Impregnated Core Bits

Impregnated Core Bits

The main technical parameters of impregnated diamond core bits include diamond type, size, concentration and diamond grade, matrix hardness and crown shapes, etc. If users can make rational selections according to the rock formations, then they can get satified drilling performanace on various formations with different hardness. To avoid excessive bit wear, diamond tungsten carbide inserts are used on both sides of the waterway and the larger diamonds are used on the inside and outside.

 

IMPREGNATED BIT MATRIX SELECTION GUIDE
Rock Type Abrassiveness Rock Hardness Matrix Hardness Series No. Color
Clay, Shale, Siltstone, Gypsum Medium Soft HRC 50° NF1#  
Ash Stone, Coal, Argilite, Volcanics, Sandy Pebble Very High Soft HRC 48-50° NF1/NF2  
Sandstone, Sandy Shale, Lithoid Limestone, Limonite Sandstone Very High Medium Soft HRC 45-48° NF1#/NF2  
 Medium-hard Limestone, Medium-hard Shale, Medium-hard Ash Stone  High  Medium HRC 40-45°  NF3/NF4  
Marble, Hard Schist, Hard Steak Stone  Medium  Medium HRC 38-42° NF5/NF6/ NF7  
 Diabase, Andesite, Gneiss Medium Medium Hard HRC 38° NF6/NF7  
 Grandiorite, Limonite  Medium Medium Hard HRC 35-38° NF7/NF8  
 Granite, Basalt, Hard Streak Stone  Medium to Low Hard HRC 32-35°  NF8/NF9  
 Rhyolite, Crystauize Gneiss, Quartz Porphyry  Medium to Low Hard HRC 25-30° NF9/NF10  
Silicious Stone, Hard Sandstone Medium to Low  Extreme Hard HRC 20-25° NF11/NF12  
 Rhyolite, Dense Quartzite, Iron Stone  Low Ultra Hard HRC 10-20° NF12#  

 

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