  
Electrical resistivity Ohm·mm2/m  0.50          0.84  0.94  
Modulus of elasticity 103N/mm2  215          176  165  
Thermal expansion 10-6m/(m·K)    11.5  12.0  12.2  12.5  12.9  13.0  13.2

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

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