| Grade |
Typical property
values |
Performance &
Applications |
Density
g/cm3 |
Bending
Strength
N/mm2 |
Hardness
HRA |
| YG4C |
14.9~15.2 |
1420 |
89.5 |
For geological
prospecting, coal mining, tipping of electric and air drilk; for
coal bed and other homogeneous rocks such as non-silicified shale,
skyline and rock salt, etc.; and for medium hard sandstone
limestone and interspersed soft and hard rocks. |
| YG6 |
14.6~15.0 |
1420 |
89.5 |
For coring crowns,
electric coal drill bits, coal cutting picks. oil cone bits and
scraping knife bits used in geological prospecting, coal mining
and oil well boring. |
| YG8 |
14.5~14.9 |
1470 |
89 |
For coring crowns,
electrical coal drill bits, coal cutting picks, cone drill bits and
scraping knife bits, used in geological prospecting coal mining
and oil well boring. |
| YG8C |
14.5~14.9 |
1720 |
88 |
For rotary rock drill
bits for medium hard and hard rock; and for coal cutting picks and
oil drill bits for cutting of honse-stone containing formations. |
| YG11C |
14.0~14.5 |
2060 |
86.5 |
For tipping of bits for
heavy rock drills and rotary hammer rock drills cutting hard rock
formations . e. g. , latent hole drills and deep-hole drills, rock
drills, etc. |
| YG13C |
14.0~14.3 |
2060 |
86.0 |
For oil cone drills, for
hard and medium hard rock and for tipping bit of rotary hammer
rock drills and heavy rock drills. |
| YG15 |
13.9~14.2 |
2060 |
87.0 |
Top strength and less
wear resistance, for bits of rotary hammer rock drills and heavy
rock drills , for hard and very hard rocks . |
| YG16C |
13.8~14.1 |
2250 |
84.0 |
For oil cone drill bits
for medium soft and medium hard rocks. |
