Composite tool steel rolls


Texture profile

Bimetallic composite tool steel composite casting process to produce a full flush, the outer layer having excellent thermal fatigue, thermal wear and thermal shock resistance of tool steel, the core having a high strength steel.

Kind of roll with a differential heat treatment process to obtain optimal organizational performance, the outer layer has a high, uniform hardness, in particular, has a very excellent resistance to thermal cracking performance.

Main application

  • Work rolls for 2Hi roughing mills.
  • Plate mill, two-roll mill Steckel roughing work rolls

Performance Characteristics

  • It has excellent thermal fatigue resistance, with only slight contact with hot slab thermal cracking and crack propagation slow heat.
  • Has excellent high temperature wear resistance, the machine for a long time, rolling volume.
  • High roll neck strength, guaranteed to have higher security during the roll when large reduction rolling slab.

Microstructure

composite tool steel

Performance Indicators

Performance index Units Numerical Value
Hardness HSD 60-75
Tensile strength MPa 900-1200
Thermal conductivity Wm℃.at 500℃ 35-38
Swell factor 10-6/℃ 10-13
Young modulus 104MPa 21-22
Poisson’s ratio 0.25-0.30
Density Kg/m3 7800
Specific heat capacity J/g℃ 0.489