1,The material of the links is 20CrMnTi. The diameter of the steel bar of the links is from 12mm to 20mm.The inner diameter of the respective links is 50mm.55mm,60mm,65mm(the
maximum)
   And the link is neither casting nor forging. The steel mill directly makes the rolled steel ,then after our heat-treatment, we make the links .The size of the links is up to
   the wheel size.
2 About the friction pieces, we quote you mainly based on the castings. We have developed successfully the forging years ago, however, the cost of the forging is 20% higher
than the castings.
3 About our casting working life, it depends on different working environment. Normally, the casting can work at least 3000 hours in general mining plant. Our Forging ,the
working life is twice longer than the casting ,6000hours.For example, the working life of castings in quartz sandstone environment is 2000-2500 hours, for forging it is
4000-5000 hours. But the life of castings in limestone environment is 4000-16000hours,for forgings, it is 8000-32000hours.
4 For every chain to be exported, we will send another 16 repair parts with the chain.