Indroduction to drilling bit jet nozzles for the hole is usually small aroud 0.25 inch in diameter
The part of the bit that includes a hole or opening for drilling fluid to exit.The hole is usually small (around 0.25 inch in diameter) and the pressure of the fluid inside the bit is usually high,leading to a high exit velocity through the nozzles that creates a high-velocity jet below the nozzles.This high-velocity jet of fluid cleans both the bit teeth and the bottom of the hole. The sizes of the nozzles are usually measured in 1/32-inch increments(although some are recorded in millimeters),are always reported in "thirty-seconds"of size(i.e.fractional denominators are not reduced),and usually range from 6/32 to 32/32.
Drilling fluids circulate through a drill string to nozzles at the bit and back to the surface via the system annulus.They provide three crucial functions to drilling:
- Cleaning of the cutting structure
- Cuttings removal from the hole bottom
- Efficient cuttings evacuation to the surface
| Common Alloy Grades, Ghysical Mechanical Properties And Recommended Application |
| Grade | WC% | Co/Ni % | Physical and mechanical properties | Grain size (μm) | Recommended application |
| Density (g/cm3) | TRS (N/mm2) | Hardness (HRA) |
| ZG01 | 100 | 0 | 15.3-15.5 | 1200 | 95.5 | 0.3 | Ultra-high hardness, high wear resistance, anti-corrosion, with certain anti-destructive ability |
| ZG04X | 96 | 4 | 15.0-15.2 | 1600 | 92.8 | 0.8-1.0 | Suitable for drawing die, non-ferrous metal wire drawing and wear-resistant parts |
| ZG06 | 94 | 6 | 14.8-15.1 | 2500 | 90.0 | 1.2 | Good abrasion resistance, good compression resistance, suitable for wear-resistant parts that resist abrasion and high pressure. |
| ZG06X | 94 | 6 | 14.8-15.1 | 2400 | 91.5 | 1.0 | Superio wear resistance,good comprehensive properties,suitable for making non-standard structure components with higher wear resistance. |
| ZG06A | 94 | 6 | 14.8-15.1 | 2150 | 92.5 | 0.6-0.8 |
| ZG08 | 92 | 8 | 14.6-14.9 | 2700 | 89.0 | 1.2-1.6 | Good general performance, used for general wear parts, molds, general tools, etc. |
| ZG10.2 | 90 | 10 | 14.3-14.6 | 3800 | 91.7 | 0.7 | Good general performance, suitable for casing and oil nozzle products |
| ZG11 | 89 | 11 | 14.3-14.7 | 2800 | 88.5 | 1.2-1.6 | Anti-wear, anti-erosion, good comprehensive mechanical strength, suitable for wear-resistant parts in the petroleum, chemical and mechanical industries. |
| ZG12X | 88 | 12 | 14.2-14.5 | 3000 | 89.5 | 1.0-1.2 | Anti-erosion, good comprehensive mechanical strength, suitable for impact-resistant wear-resistant parts, molds, and roller rings. |
| ZG15 | 85 | 15 | 13.8-14.2 | 3000 | 86.5 | 1.2-1.6 |
| ZG15X | 85 | 15 | 13.8-14.2 | 4500 | 89.0 | 0.7 | Excellent wear resistance and toughness,it is suitable for making integral stamping dies, anti-vibration toolholders, etc. |
| ZG20 | 80 | 20 | 13.4-13.8 | 3100 | 85.0 | 1.0 | Excellent wear resistance and toughness |
| ZN06 | 94 | 6 | 14.5-14.9 | 2000 | 90.0 | 1.2 | Non-magnetic alloy, suitable for sealing ring, non-magnetic wear-resistant parts and corrosion-resistant parts. |
| ZN09 | 91 | 9 | 14.3-14.6 | 2300 | 89.0 | 1.2-1.6 |
| ZN11 | 89 | 11 | 14.0-14.3 | 2600 | 88.0 | 1.2 |
