... bits,tunneling tools,auger bits,auger drilling bits,doundation drilling,rock drilling tools,excavator parts,ground engaging tools,earthmoving equipments,construction ... ≥2.520°C≥17J47-52 -40°C≥11J Grade 2≥1400≥320°C≥20J47-52 -40°C≥14J Grade 3≥1400≥320°C≥22J47-52 ... -40°C≥17J J300 1U3302RC ROCK CHISEL ...