Diamond grade £  º SMD Main Material £  º  ¦  µ 2* 4 diamond Diamond Concentration £  º 100% HRC £  º 15-20 ¡  ¢ 20-25 ¡  ¢ 25-30 ¡  ¢ 30-35 ¡  ¢ 35-40 ¡  ¢ 40 -45 ¡  ¢ 45-50 Cor e Barrel Designation....
Theory Drilling depth 1000m Outer diameter 89mm Inner diameter 77.8mm Length 3m/ 10ft; 1.5m/ 5ft Raw Material steel grade 30CrMnSia/ XJY850 Standard GB/ T816-2008 Treatment Heat....
Basic Parameters Theory Drilling depth 1500m Outer diameter 70.5mm Inner diameter 60.5mm Length 3m/ 10ft; 1.5m/ 5ft weight for 3 meter length NQ drill pipe 24 kg/ pcs Raw Material....